FR3091156A1 - Hair removal head for hair removal device with a single row of tweezers - Google Patents

Abstract

The present invention relates to a hair removal head for a hair removal device provided with an electric motor, comprising a roller (1) having: a central shaft carried by a longitudinal axis and comprising at least one cam having at least one groove, a substantially cylindrical cage of revolution about the longitudinal axis, intended to be rotated about the longitudinal axis by the electric motor, a plurality of tear rows arranged at the periphery of the cage, each tear row comprising a single pull-out clamp movably mounted on the cage and guided by at least one groove of the cam, each pull-out clamp comprising a single pull-out blade, a plurality of longitudinal bars (17) arranged respectively opposite the plurality of tearing rows radially outward, each longitudinal bar (17) comprising a through hole (18) having a support element extending radially with respect to said bar head (17), the tear-off blade of the tear-off pliers of the corresponding tear-off row being arranged to pass through said through orifice (18) and to come to bear on the support element so as to alternately pinch bristles on the support element and release them during the rotation movement of the cage (10) relative to the central shaft in which the through holes (18,18 ') of two adjacent bars (17,17' ) are offset longitudinally and have an overlap delimiting a circumferential epilation zone. Reference figure for the abstract: Figure 1

Description

Description

Title of the invention: Hair removal head for a hair removal device having a single row of tweezers

Technical area

The present invention relates to the field of epilators or epilators and more particularly epilation heads for faces and sensitive areas, mounted on an epilator.

Prior art

An electric hair removal device generally comprises tongs arranged on a rotary roller, the tongs being brought mechanically during the rotation of the roller to close and open periodically so as to tighten the hairs close to the skin in order to pluck then evacuate the plucked hairs.

An example of such a device is given in document LR2923685. The depilation device described comprises tear-off pliers formed by several rows of movable blades in translation coming to bear against fixed bearing zones opposite, all the movable blades of a row being carried by a rotary cylinder . The movable blades are linked to lugs which, when the rotary cylinder is rotated about a central axis, cooperate with a cam having grooves made on the periphery of a fixed central shaft. The movement of the movable blades makes it possible to pinch several hairs simultaneously over the entire length of the row. However, this device is not suitable for use on all parts of the body, especially on a face or on sensitive areas, more difficult to access and / or thinner.

The documents LR 2 858 528 and LR 2 923 685 also describe epilation heads for a depilatory appliance with plucking forceps driven by an electric motor comprising a roller, on the periphery of which are arranged rows of pliers, formed by blades actuated by the rotation of the roller. Similarly, these devices do not allow access to sensitive areas or very localized hair removal.

Statement of the invention

An object of the invention is to remedy at least in part the aforementioned drawbacks and to propose a depilation head for a depilatory device with pliers of simplified structure which can be assembled in an automated manner, and allowing a localized use on all areas to be epilated, even the most difficult to access or the smallest.

These objects are achieved with a depilation head for a depilatory appliance provided with an electric motor, comprising a roller having:

a central shaft carried by a longitudinal axis and comprising at least one cam having at least one groove,

- a substantially cylindrical cage of revolution around the longitudinal axis, intended to be rotated around the longitudinal axis by the electric motor,

- A plurality of rows of tear-out arranged on the periphery of the cage, each row of tear-off comprising a single tear-off clamp movably mounted on the cage and guided by at least one branch of the cam, each tear-off clamp comprising a single tear blade,

- A plurality of longitudinal bars arranged respectively opposite the plurality of tear rows radially outward, each longitudinal bar comprising a through hole having a support element extending radially relative to said bar, the blade d pulling out the pulling pliers of the corresponding pulling row being arranged to pass through said through hole and to come to bear on the support element so as to alternately pinch hairs on the support element and the release during the movement of rotation of the cage relative to the central shaft in which the through holes of two adjacent bars are offset longitudinally and have an overlap delimiting a circumferential epilation zone.

The fact that each tear-off row comprises a single tear-off pliers itself having a single tear-off blade combined with the fact that the through orifices of two adjacent bars are longitudinally offset and have an overlap is particularly advantageous since this enables a depilation head having a narrow circumferential depilation zone, thus allowing the user to perform precise depilation.

