Surface-machining appliance with a suction connection

Abstract

A surface processing device, in particular a manual grinding device, includes a processing body which has at least one processing surface for grinding or polishing a workpiece surface, wherein inlet openings are arranged on the at least one processing surface for suctioning off dust-laden dust air and these inlet openings are flow-connected via a duct arrangement to a suction connection to which a suction device can be connected. The surface processing device is provided with an adjustment means for adjustment of effective flow cross-sections, with which inlet openings of a first processing surface section of the at least one processing surface and inlet openings of at least one second processing surface section of the at least one processing surface are flow-connected to the suction connection, so that a suction effect on the first processing surface section and the at least one second processing surface section can be set and/or switched off.

Claims

1. A surface processing device, with a processing body which has at least one processing surface for grinding or polishing a workpiece surface, wherein inlet openings for suctioning off dust-laden dust air are arranged on the at least one processing surface, said plurality of inlet openings being flow-connected via a duct arrangement to a suction connection to which a suction device can be connected, and wherein the processing device further comprises an adjustment device for adjustment of a suction flow of the dust-laden dust air, with which the inlet openings of a first processing surface section of the at least one processing surface and the inlet openings of at least one second processing surface section of the at least one processing surface are flow-connected to the suction connection, so that a suction effect on the first processing surface section and the at least one second processing surface section can be set or switched off, and wherein the first processing surface section and the at least one second processing surface section are arranged on mutually angular sides of an outer circumference of the processing body, and wherein the adjustment device has a manually operable adjustment element for adjusting the suction flow, and wherein the adjustment element is connected to a mask body, wherein the mask body is arranged between the inlet openings of the processing surface sections and the suction connection, the mask body having a passage section and at least one reducing section, the passage section having at least one passage opening and the at least one reducing section being adapted to reduce the suction flow between the inlet openings of at least one processing surface section and the suction connection as compared to the passage section, wherein the mask body is rotatably mounted within the processing body for positioning the passage section or the at least one reducing section with respect to the processing body.

2. The surface processing device according to claim 1, wherein the adjustment device is designed to reduce the suction flow between the suction connection and the inlet openings of the first processing surface section in favor of an increase in the suction flow between the suction connection and the inlet openings of the at least one second processing surface section.

3. The surface processing device according to claim 1, wherein the adjustment device is designed such that either the inlet openings of the first processing surface section or the inlet openings of the at least one second processing surface section are connected to the suction connection for switching a flow connection between the suction connection and the inlet openings of the first processing surface section and the inflow openings of the at least one second processing surface section.

4. The surface processing device according to claim 1, further comprising fixing means for fixing the adjustment device in at least one setting position in which the suction connection is flow-connected to only one of the processing surfaces.

5. The surface processing device according to claim 1, wherein the mask body permits the suction flow between the inlet openings of a respective processing surface section and the suction connection only at the passage section.

6. The surface processing device according to claim 1, wherein at least one central duct extends along a longitudinal axis of the processing body and is flow-connected to the suction connection and to the inlet openings of at least one of the first processing surface section or the at least one second processing surface section by means of transverse ducts.

7. The surface processing device according to claim 1, wherein a respective suction duct is provided for each processing surface, wherein each suction duct extends along the longitudinal axis of the processing body and is flow-connected to the inlet openings of the respective processing surface section.

8. The surface processing device according to claim 1, wherein a sleeve-shaped connecting element of the suction connection is mounted rotatably with respect to the processing body for connecting a suction hose, the processing body and the suction hose being rotatable relative to one another without an adjustment of the adjustment device.

9. The surface processing device according to claim 1, wherein an inlet channel arrangement, which is open laterally with respect to the processing surface, is arranged on the at least one processing surface and is flow-connected to the suction connection by means of at least one of the inlet openings.

10. The surface processing device according to claim 1, wherein the processing body has a flat surface portion with a flat processing surface for processing flat workpiece surfaces and at least one curved portion with a curved processing surface for processing curved workpiece surfaces.

11. The surface processing device according to claim 10, wherein the curved portion adjoins transverse end regions of the flat surface portion and extends over a side of the processing body opposite to the flat surface portion, wherein the curved portion has a plurality of continuously merging curvature sections with mutually different radii of curvature and, wherein the curved portion does not extend beyond the flat processing surface of the flat surface portion.

12. A surface processing device with a processing body which has at least one processing surface for grinding or polishing a workpiece surface, wherein inlet openings for suctioning off dust-laden dust air are arranged on the at least one processing surface, said plurality of inlet openings being flow-connected via a duct arrangement to a suction connection to which a suction device can be connected, and wherein the processing device further comprises an adjustment device for adjustment of a suction flow of the dust-laden dust air, with which the inlet openings of a first processing surface section of the at least one processing surface and the inlet openings of at least one second processing surface section of the at least one processing surface are flow-connected to the suction connection, so that a suction effect on the first processing surface section and the at least one second processing surface section can be set or switched off, and wherein the first processing surface section and the at least one second processing surface section are arranged on mutually angular sides of an outer circumference of the processing body, and wherein at least one central duct extends along a longitudinal axis of the processing body and is flow-connected to the suction connection and to the inlet openings of at least one of the first processing surface section or the at least one second processing surface section by means of transverse ducts, and wherein an air guiding body is mounted rotatably within the central duct about an axis extending along the longitudinal axis, wherein the air guiding body has at least one through-flow opening on its outer circumference, the at least one through-flow opening being flow-connected to a flow channel defined by an interior of the air guiding body, the flow channel extending along the longitudinal axis and is flow-connected to the suction connection, so that, by rotating the air guiding body in the central duct, the at least one through-flow opening of the air guiding body is displaced relative to the inlet openings and to at least one passage opening of the central duct communicating with the inlet openings of at least one processing surface section for changing the effective flow of the suction flow between the inlet openings relative to the suction connection.

