DEVICE FOR TREATING THE HAIR

Abstract

A device for treating the hair, having two hair treatment jaws that are movable relative to one another between a spaced-apart configuration and a moved-together configuration, an internal treatment member having an internal heating surface, which extends over one of the jaws towards the other of the jaws in the moved-together configuration and is configured to come into contact with the hair extending between the jaws, at least one internal treatment member having a first lateral edge and an opposite second lateral edge, the first lateral edge being configured such that an angle formed between a median plane of the device, extending between the jaws in the moved-together configuration of the jaws, and hair under mechanical tension, bearing on the first lateral edge, and on an outer surface of the corresponding jaw, adjacent to and separated from the internal treatment member, is less than or equal to 120, and strictly greater than 90.

Claims

1. A device for treating the hair, comprising: two hair treatment jaws that are movable relative to one another between a spaced-apart configuration for inserting hair to be treated between said jaws and a moved-together configuration for treating the hair, an internal treatment member having an internal surface for heating the hair to be treated, which extends over one of the two jaws towards the other of the jaws in the moved-together configuration of the two jaws and is configured to come into contact with the hair extending between the two jaws in the moved-together configuration thereof, the internal treatment member having a first lateral edge and a second lateral edge opposite to the first lateral edge, the first lateral edge being configured such that an angle formed between a median plane of the device, extending between the jaws in the moved-together configuration of the jaws, and hair under mechanical tension, bearing on the first lateral edge of the corresponding internal treatment member, and on an outer surface of the jaw bearing the internal treatment member, adjacent to and separated from the corresponding internal treatment member, is less than or equal to 120, and strictly greater than 90.

2. The device according to the claim 1, in which the angle formed between the median plane of the device and hair under tension is less than or equal to 110 and greater than or equal to 95.

3. The device according to the claim 1, in which the angle formed between the median plane of the device and hair under tension is equal to 1055.

4. The device according to claim 1, having two internal treatment members that each extend over one of the jaws and each have at least one internal heating surface, the internal heating surfaces facing one another and being configured to grip the hair between one another in the moved-together configuration of the jaws.

5. The device according to claim 1, wherein the first lateral edge is closer to the outer surface of the jaw bearing the internal treatment member that is adjacent thereto than the second lateral edge is to the outer surface of said jaw that is adjacent thereto.

6. The device according to claim 1, wherein the or each internal treatment member has an internal plate extending between the jaws having a contact surface with the hair, the contact surface with the hair forming the internal heating surface, the internal treatment member or members being mounted on the corresponding jaw by being inserted into a housing of the jaw that opens towards the other jaw.

7. The device according to claim 6, wherein the, at least one or each internal treatment member is asymmetric with respect to a median plane of the housing of the corresponding jaw, orthogonal to the median plane of the device extending between the jaws in the moved-together configuration of the jaws.

8. The device according to claim 6, wherein at least one of the internal plates or each of them protrudes laterally from the abovementioned support at the first lateral edge by a distance greater than or equal to 1 mm, and/or less than or equal to 3 mm.

9. The device according to claim 1, wherein the, at least one or each internal treatment member is spaced apart from a plane lying laterally on the outer surfaces of the two adjacent jaws and separated from the corresponding internal treatment member by a distance at rest less than or equal to 6 mm.

10. The device according to claim 1, wherein the first lateral edge of the internal treatment member or of at least one of the internal treatment members has an edge corner configured to come into contact with the hair under tension bearing on the first lateral edge and the adjacent outer surface of the jaw bearing the internal treatment member.

11. The device according to claim 1, having at least one external treatment member for heating the hair to be treated that extends over one of the two jaws towards the exterior of the jaws.

12. The device according to claim 1, having an additional hair treatment member that extends from one of the two jaws towards the other jaw in the moved-together configuration of the two jaws, and is arranged on said jaw laterally in the moved-together configuration of the jaws with respect to the internal treatment member.

13. The device according to claim 1, including a recess in the jaw between the first or second lateral edge of the internal treatment member and the outer surface of the jaw carrying the corresponding internal treatment member and adjacent to the corresponding internal treatment member.