The proposed epilation head may include the following characteristics, taken alone or in combination:

each tear-off clamp comprises a base on which the tear-off blade is mounted, said base comprising a lug traversing the cam groove of the central shaft, and the tear-off clamp further comprising a guide blade mounted on the base ;

- Each bar further comprises a blind hole intended to receive a free end of the guide blade, so as to confine said guide blade inside the epilation head;

- The tear blade of each tear pliers is arranged inclined in the direction of the support element of the orifice passing through the corresponding bar;

- The support element extends radially relative to the bar with a thickness greater than 1 mm, for example of the order of 1.4 mm;

the through orifice also has an element opposite the support element, the opposite element and said support element extending radially with respect to the bar on either side of the through orifice, wherein an opening width is defined between the element opposite the support element and said support element, and the opening width being less than 3 mm, preferably less than 2.5 mm;

- a functional opening width is obtained by subtracting from the opening width a thickness of the tear blade, the functional opening width being less than 2 mm.

According to an exemplary embodiment, the support elements of two adjacent bars are longitudinally on the same side of the corresponding through holes. An overlap width is defined as the shortest distance in the longitudinal direction between a support element of a bar and an element opposite to a support element of an adjacent bar, and preferably a ratio between the width of overlap and the opening width is less than 0.5, preferably about 0.35.

According to another embodiment, the support elements of two adjacent bars are longitudinally of opposite sides of the corresponding through holes. An overlap width is defined between the support elements of two adjacent bars, and preferably a ratio between the overlap width and the opening width is less than 0.5, preferably approximately equal to 0.35.

The epilation head described above may also have a width of the circumferential epilation zone of between 0.5 mm and 1.5 mm, preferably between 0.7 mm and 1 mm, more preferably of the order of 0.8 mm.

The epilating head may further comprise a support configured to hold the roller and comprising two lateral flanges, the support being removably mounted relative to the housing containing the electric motor. Preferably, the lateral flanges have a plunging shape in the direction of the longitudinal axis, partially covering the roller, so as to conform to an area of skin having bristles.

In another aspect, there is provided a hair removal device comprising a hair removal head as described above, and a housing containing an electric motor, the housing being configured to be held in one hand during use.

Preferably, the housing and the epilation head form a sealed assembly, so that the epilator can be used in a humid environment.

Brief description of the drawings

Other characteristics, aims and advantages of the invention will emerge from the following description, which is purely illustrative and not limiting, and which should be read with reference to the appended drawings in which:

[Fig.l]

Figure 1 is a front view of a depilation head according to an embodiment of the present invention.

[Fig.2]

FIG. 2 is a perspective view of the rotary roller of a depilation head according to a first alternative embodiment of the invention, a single row of tear-offs being shown for clarity.

[Fig.3]

Figure 3 is a longitudinal sectional view taken with a plane passing through the middle of the tear off row of Figure 2.

[Fig.4]

Figure 4 is a side view of the rotating roller, some components being removed for clarity.

[Fig.5]

FIG. 5 is an exploded perspective view of the rotary roller of FIG. 2.

[Fig.6]

Figure 6 is a perspective view of the epilator head cage.

[Fig.7]

FIG. 7 is a perspective view of the central shaft of the epilation head, on which a tear-off pliers is mounted.

[Fig.8A]

FIG. 8A represents a front view of the epilation head according to a first embodiment, in which the support elements of two adjacent bars are longitudinally on the same side of the corresponding through orifices.

[Fig.8B]

FIG. 8B represents a front view of the epilation head according to a second embodiment, in which the support elements of two adjacent bars are longitudinally of opposite sides of the corresponding through holes.

Only the elements necessary for understanding the invention have been shown. To make the drawings easier to read, similar elements have identical references in all of the figures.

Description of the embodiments

Figures 1 to 5 illustrate a rotary roller 1 of a hair removal head for an electric hair removal device according to the present invention.