13. The surface processing device according to claim 12, wherein the adjustment device has a manually operable adjustment element for adjusting the suction flow.

14. The surface processing device according to claim 13, wherein the adjustment element is connected to a mask body, wherein the mask body is arranged between the inlet openings of the processing surface sections and the suction connection, the mask body having a passage section and at least one reducing section, the passage section having at least one passage opening and the at least one reducing section being adapted to reduce the suction flow between the inlet openings of at least one processing surface section and the suction connection as compared to the passage section, wherein the mask body is rotatably mounted within the processing body for positioning the passage section or the at least one reducing section with respect to the processing body.

15. The surface processing device according to claim 12, wherein the air guiding body has a first angular segment region and a second angular segment region of its outer circumference, the at least one through-flow opening being provided on the first angular segment region and no through-flow openings or through-flow openings with a smaller flow cross-section than the at least one through-flow opening provided on the first angular segment region being provided on the second angular segment region, wherein the through-flow openings are flow-connected to the central duct, and wherein by rotating the air guiding body, the first angular segment region and the second angular segment region are displaced relative to the inlet openings of the first processing surface section or the at least one second processing surface section for adjustment of the effective flow of the suction flow between the suction connection and the respective processing surface.

16. The surface processing device according to claim 12, wherein the air guiding body has sealing contours on its outer circumference which extend in the longitudinal direction and delimit at least one angular segment region or wherein the air guiding body has sealing contours, which extend in the circumferential direction and delimit a longitudinal region and, wherein the sealing contours bear against an inner circumference of the central duct.

17. A surface processing device with a processing body which has at least one processing surface for grinding or polishing a workpiece surface, wherein inlet openings for suctioning off dust-laden dust air are arranged on the at least one processing surface, said plurality of inlet openings being flow-connected via a duct arrangement to a suction connection to which a suction device can be connected, and wherein the processing device further comprises an adjustment device for adjustment of a suction flow of the dust-laden dust air, with which the inlet openings of a first processing surface section of the at least one processing surface and the inlet openings of at least one second processing surface section of the at least one processing surface are flow-connected to the suction connection, so that a suction effect on the first processing surface section and the at least one second processing surface section can be set or switched off, and wherein the first processing surface section and the at least one second processing surface section are arranged on mutually angular sides of an outer circumference of the processing body, and wherein a respective suction duct is provided for each processing surface, wherein each suction duct extends along the longitudinal axis of the processing body and is flow-connected to the inlet openings of the respective processing surface section, and wherein the adjustment device has a manually operable adjustment element for adjusting the suction flow, and wherein the adjustment element is connected to a mask body, wherein the mask body is arranged between the inlet openings of the processing surface sections and the suction connection, the mask body having a passage section and at least one reducing section, the passage section having at least one passage opening and the at least one reducing section having a closure surface for closing a flow connection between the inlet openings of at least one processing surface section and the suction connection or has a smaller effective flow cross-section than the passage section, wherein the mask body for positioning the passage section or the at least one reducing section between the suction connection and the inlet openings of a respective processing surface section is mounted rotatably, with respect to the processing body by means of a rotary bearing, for the purpose of positioning the passage section or the at least one reducing section, and wherein the mask body is arranged between the suction connection and the suction ducts, wherein the mask body is mounted movably by means of the bearing between a respective suction duct and the suction connection for positioning the passage section and the at least one reducing section.

18. A surface processing device, with a processing body which has at least one processing surface for grinding or polishing a workpiece surface, wherein inlet openings for suctioning off dust-laden dust air are arranged on the at least one processing surface, said plurality of inlet openings being flow-connected via a duct arrangement to a suction connection to which a suction device can be connected, and wherein the processing device further comprises an adjustment device for adjustment of a suction flow of the dust-laden dust air with which the inlet openings of a first processing surface section of the at least one processing surface and the inlet openings of at least one second processing surface section of the at least one processing surface are flow-connected to the suction connection, so that a suction effect on the first processing surface section and the at least one second processing surface section can be set or switched off, and wherein the adjustment device comprises: a manually operable adjustment element for adjusting the suction flow; and a mask body connected to the adjustment element, wherein the mask body is arranged between the inlet openings of the processing surface sections and the suction connection, the mask body having a passage section and at least one reducing section, the passage section having at least one passage opening and the at least one reducing section being adapted to reduce the suction flow between the inlet openings of at least one processing surface section and the suction connection as compared to the passage section, wherein the mask body is rotatably mounted within the processing body for positioning the passage section or the at least one reducing section with respect to the processing body.

