ORAL HYGIENE DEVICE

Abstract

An oral hygiene device, in particular a toothbrush, includes at least one application unit having a base body, further includes at least one handle unit, in particular a manual handle unit, having a base body, and including at least one coupling unit for releasably coupling the application unit to the handle unit, wherein the base body of the handle unit has a hardness and/or a density that is greater than a hardness and/or density of the base body of the application unit.

Claims

1. An oral hygiene device with at least one application unit having a base body, with at least one handle unit unit, having a base body, and with at least one coupling unit for releasably coupling the application unit to the handle unit, wherein the base body of the handle unit has a hardness and/or a density that is greater than a hardness and/or density of the base body of the application unit.

2. The oral hygiene device as claimed in claim 1, wherein the at least one coupling unit has at least one first coupling element which is formed integrally with the application unit.

3. The oral hygiene device as claimed in claim 2, wherein the at least one coupling unit has at least one second coupling element corresponding to the first coupling element and fixedly connected to the handle unit.

4. The oral hygiene device as claimed in claim 3, wherein the second coupling element of the coupling unit consists at least largely of plastic and is connected to the handle unit at least by form fit and/or substance bonding.

5. The oral hygiene device as claimed in claim 3, wherein the second coupling element of the coupling unit is formed integrally with the handle unit.

6. The oral hygiene device as claimed in claim 1, wherein the at least one coupling unit comprises at least one second coupling element which consists of a metallic material.

7. The oral hygiene device as claimed in claim 1, wherein at least the base body of the handle unit consists at least largely of a metallic material.

8. The oral hygiene device as claimed in claim 1, wherein at least the base body of the handle unit is produced in a diecasting process.

9. The oral hygiene device as claimed in claim 7, wherein the metallic material is formed from an aluminum alloy.

10. The oral hygiene device as claimed in claim 9, wherein the metallic material comprises between 1% and 13% silicon, between 0.5% and 2% iron, and maximum 5% copper.

11. An oral hygiene device as claimed in claim 1, with at least one application unit having a base body, with at least one handle unit, having a base body, and with at least one coupling unit for releasably coupling the application unit to the handle unit, wherein the base body of the handle unit delimits at least one recess which extends completely through the base body and which is completely surrounded by the base body in at least one plane.

12. The oral hygiene device as claimed in claim 11, wherein the handle unit has at least one thumb grip region wherein the recess is arranged at least partially in the thumb grip region.

13. The oral hygiene device as claimed in claim 11, wherein the base body of the handle unit delimits at least one further recess which is arranged behind the recess along a longitudinal axis of the handle unit, which extends completely through the base body and which is completely surrounded by the base body in at least one plane.

14. The oral hygiene device as claimed in claim 11, wherein the handle unit has a base form of at least approximate figure-of-eight shape, viewed at least in a plane parallel to a main extension plane of the handle unit.

15. An oral hygiene device as claimed in claim 1, with at least one application unit having a base body, with at least one handle unit, having a base body, and with at least one coupling unit for releasably coupling the application unit to the handle unit, wherein the base body of the handle unit is formed at least substantially rotationally symmetrical with respect to a longitudinal axis of the handle unit.

16. The oral hygiene device as claimed in claim 15, wherein the base body of the handle unit is formed at least substantially frustoconical.

17. A handle unit for an oral hygiene device as claimed in claim 1.

18. A method for production of a handle unit as claimed in claim 17, wherein at least one base body of the handle unit is made at least largely of a metallic material.

19. The method as claimed in claim 18, wherein at least the base body of the handle unit is produced in a diecasting process.

20. The method as claimed in claim 18, wherein in at least one later treatment step, a surface of at least the base body of the handle unit is anodized.

Description

DRAWINGS

[0100] Further advantages arise from the following description of the drawings. The drawings show eight exemplary embodiments of the invention. The drawings, description and claims contain numerous features in combination. The person skilled in the art will where applicable also consider these features individually and combine them into further sensible combinations.

[0101] The drawings show:

[0102] FIG. 1A a perspective, schematic illustration of an oral hygiene device according to the invention with an application unit, a handle unit, and a coupling unit;

[0103] FIG. 1B a perspective, schematic illustration of the handle unit of the oral hygiene device according to the invention;

[0104] FIG. 1C a front side of the oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0105] FIG. 1D a rear side of the oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0106] FIG. 1E a side of the oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0107] FIG. 1F a front side of the handle unit of the oral hygiene device according to the invention, in a schematic illustration;

[0108] FIG. 1G a rear side of the handle unit of the oral hygiene device according to the invention, in a schematic illustration;

[0109] FIG. 1H a side of the handle unit of the oral hygiene device according to the invention, in a schematic illustration;

[0110] FIG. 2A a perspective, schematic illustration of an alternative oral hygiene device according to the invention with an application unit, a handle unit, and a coupling unit;

[0111] FIG. 2B a perspective, schematic illustration of the handle unit of the alternative oral hygiene device according to the invention;

[0112] FIG. 2C a front side of the alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0113] FIG. 2D a rear side of the alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0114] FIG. 2E a side of the alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0115] FIG. 2F a front side of the handle unit of the alternative oral hygiene device according to the invention, in a schematic illustration;

[0116] FIG. 2G a rear side of the handle unit of the alternative oral hygiene device according to the invention, in a schematic illustration;

[0117] FIG. 2H a side of the handle unit of the alternative oral hygiene device according to the invention, in a schematic illustration;

[0118] FIG. 3A a perspective, schematic illustration of a further alternative oral hygiene device according to the invention with an application unit, a handle unit, and a coupling unit;

[0119] FIG. 3B a perspective, schematic illustration of the handle unit of the further alternative oral hygiene device according to the invention;

[0120] FIG. 3C a front side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0121] FIG. 3D a rear side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0122] FIG. 3E a side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0123] FIG. 3F a front side of the handle unit of the further alternative oral hygiene device according to the invention, in a schematic illustration;

[0124] FIG. 3G a rear side of the handle unit of the further alternative oral hygiene device according to the invention, in a schematic illustration;

[0125] FIG. 3H a side of the handle unit of the further alternative oral hygiene device according to the invention, in a schematic illustration;

[0126] FIG. 4A a perspective, schematic illustration of a further alternative oral hygiene device according to the invention with an application unit, a handle unit, and a coupling unit;

[0127] FIG. 4B a perspective, schematic illustration of the handle unit of the further alternative oral hygiene device according to the invention;

[0128] FIG. 4C a front side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0129] FIG. 4D a rear side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0130] FIG. 4E a side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0131] FIG. 4F a front side of the handle unit of the further alternative oral hygiene device according to the invention, in a schematic illustration;

[0132] FIG. 4G a rear side of the handle unit of the further alternative oral hygiene device according to the invention, in a schematic illustration;

[0133] FIG. 4H a side of the handle unit of the further alternative oral hygiene device according to the invention, in a schematic illustration;

[0134] FIG. 5A a perspective, schematic illustration of a further alternative oral hygiene device according to the invention with an application unit, a handle unit, and a coupling unit;

[0135] FIG. 5B a perspective, schematic illustration of the handle unit of the further alternative oral hygiene device according to the invention;

[0136] FIG. 5C a front side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0137] FIG. 5D a rear side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0138] FIG. 5E a side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0139] FIG. 5F a front side of the handle unit of the further alternative oral hygiene device according to the invention, in a schematic illustration;

[0140] FIG. 5G a rear side of the handle unit of the further alternative oral hygiene device according to the invention, in a schematic illustration;

[0141] FIG. 5H a side of the handle unit of the further alternative oral hygiene device according to the invention, in a schematic illustration;

[0142] FIG. 6A a perspective, schematic illustration of a further alternative oral hygiene device according to the invention with an application unit, a handle unit, and a coupling unit;

[0143] FIG. 6B a perspective, schematic illustration of the handle unit of the further alternative oral hygiene device according to the invention;

[0144] FIG. 6C a front side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0145] FIG. 6D a rear side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0146] FIG. 6E a side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit;

[0147] FIG. 6F a front side of the handle unit of the further alternative oral hygiene device according to the invention, in a schematic illustration;

[0148] FIG. 6G a rear side of the handle unit of the further alternative oral hygiene device according to the invention, in a schematic illustration;

[0149] FIG. 6H a side of the handle unit of the further alternative oral hygiene device according to the invention, in a schematic illustration;

[0150] FIG. 7A a perspective, schematic illustration of a further alternative oral hygiene device according to the invention with an application unit, a handle unit, and a coupling unit;

[0151] FIG. 7B a perspective, schematic illustration of the handle unit of the further alternative oral hygiene device according to the invention;

[0152] FIG. 7C a front side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0153] FIG. 7D a rear side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0154] FIG. 7E a side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0155] FIG. 7F a front side of the handle unit of the further alternative oral hygiene device according to the invention, in a schematic illustration;

[0156] FIG. 7G a rear side of the handle unit of the further alternative oral hygiene device according to the invention, in a schematic illustration;