The rotary roller 1 is configured to be driven in rotation by an electric motor connected to a gear train (not illustrated), providing the rotary movement of the rotary roller of the epilation head around a longitudinal axis XX shown in FIG. 3, for example by means of a pinion 30 and a toothed wheel 33. The longitudinal axis XX defines a longitudinal direction of the roller.

The electric hair removal device generally comprises a hollow housing preferably made of plastic and so that it can be held in one hand and containing the electric motor and the gear train. Preferably, the housing is substantially elongated and extends in a direction orthogonal to the longitudinal direction of the roller.

Preferably, the housing and the epilation head form a sealed assembly, so that the electric epilator can be used in a humid environment, for example in a shower, without presenting a risk for a user of the device.

In the following description, the expression "approximately" will mean a variation tolerance of less than 10% relative to a central value indicated.

The epilation head includes a support 46 configured to hold the roller 1.

In the embodiment illustrated in Figure 1, the support 46 comprises side flanges (47,48) which are configured to hold the roller 1. The support 46 may be provided with fixing means on an upper part of the case of the hair removal device or be removably mounted on the case.

The side flanges (47,48) define in their upper part a depilation window centered with respect to the rotary roller 1, revealing the pliers of the rotary roller 1. The side flanges (47,48) have preferably a plunging shape in the direction of the longitudinal axis, partially covering the roller 1, so as to match a skin area having hairs. This plunging shape makes it possible in particular to attract the skin to which the epilating head is applied, by suction effect for example, so that the pliers are in contact with the skin and can pinch the shortest hairs.

In addition, the side flanges (47,48) form shoulder covers also allowing comfortable support on sensitive areas.

Figure 2 illustrates a perspective view of the rotary roller 1, on which a single bar 17 is mounted. The rotary roller 1 comprises several tearing rows (2.2 ’) arranged on the periphery of a cage 10. Preferably, the rotary roller 1 comprises six tearing rows uniformly distributed over its circumference. For reasons of clarity of the drawings, all of the tear-off rows assembled on the cage 10 have not been shown in FIGS. 2 to 5.

The tear rows 2 each comprise a single tear pliers 29 movably mounted on the cage 10. Each tear pliers 29 comprises a single tear blade 5. In operation, and as will be explained by the subsequently, a longitudinal movement back and forth of the tear-off blades 5 distributed over the circumference of the roller 1 defines an active circumferential zone, along which hairs can be torn off.

As illustrated in Figures 3 to 6, the cage 10 has a substantially hollow cylindrical shape. The cage 10 has an inner surface preferably forming a cylinder of revolution configured to receive a central shaft 12, and an outer surface typically having the shape of a regular straight prism. Preferably and in the embodiment shown, the outer surface has a prism shape with a hexagonal base, the six sides of which are extended by rectangular faces. As illustrated in FIG. 6, like the other rectangular faces, the rectangular face 25, corresponding to the tear-off row 2, has two lateral edges parallel to each other, orthogonal to one side 20 and forming heights of the prism . Each edge is delimited by a partition 21, extending over the external surface of the cage, and substantially orthogonal to the rectangular face 25. The partition 21 comprises a flange 22 returning towards the rectangular face 25, so as to define a housing for the tear blade 5 of the corresponding tear row 2. Thus, each edge forming a height of the prism is delimited by two partitions forming an angle of approximately 60 ° and substantially orthogonal to two adjacent rectangular faces, that is to say arranged successively on the circumference of the roller.

In general, by "outward" will be understood an orientation towards the outside of the cylinder, as opposed to "inward", designating an orientation towards the central longitudinal axis X-X of the cylinder. “Radial” part will be understood to mean a part extending radially over a part of the roller 1, that is to say orthogonally to the longitudinal axis, as opposed to a “longitudinal” part, extending in the longitudinal direction. . By two adjacent parts are meant parts arranged successively along the circumference of the roller, regardless of any contact between the parts.

According to the example presented, a through opening 24 of oblong shape is made in the rectangular face 25, so that a lower part of the pliers 29 (shown in Figure 4) of the row corresponding uprooting 2 can pass through the cage 10 in the direction of the central shaft 12. An arrangement of the elements during assembly will appear more clearly with regard to the exploded view of the roller 1 shown in FIG. 5.