14. The device according to claim 1, wherein the first lateral edge may extend so that it forms a protruding lateral relief.

15. The device according to claim 7, wherein the, at least one or each internal treatment member is asymmetric exhibits a transverse distance between the first lateral edge and the transverse median plane (P1) of the housing greater than that between the second lateral edge and the transverse median plane of the housing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0113] The invention may be understood better from reading the following detailed description of non-limiting exemplary embodiments thereof and from examining the appended drawing, in which:

[0114] FIG. 1 illustrates a perspective view of an example of a device according to the invention,

[0115] FIG. 2 illustrates a perspective view of the distal end of the device in FIG. 1,

[0116] FIG. 3 illustrates a view in cross section of an example of a device according to the invention,

[0117] FIG. 4 is an enlarged view of FIG. 3 in the region of the treatment member,

[0118] FIG. 5 illustrates a perspective and partial view of the distal end of the device in FIG. 1,

[0119] FIG. 6 is an enlarged view of FIG. 3,

[0120] FIG. 7 illustrates an enlarged view of an edge of one of the internal plates of the device in FIG. 3, and

[0121] FIG. 8 illustrates, in isolation, the internal plates and the housings of the device in FIG. 3.

DETAILED DESCRIPTION

[0122] In the rest of the description, elements that are identical or have identical functions bear the same reference signs. For the sake of conciseness of the present description, they are not described for each of the figures, only the differences between the embodiments being described.

[0123] FIGS. 1 and 2 show an example of a hair treatment device 2 according to the invention.

[0124] This device 2 has two jaws 3 and 4 that are movable with respect to one another between a spaced-apart configuration (not shown) for the introduction of a lock of hair between said jaws, and a moved-together treatment configuration, illustrated in FIG. 1.

[0125] The jaws 3 and 4 are carried by an upper arm 5 and a lower arm 6, respectively, which, in the example in question, are connected together at their ends by a hinge 8, the device 2 thus forming tongs.

[0126] The arms 5 and 6 define, between the hinge 8 and the jaws 3 and 4, respective half-handles 10 and 11 on which the user can press in order to move the jaws 3 and 4 together and thus grip the hair extending between the two jaws.

[0127] The width of the arms 5 and 6 at the half-handles 10 and 11 is less than that at the jaws 3 and 4. In a variant, the widths could be substantially identical, or the width of the arms 5 and 6 at the half-handles 10 and 11 could even be greater than that at the jaws 3 and 4.

[0128] The jaws 3 and 4 each have a convex outer surface and a substantially planar inner surface.

[0129] An elastic return member (not visible) is preferably provided to return the jaws 3 and 4 to the spaced-apart configuration, this elastic return member being for example a spring disposed around a pin of the hinge 8.

[0130] The invention is not limited to a particular manner of connecting the arms 5 and 6 together and the jaws 3 and 4 may be rendered movable in some other way without departing from the scope of the present invention. However, the presence of a hinge is largely preferred for the ergonomics it provides.

[0131] The device 2 extends, for example, along a longitudinal axis X. The device 2 has a line 17 designed to be able to supply the energy necessary for operation of the device. The line 17 may thus be an electric cord designed to connect the device to the electric mains. Without departing from the scope of the invention, the line could also be a fluidic line designed to supply the device with fluid (water for example).

[0132] The device may have a water reservoir for the production of steam.

[0133] A user interface (not shown in the figures) may be present on the device 2 in order to allow the user to control the operation of the device.

Heating Plates

[0134] The device 2 has an internal surface 45 for heating hair to be treated on each of the two jaws 3 and 4 facing the other of the jaws, and facing one another in the moved-together configuration of the jaws 3 and 4 so as to define, between one another, a heated treatment zone in the moved-together configuration of the two jaws 3 and 4. The two internal heating surfaces 45 are, for example, configured to grip between one another the hair extending between the two jaws 3 and 4 in the moved-together configuration of the two jaws 3 and 4.