[0157] FIG. 7H a side of the handle unit of the further alternative oral hygiene device according to the invention, in a schematic illustration;

[0158] FIG. 8A a perspective, schematic illustration of a further alternative oral hygiene device according to the invention with an application unit, a handle unit, and a coupling unit;

[0159] FIG. 8B a perspective, schematic illustration of the handle unit of the further alternative oral hygiene device according to the invention;

[0160] FIG. 8C a front side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0161] FIG. 8D a rear side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0162] FIG. 8E a side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0163] FIG. 8F a front side of the handle unit of the further alternative oral hygiene device according to the invention, in a schematic illustration;

[0164] FIG. 8G a rear side of the handle unit of the further alternative oral hygiene device according to the invention, in a schematic illustration;

[0165] FIG. 8H a side of the handle unit of the further alternative oral hygiene device according to the invention, in a schematic illustration;

[0166] FIG. 9A a perspective, schematic illustration of a further alternative oral hygiene device according to the invention with an application unit, a handle unit, and a coupling unit;

[0167] FIG. 9B a further perspective, schematic illustration of the further alternative oral hygiene device according to the invention with an application unit, a handle unit and a coupling unit;

[0168] FIG. 9C a front side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0169] FIG. 9D a rear side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0170] FIG. 9E a side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0171] FIG. 10A a perspective, schematic illustration of a further alternative oral hygiene device according to the invention with an application unit, a handle unit, and a coupling unit;

[0172] FIG. 10B a further perspective, schematic illustration of the further alternative oral hygiene device according to the invention with an application unit, a handle unit and a coupling unit;

[0173] FIG. 10C a front side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0174] FIG. 10D a rear side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0175] FIG. 10E a side of the further alternative oral hygiene device according to the invention with the application unit, handle unit and coupling unit, in a schematic illustration;

[0176] FIG. 11A an exploded illustration in a 3D view of a further alternative oral hygiene device according to the invention with an application unit, a handle unit, a coupling unit and a terminating element; and

[0177] FIG. 11B a perspective, schematic illustration of the further alternative oral hygiene device according to the invention with an application unit, a handle unit, a coupling unit and a terminating element.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0178] FIG. 1A shows a front side 34a of an oral hygiene device 10a in a schematic, perspective illustration. The oral hygiene device 10a in the present case is configured as a toothbrush. The oral hygiene device 10a is configured as a manual toothbrush. The oral hygiene device 10a is configured as an exchangeable head toothbrush. Also, the oral hygiene device 10a could be configured as a flosser, a single-tuft brush, an interdental cleaner, a tongue cleaner or similar. Furthermore, combined oral hygiene devices 10a are conceivable which combine at least two different functions, for example a toothbrush with tongue cleaner, a toothbrush with massage elements, or similar.

[0179] The oral hygiene device 10a has an application unit 12a. The oral hygiene device 10a also has a handle unit 14a. The handle unit 14a is formed by a manual handle unit 14a. The at least one handle unit 14a consists of a single material.

[0180] Reference is made below to FIGS. 1A to 1H which show various views of the oral hygiene device 10a and the handle unit 14a. Because of the different views, some elements are not shown in all figures, and accordingly not marked with reference signs in all figures. In general, the cleaning region 48a is shown schematically. FIG. 1B shows the front side 34a of the handle unit 14a in a perspective, schematic illustration. FIG. 1C shows a front side 34a of the oral hygiene device 10a in a schematic illustration. FIG. 1D shows a rear side 36a of the oral hygiene device 10a in a schematic illustration. FIG. 1E shows the side of the oral hygiene device 10a in a schematic illustration. FIG. 1F shows the front side 34a of the handle unit 14a of the oral hygiene device 10a in a top view. FIG. 1G shows the rear side 36a of the handle unit 14a of the oral hygiene device 10a in a schematic illustration. FIG. 1H shows a side of the handle unit 14a of the oral hygiene device 10a in a schematic illustration.

[0181] The oral hygiene device 10a has a longitudinal axis 30a, a vertical axis 38a, and a transverse axis 40a. The longitudinal axis 30a is arranged parallel to a main extension direction 42a of the oral hygiene device 10a. The longitudinal axis 30a furthermore corresponds to a longitudinal axis 30a of the handle unit 14a. If the oral hygiene device 10a is laid with its rear side 36a on a flat surface, so that the longitudinal axis 30a is arranged parallel to the surface, the vertical axis 38a is arranged perpendicularly to the longitudinal axis 30a and also perpendicularly to the surface and to the transverse axis 40a. The transverse axis 40a is perpendicular to the longitudinal axis 30a and perpendicular to the vertical axis 38a. In the present case, the oral hygiene device 10a has a length, in particular parallel to the longitudinal axis 30a of the oral hygiene device 10a, from 130 mm to 210 mm, and preferably from 180 mm to 200 mm. Furthermore, the oral hygiene device 10a has a maximum width, in particular parallel to the transverse axis 40a of the oral hygiene device 10a, from 10 mm to 25 mm, and preferably from 18 mm to 21 mm. Furthermore, the oral hygiene device 10a, in a neck region 44a of the application unit 12a, has a minimum width from 4 mm to 10 mm, preferably from 5 mm to 7 mm. Moreover, the oral hygiene device 10a without bristles has a height, in particular measured parallel to the vertical axis 38a, from 10 mm to 22 mm, and preferably from 12 mm to 18 mm. The handle unit 14a has a weight from 20 g to 40 g, preferably from 25 g to 35 g. The oral hygiene device 10a has a weight from 20 to 45 g, preferably from 28 g to 38 g. Preferably, a ratio of the weight of the handle unit 14a to a weight of the oral hygiene device 10a, i.e. with the handle unit 14a and the application unit 12a, is from 0.75 to 0.95, preferably from 0.85 to 0.93.

[0182] The application unit 12a is formed by a push-on part. The application unit 12a can be separated from the handle unit 14a, in particular without tools. The application unit 12a is formed for example by a push-on brush. In principle, however, other designs of application unit 12a which appear suitable to a person skilled in the art are conceivable. The application unit 12a has a base body 13a. The application unit 12a has a head region 46a. The head region 46a forms a brush head of the oral hygiene device 10a. In the present case, the head region 46a is configured as a toothbrush head. The head region 46a has in particular a base body configured as a bristle carrier.

[0183] A base body of the head region 46a is made completely from a hard component. It would however also be conceivable for the base body of the head region 46a to consist of a hard component and a soft component. The base body of the head region 46a forms a bristle carrier. The oral hygiene device 10a furthermore comprises a cleaning region 48a which is received by the head region 46a and which comprises a plurality of bristle bundles. At least one cutout is formed on the front side 34a of the head region 46a. The at least one cutout is provided to receive a bristle bundle. The head region 46a has a plurality of cutouts. The cutouts are formed by bristle holes. The bristles may be any suitable bristles which, as described above, may be punch-fitted, for example in the anchor punching process. In principle, the use of anchor-free processes is also conceivable. In this way, an anchor-free oral hygiene device 10a can be provided, and hence an oral hygiene device 10a without metal since the anchor wire may be omitted. In the case of certain anchor-free processes, a recess is provided in the head region 46a which serves to receive a plate parallel to the handle unit 14a. The plate is produced in particular by means of an injection molding process, wherein the bristles are fitted to the plate before fixing. The plate is intended to be anchored in the recess of the head region 46a, in particular by means of welding. The bristle bundles may differ with respect to their length, composition, number of bristles, bristle material, color, surface structuring and similar. Also, angles at which the bristles and/or bristle bundles stand relative to one another or to a surface of the base body of the head region 46a may vary between bristles and/or between bristle bundles. In the present case, the application unit 12a also comprises the at least one neck region 44a, which in particular connects the head region 46a to the handle unit 14a. The neck region 44a forms a neck. The base body 13a of the application unit 12a comprises the head region 46a and the neck region 44a.

[0184] The application unit 12a is arranged on the top side of the oral hygiene device 10a. The application unit 12a forms a topmost point of the oral hygiene device 10a. The application unit 12a is for example made completely from a hard component. It would however also be conceivable for the application unit 12a to consist partially of a soft component and partially of a hard component. With respect to suitable soft and/or hard components, reference is made to the description above. In principle, the application unit 12a may comprise at least one tongue cleaner element. The tongue cleaner element may in particular comprise studs and/or ribs. Preferably, the tongue cleaner element is arranged on the rear side of the head region 46a, in particular this may be arranged on a ring of the soft component and/or on an island of a hard component.

[0185] The neck region 44a forms a transition between the application unit 12a and the handle unit 14a. The neck region 44a is made of the hard component. The neck region 44a is formed integrally with the head region 46a.