19. The surface processing device according to claim 18, wherein the first processing surface section and the at least one second processing surface section are arranged on mutually angular sides of an outer circumference of the processing body or wherein the first processing surface section and the at least one second processing surface section are arranged on opposite sides of the processing body.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Embodiments of the invention are explained below using the drawing. This shows:

(2) FIG. 1 a perspective oblique view of a surface processing device;

(3) FIG. 2 a perspective oblique view of an abrasive for the processing device according to FIG. 1;

(4) FIG. 3 an exploded view of an adjustment device for adjustment a suction effect on the processing device according to the diagrams above;

(5) FIG. 4 a frontal view of a processing body of the processing device according to the figures above in order to illustrate its outer peripheral contour, which is shown in a

(6) FIG. 5 a cross-section along a section line A-A in FIG. 1;

(7) FIG. 6 a longitudinal section through the processing device according to FIG. 1, along a cutting line A-A in FIG. 1;

(8) FIG. 7 a detail D1 from FIG. 6;

(9) FIG. 8 a side view of an alternative adjustment device for adjustment a suction effect on the processing device according to the diagrams above;

(10) FIG. 9 a longitudinal section through the adjustment device as shown in FIG. 8, along a cut line C-C in FIG. 8;

(11) FIG. 10 a detail D2 from FIG. 9;

(12) FIG. 11 an exploded view of the adjustment device according to FIGS. 8-10;

(13) FIG. 12 a mask body of the adjustment device according to FIG. 11 in perspective oblique view;

(14) FIG. 13 an alternative processing body and an adjustment device with a functional principle similar to the adjustment device according to FIGS. 8-12, wherein the processing body has separate tubular suction ducts;

(15) FIG. 14 shows the processing body and the adjustment device according to FIG. 13, but in a different setting position of the adjustment device;

(16) FIG. 15 the arrangement according to FIGS. 13, 14, with the adjustment device being further adjusted, and

(17) FIG. 16 shows a processing body designed as a stepped body.

DETAILED DESCRIPTION

(18) A processing device 10 comprises a processing body 20, the outer circumference of which is provided with several processing surfaces 21, 22 and 23. By means of the processing surfaces 21-23, a schematically indicated workpiece W can be processed on its workpiece surface O, e.g. ground and/or polished. The processing surfaces 21-23 extend on an outer circumference 24 of the cylindrical processing body 20. The processing body 20 has a longitudinal shape and extends along a longitudinal direction or longitudinal axis L.

(19) The processing surface 21 is equipped as a flat surface 25 or flat surface with which a correspondingly flat workpiece surface O can be optimally processed. The processing surface 21 or flat surface 25 is provided on a processing surface section 28, which is designed as a flat surface portion 26 on the basis of the flat surface 25.

(20) The processing surfaces 22 and 23, on the other hand, are curved processing surfaces and are provided on processing surface sections 29, 30, which form part of a curved portion 27.

(21) The processing surfaces 21-23 merge into each other continuously, so that they can also be described as a single processing surface. The distinction between processing surfaces 21-23 is intended in particular to clarify the assignment to the processing surface sections 28-30.

(22) In any case, the curved processing surfaces 22-23 in principle form a single processing surface, which, however, has different radii of curvature and thus different geometric properties, as will become clear below.

(23) The curved portion 27 has several continuously merging curvature sections 31, 32, 33, 34, 35, 36 with different radii of curvature, for example R1, R2, R3, R4, R5. The curvature sections 31-36 merge continuously into each other, which means that ultimately there are also other radii of curvature which are not named in detail here. It is possible, for example, that the curved portion 27, starting from the radius of curvature R1, has a large number of radii of curvature not explained in detail up to the radius of curvature R5.

(24) At a transition area 37 shown in FIGS. 4 and 5 on the right, the flat surface portion 26 merges tangentially into the curved portion 27. The smallest radius of curvature R1 is present there. The curved portion 27 projects laterally into the transition area 37 in front of the flat surface portion 26. However, the curved portion 27 does not project in front of the flat surface 25 frontally and or in its normal direction. A flat engagement of the flat surface 25 with the workpiece surface O is therefore possible without being affected by the curved portion 27. However, the narrow radius of curvature R1 allows the processing of correspondingly curved or narrow parts of the workpiece surface O.

(25) In contrast to radius R1, radius R5 is significantly larger, for example at least twice as large or three times as large, preferably about four times as large as radius R1, so that the curved portion 27 ends relatively flat towards a transition area 38, where the curved portion 27 angularly adjoins the flat surface portion 26, for example with an angle of less than 90°, preferably 80-70°. Transition area 38 and transition area 37 are provided on opposite sides of the flat surface portion 26 and extend along the longitudinal axis L.

(26) Overall, the processing body 20 has a cylindrical, wing-like shape, whereby the underside of the “wing”, unlike a real wing, is flat or even, i.e. has no concave or convex curvatures. The upper side of this wing extends in a convex manner over the flat surface 25 and is round at the transition area 37, while in the transition area 38 it ends at an angle to the flat surface 25.

(27) A transverse width B1 of the flat surface 25 or the flat surface portion 26 is almost as large as a transverse width B2 of the curved portion 27, such that the surface of the curved portion 27 and the flat surface 25 that can effectively be used for workpiece processing is similarly large.

(28) However, the usable surface area of the curved portion 27 is larger insofar as the transverse width B2 is larger than the transverse width B1 and the curved portion 27 also extends in a convex manner over the flat surface portion 26, or curves, so to speak. The processing body 20 has a height H over which the curved portion 27 curves over the flat surface portion 26.

(29) It is expedient that the height H is about half as large as the transverse width B1 or B2.

(30) This results in a compact, handy and therefore manually conveniently grippable processing body 20.

(31) In this embodiment, the angular transition range 38 is not intended for workpiece processing. In principle, however, this would be readily possible, for example if an appropriate polishing agent or abrasive is available.