Preferably, the cage 10 is made of a plastic material, for example of Γ Acrylonitrile butadiene styrene (ABS), typically by an injection technique.

The cage 10 is secured, on a first lateral face, typically on a hexagonal base, to the pinion 30 and is preferably made in one piece with the latter by the same injection operation for example. The pinion 30 includes teeth at its periphery, configured to transmit a rotational movement.

The edges of the cage 10 extend at a second lateral face, opposite the pinion 30, by rods 31 projecting towards the outside of the cylinder relative to the second lateral face. The rods 31 are substantially cylindrical, and each intended to be inserted into corresponding orifices 32 and included in the toothed wheel 33 in a step of assembling the rotary roller 1.

Figure 4 illustrates a side view of the cage 10, showing the pinion 30, the central shaft 12, and a cross section of the tear blade 5 of the tear pliers 29 assembled on the cage 10 As illustrated in FIG. 4, the cross section of the tear blade 5 is flat and has substantially a T shape. A free end of the tear blade 5 is configured to be brought into contact with a surface d 'support, located near a through hole 18 of a bar 17 (shown in Figure 5) corresponding to the tear row 2, during use to pinch a hair.

Figure 7 illustrates the tear-off pliers 29 mounted on a cam groove. The tear-off pliers 29 comprises a base formed by a spacer 27, on which the tear-off blade 5 is mounted. The tear blade 5 is preferably inclined in the direction of the bearing surface, for example by an angle of about 9 ° relative to a vertical plane orthogonal to the spacer 27. The fact that the blade tear-off 5 is inclined in the direction of the bearing surface makes it possible to guarantee that the end of the blade comes to bear correctly on the bearing surface, to maximize the nipping.

In the embodiment shown, the pliers 29 further comprises a second blade or guide blade 6, fixed at its lower part on the spacer 27. The guide blade 6 is however not configured to pluck hairs, and is therefore not an active part of the pliers 29. It should be noted that the plucking blade 5 and the guide blade 6 can be formed in one piece with the spacer 27. As illustrated in particular in FIG. 5, the bar 17 in this case comprises a blind hole 28 intended to receive the free end of the guide blade 6, so as to confine the guide blade 6 to the inside the epilation head. The guide blade 6 is useful for balancing the forces for the operation of the pliers 29.

Preferably, the tear blade 5, the guide blade 6 and the spacer 27 are produced by cutting and bending a steel sheet, for example a sheet with a thickness of about 0.3 mm.

The spacer 27 includes longitudinal edges 34 projecting outward, that is to say on the same side as the tear blade 5 relative to the spacer 27, so as to provide s' insert into the housing defined on the cage 10, being retained by the flanges 22.

As illustrated in Figure 7, the spacer 27 comprises in its lower part a lug 16. Preferably, the lug 16 is formed from a material different from that of the tear blade 5 and / or the guide blade 6, the material being chosen to optimize the sliding in the groove of the cam. We therefore choose for example a material having a low coefficient of friction.

Typically the lug 16 is fixed offset from the center of the base formed of the spacer 27, for example by riveting, in order to compensate for an imbalance due to the different shapes of the tear blade 5 and the blade guide 6. It projects inwards, on the side opposite to the tear blade 5 with respect to the spacer 27, so that, when the tear-off pliers 29 are movably mounted on the cage 10 by insertion by the side 20, the lug 16 is inserted into the opening 24 of the rectangular face 25, oriented in the direction of the central shaft 12.

Thus, the lug 16 is configured to travel, being guided by the cage 10, a branch of a cam 15 of the central shaft 12 when using the device. The cross section of the tear blade 5 is brought, during a rotation of the roller 1, into contact with the planar bearing surface disposed opposite, alternately, so as to alternately pinch a hair and release it.

The central shaft 12 has a substantially cylindrical shape of revolution around the longitudinal axis X-X. The central shaft 12 has a central part having an external diameter less than a diameter of the cylinder defining the internal surface of the cage 10, so that the central part of the central shaft 12 can be inserted into the cage 10. The central shaft 12 can be made of metal, for example aluminum, by a machining technique in particular, or in Zamak, by an injection technique in particular.