[0135] The two internal heating surfaces 45 are substantially planar, but do not have to be. They could have complementary wavy shapes or complementary curved shapes for example.

[0136] The internal heating surfaces are, in the example illustrated, formed by the contact surface of internal plates 16 made of a heat conducting material that each extend over one of the jaws. Each internal plate 16 constitutes an internal treatment member of the device.

[0137] In a variant that is not illustrated, only one of the jaws 3 or 4 may bear an internal plate 16 having a heating contact surface facing a counter-bearing surface of the other jaw 3 or 4. The counter-bearing surface may be formed by the body of the jaw or by an element attached to the jaw.

[0138] In the example illustrated, the internal plates 16 are each mounted in the cavity 30 of a support 9, which itself is mounted in a housing 38 of the corresponding jaw 3 or 4. The internal plates 16 are each mounted fixedly on the support 9. At least one of the supports 9 is mounted so as to be movable in its housing, as will be set out below. In a variant that is not illustrated, the internal plates may be mounted directly in the housing and optionally be movable in the corresponding housing, or the internal plates may be mounted on the support while being movable in the cavity, the support being fixed in the housing.

[0139] At least one of the supports 9 is movable perpendicularly to the longitudinal axis of the jaw in its housing 38, between a high position spaced apart from the bottom of the housing and a low position moved together therewith.

[0140] The travel of the support 9 and the tilting thereof advantageously make it possible to position the internal heating surface 45 in the closed position of the device, such that the hair is gripped substantially uniformly and effectively during the treatment between the internal heating surfaces, thereby improving the straightening of the hair by the device.

[0141] The support 9 bears against a support means 140 that extends in the housing 38, allowing the support to carry out a tilting movement and, in the open position of the arms 5 and 6, keeping the support 9 in the high position.

[0142] The support means 140 may have one or more springs 141, in particular a spring as illustrated, extending between the bottom of the housing 38 and the support 9, or a leaf spring fixed in an indentation in the support 9 or in the bottom of the housing 38. The support means may, in a variant or additionally, have a protruding relief between the support 9 and the bottom of the housing 38, allowing the tilting movement and limiting the travel of the support in the housing. For example, in the example illustrated, the support means has a ball joint compressed by a spring, as is described in the patent application FR3011449.

[0143] The support 9 that is movable perpendicularly to the longitudinal axis may have a peripheral seal 33 providing sealing between the support 9 and the housing 38 while allowing the support 9 to move in the housing, as was described above. Such a seal allows in particular the sealing of the housing with respect to the steam output by one or more steam outlets, as will be described below.

[0144] The device 2 may also have two external surfaces, formed by external plates 13, for heating the hair to be treated, which each extend over one of the two jaws 3 and 4 towards the exterior of the device 2 in the moved-together configuration of the two jaws 3 and 4, in particular over the convex outer surface of the jaw 3 or 4, and are on opposite sides from one another on the device 2 in the moved-together configuration of the jaws 3 and 4.

[0145] Each external plate 13 is disposed on a face of the corresponding jaw 3 and 4 that faces away from the face receiving the internal plate 16 borne by the same jaw 3 or 4.

[0146] In the example illustrated, the external plates 13 are made of stainless steel and the internal plates 16 are made of aluminium. However, other materials that are good conductors of heat, in particular other metals, could be used.

[0147] The external plates 13 may be metal sheets that are flexible or preformed so as to have a convex shape complementary to the external surface of the jaw 3 and 4.

[0148] The external plates 13 may be in one-piece.

[0149] The external plates 13 may be free of any projecting combing teeth.

[0150] The width of the jaw 3 at the level of external plates 13 may be smaller than the width of the other jaw 4 at the same level.

[0151] The external plates 13 may extend laterally over the entire width of the jaw 3 and 4.