[0186] The handle unit 14a comprises a base body 16a. The handle unit 14a has at least one gripping face 50a which forms a surface 32a of the base body 16a. The gripping face 50a runs on the front side 34a from an end of the handle unit 14a facing the neck region 44a to the lower end of the oral hygiene device 10a on the underside. The base body 16a of the handle unit 14a delimits at least one opening 24a. The opening 24a extends completely through the base body 16a and is surrounded by the base body 16a in at least one plane. The opening 24a is completely surrounded by the base body 16a in a plane parallel to the main extension plane of the handle unit 14a. The opening 24a is completely surrounded by the base body 16a in the main extension plane of the handle unit 14a. The base body 16a has a first loop 52a which extends around the opening 24a. The opening 24a has a drop-like and/or lenticular cross-sectional form in the main extension plane of the handle unit 14a. The opening 24a is in particular oriented along the longitudinal axis 30a of the handle unit 14a. The first loop 52a of the base body 16a forms two lateral longitudinal webs 54a, 54a′, which are connected at a front end and a rear end of the opening 24a along the longitudinal axis 30a, and surround the opening 24a. The first loop 52a is closed. In particular, there are no open ends, such as for example fork-like designs. The first loop 52a has for example an at least approximately diamond-shaped cross-section in a plane perpendicular to the longitudinal axis 30a. The longitudinal webs 54a, 54a′ of the first loop 52a have a diamond-shaped cross-section. The longitudinal webs 54a, 54a′ of the first loop 52a are rounded or radiused on the outside, i.e. outside the opening 24a. Furthermore, the longitudinal webs 54a, 54a′ of the first loop 52a are approximately angular on the inside, i.e. facing the opening 24a, in particular they have sharp edges. The cross-sections of the longitudinal webs 54a, 54a′ each have four sides, of which at least one is concavely curved and at least one is convexly curved. Preferably, at least one of the sides of the cross-sections of the longitudinal webs 54a, 54a′ facing the opening 24a on the front side 34a is concavely curved. Furthermore, preferably the outer sides, i.e. in particular, the sides of the cross-sections of the longitudinal webs 54a, 54a′ facing away from the opening 24a, are convexly curved. The cross-sections of the longitudinal webs 54, 54a′ may change at least partially over a longitudinal course, in particular with respect to a dimensioning of the cross-section. The opening 24a has a width from 4 mm to 9 mm, preferably from 5 mm to 7.5 mm. The opening 24a has a length from 10 mm to 60 mm, preferably from 25 mm to 50 mm. The opening 24a may furthermore perform further functions. For example, it would be conceivable that the oral hygiene device 10a could be suspended via the opening 24a, for example on a hook.

[0187] The base body 16a of the handle unit 14a furthermore delimits a further opening 28a which is arranged behind the opening 24a along the longitudinal axis 30a of the handle unit 14a. The further opening 28a is arranged on a side of the opening 24a facing away from the application unit 12a. The opening 24a and the further opening 28a have no direct connection. The opening 24a and the further opening 28a are separated by the base body 16a of the handle unit 14a. The further opening 28a extends completely through the base body 16a and is completely surrounded by the base body 16a in at least one plane. The further opening 28a is completely surrounded by the base body 16a in a plane parallel to a main extension plane of the handle unit 14a. The further opening 28a is completely surrounded by the base body 16a in the main extension plane of the handle unit 14a. The base body 16a has a second loop 56a which extends around the further opening 28a. The further opening 28a has a drop-like and/or lenticular cross-sectional form in the main extension plane of the handle unit 14a. The further opening 28a is in particular oriented along the longitudinal axis 30a of the handle unit 14a. The second loop 56a of the base body 16a forms two lateral longitudinal webs 58a, 58a′ which are connected at a front end and a rear end of the further opening 28a along the longitudinal axis 30a, and surround the further opening 28a. Between the opening 24a and the further opening 28a, the first loop 52a and the second loop 56a in particular form a node point at which the loops 52a, 56a run into one another. At the node point, a left longitudinal web 54a of the first loop 52a transforms into the right longitudinal web 58a′ of the second loop 56a. Furthermore, at the node point, a right longitudinal web 54a′ of the first loop 52a transforms into the left longitudinal web 58a of the second loop 56a. The second loop 56a is closed. The second loop 56a has for example an at least approximately diamond-shaped cross-section in a plane perpendicular to the longitudinal axis 30a. The longitudinal webs 58a, 58a′ of the second loop 52a have a diamond-like cross-section. The longitudinal webs 58a, 58a′ of the second loop 56a are formed rounded or radiused on the outside, i.e. outside the further opening 28a. Furthermore, the longitudinal webs 88a, 58a′ of the second loop 56a are approximately angular on the inside, i.e. facing the further opening 28a, in particular they have a sharp edge. The cross-sections of the longitudinal webs 58a, 58a′ each have four sides, of which at least one is concavely curved and at least one is convexly curved. Preferably, at least one of the sides of the cross-sections of the longitudinal webs 58a, 58a′ facing the further opening 28a on the front side 34a is concavely curved. Furthermore, preferably the outer sides, i.e. in particular the sides of the cross-sections of the longitudinal webs 58a, 58a′ facing away from the further opening 28a, are convexly curved. The cross-sections of the longitudinal webs 58a, 58a′ may change at least partially over a longitudinal course, in particular with respect to a dimensioning of the cross-section. The further opening 28a has a width from 4 mm to 9 mm, preferably from 5 mm to 7.5 mm. The further opening 28a has a length from 10 mm to 60 mm, preferably from 25 mm to 50 mm. The further opening 28a may furthermore perform further functions. For example, it would be conceivable that the oral hygiene device 10a could be suspended via the further opening 28a, for example on a hook.

[0188] Viewed in a plane parallel to a main extension plane of the handle unit 14a, the handle unit 14a has an at least approximately figure-of-eight shaped base form. Viewed in a plane parallel to a main extension plane of the handle unit 14a, the handle unit 14a has at least approximately the form of an infinity symbol. The base body 16a of the handle unit 14a, together with the loops 52a, 56a, forms a figure-of-eight. The first loop 52 is smaller, in particular narrower and shorter, than the second loop 56a. Furthermore, the opening 24a is smaller than the further opening 28a. The position of the node point relative to the total length of the handle unit 14a lies between 60 mm and 80 mm, preferably between 65 mm and 75 mm, measured from the free end, along the longitudinal axis 30a of the handle unit 14a. The position of the node point relative to the total length of the handle unit 14a, as a percentage of the total length of the handle unit 14a, lies between 35% and 55%, preferably between 40% and 50%, measured from the free end. Preferably, the cross-sections of the loops 52a, 56a of the base body 16a of the handle unit 14a are at least similar, wherein the loops 52a, 56a, may for example transform into a further shape at their ends or at the node point.

[0189] The handle unit 14a has a thumb grip region 26a. The handle unit 14a furthermore has a palm grip region 60a. The opening 24a is at least partially arranged in the thumb grip region 26a. The further opening 28a is at least partially arranged in the palm grip region 60a. The base body 16a of the handle unit 14a forms a depression in the thumb grip region 26a towards the opening 24a. The depression is arranged at least on a front side 34a of the base body 16a of the handle unit 14a. The depression is formed concave. The depression is formed by the first loop 52a.

[0190] The loops 52a, 56a of the handle unit 14a furthermore have a width from 4 mm to 8 mm, preferably from 5 mm to 7 mm. Furthermore, the loops 52a, 56a of the handle unit 14a have a height from 4 mm to 20 mm, preferably from 6 mm to 15 mm. The base body 16a or the loops 52a, 56a of the handle unit 14a form a course in the longitudinal direction. The base body 16a or the loops 52a, 56a have a minimum height of 7.6 mm and a maximum height of 12.9 mm along the course. In a side view, the handle unit 14a has a bent, in particular curved longitudinal form. On the rear side 36a, the handle unit 14a has in particular support points at the free end and at an end facing the application unit 12a, for laying down on a surface. The handle unit 14a has a weight from 20 g to 40 g, preferably from 25 g to 35 g. Furthermore, the handle unit 14a forms a thickening at an end facing the application unit 12a, so as to give an optimum transition from the slender design of the handle unit 14a to the application unit 12a.

[0191] The base body 16a of the handle unit 14a has a hardness and density which are greater than a hardness and density of the base body 13a of the application unit 12a. The base body 13a of the application unit 12a consists of plastic and has a density from 800 kg/m.sup.3 to 1600 kg/m.sup.3. A ratio to the density of the handle unit 16a amounts to between 0.2 and 0.75, preferably between 0.35 and 0.6. The base body 16a of the handle unit 14a has a density from 2000 kg/m.sup.3 to 3500 kg/m.sup.3, preferably from 2400 kg/m.sup.3 to 3000 kg/m.sup.3.

