Motor vehicle seat headrest

Abstract

The invention relates to a headrest (1) for a motor vehicle seat, said headrest comprising a secondary body (4) mounted to slide longitudinally on a main body (3) so that said secondary body can adopt a plurality of longitudinal adjustment positions, said headrest further comprising an elastically compressible damping means (10), said means being mounted so as to be compressed between said main and secondary bodies when said secondary body is adjusted to the extreme front position. Figure 1

Description

Title of the invention: Headrest for a motor vehicle seat

[0001] The invention relates to a headrest for a motor vehicle seat.

[0002] It is known to produce a headrest for a motor vehicle seat, said headrest comprising: • a mounting frame on a back of said seat, • a main body mounted on said frame, • a secondary body mounted to slide longitudinally on said main body, so that said secondary body can adopt a plurality of longitudinal adjustment positions, said secondary body being provided with a wall for receiving the head of an occupant of said seat, • a device for locking said secondary body in the chosen adjustment position, said device comprising a latch mounted to slide on said main body between a locking position, where it cooperates with a locking rack extending longitudinally on said secondary body, and an unlocking position, where it moves away from said rack to release the sliding of said secondary body, said device further comprising a spring means for actuating said latch in locking and a means for actuating said latch in unlocking against said spring means, said rack having a plurality of transverse grooves succeeding one another longitudinally and having a substantially vertical front face, so that the sliding of said secondary body is blocked towards the rear in all adjustment positions.

[0003] With such an arrangement, the user must actuate the locking device in unlocking mode in order to be able to push the secondary body backwards, the blocking of said body in rearward sliding in the absence of voluntary unlocking being dictated by safety considerations, the headrest having to remain blocked in its longitudinal adjustment position in the event of the occupant's head hitting its receiving wall.

[0004] However, with such an arrangement, when the secondary body is brought into the extreme forward position, the user may feel a sensation of overall play inherent in the elementary plays which must be defined to ensure correct operation of the locking of said body in said position.

[0005] This results in a lack of rigidity which can lead to poor quality perceived by the user.

[0006] The invention aims to overcome this drawback.

[0007] To this end, the invention proposes a headrest for a motor vehicle seat, said headrest comprising: • a mounting frame on a back of said seat, • a main body mounted on said frame, • a secondary body mounted to slide longitudinally on said main body, so that said secondary body can adopt a plurality of longitudinal adjustment positions, said secondary body being provided with a wall for receiving the head of an occupant of said seat, • a device for locking said secondary body in the chosen adjustment position, said device comprising a latch mounted to slide on said main body between a locking position, where it cooperates with a locking rack extending longitudinally on said secondary body, and an unlocking position, where it moves away from said rack to release the sliding of said secondary body, said device further comprising a spring means for actuating said latch in locking and a means for actuating said latch in unlocking against said spring means, said rack having a plurality of transverse grooves succeeding one another longitudinally and having a substantially vertical front face, so that the sliding of said secondary body is blocked towards the rear in all adjustment positions,

[0008] said headrest further comprising an elastically compressible damping means, said means being mounted so as to be compressed between said main and secondary bodies when said secondary body is adjusted to the extreme forward position.

[0009] In this description, the terms of positioning in space (longitudinal, transverse, vertical, lateral, front, rear, etc.) are taken with reference to the headrest arranged in the vehicle in use, said vehicle extending longitudinally along its length (X axis), transversely along its width (Y axis) and vertically along its height (Z axis).

[0010] With the proposed arrangement, when the secondary body is brought into the extreme front position, the damping means makes it possible to minimize the sensation of overall play perceived by the user.

[0011] This results in improved rigidity which leads to an improvement in the quality perceived by the user.

[0012] Other features and advantages of the invention will appear in the following description, given with reference to the attached figures, in which:

[0013] [Fig-1] is a partial schematic perspective view of a headrest according to a realization,

[0014] [Fig.2a] and

[0015] [Fig.2b] are partial schematic sectional views of the headrest of [Fig.l], the secondary body being in the extreme rear ([Fig.2a]) and extreme front ([Fig.2b]) adjustment position.

[0016] With reference to the figures, a headrest 1 for a motor vehicle seat is described, said headrest comprising: • a frame 2 for mounting on a back of said seat, • a main body 3 - in particular made of molded plastic material - mounted on said frame, • a secondary body 4 - in particular made of molded plastic material - mounted to slide longitudinally on said main body, so that said secondary body can adopt a plurality of longitudinal adjustment positions, said secondary body being provided with a wall 5 for receiving the head of an occupant of said seat, • a device for locking said secondary body in the chosen adjustment position, said device comprising a latch 6a, 6b mounted to slide - vertical according to the embodiment shown - on said main body between a locking position, where it cooperates with a locking rack 7a, 7b extending longitudinally on said secondary body, and an unlocking position, where it moves away from said rack to release the sliding of said secondary body, said device further comprising a spring means, not shown, for actuating said latch in locking and a means, not shown, for actuating said latch in unlocking against said spring means, said rack having a plurality of transverse grooves 8 succeeding one another longitudinally and having a substantially vertical front face 9,so that the sliding of said secondary body is blocked backwards in all adjustment positions, ,

[0017] said headrest further comprising an elastically compressible damping means 10, said means being mounted so as to be compressed between said main and secondary bodies when said secondary body is adjusted to the extreme forward position.