[0152] The side edges of the jaw 3 may extend laterally strictly between the side edges of the other jaw 4 over the entire length of the external plates 13, in particular the side edges of the other jaw 4 faces a hollow zone of the jaw 3

[0153] The external plates 13 are fixed to the jaw 3 or 4 by any suitable means. For example, the external plates 13 have longitudinal edges 90 that are curved inwardly and configured to each be fixed in a groove or a corresponding lateral housing 91 of the corresponding jaw 3 or 4.

[0154] The external plates 13 and the internal plates 16 are preferably elongate along the longitudinal axis Y1 or Y2 of each of the jaws 3 and 4.

[0155] The external plates 13 and the internal plates 16 are at least partially superposed on one another along an axis perpendicular to the longitudinal axis X of the device 2. The internal plates 16 extend between the two side edges of the external plates 13.

[0156] The device 2 may, as illustrated, have a distal portion, at the opposite end from the hinge 8, which does not have a heating plate. This distal part may be domed and be wide enough to be able to be grasped by a hand, in particular while the device 2 is being used.

[0157] The internal plates 16 may be heated at a temperature greater than 50 C., better still between 90 C. and 230 C.

[0158] The external plates 13 may be heated at a temperature greater than 50 C., better still between 60 and 100 C.

[0159] In the example illustrated, the internal plate 16 and the external plate 13 borne by the same jaw 3 or 4 are heated by thermal conduction by a single heat source 14 extending in said jaw and visible in FIG. 3. However, this does not have to be the case, and the device 2 could in particular have several heat sources, respectively for the internal plates and the external plates.

[0160] In the example illustrated in FIG. 3, each internal plate 16 has a first lateral edge 31 and a second lateral edge 36 opposite to the first edge 31, the edges 31 and 36 extending parallel to the longitudinal axis Y1 or Y2 of the corresponding jaw. The internal plates may be off-centre on the corresponding jaw such that the first edge 31 is closer to the adjacent lateral edge 100 of the corresponding jaw than the second edge 36 is to the adjacent lateral edge 101 of the corresponding jaw.

[0161] The internal plates 16 may protrude beyond the housing 38 laterally on both sides of the jaw and have a lateral extension defining the first lateral edge 31 that is longer in cross section of the device than the lateral extension defining the second edge 36.

[0162] As illustrated in FIG. 6 for the jaw 3, the first edge 31 may be configured such that, when the spring 141 is not compressed, an angle formed between a median plane Z of the device 2 extending between the jaws 3 and 4 in the moved-together configuration of the jaws 3 and 4 and hair under tension bearing on the first edge 31 of the internal plate 16 and on an adjacent outer surface of the jaw 3 or 4 bearing the internal plate, illustrated by the plane C, is less than or equal to 120 and strictly greater than 90, better still equal to 1055, better still equal to 1053, notably at rest, for example equal to 105.

[0163] As visible on FIG. 6, the device 1 comprises a groove between the first lateral edge 31 of the internal plate 16 and said adjacent outer surface of the jaw 3 or 4 bearing the internal plate 16 and that extends substantially along the longitudinal axis of the corresponding.

[0164] Said adjacent outer surface is offset from the internal plate 16 by a non-zero distance when the device 1 is viewed along its longitudinal axis.

[0165] The first lateral edge 31 extend so that it forms a protruding relief on the jaw 3 or 4.

[0166] The internal plates 16 may protrude laterally at rest from the housing 38 at the first edge 31 only by a width Ls of 1 mm.

[0167] As illustrated in FIG. 6, each internal plate 16 may be spaced apart, at rest, from a plane P lying laterally on the adjacent outer surface of the two jaws 3 and 4 by a distance Dp less than or equal to 6 mm, better still less than or equal to 5.5 mm.

[0168] The first edge 31 of the internal plate 16 of the jaw 3 may have an edge corner 40 configured to come into contact with hair under mechanical tension during the treatment. This hair is depicted by the plane C lying on the first edge 31 of the internal plate 16 and on an adjacent outer surface of the jaw 3. The edge corner 40 may be rounded with a radius of curvature equal to 1.5 mm.

[0169] The support 9 may protrude, at rest, from the jaw 3 or 4 in the direction of the other jaw 3 or 4 by a height H1 of at least 2 mm, for example 4 mm.