[0192] The base body 16a of the handle unit 14a consists largely of a metallic material. The base body 16a of the handle unit 14a consists completely of a metallic material. The handle unit 14a consists completely of a metallic material. The metallic material is formed by an aluminum alloy. The metallic material comprises between 1% and 13% silicon, between 0.5% and 2% iron, and maximum 5% copper. The metallic material comprises maximum 13% magnesium. The metallic material comprises maximum 1% nickel. The metallic material comprises maximum 5% zinc. The aluminum alloy may for example be of a first type comprising in particular 5% to 10% silicon, less than 2% iron, 2% to 5% copper, less than 1% magnesium, less than 1% nickel, less than 5% zinc and/or less than 1% tin. The aluminum alloy of the first type in particular has a density from 2000 kg/m.sup.3 to 3500 kg/m.sup.3, preferably from 2400 kg/m.sup.3 to 3000 kg/m.sup.3. Alternatively, the aluminum alloy may for example be of a second type, in particular comprising 8% to 13% silicon, less than 1.5% iron, 1% to 4% copper, less than 1% magnesium, less than 1% nickel, less than 2% zinc, less than 1% tin, less than 0.5% lead and/or less than 0.2% titanium. The aluminum alloy of the second type in particular has a density from 2000 kg/m.sup.3 to 3500 kg/m.sup.3, preferably from 2400 kg/m.sup.3 to 3000 kg/m.sup.3. Alternatively, the aluminum alloy may for example be of a third type, in particular comprising less than 1.5% silicon, less than 1.5% iron, less than 1% copper, less than 1% magnesium, less than 1% zinc and/or less than 1% titanium. The aluminum alloy of the third type has in particular a density from 2000 kg/m.sup.3 to 3500 kg/m.sup.3, preferably from 2400 kg/m.sup.3 to 3000 kg/m.sup.3. Alternatively, the aluminum alloy may for example be of a fourth type, in particular comprising 1.5% to 3.5% silicon, less than 1.5% iron, less than 1% copper, less than 1% manganese, between 6% and 13% magnesium, less than 1% nickel, less than 1% zinc, less than 1% tin, less than 0.5% lead and/or less than 0.5% titanium. The aluminum alloy of the fourth type has in particular a density from 2000 kg/m.sup.3 to 3500 kg/m.sup.3, preferably from 2400 kg/m.sup.3 to 3000 kg/m.sup.3. Alternatively, the aluminum alloy may for example be of a fifth type, comprising in particular 1% to 3% silicon, less than 1% iron, less than 1% copper, less than 1% manganese, between 3% and 8% magnesium, less than 1% zinc and/or less than 0.5% titanium. The aluminum alloy of the fifth type has in particular a density from 2000 kg/m.sup.3 to 3500 kg/m.sup.3, preferably from 2400 kg/m.sup.3 to 3000 kg/m.sup.3. Alternatively, the aluminum alloy may for example be of a sixth type. The aluminum alloy of the sixth type has in particular a density from 2000 kg/m.sup.3 to 3500 kg/m.sup.3, preferably from 2400 kg/m.sup.3 to 3000 kg/m.sup.3.

[0193] At least the base body 16a of the handle unit 14a is produced in a diecasting process. The handle unit 14a is produced in a diecasting process. The handle unit 14a is produced in an aluminum diecasting process. In principle however, other production methods which appear suitable to a person skilled in the art are conceivable, as has already been explained above.

[0194] Furthermore, the oral hygiene device 10a has a coupling unit 18a for releasable coupling of the application unit 12a to the handle unit 14a. The coupling unit 18a serves for exchange of the application unit 12a on the handle unit 14a. The coupling unit 18a has a first coupling element 20a. Furthermore, the coupling unit 18a has a second coupling element 22a corresponding to the first coupling element 20a. The first coupling element 20a forms an interface receiver, while the second coupling element 22a forms an interface protrusion. The first coupling element 20a delimits an interface receiver. The first coupling element 20a is formed integrally with the application unit 12a. The first coupling element 20a is formed integrally with the base body 13a of the application unit 12a. The first coupling element 20a is arranged on a side of the application unit 12a facing away from the head region 46a. The first coupling element 20a is arranged at an end of the neck region 44a facing away from the head region 46a. The first coupling element 20a is arranged in the neck region 44a of the application unit 12a. The coupling unit 18a is provided for a rotationally fixed coupling of the first coupling element 20a to the second coupling element 22a. The second coupling element 22a is firmly connected to the handle unit 14a. The second coupling element 22a of the coupling unit 18a is formed integrally with the handle unit 14a. The second coupling element 22a is formed by an interface protrusion which protrudes at least partially out of the base body 16a of the handle unit 14a. The second coupling element 22a is arranged on a side of the handle unit 14a facing the application unit 12a. The second coupling element 22a is arranged at an end of the handle unit 14a facing away from the lower end of the handle unit 14a. The second coupling element 22a forms a part of the handle unit 14a. The second coupling element 22a consists of a metallic material.

[0195] The second coupling element 22a forms a plug-like coupling structure 86a. The second coupling element 22a is divided into three stages 62a, 64a, 66a; namely a first stage 62a at a free end, an adjacent second stage 64a, and a terminating third stage 66a which transforms into an oblique stop face 68a of the handle unit 14a. The first stage 62a is divided into an upper part element 70a and a lower part element 72a. The upper part element 70a of the first stage 62a is at least partially cylindrical or approximately cylindrical, and rises as a ramp in the direction of the second stage 64a. The upper part element 70a is wedge-shaped. Around half-way along the first stage 62a, an at least approximately rectangular groove 74a begins, which also continues over the entire second stage 64a up to the stop at the third stage 66a. The lower part element 72a of the first stage 62a is formed by a wall-like web, which continues from the first stage 62a over the entire second stage 64a up to a stop on the third stage 66a. The lower part element 72a is formed chamfered at its free end, or the wall-like web is chamfered. The rectangular groove 74a on the top side of the upper part element 76a of the second stage 64a, and the web of the lower part element 72a of the first stage 62a, serve in particular for a secure and twist-free insertion into the corresponding socket-like first coupling element 20a of the coupling unit 18a. The second stage 64a has an upper part element 76a. The upper part element 76a has a semicylindrical form with a center axis which is parallel, in particular coaxial, to the longitudinal axis 30a of the handle unit 14a. A diameter of the upper part element 76a of the second stage 64a is greater than a diameter of the upper part element 70a of the first stage 62a. The third stage 66a is divided into an upper part element 78a and a lower part element 80a. The upper part element 78a of the third stage 66a has a semicylindrical form with a center axis which is parallel, in particular coaxial, to the longitudinal axis 30a of the handle unit 14a. The lower part element 80a of the third stage 66a has a semicylindrical form with a center axis which is parallel, in particular coaxial, to the longitudinal axis 30a of the handle unit 14a. A diameter of the upper part element 78a of the third stage 66a is smaller than a diameter of the lower part element 80a of the third stage 66a. Furthermore, the third stage 66a has a cam 82a at the lower part element 80a. The cam 82a is formed by a latching cam which is provided to latch into a corresponding latching recess 84a of the first coupling element 20a. The cam 82a has an at least approximately keyhole-shaped contour. The cam 82a has a rectangular stem and a round crown. This design ensures a particularly good latching with a contra-designed latching recess 84a of the first coupling element 20a. The cam 82a protrudes out of the lower part element 80a. The cam 82a is furthermore exposed. Exposure is in particular created during production. For exposure, a rectangular depression is made in the lower part element 80a around the cam 82a. The first stage 62a is longer than the second stage 64a and approximately the same length as the third stage 66a on its underside. The third stage 66a on its underside is correspondingly longer than the second stage 64a, but on its top side is slightly shorter than the second stage 64a.

[0196] The first coupling element 20a of the coupling unit 18a is at least approximately designed as a counterpart to the second coupling element 22a. The first coupling element 20a is divided into three stages, namely a first stage on the inside, a second stage, and a third stage at the free end. The first stage has an upper partial recess and a lower partial recess, wherein the partial recesses are each formed cylindrical and transform into one another. The second stage has a cylindrical recess. Furthermore, the first coupling element 20a has two webs which extend over the first and second stages respectively and protrude into the recesses of the first and second stages. The webs extend on opposite sides along a longitudinal axis 30a of the oral hygiene device 10a. A diameter of the upper and lower partial recesses of the first stage is in each case smaller than a diameter of the recess of the second stage. The third stage has a cylindrical recess. The diameter of the cylindrical recess of the third stage is greater than a diameter of the cylindrical recess of the second stage.

[0197] In a method for production of the handle unit 14a, at least the base body 16a of the handle unit 14a is made at least largely from a metallic material. The entire handle unit 14a is made from a metallic material. The handle unit 14a is made from an aluminum alloy. Furthermore, the at least one base body 16a of the handle unit 14a is produced in a diecasting process. The entire handle unit 14a is produced in a diecasting process. The handle unit 14a is produced in an aluminum diecasting process. In the diecasting process, the metallic material is pressed into a diecasting mold for the handle unit 14a under high pressure and with a high mold filling speed. The second coupling element 22a is produced with the handle unit 14a. The second coupling element 22a is produced with the handle unit 14a in the diecasting process. After production of the handle unit 14a, a further treatment step occurs. In the further treatment step, a surface 32a of at least the base body 16a of the handle unit 14a is anodized. A complete surface 32a of the handle unit 14a and at least part of the second coupling element 22a are anodized in the later treatment step. During anodizing, an oxidic protective layer is created on the alloy. In particular, an anodic oxidation takes place. In particular, the protective layer is formed by conversion of the top metal layer into an oxide and/or hydroxide. In particular, an oxide layer is created with a layer thickness from 5 μm to 30 μm, preferably from 15 μm to 25 μm. The base body 16a of the handle unit 14a may be colored in particular during or after anodizing in the later treatment step. In principle, however, as already stated above, other later treatment steps are conceivable which appear suitable to the person skilled in the art.