The cam 15 is carried by the central shaft 12, this cam 15 comprising at least one groove (14,14 ’, 14”) allowing guidance of the pliers 29.

According to a particular example as illustrated in Figure 5, the central part of the central shaft 12 comprises the cylindrical cam 15 having on its periphery a plurality of grooves parallel to each other, typically three grooves (14,14 ' , 14 ”).

The profile of a branch of the cam 15 determines the amplitude and the direction of the longitudinal translational movement of the tear-off pliers 29 when it is rotated around the longitudinal axis of the central shaft 12. The plurality of parallel grooves advantageously makes it possible to modify the amplitude of the movement of the tearing pliers 29. Indeed, the tearing pliers 29 can be offset with respect to each other.

According to an exemplary embodiment, the cam is formed in one piece where the groove typically has a continuous profile with closed contour comprising sloping areas, in order to guide the lug 16 so as to achieve the closure of the pliers

29.

According to another embodiment illustrated in particular in Figures 5 and 7, the cam 15 comprises a movable cam portion 35 having a plurality of grooves (19, 19 ', 19 ”) and mounted on the central shaft 12 of so as to be able to slide along the longitudinal axis XX under the thrust of a return spring 36, oriented parallel to the longitudinal axis, in the direction of closing of the pliers 29. With regard to the sectional view of the roller 1 shown in FIG. 3, the return spring 36 forms a means of compensating for manufacturing, mounting or wear clearances and thus guarantees permanent contact of the tear blade 5 with the bearing surface . The force for closing the pulling pliers 29 by the return spring 36 is determined so as to ensure optimum clamping allowing a good grip of a hair, without however cutting it during a pulling out. A clamping force of the tear-off pliers 29 is thus constant over time and well controlled, without adjustments being necessary for mounting or during use.

Each branch (19, 19 ', 19 ”) of the movable cam 35 is in the extension of a corresponding branch (14,14', 14”) of the fixed cam 15, so as to form a contour continuous groove on the periphery of the central shaft 12, contour which is traversed by the lug 16 during its drive in rotation about the longitudinal axis XX. Each branch (19, 19 ', 19 ”) comprises a bent zone with a fairly steep inclination, corresponding in use to an approach of the tear blade 5 on the corresponding bearing surface, and allowing rapid closure of the pliers 29 to grip a hair to be depilated.

The movable cam 35 is preferably made of a plastic material having a low coefficient of friction, for example a thermoplastic material based on polyoxymethylene (POM), by an injection technique in particular.

The central shaft 12 also has ends 11, having a smaller diameter than the central part, and configured to form rotational bearings for the pinion 30 and respectively the toothed wheel 33. The ends 11 are mounted fixed by relative to the housing of the epilating appliance, or preferably in the lateral flanges (47,48), themselves being fixed relative to the housing of the epilating appliance.

In the proposed depilation head, the rectangular face 25 on the side 20 corresponding to the tear-off row 2 is covered by a bar 17 disposed at the periphery of the roller 1. The same is true for the other rows of tearing evenly distributed around the circumference of the roller 1.

As illustrated in Figure 5, the bar 17 comprises a substantially rectangular base 38 of dimensions close to the rectangular face 25. The ends of the rectangular base 38 have on an internal face of the protrusions forming two lower edges 42 curved towards the interior, configured to be fixed on the edges of the partitions 21 of the rectangular face 25.

The bar 17 also includes a substantially rectangular central through hole 18 extending radially in the direction transverse to the longitudinal axis XX, so that the tear blade 5 passes through the through hole 18. The the through hole 18 thus forms a tear-off window extending radially outwards from the rotary roller 1 and along the circumference of the rotary roller 1. The through hole 18 is bordered by a support element 7 comprising a planar side bordering the through hole 18 and forming the bearing surface of the tear blade 5 during its reciprocating translation movement in the longitudinal direction.