(32) In the present embodiment, however, it is provided that a base material or base material 39 of processing body 20 is exposed in the transition area 38, i.e. no polishing agent or abrasive is provided and also no adhesive or holding means 40 is provided, which otherwise extends over the outer circumference 24 of processing body 20. The base material 39, for example, is a polyurethane foam or other elastic material. Adhesive or holding means 40 includes, for example, an adhesive layer, an adhesive layer or the like.

(33) The transition area 38 without holding means 40 has a grip zone or grip areas 41 at which an abrasive 120 in the form of an abrasive sheet described below can be conveniently grasped and thus removed from the processing body 20.

(34) The relatively soft processing body 20 is covered by covers 42, 43 at its end faces, the cylinder base surfaces so to speak, and thus protected. The covers 42, 43 are preferably harder than the base material 39, e.g. made of a thermoplastic material. Covers 42, 43 include or are designed as cover plates, for example. Covers 42, 43 may be bonded to the foam material of the processing body 20.

(35) The abrasive 120 has holding means 140, for example a Velcro layer or hook, which work together with the holding means 40 of the processing body 20 in the sense of a fixed neck suitable for surface processing of the workpiece W. In other words, the abrasive 120 can be detachably attached to the outer circumference 24 of processing body 20 by means of holding means 140, 40. This is known per se. An abrasive material 124, for example a knitted abrasive material, a grain or the like, is provided on a side of the abrasive 120 opposite to the side of the holding means 140 with which the workpiece surface O can be treated in the sense of abrasive processing or grinding.

(36) Alternatively, it would of course also be possible for an abrasive, polishing agent or the like to be arranged directly on the outer circumference 24 of the processing body 20, for example the abrasive material 124.

(37) When the abrasive 120 is placed on the processing body 20 (not shown), it assumes the shape of the outer periphery 24 of the processing body 20 schematically indicated in FIG. 2. Thus, the abrasive 120 has a processing surface 121 and processing surfaces 122, 123 which are adjacent to the processing surfaces 21, 22, 23 of processing body 20. The processing surface 121 forms a flat surface 125 and thus a flat surface section 126, while the other processing surfaces 122, 123 form components of a curved portion 127, corresponding to the curved portion 27 of the processing body 20.

(38) The abrasive 120 has side edges 141, which are positioned in the handle areas 41 when the abrasive is in the state 20 arranged on the processing body. The abrasive 120 can be gripped comfortably there and removed from the processing body 20, so to speak, whereby the holding means 40, 140 disengage from each other.

(39) Furthermore, inlet openings 150, 151, 152 are provided at the processing surfaces 121, 122, 123 through which dust which is formed, for example, during an abrasive processing of the workpiece surface O using the grinding material 124, can be suctioned off.

(40) The inlet openings 150-152, for example, are made in the form of holes, projections or the like.

(41) When the abrasive 120 is mounted or arranged on the processing body 20, the inlet openings 150-152 communicate with the inlet openings 50, 51 and 52 on the processing surfaces 21, 22, 23, i.e. with the inlet openings 50, 51 and 52 provided on the processing surface sections 28-30.

(42) The inlet openings 50, 51, 52, for example, have angular distances with angles W1 and W2 which are preferably equal. These allow dust to be extracted from the sides of the processing body 20 that are at an angle to each other, i.e. with angular distances W1 and W2.

(43) The inlet openings 50, 51, 52 are flow-connected with an inlet channel arrangement 53, the inlet channels 54, 55, 56 of which are open to the respective processing surface 21, 22, 23. The inlet channels 54-56 are mentioned as examples and represent a large number of inlet channels branching away from the inlet openings 50-52. One or more of the inlet openings 150-152 of the abrasive 120 are arranged above a respective inlet channel 54-56 so that dust-laden air can flow through the respective inlet opening 150-152 into the inlet channels 54-56 and from there further into the inlet openings 50, 51 and 52. This means that an inlet opening 50-52 is not provided for each of the inlet openings 150-152. Instead, dust air can flow through several inlet openings 150-152 and via the inlet channels 54-56 to the inlet openings 50-52. Furthermore it is possible that an inlet channel 54, 55 or 56 communicates or is flow-connected with several of the inlet openings 50 or 51 or 52, which is indicated by the example of the flow channel 55 in FIG. 1. In any case, it is ensured that a dust extraction system is provided under a large number of inlet openings 150-152 of the 120 abrasive.

(44) When using the processing device 10, the processing body 20 is usually only partially in contact with the workpiece W. For example, only one of the processing sections 28, 29 or 30 is effectively used, while the other processing sections are not used. The operator will select the processing section 28, 29, 30 that is best adapted to the surface geometry of the workpiece surface O or which allows optimum grinding or polishing. The problem here is that dust extraction would not only take place at the processing lot 28, 29, 30 used in each case, but also air would flow over the unused processing section 28 or 29 or 30, i.e. false air would flow, so to speak. The measures described below effectively remedy this situation:

(45) The dust extraction can be effectively adjusted by means of an adjustment device 60, 260, 360. The adjustment device 60 is provided for the processing device 10 according to FIGS. 1-7, the adjustment device 260 for a processing device 210 according to FIGS. 8-12 and the adjustment device 360 for a processing device 310 according to FIGS. 13, 14 and 15. The processing devices 210, 310 have processing bodies 220, 320, which are constructed in the same way with regard to their basic external design, for example the external circumference 24, the processing surface sections 28-30 and the like, and are therefore not explained in detail in this respect. However: the flow concept and its adjustment for the suction flow are designed differently. The adjustment devices 60, 260, 360 make it possible to switch the suction between the inlet openings 50, 51 and 52 and in advantageous embodiment to influence the suction capacity or the effective flow cross-section for the suction provided for the inlet openings 50, 51 and 52.