[0198] FIGS. 2A to 8H show five further exemplary embodiments of the invention. The descriptions below are substantially restricted to the differences between the exemplary embodiments, wherein with respect to the same components, features and functions, reference may be made to the description of the other exemplary embodiments, in particular of FIGS. 1A to 1H. To distinguish the exemplary embodiments, the suffix letter a in the reference signs of the exemplary embodiment of FIGS. 1A to 1H has been replaced by the suffix letters b to h in the reference signs of the exemplary embodiments of FIGS. 2A to 7H. With respect to components with the same designation, in particular with respect to components with the same reference signs, in principle reference may be made to the drawings and/or the description of the other exemplary embodiments, in particular of FIGS. 1A to 1H.

[0199] FIGS. 2A to 2H show an oral hygiene device 10b in various illustrations. The oral hygiene device 10b is configured as an exchangeable head toothbrush. The oral hygiene device 10b has an application unit 12b. The oral hygiene device 10b furthermore has a handle unit 14b. The application unit 12b is formed by a push-on part. The application unit 12b has a base body 13b. The application unit 12b can be detached from the handle unit 14b, in particular without tools. Furthermore, the oral hygiene device 10b comprises a coupling unit 18b for releasable coupling of the application unit 12b to the handle unit 14b. In general, the cleaning region 48b of the application unit 12b is illustrated schematically.

[0200] The handle unit 14b has a base body 16b. The base body 16b of the handle unit 14b delimits at least one opening 24b. The opening 24b extends completely through the base body 16b and is surrounded by the base body 16b in at least one plane. The opening 24b is completely surrounded by the base body 16b in a plane parallel to the main extension plane of the handle unit 14b. The opening 24b is completely surrounded by the base body 16b in the main extension plane of the handle unit 14b. The base body 16b has a loop 52b which extends around the opening 24b. The opening 24b has a figure-of-eight shaped cross-sectional form in the main extension plane of the handle unit 14b. The opening 24b is in particular oriented along the longitudinal axis 30b of the handle unit 14b. The loop 52b of the base body 16b forms two lateral longitudinal webs 54b, 54b′, which are connected at a front end and a rear end of the opening 24b along the longitudinal axis 30b, and surround the opening 24b. The loop 52b is closed. In particular, there are no open ends, such as for example fork-like designs. The loop 52b has for example an at least approximately diamond-shaped cross-section in a plane perpendicular to the longitudinal axis 30b. The longitudinal webs 54b, 54b′ of the loop 52b have a diamond-shaped cross-section. The longitudinal webs 54b, 54b′ of the loop 52b are rounded or radiused on the outside, i.e. outside the opening 24b. Furthermore, the longitudinal webs 54b, 54b′ of the loop 52b are approximately angular on the inside, i.e. facing the opening 24b, in particular they have sharp edges. The cross-sections of the longitudinal webs 54b, 54b′ each have four sides, of which at least one is concavely curved and at least one is convexly curved. Preferably, at least one of the sides of the cross-sections of the longitudinal webs 54b, 54b′ facing the opening 24b on the front side 34b is concavely curved. Furthermore, preferably the outer sides, i.e. in particular the sides of the cross-sections of the longitudinal webs 54b, 54b′ facing away from the opening 24b, are convexly curved. The cross-sections of the longitudinal webs 54b, 54b′ may change at least partially over a longitudinal course, in particular with respect to the dimensioning of the cross-section.

[0201] The handle unit 14b has a thumb grip region 26b. The handle unit 14b furthermore has a palm grip region 60b. The opening 24b is arranged at least partially in the thumb grip region 26b and in the palm grip region 60b. The base body 16b and the opening 24b form a constriction between the thumb grip region 26b and the palm grip region 60b. The constriction is used, inter alia, to set back the thumb grip region 26b. The thumb grip region 26b does not however take up the complete part of the opening 24b in front of the constriction, but substantially only the foremost part of the opening 24b.

[0202] FIGS. 3A to 3H show an oral hygiene device 10c in various illustrations. The oral hygiene device 10c is configured as an exchangeable head toothbrush. The oral hygiene device 10c has an application unit 12c. The oral hygiene device 10c furthermore has a handle unit 14c. The application unit 12c is formed by a push-on part. The application unit 12c has a base body 13c. The application unit 12c can be detached from the handle unit 14c, in particular without tools. Furthermore, the oral hygiene device 10c comprises a coupling unit 18c for releasable coupling of the application unit 12c to the handle unit 14c. In general, the cleaning region 48c of the application unit 12c is illustrated schematically.

[0203] The handle unit 14c has as an outer form of an at least approximate figure-of-eight shape when viewed in a plane parallel to the main extension plane of the handle unit 14c. The handle unit 14c has a base body 16c. The base body 16c is formed at least substantially flat on a front side 34c. On a rear side 36c, the base body 16c has a recess 24c. The recess 24c is formed by a depression. The recess 24c is at least partially surrounded by the base body 16c in a plane parallel to the main extension plane of the handle unit 14c. The recess 24c has a figure-of-eight shaped cross-section in the main extension plane of the handle unit 14c. The handle unit 14c has a thumb grip region 26c. The handle unit 14c furthermore has a palm grip region 60c. The recess 24c is arranged at least partially on the back of the thumb grip region 26c and the palm grip region 60c. The base body 16c and the recess 24c form a constriction between the thumb grip region 26c and the palm grip region 60c. The constriction is used, inter alia, to set back the thumb grip region 26c.

[0204] FIGS. 4A to 4H show an oral hygiene device 10d in various illustrations. The oral hygiene device 10d is configured as an exchangeable head toothbrush. The oral hygiene device 10d has an application unit 12d. The oral hygiene device 10d furthermore has a handle unit 14d. The application unit 12d is formed by a push-on part. The application unit 12d has a base body 13d. The application unit 12d can be detached from the handle unit 14d, in particular without tools. Furthermore, the oral hygiene device 10d comprises a coupling unit 18d for releasable coupling of the application unit 12d to the handle unit 14d. In general, the cleaning region 48d of the application unit 12d is illustrated schematically.

[0205] The coupling unit 18d has a first coupling element 20d. Furthermore, the coupling unit 18d has a second coupling element 22d corresponding to the first coupling element 20d. The first coupling element 20d forms an interface receiver, while the second coupling element 22d forms an interface protrusion. The first coupling element 20d delimits an interface receiver. The first coupling element 20d is formed integrally with the application unit 12d. The first coupling element 20d is arranged on a side of the application unit 12d facing away from the head region 46d.

[0206] The second coupling element 22d is formed by a separate component. The second coupling element 22d of the coupling unit 18d consists at least largely of a plastic. The second coupling element 22d is in particular produced in an injection molding process. The second coupling element 22d consists completely of a plastic. In principle however, it would also be conceivable for the second coupling element 22d to consist of another material which appears suitable to a person skilled in the art. The second coupling element 22d has a plug-like coupling structure 86d. The second coupling element 22d also has a base body 88d on which the plug-like coupling structure 86d is arranged. The second coupling element 22d is formed of one piece. Furthermore, the second coupling element 22d has an interface (not visible further) for coupling to the handle unit 14d. This interface is arranged on a side of the base body 88d facing the plug-like coupling structure 86d. The second coupling element 22d is connected to the handle unit 14d at least by form fit and/or substance bonding. The second coupling element 22d is connected to the handle unit 14d for example by means of a push fit and/or adhesive connection. The second coupling element 22d is in particular formed so as to be detachable from the handle unit 14d for disposal. The handle unit 14d has an interface for fixed connection to the second coupling element 22d. The interface is preferably configured as a blind hole. The handle unit 14d, at an end facing the application unit 12d, has a recess (not visible further) in which the second coupling element 22d is secured. On production of the oral hygiene device 10d, the handle unit 14d and the second coupling element 22d are produced separately and assembled afterwards. Assembly takes place for example by means of a catch connection. However, as already stated above, other assembly means are conceivable which appear suitable to a person skilled in the art. The connection between the second coupling element 22d and the handle unit 14d may in particular be configured so as to be fixed and inseparable, or exchangeable. Differently colored second coupling elements 22d may bring the necessary distinction, in particular with a uniform handle color.

[0207] FIGS. 5A to 5H show an oral hygiene device 10e in various illustrations. The oral hygiene device 10e is configured as an exchangeable head toothbrush. The oral hygiene device 10e has an application unit 12e. The oral hygiene device 10e furthermore has a handle unit 14e. The application unit 12e is formed by a push-on part. The application unit 12e has a base body 13e. The application unit 12e can be detached from the handle unit 14d, in particular without tools. Furthermore, the oral hygiene device 10e comprises a coupling unit 18e for releasable coupling of the application unit 12e to the handle unit 14e. In general, the cleaning region 48e of the application unit 12e is illustrated schematically.