Preferably, the support element 7 is made in one piece with the bar 17 by a technique of injecting a plastic material, for example ABS. The support element 7 has a thickness calculated to resist without deforming in contact with the tear blade 5. The support element 7 typically has a thickness greater than 1 mm, so as to have sufficient rigidity to not to deform when a force of about 3N is applied to it by the tear blade 5. In addition, the support element 7 has a radial thickness, that is to say a height of the protuberance that it forms with respect to the external surface of the bar 17, greater than 1 mm. Typically, the radial thickness is about 1.38 mm. The support element 7 must have a sufficient radial thickness to allow contact and correct nipping of a hair, so as to pull it out without breaking it.

In one embodiment, the through hole 18 is bordered by further an opposite element 8 to the support element 7, arranged so that the opposite element 8 and the support element 7 s 'extend radially with respect to the bar 17 on either side of the through orifice 18. Preferably, the support element 7 and the opposite element 8 have surfaces which are substantially plane and parallel to one another.

Figure 1 illustrates an assembled view of the roller 1 on which we identify precisely two bars (17,17 ’) consecutive each having a through hole (18,18’). The orifices (18,18 ’) of two adjacent bars (17,17’), that is to say arranged successively along the circumference of the roll 1 are offset longitudinally and have an overlap delimiting a circumferential epilation zone. The term “circumferential zone” will be understood to mean an area extending by a certain width in the longitudinal direction along the circumference of the roll. It will be understood by "longitudinally offset" that the circumferential zone delimited by the through orifice 18 of a first bar 17 is not identical to the circumferential zone delimited by the through orifice 18 'of a second bar 17' adjacent to the first bar, but that the two circumferential zones have a common zone corresponding to the overlap.

By width is meant a distance between two elements, measured in the longitudinal direction, typically orthogonal to a planar surface of a support element.

An opening width of a bar 17 is defined as the width between the support element 7 and the opposite element 8 to the support element. The opening width corresponds to a longitudinal distance between a flat face facing the through hole 18 of the element 8 opposite the support element and a flat face facing the through hole 18 of the support element 7. The opening width is less than 3 mm, preferably less than 2.5 mm. Typically, the opening width is approximately 2.1 mm.

We also define a functional opening width, corresponding to the opening width, from which we subtract a thickness of the tear blade. Preferably, the functional opening width is less than 2 mm. It should be noted that the tear blade can for example have a thickness of 0.3 mm.

In a first embodiment illustrated in Figure 8A, the support elements (7,7 ') of two adjacent bars (17,17') are longitudinally on the same side of the through holes (18,18 ') correspondents. The pliers (29.29 ’) of two adjacent bars (17.17’) move in the same direction along the longitudinal axis X-X when they move to pinch a hair against the bearing surface. The pinching direction according to this first embodiment is represented in FIG. 8A by the arrow L1. This first embodiment allows a simplified assembly of the epilation head.

The overlap width (Lcl) is defined in this embodiment as the shortest distance between a support element 7 'of a bar 17' and an opposite element 8 to a support element 7 ' an adjacent bar 17. The overlap width (Lcl) is defined as the distance measured orthogonally between the two internal surfaces of the elements 7 ′ and 8, facing each other and substantially plane and parallel to each other. The shorter distance also corresponds to the shorter of the two longitudinal distances that can be defined between a support element (7,7 ') of a first bar (17,17') and an opposite element (8 ', 8) to a support element (7', 7) of a second adjacent bar (17 ', 17).

In the embodiment of Figure 8A, the active area width (Lal) is the longitudinal distance between the two other elements of the two adjacent bars (17,17 '), that is to say the distance between the support element 7 of the first bar 17 and the element 8 'opposite the support element 7' of the adjacent second bar 17 '.

As illustrated in FIG. 8A, the overlap width (Lcl) is therefore measured between the support element 7 'and the opposite element 8, and the active area width (Lal) is measured between the support element 7 and the opposite element 8 '.