(46) The inlet openings 50, 51 and 52 are flow-connected via a duct arrangement 57 and the adjustment devices 60, 260, 360 with a suction connection 11. The suction connection 11, for example, comprises a connection element 12, especially in the form of a connection pipe to which a suction hose SL can be connected, which leads to a suction device AB. The suction device AB includes, for example, a mobile vacuum cleaner or a stationary central vacuum cleaning system.

(47) At this point it should be mentioned that, according to the invention, a processing device can of course also be equipped with a dust extraction system on board the processing device. For example, it is possible to connect a dust collection container to suction connection 11. Preferably, a fan or other flow generator for generating a suction flow, which can flow through the inlet openings, which are assigned to the processing surfaces, in particular to a respective processing surface section, therefore in the embodiment the inlet openings 50 or 51 or 52, is then assigned to this or connected upstream.

(48) The connection element 12, for example, comprises a connection section 13 for plugging on or plugging in the suction tube SL. A ribbing is preferably provided at connection section 13. The connection element 13 also has a connection section 14 which is intended for rotatable connection with the components of the adjustment device 60 explained below.

(49) The duct arrangement 57 comprises transverse ducts 58, which lead inwards from the inlet openings 50, 51, 52 in the processing body 20, 220, 320 and open out into a central suction duct 45 via passage openings 68 in the processing body 20, into separate suction ducts 245, 246, 247 in the processing body 220 and into separate suction ducts 345, 346, 347 in the processing body 320.

(50) The suction ducts 45, 245, 246, 247 and 345, 346, 347 extend along the longitudinal axis L of the processing body 20, 220, 320, preferably over the entire or almost entire longitudinal length of the processing body 20, 220, 320. They are closed at the front by covers 42, for example, whereby another closure would also be possible.

(51) Suction duct 45 is provided in a suction duct body 65, which has a tubular shape. The suction duct body, for example, has a circumferential wall 66, which is designed as a tube. The circumferential wall 66 or the suction duct body 65 is equipped with ribs 67, which improve the hold in the base material 39 of the processing body 20. For example, the suction duct body 65 is surrounded by the base material 39. On the front side, the suction duct body 65 can be closed by the cover 42, but also by a base that is integrally formed on the suction duct body 45. The cover 42, for example, has a closing projection 42a which can be inserted into the suction duct body 65 or a cavity of the processing body 20 which has the suction duct body 65.

(52) Openings 68 are also provided on the circumferential wall 66, which are flow-connected to the transverse ducts 58, in particular for alignment. Thus, dust air can flow through the inlet openings 50-52 and the transverse ducts 58 as well as finally the passage openings 68 in order to reach the suction duct 45.

(53) On the side facing the suction connection 11, the suction duct body 65 has a connection section 69, for example a connection sleeve 70. At the connection section 69, which is connected to the peripheral wall 66 or represents an extension thereof, a screw thread 71, in particular an internal thread, is preferably provided. Alternatively, a contact surface could also be provided for bonding or latching or the like.

(54) In the suction duct body 65, the suction duct 45 extends and discharges from the suction duct body 65 at the connection section 69.

(55) A connection element 73 is connected to the connection section 69, for example screwed in. The connection element 73, for example, comprises a tubular or sleeve-shaped connection body 74, which has a screw thread 75 at a connection section. The screw thread 75 is screwed into the screw thread 71 of the suction duct body 65 to create an essentially airtight connection.

(56) The connecting body 74, for example, penetrates an opening 44 in the cover 42.

(57) An intermediate space 77 is provided between an end face 76 of the connecting body 74 and the bottom of a receptacle 72 of the connecting section 69, in which the screw thread 71 is arranged.

(58) The connecting element 73 has a bearing receptacle 78 in which an adjustment element 80 engages and in which the adjustment element 80 is rotatably mounted. One axis of rotation D of the adjustment element 80 in relation to the bearing support 78 corresponds to the longitudinal axis L, for example. The connection element 73 and the adjustment element 80 together form bearing elements of a rotary bearing.

(59) The adjustment element 80 has a duct body 81 which projects from an adjustment section 82 of the adjustment element 80 towards the suction duct body 65. The adjustment section 82, for example, has a receptacle 83 in which the connecting element 12 engages with the connecting section 14. The receptacle 83 forms a pivot-bearing receptacle in which the connecting section 14 is rotatably mounted so that a rotary decoupling is created between the connecting element 12 or the suction connection 11 on the one hand and the processing body 20 and/or the adjustment device 60.

(60) A retaining projection 84 is preferably located in receptacle 83, for example an annular or part-annular rib arranged on the inner circumference of receptacle 83 and projecting radially inwards, which engages in a corresponding recess 15 on the connecting section 14 of connecting element 12. By means of the retaining projection 84 and the recess 15, the connecting element 12 is fixed in a tension-resistant manner with respect to its axis of rotation around which it can rotate relative to the receptacle 83. The axis of rotation corresponds to the longitudinal axis L or is parallel to the longitudinal axis L.