[0208] The handle unit 14e has a base body 16e. The base body 16e of the handle unit 14e is formed at least substantially rotationally symmetrical with respect to a longitudinal axis 30e of the handle unit 14e. The base body 16e of the handle unit 14e is formed rotationally symmetrical with respect to the longitudinal axis 30e of the handle unit 14e. The base body 16e of the handle unit 14e is formed at least substantially frustoconical. On a side facing the coupling unit 18e, the base body 16e has a greater diameter than on a side facing away from the coupling unit 18e. A free end of the base body 16e of the handle unit 14e facing away from the coupling unit 18e is rounded. An end of the base body 16e of the handle unit 14e facing the coupling unit 18e is furthermore chamfered. An end face of the base body 16e of the handle unit 14e facing the coupling unit 18e has an angle of at least approximately 45° to the longitudinal axis 30e of the handle unit 14e. The chamfer of the base body 16e of the handle unit 14e runs opposite to a chamfer of the application unit 12e. A maximum diameter of the handle unit 14e is between 10 mm and 20 mm, preferably between 12 mm and 16 mm.

[0209] The coupling unit 18e has a first coupling element 20e. Furthermore, the coupling unit 18e has a second coupling element 22e corresponding to the first coupling element 20e. The first coupling element 20e forms an interface receiver, while the second coupling element 22e forms an interface protrusion. The first coupling element 20e delimits an interface receiver. The first coupling element 20e is formed integrally with the application unit 12e. The first coupling element 20e is arranged on a side of the application unit 12e facing away from the head region 46e.

[0210] The second coupling element 22e is formed by a separate component. The second coupling element 22e of the coupling unit 18e consists at least largely of a plastic. In principle however, it would also be conceivable for the second coupling element 22e to consist of another material which appears suitable to a person skilled in the art. The second coupling element 22e has a plug-like coupling structure 86e. The second coupling element 22e also has a base body 88e on which the plug-like coupling structure 86e is arranged. The base body 88e is arranged at least partially in the thumb grip region 26e. The base body 88e of the second coupling element 22e forms a depression in the thumb grip region 26e. The depression is arranged at least on a front side 34e of the base body 88e. The depression is formed concave. The base body 88e may also have protrusions to improve grip in the thumb grip region 26e. The base body 88e has for example three linear protrusions. The second coupling element 22e is formed as one piece. Furthermore, the second coupling element 22e has an interface (not visible further) for coupling with the handle unit 14e. This interface is arranged on a side of the base body 88e facing away from the plug-like coupling structure 86e. The second coupling element 22e is connected to the handle unit 14e at least by form fit and/or substance bonding. The second coupling element 22e is connected to the handle unit 14e for example by means of a push fit and/or adhesive connection. The second coupling element 22e is formed so as to be detachable from the handle unit 14e for disposal. The handle unit 14e has an interface for firm connection to the second coupling element 22e. The interface is preferably configured as a blind hole. The handle unit 14e, at an end facing the application unit 12e, has a recess (not visible further) in which the second coupling element 22e is secured. The recess may for example be made in the form of a blind hole in the longitudinal direction by turning and/or drilling. On production of the oral hygiene device 10e, the handle unit 14e and the second coupling element 22e are produced separately and assembled afterwards. Assembly takes place for example by means of a catch connection. However, as already stated above, other assembly means are conceivable which appear suitable to a person skilled in the art. The connection between the second coupling element 22e and the handle unit 14e may in particular be configured so as to be fixed and inseparable, or exchangeable. Differently colored second coupling elements 22e may bring the necessary distinction, in particular with a uniform handle color. By chamfering the base body 16e of the handle unit 14e, and chamfering the coupling unit 18e, assembly of the base body 88e to the handle unit 14e is clearly defined because of the orientation.

[0211] FIGS. 6A to 6H show an oral hygiene device 10f in various illustrations. The oral hygiene device 10f is configured as an exchangeable head toothbrush. The oral hygiene device 10f has an application unit 12f. The oral hygiene device 10f furthermore has a handle unit 14f. The application unit 12f is formed by a push-on part. The application unit 12f has a base body 13f. The application unit 12f can be detached from the handle unit 14f, in particular without tools. Furthermore, the oral hygiene device 10f comprises a coupling unit 18f for releasable coupling of the application unit 12f to the handle unit 14f. In general, the cleaning region 48f of the application unit 12f is illustrated schematically.

[0212] The handle unit 14f has a base body 16f. The base body 16f of the handle unit 14f is formed at least substantially rotationally symmetrical with respect to a longitudinal axis 30f of the handle unit 14f. The base body 16f of the handle unit 14f is formed rotationally symmetrical with respect to the longitudinal axis 30f of the handle unit 14f. The base body 16f of the handle unit 14f is formed with a convex bulge in the palm grip region 60f. Furthermore, the base body 16f of the handle unit 14f is formed waisted between the thumb grip region 26f and the palm grip region 60f. The base body 16f has a greatest diameter in the palm grip region 60f. A free end of the base body 16f of the handle unit 14f facing away from the coupling unit 18f is formed rounded. A minimum diameter of the handle unit 14f in the waisting is from 7 mm to 15 mm, preferably from 9 mm to 12 mm. A maximum diameter of the handle unit 14f is between 10 mm and 20 mm, preferably from 12 mm to 16 mm. An end of the base body 16f of the handle unit 14f facing the coupling unit 18f is formed straight.

[0213] The coupling unit 18f has a first coupling element 20f. Furthermore, the coupling unit 18f has a second coupling element 22f corresponding to the first coupling element 20f. The first coupling element 20f forms an interface receiver, while the second coupling element 22f forms an interface protrusion. The first coupling element 20f delimits an interface receiver. The first coupling element 20f is configured integrally with the application unit 12f. The first coupling element 20f is arranged on a side of the application unit 12f facing away from the head region 46f.

[0214] The second coupling element 22f is formed by a separate component. The second coupling element 22f of the coupling unit 18f consists at least largely of a plastic. In principle however, it would also be conceivable for the second coupling element 22f to consist of another material which appears suitable to a person skilled in the art. The second coupling element 22f has a plug-like coupling structure 86e. The second coupling element 22f also has a base body 88f on which the plug-like coupling structure 86e is arranged. The base body 88f is designed straight towards the handle unit 14f and chamfered towards the application unit 12f. The base body 88f in particular has a chamfer towards the application unit 12f of at least approximately 45° relative to the longitudinal axis 30f. The second coupling element 22f is formed as one piece. Furthermore, the second coupling element 22f has an interface (not visible further) for coupling with the handle unit 14f. The interface is arranged on a side of the base body 88f facing the plug-like coupling structure 86f. The second coupling element 22f is connected to the handle unit 14f at least by form fit and/or substance bonding. The second coupling element 22f is connected to the handle unit 14f for example by means of a push fit and/or adhesive connection. The second coupling element 22f is formed so as to be detachable from the handle unit 14f for disposal. The handle unit 14f has an interface for a firm connection with the second coupling element 22f. The interface is preferably configured as a blind hole. The handle unit 14f, at an end facing the application unit 12f, has a recess (not visible further) in which the second coupling element 22f is secured. The recess may for example be made in the form of a blind hole in the longitudinal direction by turning and/or drilling. On production of the oral hygiene device 10f, the handle unit 14f and the second coupling element 22f are produced separately and assembled afterwards. Assembly takes place for example by means of a catch connection. However, as already stated above, other assembly means are conceivable which appear suitable to a person skilled in the art. The connection between the second coupling element 22f and the handle unit 14f may in particular be configured so as to be fixed and inseparable, or exchangeable. Differently colored second coupling elements 22f may bring the necessary distinction, in particular with a uniform handle color.

[0215] FIGS. 7A to 7H show an oral hygiene device 10g in various illustrations. The oral hygiene device 10g is configured as an exchangeable head toothbrush. The oral hygiene device 10g has an application unit 12g. The oral hygiene device 10g furthermore has a handle unit 14g. The application unit 12g is formed by a push-on part. The application unit 12g has a base body 13g. The application unit 12g can be detached from the handle unit 14c, in particular without tools. Furthermore, the oral hygiene device 10g comprises a coupling unit 18g for releasable coupling of the application unit 12g to the handle unit 14g. In general, the cleaning region 48g of the application unit 12g is illustrated schematically.