In a second preferred embodiment illustrated in FIG. 8B, the support elements (7,7 ’) of two adjacent bars (17,17’) are longitudinally opposite sides of the corresponding through holes. The pliers (29.29 ’) of two adjacent bars (17.17’) move in opposite directions along the longitudinal axis X-X as they move to pinch a hair against the corresponding bearing surface. The two gripping directions according to this second embodiment are represented in FIG. 8B by the arrows F2a and F2b. This second embodiment makes it possible to define a narrower hair pinching line than in the first previous embodiment, and therefore to allow more precise hair removal. This pinching line corresponds to the circumferential epilation zone. An overlap width (Lc2) is defined between the support elements (7.7 ’) of two adjacent bars (17.17’). The overlap width (Lc2) is defined as the distance measured orthogonally between the two internal surfaces of the elements (7.7 ’), facing each other and substantially planar and parallel to each other.

In the embodiment of Figure 8B, the width of the active area (La2) is the longitudinal distance between the two other elements of the two adjacent bars (17,17 '), that is to say between the two opposite elements (8,8 ') of the two adjacent bars (17,17').

It will be noted that whatever the embodiment in operation, the width definitions given previously in the first and the second embodiment correspond to identical distances, therefore Lcl = Lc2 and Lal = La2.

Preferably, a ratio between the overlap width and the opening width is less than 0.5, typically, the ratio is about 0.35.

The overlap width is for example less than 1 mm, preferably less than 0.8 mm, typically equal to 0.725 mm.

The active area has a width typically less than 4 mm.

This allows a user to have access to a not very wide epilating zone, and to pull hairs in the epilating zone with great precision.

Typically, it may be an area to be depilated on the face, for example the edge of the lips or the inter-eyebrow distance.

In the embodiment illustrated in Figures 8A and 8B, the elements 7 and 8 of the through hole 18 are symmetrically arranged on either side of the through hole 18, and have an internal face facing to the substantially flat through hole 18, and a corrugated outer face.

The opposite element 8 can also be produced in the same room as the bar 17 by injection of plastic material.

Description of an assembly

According to an exemplary embodiment, the assembly of the rotary roller 1 is done by in13 producing the central shaft 12 inside the cage 10.

As illustrated in Figure 3, the central shaft 12 is a sub-assembly which has been previously produced by mounting the movable cam 35 and the return spring 36, inserted in the movable cam 35, and one of which the first end bears on an internal wall of a cylindrical housing inside the movable cam 35, a second end, opposite the first end, bearing against a lateral internal surface of the central shaft 12.

The pliers 29 comprising the movable blade 5 is then introduced into the housing of the cage 10, by the exertion of a light pressure, in order to pass the pliers 29 below the flanges 22 , so that the lug 16 crosses the opening 24 to fit into a groove (14,14 ', 14 ”) of the cam 15 and / or a groove (19,19', 19”) of the cam mobile 35.

As illustrated in Figures 5 and 6, the openings 24 of two consecutive rectangular faces 25 are offset axially on the circumference of the cage 10, which allows rapid orientation for mounting the movable blades offset axially on the circumference of the rotary roller 1. When all the movable blades have been mounted on the six sides of the cage 10, the bars are forcibly inserted on the periphery of the cage, the lower edges 42 of a bar 17 being fixed on the edges 22 of the partitions 21 of the rectangular face 25 of the cage 10. The assembly of the rotary roller 1 is finished by mounting the toothed wheel 33 at the end of the rods 31 of the cage 10.

Description of a use

In operation, the pinion 30 and the toothed wheel 33 receive a rotational movement of the electric motor of the housing, which causes a rotation of the cage 10 around the longitudinal axis X-X of the central shaft 12 mounted fixed. The cage 10 drives the movable blades 5 which follow the grooves of the cams (15, 35) and move in an alternative translational movement, their nip edges inclined in the direction of the radial walls 7 come to bear against them. The pliers formed by a movable tear blade 5 and a support element 7 opposite are thus closed by enclosing the bristles which are then plucked by the rotation of the roller 1.