[0170] This distance makes it possible to avoid contact between the surface of the plate protruding beyond the support 9 of the plate and the surface of the jaw bordering the housing 38 facing said surface of the plate during the movement of the support 9 in the housing 38 via the spring 141.

[0171] As illustrated in the enlarged view in FIG. 7, the first edge 31 having the edge corner 40 may have a second, planar part 122 that is oriented away from the jaw 4. This part 122 is parallel to the surface 45 of the internal plate 16.

[0172] The second part 122 extends, for example, from the edge corner 40 to a rib 125 of the internal plate 16, this rib 125 engaging in the seal 33 of the support 9 of the jaw 3.

[0173] Each internal plate 16 has a plurality of these ribs 125, as illustrated in FIG. 8. For example, a rib 125 is formed by a curve in the internal plate 16 at its second edge 36.

[0174] The thickness Eb of the first edge 31 bearing the edge corner 40 is less than the thickness Ep of the internal plate 16, away from the various ribs 125.

[0175] As illustrated in FIG. 8, each internal plate 16 has a cavity 130 configured to receive the heating element 14. This cavity 130 is formed by two parallel walls 131 extending orthogonally to the surface 45 and a wall 132 connecting the two walls 131.

[0176] For example, as illustrated in FIG. 8, each wall 131 has reliefs 135 that help to keep the internal plates 16 on the support 9.

[0177] As illustrated in FIG. 8, the first edge 31 of the internal plate 16 of the jaw 4 is not in contact with the support 9, unlike the second edge 36.

[0178] The first edges 31 and the second edges 36 are, for example, offset transversely from one another by a non-zero distance Db.

[0179] The first edge 31 of the internal plate 16 of the jaw 4 may be curved without having a protruding edge corner.

[0180] The second edges 36 of the internal plates 16 of the jaws 3 and 4 do not extend laterally with respect to the housings 30 and are curved so as not to have a protruding edge corner.

[0181] The position and the shape of the first edges 31 and in particular of the edge corner 40 allow, during curling, an improvement in the result since it increases the bending angle of the hair and produces, on passing over the edge corner 40, an effect equivalent to that obtained by a protruding edge corner passing at a particular angle over a gift ribbon.

[0182] Moreover, since the internal plates 16 protrude beyond their support 9, the first edge 31 is closer to the adjacent external surface 32, making it possible to move closer to the roots of the hair to be treated compared with appliances of the prior art.

[0183] The radius of curvature with respect to the longitudinal axis Y1 of the external plate 13 of the jaw 3 may be smaller than that of the external plate 13 of the jaw 4 with respect to the longitudinal axis Y2.

External Guiding Portion

[0184] In the examples illustrated, each jaw 3 and 4 has an external hair guiding portion delimited longitudinally, on each of its two sides, by a stop surface 18 formed by a shoulder. The external hair guiding portion is defined, for example, by the external plates 13.

[0185] The stop surface 18 may comprise a flat portion, particularly in a plane transverse to the jaw, particularly flat over a width at least equal to 50% of the width of the jaw, preferably 80% of the width of the jaw, better still 100%, at the level of said stop surface 18.

[0186] The shoulders 18 may have a variable height He, for example varying between 0.5 mm on the external surface of the jaw extending laterally with respect to the internal plate 16 and 2 mm on the external surface of the jaw opposite to the internal plate 16.

[0187] Each shoulder 18 may be formed by ribs delimiting the external hair guiding portion. The rib is, preferably, thicker on the opposite side from the internal plates 16 than on the sides of the internal plates 16.

[0188] Each external guiding portion is set back with respect to the base level of the jaw 3 or 4, defined as the level of the jaw 3 or 4 away from the shoulders 18. Thus, each guiding portion has a visible width 11 and 12, illustrated in FIG. 3, that is smaller than and set back from the rest of the jaw 3 or 4.

[0189] The external plates 13 may extend along the entire length of the external guiding portion.