[0216] The handle unit 14g has as an outer form an at least approximate figure-of-eight shape when viewed in a plane parallel to the main extension plane of the handle unit 14g. The handle unit 14g has a base body 16g. The base body 16g of the handle unit 14g delimits at least one opening 24g. The opening 24g extends completely through the base body 16g and is surrounded by the base body 16g in at least one plane. The opening 24g is completely surrounded by the base body 16g in a plane parallel to the main extension plane of the handle unit 14g. The opening 24g is completely surrounded by the base body 16g in the main extension plane of the handle unit 14g. The base body 16g has a loop 52g which extends around the opening 24g. The opening 24g has a lenticular cross-sectional form in the main extension plane of the handle unit 14g. The opening 24g is in particular oriented along the longitudinal axis 30g of the handle unit 14g. The loop 52g of the base body 16g forms two lateral longitudinal webs 54g, 54g′, which are connected at a front end and a rear end of the opening 24g along a longitudinal axis 30g, and surround the opening 24g. The loop 52g is closed. In particular there are no open ends, such as for example fork-like designs. The loop 52g has for example an at least approximately diamond-shaped cross-section in a plane perpendicular to the longitudinal axis 30g. The longitudinal webs 54g, 54g′ of the loop 52g have a diamond-shaped cross-section. The longitudinal webs 54g, 54g′ of the loop 52g are rounded or radiused on the outside, i.e. outside the opening 24g. Furthermore, the longitudinal webs 54g, 54g′ of the loop 52g are approximately angular on the inside, i.e. facing the opening 24g, in particular they have sharp edges. The cross-sections of the longitudinal webs 54g, 54g′ each have four sides, of which at least one is concavely curved and at least one is convexly curved. Preferably, at least one of the sides of the cross-sections of the longitudinal webs 54g, 54g′ facing the opening 24g on the front side 34g is concavely curved. Furthermore, preferably the outer sides, i.e. in particular the sides of the cross-sections of the longitudinal webs 54g, 54g′ facing away from the opening 24g, are convexly curved. The cross-sections of the longitudinal webs 54g, 54g′ may change at least partially over a longitudinal course, in particular with respect to the dimensioning of the cross-section.

[0217] The handle unit 14g has a thumb grip region 26g. The handle unit 14g furthermore has a palm grip region 60g. The opening 24g is arranged at least partially in the palm grip region 60g. The base body 16g and the opening 24g form a constriction between the thumb grip region 26g and the palm grip region 60g. The constriction is used, inter alia, to set back the thumb grip region 26g. The thumb grip region 26g does not however take up the complete part of the handle unit 14g in front of the constriction, but substantially only the foremost part.

[0218] FIGS. 8A to 8H show an oral hygiene device 10h in various illustrations. The oral hygiene device 10h is configured as an exchangeable head toothbrush. The oral hygiene device 10h has an application unit 12h. The oral hygiene device 10h furthermore has a handle unit 14h. The application unit 12h is formed by a push-on part. The application unit 12h has a base body 13h. The application unit 12h can be detached from the handle unit 14h, in particular without tools. Furthermore, the oral hygiene device 10h comprises a coupling unit 18h for releasable coupling of the application unit 12h to the handle unit 14h. In general, the cleaning region 48h of the application unit 12h is illustrated schematically.

[0219] The handle unit 14h has as an outer form an at least approximately drop-like shape viewed in a plane parallel to the main extension plane of the handle unit 14h. The handle unit 14h has a base body 16h. The base body 16h of the handle unit 14h delimits at least two openings 24h, 24h′ which are arranged substantially parallel to the main extension direction. The openings 24h, 24h′ extend completely through the base body 16h and are each surrounded by the base body 16h in at least one plane. The openings 24h, 24h′ are completely surrounded by the base body 16h in a plane parallel to the main extension plane of the handle unit 14h. The openings 24h, 24h′ are completely surrounded by the base body 16h in the main extension plane of the handle unit 14h. The base body 16h has a loop 52h which extends around the openings 24h, 24h′, wherein a rib 90h is formed in the loop 52h along the longitudinal axis and divides the opening in the loop 52h into two openings 24h, 24h′. The openings 24h, 24h′ have a banana-like cross-sectional form in the main extension plane of the handle unit 14h. The openings 24h, 24h′ are in particular oriented along the longitudinal axis 30h of the handle unit 14h. The loop 52h of the base body 16h forms two lateral longitudinal webs 54h, 54h′ which are connected at a front end and a rear end of the openings 24h, 24h′ along the longitudinal axis 30b, and surround the opening 24h, and also the rib 90h which divides the opening of the loop into two openings 24h, 24h′. The loop 52h is closed. In particular there are no open ends, such as for example fork-like designs. The loop 2h has for example an at least approximately diamond-shaped cross-section in a plane perpendicular to the longitudinal axis 30h. The longitudinal webs 54h, 54h′ of the loop 52h have a diamond-shaped cross-section. The longitudinal webs 54h, 54h′ of the loop 52h are rounded or radiused on the outside, i.e. outside the openings 24h, 24h′. Furthermore, the longitudinal webs 54h, 54h′ of the loop 52h are approximately angular on the inside, i.e. facing the openings 24h, 24h′, in particular they have sharp edges. The cross-sections of longitudinal webs 54h, 54h′ each have four sides, of which at least one is concavely curved and at least one is convexly curved. Preferably, at least one of the sides of the cross-sections of the longitudinal webs 54h, 54h′ facing the openings 24h, 24h′ on the front side 34h is concavely curved. Furthermore, preferably the outer sides, i.e. in particular the sides of the cross-sections of the longitudinal webs 54h, 54h′ facing away from the openings 24h, 24h′, are convexly curved. The cross-sections of the longitudinal webs 54h, 54h′ may change at least partially over a longitudinal course, in particular with respect to the dimensioning of the cross-section.

[0220] The handle unit 14h has a thumb grip region 26h. The handle unit 14h furthermore has a palm grip region 60h. The openings 24h, 24h′ are arranged at least partially in the palm grip region 60h. The base body 16h and the openings 24h, 24h′ form a constriction between the thumb grip region 26h and the palm grip region 60h. The constriction is used, inter alia, to set back the thumb grip region 26h. The thumb grip region 26h does not however take up the complete part of the handle unit 14h in front of the constriction, but substantially only the foremost part.

[0221] FIGS. 9A to 9E show an oral hygiene device 10i in various illustrations. The oral hygiene device 10i is configured as an exchangeable head toothbrush. The oral hygiene device 10i has an application unit 12i. The oral hygiene device 10i furthermore has a handle unit 14i. The application unit 12i is formed by a push-on part. The application unit 12i has a base body 13i. The application unit 12i can be detached from the handle unit 14c, in particular without tools. Furthermore, the oral hygiene device 10i comprises a coupling unit 18i for releasable coupling of the application unit 12i to the handle unit 14i. In general, the cleaning region 48i of the application unit 12i is illustrated schematically.

[0222] The handle unit 14i has as an outer form a slightly waisted base form when viewed in a plane parallel to the main extension plane of the handle unit 14i. The handle unit 14i has a base body 16i. The base body 16i of the handle unit 14i delimits various recesses 24i which are created from a front side 34i and from a rear side 36i′. The recesses 24i extend into the base body 16i and in each case meet further recesses 24i which are cut out from the other side. The recesses 24i are completely surrounded by the base body 16i in at least one plane. The recesses 24i are completely surrounded by the base body 16i in a plane parallel to a main extension plane of the handle unit 14i. The recesses 24i are completely surrounded by the base body 16i in the main extension plane of the handle unit 14i.

[0223] The recesses 24i are formed offset, i.e. the recesses 24i on the front side 34i, in their form, do not extend completely 1:1 to the rear side 36i. In this way, webs 92i are formed between the recesses 24i and delimit the form. The webs 92i form the surface in the handle unit 14i or in the base body 16i. The webs 92i are oriented perpendicularly to the main extension direction and frame the recesses 24i. The recesses 24i are arranged linearly along the main extension direction 42i. The recesses 24i are arranged offset on the front side 34i and on the rear side 36i.

[0224] The handle unit 14i has a thumb grip region 26i. The handle unit 14i furthermore has a palm grip region 60i. The recesses 24i are arranged at least partially in the palm grip region 60i. The base body 16i and the recesses 24i form a constriction between the thumb grip region 26i and the palm grip region 60i. The constriction is used, inter alia, to set back the thumb grip region 26h. The thumb grip region 26i does not however take up the complete part of the handle unit 14i in front of the constriction, but substantially only the foremost part. The thumb grip region 26i is preferably at least partially formed by a recess 24i.

[0225] FIGS. 10A to 10E show an oral hygiene device 10j in various illustrations. The oral hygiene device 10j is configured as an exchangeable head toothbrush. The oral hygiene device 10j has an application unit 12j. The oral hygiene device 10j furthermore has a handle unit 14j. The application unit 12j is formed by a push-on part. The application unit 12j has a base body 13j. The application unit 12j can be detached from the handle unit 14j, in particular without tools. Furthermore, the oral hygiene device 10j comprises a coupling unit 18j for releasable coupling of the application unit 12j to the handle unit 14j. In general, the cleaning region 48j of the application unit 12j is illustrated schematically.

[0226] The handle unit 14j has as an outer form a slightly waisted base form when viewed in a plane parallel to the main extension plane of the handle unit 14j. The handle unit 14j has a base body 16j. The base body 16j of the handle unit 14j delimits various recesses 24j which are created from a front side 34j, a rear side 36j, from the left and right sides. The recesses 24j extend into the base body 16j and in each case meet further recesses 24j which are cut out from the other sides. The recesses 24j are completely surrounded by the base body 16j in at least one plane. The recesses 24j are completely surrounded by the base body 16j in a plane parallel to a main extension plane of the handle unit 14j. The recesses 24j are completely surrounded by the base body 16j in the main extension plane of the handle unit 14j.