(61) It is expedient for the mounting element 12 with a flange projection 16 to be in contact with a face 85 of the adjustment element 80. It is also advantageous if one end face of the connection element 12 or the connection section 14 is supported at the bottom of the slot 83.

(62) Due to the rotary bearing of the connection element 12 on the one hand on the adjustment element 80 and on the other hand on the adjustment element 80 with respect to the processing body 20 or the connection element 73, the adjustment element 80 can rotate freely between the suction hose SL and the processing body 20.

(63) The adjustment element 80 is held on the connection element 73 in a tension-resistant position relative to the longitudinal axis L or its axis of rotation D relative to the connection element 73 by means of a catch. For example, hook projections 86 are provided on the adjustment element, which protrude in front of adjustment section 82. The hook projections 86 have hook lugs 87, which engage in the gap 77, so that the adjustment element 80 on the connecting element 73 is fixed in a tension-resistant manner with respect to the longitudinal axis L of the axis of rotation D with respect to the connecting element 73. The hook projections 86 are spaced from each other in the circumferential direction so that they can be moved radially to lock into the bearing seat 78. Thus the adjustment element 80 can be inserted and locked into the bearing seat 78 along the longitudinal axis L or the rotational axis D. Assembly is simple.

(64) Fixing means 88 are preferred, in particular a locking device or locking means. Fixing means 88 include, for example, locking lugs 89, which project radially outwards in front of the hook projections 86 and engage in corresponding locking recesses 79 of the connection element 73. For example, the locking recesses 79 are provided on an inner circumference of the bearing receptacle 78.

(65) An air guiding body 90 is non-rotatably connected to adjustment element 80, in particular duct body 81. For example, the duct body 81 is inserted into the air guiding body 90 and in the area of a connecting section 81A it is glued, latched, pressed or similarly firmly connected in some other way. If the adjustment element 80 is turned around the axis of rotation D, the air guiding body 90 rotates accordingly.

(66) A combination of a groove and a projection projecting into the groove or similar other mechanical 81B angle of rotation marking, which is provided for example between the duct body 81 and the inner circumference or flow duct 94 of the air duct body 90, is useful for the correct angle of rotation assembly of the adjustment element 80 and the air duct body 90.

(67) The air guiding body 90 has a cylindrical or tubular shape and extends along the longitudinal axis L in the suction duct 45. The air guiding body 90 is rotatably mounted in the suction duct 45. The air guiding body 90 has a circumferential wall 91 on which through-flow openings 92, 93 are provided through which air can flow into an interior space of the air guiding body 90, namely into a flow channel 94. The outer circumference of the air guiding body 90 is provided with sealing contours 95, e.g. longitudinal ribs, which lie against the inner circumference of the suction duct 45 or at least are arranged close to this inner circumference. The sealing contours 95 separate the angular segments of the air guiding body 90 from each other, so to speak. One of the angular segments, for example, comprises the flow-through openings 92, another angular segment the flow-through openings 93. The other angular segments, which are separated from each other by the sealing contours 95, have no through-flow openings and are therefore flow-tight.

(68) By rotating the air guiding body 90 in the suction duct 45 about the axis of rotation D, the flow openings 92 can be positioned opposite the flow openings 68 assigned to the inlet openings 50 or 51 or 52, so that dust air S can pass through the respective inlet openings 50 or 51 or 52, the cross channels 58 and the flow openings 92 can flow into the flow channel 94 and flow further via the adjustment element 80 to the suction connection 11, where the dust air S can flow from a flow channel 17 of the connecting element 12 into the suction hose SL. A flow cross-section of this flow connection is thereby maximum.

(69) The air guiding body 90 thus forms a valve body or mask body 96, on whose rotary position in relation to the rotary axis D the flow cross-section depends, which is available for the respective inlet openings 50, 51 or 52 for extraction via the suction connection 11.

(70) A respective rotational position of the air guiding body 90 or the adjustment body 80 can be traced by means of at least one index 97, which is arranged, for example, on the outer circumference of the sleeve-shaped adjustment body 80. Also advantageous are symbols 98 for the respective processing surface sections 28, 29, 30 arranged on the adjustment body 80, especially close to the index or the indices 97. Thus, the operator can easily recognize which processing surface sections 28, 29, 30 are currently being suctioned off in the respective rotary position of the adjustment body 80 and the air guiding body 90, e.g. if only the flow openings 92 are present.

(71) The through-flow openings 93, on the other hand, are an option. The number or effective flow cross-section of the flow openings 93 is smaller than the number or effective cross-section of the flow openings 92. If the through-flow openings 93 are opposite the through-flow openings 68, suction is still possible via the inlet openings 50 or 51 or 52 assigned to the through-flow openings 68, but with a lower suction power or suction effect compared to suction via the through-flow openings 92.

(72) An embodiment is also possible in which the flow openings 92 or the flow openings 93, for example, or a combination of both, i.e. both the flow openings 92 and the flow openings 93, are positioned opposite the flow openings 68 assigned to a respective processing surface section 28, 29, 30. This means that the suction capacity can be changed in a total of 4 stages for each processing area 28, 29, 30: no flow, greater flow via the flow-through openings 93, even greater flow via the flow-through openings 92 and maximum flow via the combination of the flow-through openings 92 and 93.