References

ER2923685, ER 2 858 528, ER 2 923 685

Claims (1)

Claims [Claim 1] Hair removal head for a hair removal device with an electric motor, comprising a roller (1) having: a central shaft (12) carried by a longitudinal axis and comprising at least one cam (15) having at least one branch (14), - a cage (10) substantially cylindrical of revolution around the longitudinal axis, intended to be driven in rotation around the longitudinal axis by the electric motor, - A plurality of tear-off rows (2) disposed on the periphery of the cage (10), each tear-off row (2) comprising a single tear-off pliers (29) movably mounted on the cage (10) and guided by the at least one branch (14) of the cam (15), each tear-off pliers (29) comprising a single tear-off blade (5), - A plurality of longitudinal bars (17) respectively arranged facing the plurality of tear rows (2) radially outward, each longitudinal bar (17) comprising a through hole (18) having a support element ( 7) extending radially with respect to said bar (17), the tear blade (5) of the tear pliers (29) of the corresponding tear row (2) being arranged to pass through said through orifice ( 18) and to come to bear on the support element (7) so as to alternately pinch hairs on the support element (7) and release them during the movement of rotation of the cage (10) relative to the central shaft (12) in which the through holes (18,18 ’) of two adjacent bars (17,17’) are longitudinally offset and have an overlap delimiting a circumferential epilation zone. [Claim 2] Hair removal head according to claim 1, in which each tear-off pliers (29) comprises a base (27) on which the tear-off blade (5) is mounted, said base (27) comprising a lug (16) running through the cam groove (14) (15) of the central shaft (12), and the pliers (29) further comprising a guide blade (6) mounted on the base (27). [Claim 3] The epilation head according to claim 2, in which each bar (17) further comprises a blind hole (28) intended to receive a free end of the guide blade (6), so as to confine said guide blade (6 ) inside the epilation head. [Claim 4] Hair removal head according to any one of claims 1 to 3, in which the tear blade (5) of each tear-off pliers (29) is arranged inclined in the direction of the support element (7) of the through hole (18) of the corresponding bar (17). [Claim 5] Hair removal head according to any one of the preceding claims, in which the support element (7) extends radially with respect to the bar (17) of a thickness greater than 1mm. [Claim 6] Hair removal head according to any one of the preceding claims, in which the through hole (18) also has an opposite element (8) to the support element (7), the opposite element (8) and said support element (7) extending radially with respect to the bar (17) on either side of the through orifice (18), in which an opening width is defined between the opposite element ( 8) to the support element (7) and said support element (7), and the opening width being less than 3 mm, preferably less than 2.5 mm. [Claim 7] Epilation head according to claim 6, in which the support elements (7,7 ’) of two adjacent bars (17,17’) are longitudinally on the same side of the corresponding through holes (18,18 ’). [Claim 8] Epilation head according to claim 7, in which an overlap width is defined as the shortest distance in the longitudinal direction between a support element (7) of a bar (17) and an opposite element (8 ') to a support element (7 ') of an adjacent bar (17'), and in which a ratio between the overlap width and the opening width is less than 0.5, preferably approximately equal to 0.35. [Claim 9] Epilation head according to claim 6, in which the support elements (7,7 ’) of two adjacent bars (17,17’) are longitudinally on opposite sides of the corresponding through holes (18,18 ’). [Claim 10] A hair removal head according to claim 9, in which an overlap width is defined between the support elements (7,7 ') of two adjacent bars (17,17'), and in which a ratio between the overlap width and the opening width is less than 0.5, preferably approximately equal to 0.35. [Claim 11] A depilation head according to any one of the preceding claims, in which the circumferential depilation zone has a width of between 0.5 mm and 1.5 mm, preferably between 0.7 mm and 1 mm. [Claim 12] An epilating head according to any one of the preceding claims, further comprising a support (46) configured to hold the roller (1) and comprising two lateral flanges (47,48), the support (46) being removably mounted relative to the housing containing the electric motor. [Claim 13] Epilation head according to claim 12, in which the lateral flanges (47,48) have a plunging shape in the direction of the longitudinal axis, partially covering the roller (1), so as to conform to an area of skin having bristles . [Claim 14] A hair removal apparatus comprising a hair removal head according to any one of the preceding claims, and a housing containing an electric motor, the housing being configured to be held in one hand during use. [Claim 15] The epilator according to claim 14, wherein the housing and the epilation head form a sealed assembly, so that the epilator can be used in a humid environment. 1/5