[0227] The recesses 24j are formed offset, i.e. the recesses 24j on the front side 34j, in their form, do not extend completely 1:1 to the rear side 36j. In this way, webs 94j are formed between the recesses 24j and delimit the form. The webs 94j form the surface in the handle unit 14j or in the base body 16j. The webs 94j are not specifically oriented and frame the recesses 24j. The recesses 24j are arranged alternately along a main extension direction 42j, such that one recess 24j and then two recesses 24j are arranged alternately on a side. The recesses 24j are arranged offset on the front side 34j and on the rear side 36j, so that a recess 24j on the one side meets two recesses 24j on the other side.

[0228] The handle unit 14j has a thumb grip region 26j. The handle unit 14j furthermore has a palm grip region 60j. The recesses 24j are arranged at least partially in the palm grip region 60j. The base body 16j and the recesses 24j form a constriction between the thumb grip region 26j and the palm grip region 60j. The constriction is used, inter alia, to set back the thumb grip region 26j. The thumb grip region 26j does not however take up the complete part of the handle unit 14j in front of the constriction, but substantially only the foremost part. The thumb grip region 26j is preferably at least partially formed by a recess 24j.

[0229] FIGS. 11A and 11B show an oral hygiene device 10k in different illustrations. The oral hygiene device 10k is configured as an exchangeable head toothbrush. The oral hygiene device 10k has an application unit 12k. The oral hygiene device 10k furthermore has a handle unit 14k. The application unit 12k is formed by a push-on part. The application unit 12k has a base body 13k. The application unit 12k can be detached from the handle unit 14k, in particular without tools. Furthermore, the oral hygiene device 10k comprises a coupling unit 18k for releasable coupling of the application unit 12k to the handle unit 14k. In general, the cleaning region 48k of the application unit 12k is illustrated schematically.

[0230] The handle unit 14k has a base body 16k. The base body 16k of the handle unit 14k is at least substantially symmetrical relative to a longitudinal axis 30k of the handle unit 14k. The base body 16k of the handle unit 14k is formed waisted in a palm grip region 60k. Furthermore, the base body 16k of the handle unit 14k is formed waisted between the thumb grip region 26k and the palm grip region 60k. The handle unit 14k is formed in several pieces. The handle unit 14k is formed for example in two pieces. The handle unit 14k comprises the base body 16k. Furthermore, on a side of the base body 16k facing away from the application unit 12k, the handle unit 14k has a terminating element 96k. A free end of the handle unit 14k facing away from the coupling unit 18k is configured in the form of a terminating unit 96k.

[0231] Furthermore, the oral hygiene device 10k comprises the coupling unit 18k for releasable coupling of the application unit 12k to the handle unit 14k.

[0232] The coupling unit 18k comprises a first coupling element 20k. The coupling unit 18k furthermore comprises a second coupling element 22k corresponding to the first coupling element 20k. The first coupling element 20k forms an interface receiver, while the second coupling element 22k forms an interface protrusion. The first coupling element 20k delimits an interface receiver. The first coupling element 20k is configured integrally with the application unit 12k. The first coupling element 20k is arranged on a side of the application unit 12k facing away from the head region 46a.

[0233] The second coupling element 22k is formed from a separate component. The second coupling element 22k of the coupling unit 18k consists at least largely of a plastic. In principle however, it would also be conceivable for the second coupling element 22k to consist of another material which appears suitable to a person skilled in the art (as listed above). The second coupling element 22k has a plug-like coupling structure 86k. The second coupling element 22k also has a base body 88k on which the plug-like coupling structure 86k is arranged. The base body 88k is designed widening towards the handle unit 14k and chamfered towards the application unit 12k. The base body 88k in particular has a chamfer, towards the application unit 12k, of at least approximately 45° relative to the longitudinal axis 30k. The second coupling element 22k is formed as one piece. Furthermore, the second coupling element 22k has an interface 98k for coupling with the handle unit 14k. This interface 98k is arranged on a side of the base body 88k facing the plug-like coupling structure 86k. The second coupling element 22k is connected to the handle unit 14k at least by form fit and/or substance bonding. The second coupling element 22k is connected for example to the handle unit 14k by means of a push fit and/or adhesive connection. The second coupling element 22k is formed so as to be detachable from the handle unit 14k for disposal. The interface 98k has two connecting pins for connection to the handle unit 14k. The handle unit 14k has an interface 100k for a firm connection to the second coupling element 22k. The interface 100k is preferably configured as a blind hole. The interface 100k of the handle unit 14k, at an end facing the application unit 12k, has several, in particular two openings in which the interface 98k of the second coupling element 22k is secured. The connecting pins of the interface 98k of the second coupling element 22k are provided to engage in the corresponding opening of the interface 100k in the base body 16k of the handle unit 14k. The openings may be made for example in the form of blind holes in the longitudinal direction by turning and/or drilling. On production of the oral hygiene device 10k, the handle unit 14k and the second coupling element 22k are produced separately and assembled afterwards. Assembly takes place for example by means of a catch connection. However, as already stated above, other assembly means are conceivable which appear suitable to a person skilled in the art. The connection between the second coupling element 22k and the handle unit 14k may in particular be configured so as to be fixed and inseparable, or exchangeable. Differently colored second coupling elements 22k may bring the necessary distinction, in particular with a uniform handle color.

[0234] The second coupling element 22k may, in addition to the functions already described, also contain the thumb grip region 26k. Accordingly, the second coupling element 22k may have structures for forming the thumb grip region 26k. As shown as an example, these may be raised ribs which prevent the thumb from slipping.

[0235] Furthermore, the handle unit 14k comprises the terminating element 96k. The terminating element 96k is formed from a separate component. The terminating element 96k consists at least largely of a plastic. In principle however, it is also conceivable that the terminating element 96k consists of other materials which appear suitable to a person skilled in the art (as listed above). Furthermore, the terminating element 96k has an interface 102k for coupling to the handle unit 14k. The interface 102k is arranged on a side of the base body 88k facing the end. The terminating element 96k is connected to the handle unit 14k at least by form fit and/or substance bonding. The terminating element 96k is connected to the handle unit 14k for example by means of a push fit and/or adhesive connection. The terminating element 96k is in particular configured so as to be detachable from the handle unit 14k for disposal. The interface 102k has two connecting pins for connection to the handle unit 14k. The handle unit 14k has an interface (not visible further) for a firm connection to the terminating element 96k. The interface is preferably formed as a blind hole. At an end facing the terminating element 96k, the handle unit 14k has several, in particular two openings (not visible further) in which the terminating element is secured. The connecting pins of the interface 102k of the terminating element 96k are provided to engage in the corresponding opening of the interface in the base body 16k of the handle unit 14k. The openings may be made for example in the form of blind holes in the longitudinal direction by turning and/or drilling. On production of the oral hygiene device 10k, the handle unit 14k and the terminating element 96k are produced separately and assembled afterwards. Assembly takes place for example by means of a catch connection. However, as already stated above, other assembly means are conceivable which appear suitable to a person skilled in the art. The connection between the terminating element 96k and the handle unit 14k may in particular be configured so as to be fixed and inseparable, or exchangeable. Differently colored terminating elements 96k may bring the necessary distinction, in particular with a uniform handle color.

[0236] The descriptions given for specific figures may evidently also be transferred to other figures which show the same or similar features, and in which the features are not described in the same detail.

LIST OF REFERENCE SIGNS

[0237] 10 Oral hygiene device [0238] 12 Application unit [0239] 13 Base body [0240] 14 Handle unit [0241] 16 Base body [0242] 18 Coupling unit [0243] 20 Coupling element [0244] 24 Opening, recess [0245] 26 Thumb grip region [0246] 28 Opening [0247] 30 Longitudinal axis [0248] 32 Surface [0249] 34 Front side [0250] 36 Rear side [0251] 38 Vertical axis [0252] 40 Transverse axis [0253] 42 Main extension direction [0254] 44 Neck region [0255] 46 Head region [0256] 48 Cleaning region [0257] 50 Gripping face [0258] 52 Loop [0259] 54 Longitudinal web [0260] 56 Loop [0261] 58 Longitudinal web [0262] 60 Palm grip region [0263] 62 Stage [0264] 64 Stage [0265] 66 Stage [0266] 68 Stop face [0267] 70 Part element [0268] 72 Part element [0269] 74 Groove [0270] 76 Part element [0271] 78 Part element [0272] 80 Part element [0273] 82 Cam [0274] 84 Latching recess [0275] 86 Coupling structure [0276] 88 Base body [0277] 90 Rib [0278] 92 Web [0279] 94 Web [0280] 96 Terminating element [0281] 98 Interface [0282] 100 Interface [0283] 102 Interface