[0018] According to the embodiment shown, a groove 8 has a rear face 11 inclined relative to the vertical, so as to be tapered to allow sliding of the secondary body 4 forwards without having to unlock the locking device.

[0019] With such an arrangement, the seat occupant simply pulls the secondary body 4 forward to advance its adjustment position.

[0020] According to the embodiment shown, the frame 2 comprises two parallel metal rods 12.

[0021] According to the embodiment shown, the damping means 10 comprises at least one pad 13 made of elastically compressible foam - in particular polyurethane.

[0022] According to the embodiment shown, a pad 13 has a cylindrical shape and is provided with an axial conduit 14 for receiving a stud 17 in a nested manner, said stud coming from the secondary body 4 according to the embodiment shown.

[0023] In a variant not shown, the damping means 10 comprises at least one metal spring.

[0024] According to the embodiment shown, the damping means 10 comprises two pads 13 - or springs in a variant not shown - arranged in lateral parts of the headrest 1, so as to limit the play of the secondary body 4 when it is brought into the extreme front position by asymmetrical traction on each of its lateral sides.

[0025] According to the embodiment shown, the pads 13 - or springs in a variant not shown - are further arranged in the lower part of the headrest 1, so as to limit the longitudinal play of the secondary body 4 when it is brought into the extreme front position by traction applied essentially at the top of said body.

[0026] According to the embodiment shown, the headrest 1 comprises two latches 6a, 6b each cooperating with a respective rack 7a, 7b.

[0027] According to the embodiment shown, the two latches 6a, 6b are in the general form of plates sliding against each other in two opposite vertical directions.

[0028] According to the embodiment shown, a rack 7a, 7b is arranged on a guide member 15a, 15b for sliding the secondary body 4 on the main body 3.

[0029] According to the embodiment shown, the guide member 15a, 15b is in the form of a tenon secured to the secondary body 4, said tenon sliding in a mortise 16a, 16b provided in the main body 3.

[0030] According to the embodiment shown, the headrest 1 comprises an upper tenon 15a and a lower tenon 15b each sliding in a respective upper mortise 16a and lower mortise 16b.

[0031] In a manner not shown, the main body 3 can be slidably mounted on the frame 2 so as to be able to adopt a plurality of vertical adjustment positions, the headrest 1 comprising a device for locking said main body in the chosen adjustment position.

[0032] According to an embodiment not shown, the locking device of the main body 3 comprises: • a plurality of locking notches arranged axially on at least one of the rods 12 (the term “axially” being considered with reference to the extension axis of said rod) so as to define a notched rod, • at least one locking projection mounted to move relative to said main body between a locking position, where said projection is inserted into one of said notches, and an unlocking position, where said projection is withdrawn from said notch in order to release the sliding of said body.

[0033] In a manner not shown, the locking devices of the main body 3 and secondary body 4 can be actuated in unlocking by a common actuating means, said means comprising for example an actuating button - for example in the form of a push button - of a crosspiece mounted on said main body in transverse sliding and cooperating with said devices.

Claims

Claims

1. Headrest (1) for a motor vehicle seat, said headrest comprising: • a frame (2) for mounting on a back of said seat, • a main body (3) mounted on said frame, • a secondary body (4) mounted to slide longitudinally on said main body, so that said secondary body can adopt a plurality of longitudinal adjustment positions, said secondary body being provided with a wall (5) for receiving the head of an occupant of said seat, • a device for locking said secondary body in the chosen adjustment position, said device comprising a latch (6a, 6b) mounted to slide on said main body between a locking position, where it cooperates with a locking rack (7a, 7b) extending longitudinally on said secondary body, and an unlocking position, where it moves away from said rack to release the sliding of said secondary body,said device further comprising a spring means for actuating said latch in locking and a means for actuating said latch in unlocking against said spring means, said rack having a plurality of transverse grooves (8) succeeding one another longitudinally and having a substantially vertical front face (9), so that the sliding of said secondary body is blocked towards the rear in all adjustment positions, said headrest being characterized in that it further comprises an elastically compressible damping means (10), said means being mounted so as to be compressed between said main and secondary bodies when said secondary body is adjusted to the extreme front position.,

2. Headrest (1) according to claim 1, characterized in that the damping means (10) comprises at least one pad (13) made of elastically compressible foam.

3. Headrest (1) according to claim 1, characterized in that the damping means (10) comprises at least one metal spring.

4. Headrest (1) according to one of claims 2 or 3, characterized in that the damping means (10) comprises two pads (13) or springs arranged in lateral parts of said headrest.

5. Headrest (1) according to claim 4, characterized in that the pads (13) or springs are further arranged in the lower part of said headrest.

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