[0190] One of the jaws may have a lateral recess 170 at the corresponding guiding portion. The recess 170 may be delimited laterally by the stop surfaces in the proximal and distal part of the jaw delimiting the guiding portion. These stop surfaces form, at the shoulder, guiding surfaces 20 with a greater height, making it possible to keep the hair in the recess 170. The recess 170 extends laterally with respect to the jaw and faces a part of the other jaw 3 or 4. As a result, a part of the internal surface 16 of the other jaw 3 or 4 gives onto the recess 170, making it possible to have at least a part of an additional treatment member extending from the other jaw into the recess 170, in particular a comb, as will be shown below, and affords new treatment possibilities. Preferably, the recess 170 has a uniform depth along the longitudinal axis of the device X such that the outer surface of the jaw has a substantially cylindrical shape along the recess 170, meaning that it has an identical cross section along the recess 170.

[0191] There is preferably no lateral recess on the other side of said jaw.

[0192] On account of the presence of the recess 170, the width 11 of the jaw bearing the recess is smaller at said recess 170 than the width 12 of the other jaw facing said recess 170.

[0193] The width 11 is between 30 mm and 50 mm and is, for example, equal to 38 mm. The width 12 is between 40 mm and 60 mm and is, for example, equal to 47 mm.

Additional Treatment Member

[0194] In the examples illustrated, the device 2 has an additional hair treatment member 12 that extends from the jaw 4 towards the other jaw 3 in the moved-together configuration of the two jaws 3 and 4 and is arranged on said jaw 4 laterally with respect to the internal plate 16.

[0195] The additional treatment member is only present on the internal part of the jaw 4. The external parts of the jaws, 3 and 4 are deprived of any additional member other than the external plate 13.

[0196] The member 12 extends longitudinally and parallel to the longitudinal axis Y2 along the second edge 36, opposite to the first edge 31, of the internal plate 16 of the jaw 4, being separated from this internal plate 16, when the device 2 is viewed along its longitudinal axis X.

[0197] The member 12 may have a steam outlet 21 and a comb 22, as illustrated in FIG. 3.

[0198] The comb 22 may be disposed, removably, in a housing such as a longitudinal groove 35, visible in FIG. 2. The user can thus change or remove the comb 22 as desired.

[0199] The groove 35 may have a rectangular cross section and open out at the distal end of the jaw 4.

[0200] The comb 22 may have, in the distal part of the device 2, an element 46 that makes it possible to grasp the comb 22 when it is being introduced into the groove 35 or extracted therefrom.

[0201] The comb 22 may extend, for example, along the entire length of the guiding portion. In a variant, it could extend over only a part of the guiding portion.

[0202] The steam treatment may be ensured by virtue of a vaporization member formed by an element heating an evaporation chamber 19 supplied with water by a reservoir situated in one arm of the device, or, in a variant, by a remote reservoir. The device may have an electrically driven pump, preferably a peristaltic pump, that draws up the water to be sent to the device 2 from a reservoir of water. The pump is for example as disclosed in the publication FR 2 967 018. The evaporation chamber may be produced in accordance with the teaching in the application EP 2449909A1 or in a different way. The evaporation chamber 19 may be disposed on one of the arms, namely the lower arm 6 in the example in question, and the steam outlet 21 is provided on the same arm 6.

[0203] The steam outlet 21 may be in the form of a strip, with a shape that is elongate in a direction parallel to the longitudinal axis Y2.

[0204] The strip may have several orifices for spraying steam, for example between 4 and 10 orifices, preferably 7, which are preferably distributed evenly along the strip and each have an axis oriented substantially perpendicularly to the median treatment plane.

[0205] The vaporization member is electrically powered and a temperature sensor is advantageously disposed in the evaporation chamber 19. The device is designed to keep the temperature of the evaporation chamber at a value of between 110 C. and 130 C.

[0206] The steam produced which passes out of the outlets 21 is partially contained between the steam outlet 21, the internal heating plates 16 and the other jaw 3, in particular by virtue of the presence of a containment groove 500, visible in FIG. 3. This partial containment improves the application of the steam to the hair.