(73) With the adjustment device 260 shown in FIGS. 8-11, an adjustment mimic arranged at the front in the vicinity of the suction connection 11 ensures that the dust air can flow through one of the 245, 246 or 247 suction ducts or that the flow cross-section of these 245, 246 or 247 suction ducts is released or closed. A mask body 296 of the adjustment device 260 is arranged between the suction connection 11 and the end face or on the end face of the processing body 220.

(74) The suction ducts 245, 246 or 247 run in a suction duct body 265 which extends along the longitudinal axis L in the processing body 220. The suction duct body 265 has a peripheral wall 266 which delimits a tubular interior in which partition walls 267 extending along the longitudinal axis and connected to each other, approximately in the centre of the suction duct body 265, are arranged. The partition walls 267, for example, are arranged in a star shape and separate the interior of the suction duct body 265, which is limited by the circumferential wall 266, into the suction ducts 245, 246 or 247. On the circumferential wall 266, passage openings 268 communicating with the suction ducts 245, 246 or 247 are provided, which are flow-connected with transverse ducts 58, which in turn communicate with the inlet openings 50, 51, 52 and thus with the processing surface sections 28, 29, 30. This means that each processing surface section 28, 29, 30 is assigned to one of the suction ducts 245, 246 or 247.

(75) On the basis of an adjustment element 280 of the adjustment device 260, one of the suction ducts 245, 246 or 247 can each be flow-connected to the suction connection 11, so that as a result one of the working surface sections 28, 29 or 30 is flow-connected to the suction connection 11 and a removal by suction for the respective processing surface section 28, 29 or 30 is available. The adjustment element 280 forms or includes the mask body 296.

(76) The adjustment element 280 rotates to accommodate the connection element 12 already described. For example, the adjustment element has a receptacle 283 in which the connection section 14 is rotatably mounted. A retaining projection 284, for example an annular retaining projection 284, arranged on the receptacle 283 engages in its recess 15 in the manner of the retaining projection 84, so that the connecting element 12 can be rotated with respect to its axis of rotation D, but cannot be pulled out of the receptacle 283 along the axis of rotation D. Thus the adjustment element 280 is mounted so that it can rotate relative to the suction hose SL, for example, or the suction hose SL is mounted so that it can rotate relative to the adjustment element 280.

(77) Furthermore, the adjustment element 280 is rotatably mounted relative to a connecting element 270, which is rotationally fixed with respect to the processing body 220 and the suction duct body 265. The connection element 270, for example, comprises a sleeve section 273, in which the suction duct body 265 is incorporated or in which it is inserted.

(78) For example, the connection element 270 projects in front of a cover 243 and is preferably integrally connected to this cover, which in principle corresponds to the cover 43 and covers the processing body 220 on the front side. The cover 243 has a passage opening 244.

(79) A bearing seat 278 for the adjustment element 280 is provided on connection element 270. The adjustment element 280 is rotatably mounted in the bearing seat 278. On the inner circumference of bearing seat 278, for example, there is a support projection 287 which engages in support seat 277 of adjustment element 280. The support projection 287 and the support seat 277 form a pull-out safety device or ensure that the adjustment element 280 can be rotated with respect to its axis of rotation D of the bearing seat 278, but cannot be pulled out of this bearing seat 278 along the axis of rotation D.

(80) The adjustment element 280 is supported by front support projections 282 at the bottom of the bearing seat 278, in particular on a ring-shaped bearing surface 275. In the area of the bearing surface 275, additional notches 279 are provided, at least one notch 279, which are or are intended for locking with one or more locking projections 289. The at least one locking projection 289 protrudes in front of the support projections 282 and engages in the respective adjustment positions of the adjustment element 280 in the locking recess 279. The elasticity of the locking projection 289 is preferably increased by the fact that it has a cavity 289A into which an arc-shaped section 289B of the locking projection 289 can become distorted.

(81) Symbols 98A and 98B and a further symbol not visible in the drawing are provided on the outer circumference of the sleeve-shaped adjustment element 280, for example its circumferential wall 291, which indicate the suction in relation to a processing surface section 28, 29 or 30.

(82) In the interior of the adjustment element 280 there is an end wall 295, at which a flow-through opening 292 and optionally a flow-through opening 293 are provided. The flow-through opening 292 has a large surface area and extends over an angular segment which corresponds to the flow cross-section of a suction duct 245-247. If the flow-through opening 292 is located frontally in front of one of the suction ducts 245-247 or is aligned with it, a maximum flow cross-section is available for the processing surface section 28-30 assigned to the respective suction duct 245-247. However, if the smaller cross-section of the flow-through opening 293 is located in front of a respective suction duct 245-247, the flow cross-section is smaller, i.e. the suction capacity is reduced. If the end wall 295 completely or partially covers one of the suction ducts 245-247, the processing surface section 28, 29 or 30 assigned to the suction duct is not suctioned or is suctioned with reduced suction capacity. The adjustment element 280 thus influences the effective flow cross-section, which is available for a suction of a respective processing section 28, 29, 30.

(83) The locking arrangement or the locking means with the locking projection 289 and the locking recess 279 is preferably designed in such a way that, in a respective locking position, the through-flow opening 292 is aligned with one of the suction ducts 245-247 in each case.

(84) A cross-section of the flow opening 292 is equivalent to a cross-section of a suction duct 245, 246, 247.

(85) A concept similar in principle to the adjustment device 260 has been selected for the 360 adjustment device, whereby the suction ducts 345, 346, 347 are separate tubes which pass through the processing body 320 parallel to the longitudinal axis L. The individual tubes can, for example, be integrally formed during the manufacturing process of the processing body 320, for example by foaming the base material 39 with a corresponding mould.