[0207] The comb 22 may be disposed facing the recess 170 of the other arm 5, illustrated in FIG. 2, such that the end of its teeth are accommodated in the recess 170.

[0208] The comb 22 may be arranged on the jaw 4 such that the distal end 23 of the teeth of the comb is spaced apart by a non-zero distance from hair wound around the two jaws 3 and 4.

[0209] To this end, the comb 22 is configured such that, for any cross section of the device in the moved-together configuration of the jaws, for example that in FIG. 4, the tangent T, which may for example fictitiously represent the hair, to the two jaws 3 and 4, extending on the side of the device bearing the comb 22, is at a distance from the comb 22.

[0210] The smallest distance Dd between the distal end 23 of the teeth of the comb 22 and the tangent T may be greater than or equal to 0.5 mm, better still greater than or equal to 1 mm, for example equal to 3 mm.

[0211] When the user winds hair around the jaws 3 and 4, in particular when curling, the hair under tension follows, between the two jaws 3 and 4, the tangent T. Thus, the wound hair does not pass through the comb 22, making the styling operation easier.

[0212] The distal end 23 of the teeth of the comb 22 is, for example, offset laterally, in the moved-together configuration of the jaws 3 and 4, from the opposite jaw 4, in this case from the jaw at the recess 170 by a distance Dde greater than or equal to 0.5 mm, preferably greater than 1 mm. This ensures that the teeth of the comb 22 cannot interfere with the jaw 4 at the recess 170.

[0213] The height Hde of the teeth of the comb 22 may be between 5 mm and 15 mm, preferably between 7 and 10 mm, for example around 8 mm.

[0214] The teeth of the comb 22 may have a rectangular cross section.

[0215] In the example illustrated, the combination of the external guiding portion, of the edge corner 40 and of the heat from the external plates 13 produces high-quality curling of the hair.

[0216] In addition, the device 2 may also operate as a straightener, without any loss of straightening quality compared with a conventional device dedicated only to straightening the hair.

Methods

[0217] To curl or straighten hair with the aid of the device 2, a lock of hair can be moved over the device 2 between the internal plates 16 and/or by passing over one external plate or the external plates 13, passing or not passing through the treatment member 12.

[0218] The hair treatment method for curling may involve the movement of the device 2 along a lock of hair from the root to the tips to carry out the following successive steps: [0219] a. A treatment of the lock of hair with the member 12, in order to comb the hair in the comb 22 and to apply steam via the outlet 21, and [0220] b. A first thermal treatment of the lock of hair by contact between the internal plates 16 of the device 2. [0221] c. A second thermal treatment of the lock of hair applying tension against the external plate 13 of the jaw 3.

[0222] Preferably, the lock of hair undergoes a change in orientation about the device 2 of at least 270 during the treatment.

[0223] At the end of step b of thermally treating the hair between the internal plates 16, the lock of hair undergoes, between the first edge 31 and the adjacent external surface 32 of the jaw 3 around which the lock of hair is wound, a change of orientation of 100.

[0224] At the end of step b of heating the hair on the internal plates 16, the hair is moved over the edge corner 40, making it possible to produce the abovementioned gift ribbon effect. Another application of heat on the external plate 13 of the jaw 4 could also be carried out.

[0225] During step c, the hair is correctly contained in the external guiding portion by virtue of the recess 170 and the shoulders 18.

[0226] In the case of a hair treatment method for straightening, this may involve the movement of the device 2 along a lock of hair from the root to the tips to carry out the following successive steps: [0227] a. A treatment of the lock of hair with the member 12, in order to comb the hair in the comb 22 and then to apply steam via the outlet 21, and [0228] b. A first thermal treatment of the lock of hair by contact between the internal plates 16 of the device 2.

[0229] The invention is not limited to the examples that have just been described.

[0230] The device may have a cosmetic product applicator member that is or is not removable, having a porous element configured to come into contact with the hair between the jaws in the moved-together configuration of the latter.