(86) Instead of a single mask body 296, one or more mask bodies 396, 496 can be provided, e.g. disc-like or drum-like mask bodies. The mask bodies 396, 496 are, for example, mounted so as to be rotatable with respect to the suction ducts 345, 346, 347 around an axis of rotation not visible in the drawing and extending parallel to the longitudinal axis L between the suction ducts 345, 346, 347. The rotation axis, for example, corresponds to the rotation axis D already explained.

(87) The mask body 396, for example, has a flow-through opening 392 and preferably another flow-through opening 393, which can be aligned with the suction ducts 345, 346, 347 by rotation about the aforementioned axis of rotation. Thus, the mask body 396 therefore forms an adjustment element 380.

(88) In FIG. 13, for example, the through-flow opening 392 is aligned with the suction duct 347, while the through-flow opening 393 is aligned with the suction duct 346, thus providing a smaller flow cross-section there. Accordingly, the processing surface section 30 is suctioned off with higher suction capacity than the processing surface section 29. FIG. 14 shows the mask body 396 rotated counter-clockwise so that the through-flow opening 392 is only partially in front of the suction duct 347, i.e. the suction capacity or the flow cross-section is reduced there. In FIG. 15, the through-flow opening 392 is aligned with the suction duct 346, so that maximum suction capacity is available at the processing surface section 29, while the suction at the processing surface section 30 is switched off, so to speak.

(89) It can be seen that an infinitely variable adjustment of a suction capacity or a flow cross-section would be possible by means of the mask body 396 alone, namely that the mask body 396 or the adjustment element 380 can stand not only in such setting positions in which the through-flow opening 392 is aligned with one of the suction ducts 345, 346, 347, but also in intermediate positions in which the through-flow opening 392 only partially stands in front of one of these suction ducts and enables a reduced through-flow of the respective suction duct through the suction flow S.

(90) The possibilities for adjustment the suction capacity on one or more of the processing surface sections 28, 29 or 30 can be improved by the additional mask body 496. This has, for example, a flow-through opening 492 which, by rotating the mask body 496 relative to the suction ducts 345, 346, 347 and relative to the flow-through openings 392 and optionally 393, makes it possible to adjust variable flow cross-sections between the suction connection 11 and the suction ducts 345, 346 and 347.

(91) A processing body 420 (FIG. 16) is designed as a stepped body. For example, the processing body 420 has partial processing bodies 420A, 420B with different cross-sections. Both partial processing bodies 420A, 420B are arranged immediately adjacent to each other or adjacent to each other, wherein a step 418 is provided between the two partial processing bodies 420A, 420B. The partial processing bodies 420A, 420B can be made in one piece or from one piece.

(92) The partial processing bodies 420A, 420B have the same cross-sectional geometry in the embodiment shown in FIG. 16, but different cross-sectional area dimensioning. As a result, curved portions 427A, 427B of the partial processing bodies 420A, 420B have the same basic geometric contours, but different radii.

(93) The partial processing bodies 420A, 420B have curved portions 427A, 427B which geometrically correspond to the curved portion 27, and flat surface portions 426A, 426B which geometrically correspond to the flat surface portion 426.

(94) In principle, it would be possible for the partial processing bodies 420A, 420B to be coaxial with respect to a longitudinal axis that passes through their respective cross sections in the middle. However, an embodiment has been selected in which the flat surface portions 426A, 426B of the partial processing bodies 420A, 420B merge with one another over their entire surface, i.e. merge with one another without a step, so that a continuous flat surface portion 426 is formed.

(95) However, the stage 418 is provided between the curved portions 427A, 427B of the partial processing bodies 420A, 420B.

(96) In addition, the configuration of processing body 420 is such that processing surfaces 422A, 422B of partial processing bodies 420A, 420B are aligned with each other at least in a transition region 438 corresponding to transition region 38 with respect to the flat surface portion 426, while stage 418 is formed between processing surfaces 423A, 423B, which in principle conform to the processing surfaces 23 already described, and between the transition regions 437A, 437B, which in principle correspond to transition region 37. Again, this offset or stage 418 can also be provided between the processing surfaces 422A, 422B if the partial processing bodies 420A, 420B are arranged differently relative to each other transversely to a longitudinal axis LA of the processing body 420 (not shown).

(97) A suction system is preferred for the processing body 420, i.e. for example the connection element 12 with the connection section 13 is arranged on the processing body 420, especially on the partial processing body 420A with a smaller cross-section. However, it would also be possible to provide such a suction connection on the other partial processing body 420B with a larger cross-section.

(98) The abrasive material 124, for example a grit, a granular structure, a knitted fabric or the like, can be arranged directly on the processing body 420, in particular the processing surfaces 423A and/or 423B and/or 422A and/or 422B.

(99) It is also possible that the processing body 420 has, for example, a holding means 480 comparable to the holding means 40 in the region of the processing surfaces 423A and/or 423B and/or 422A and/or 422B to which an abrasive or polishing agent, for example an abrasive sheet, polishing material, polishing knitted fabric or polishing cloth or the like, can be detachably fastened.

(100) It is possible that different surface textures are provided on the processing surfaces 423A, 423B, 422A, 422B, e.g. a holding agent on one of the processing surfaces, a polishing material on another and a polishing knitted fabric on another processing surface.