FR3036666A1 - VEHICLE SEAT HEADREST AND SEAT COMPRISING SUCH A HEADREST - Google Patents

Abstract

Headrest a spindle extending in a first direction of adjustment (Z), a support (9) mounted movable in translation on the spindle, a first locking device (19) mounted on the support for selectively locking and unlocking the support on the spindle, a headrest structure (11) mounted movable in translation on the support in a second adjustment direction (X), a second locking device (32) mounted on the support and movable independently of the first locking for selectively locking and unlocking the headrest structure on the support, and a user operable control member (8) for simultaneously unlocking the first and second locking devices.

Description

BACKGROUND OF THE INVENTION The present invention relates to headrests for vehicle seats and vehicle seats comprising such headrests. BACKGROUND OF THE INVENTION More particularly, the invention relates to a headrest for a vehicle seat, adjustable both in height and horizontally. The object of the invention is in particular to ensure that this double adjustment is done simply and ensures a particularly reliable locking of the headrest in both directions, to contribute to ensuring the safety of the occupant of the seat. SUMMARY OF THE INVENTION To this end, the invention proposes a headrest for a vehicle seat, comprising: at least one pin intended to be fixed to a seat back and extending in a first direction of adjustment, a support mounted mobile in translation on said at least one pin in the first direction of adjustment; a first locking device mounted on the support and movable between: a height locking position where said first locking device interferes; with said at least one pin for securing the support in the first adjustment direction, the first locking device being elastically biased towards the height-locking position, a height-adjusting position where said first locking device does not interfere with said at least one pin, so as to allow a displacement of the support in the first direction of adjustment, A headrest structure movably mounted in translation on said support in a second direction of adjustment substantially perpendicular to the first direction of adjustment; a second locking device mounted on the support and movable independently of the first locking device; between: - a horizontal locking position where said second locking device interferes with said headrest structure 15 to immobilize said headrest structure in the second adjustment direction, the second locking device being elastically biased towards the horizontal locking position independently of the first locking device; - a horizontal setting position where said second locking device does not interfere with said headrest structure so as to allow displacement of said support structure in the second direction of adjustment, an org a user actuatable control pin for simultaneously unlocking the first and second locking devices, said control member being movable between: - an actuating position where said control member moves the first locking device into the adjustment position by height and the second locking device in the horizontal adjustment position; - a rest position where said control member does not interfere with the first locking device and the second locking device. Thanks to these provisions, the user can unlock the headrest by actuating a single control member, then adjust the headrest in a simple manner by moving in the first and second directions of adjustment. When the headrest is in the desired position, the user releases its action on the control device and the headrest is relocked automatically under the effect of elastic stresses applied to the first and second adjustment devices.

The headrest is very easy to use. In addition, because the first and second adjusting devices are movable independently of one another and biased independently of each other to their respective locking positions, the reliability of the locking is optimized; in particular, if the relocking is done in one of the adjustment directions, this fault does not prevent re-locking in the other direction of adjustment. In various embodiments of the headrest 25 according to the invention, it may optionally be resorted further to one and / or the other of the following provisions: - the headrest further comprises first and second transmission members on which the control member is adapted to act when actuated, the first locking device having a first locking member adapted to engage the pin when the first locking device is in position. locking position in height, the first locking member being mechanically connected to the first transmission member such that said first locking member is disengaged from the pin when the control member is in the actuating position; second locking device comprising a second locking member adapted to engage with the headrest structure when the second locking device The lock is in the horizontal locking position, the second locking member being mechanically connected to the second transmission member such that said second locking member is disengaged from the headrest structure when the control member is in position. actuation; the actuating member and the first and second transmission members are slidably mounted independently of each other parallel to a third direction substantially perpendicular to the first and second adjustment directions, the actuating member being adapted to push the first and second transmission members when said control member is actuated; The headrest structure at least partially encloses the support and the control member is mounted on said headrest structure, the control member and the first and second transmission members being sufficiently wide according to the second direction of adjustment so that the control member is at least partially facing each of the first and second transmission members regardless of the adjustment of the headrest structure in the second direction of adjustment; the pin comprises notches and the first locking member is a first branch belonging to a spring wire connected to the first transmission member, the first branch extending perpendicularly to the first direction of adjustment between first and second ends; Said spring wire further comprises second and third branches respectively extending the first and second ends of the first limb, the second limb resiliently urging the first limb towards the vertical locking position and the third limb being connected to the first limb; transmission member so as to be disengaged from the notches of the spindle when the control member is in the actuating position; - The headrest comprises two parallel pins 10 with notches and an unlocking member pivotally mounted about a pivot axis perpendicular to the third direction, the first transmission member being arranged to rotate the unlocking member in an unlocking position 15 when said transmission member is moved by actuation of the control member, and the first locking device comprises two spring wires each having: - a first branch adapted to engage 20 in the notches of one of the spindles, a second branch resiliently urging the first branch towards the corresponding spindle, and a third branch connecting the first branch to the unlocking member, the third respective branches of the two spring strands being connected to the spool member. unlocking at substantially diametrically opposite points on either side of the pivot axis so that said unlocking member disengages the first branches of the notches of the two pins when said unlocking member is pivoted into the unlocking position; the second transmission member comprises a rack extending in the third direction, the second locking member is pivotally mounted on the support according to an axis of rotation parallel to the second direction of adjustment and comprises an arcuate toothing; a circle meshing with said rack, said second locking member having, on only a part of its periphery, a plurality of fins aligned in the second direction of adjustment and selectively adapted, to penetrate into corresponding slots in the structure of the the headrest when the second locking device is in the horizontal locking position, or disengage from said slots when the second locking device is in the horizontal adjustment position; - The headrest structure comprises at least one guide arm extending in the second direction of adjustment, sliding in a guide integral with the support, said slots being formed in said guide arm; the headrest has a main bearing face intended to serve as a support for the head of a user sitting on the seat, and the second adjustment direction is substantially perpendicular to said main bearing face. Furthermore, the invention further relates to a vehicle seat comprising a seat, a backrest and a headrest as defined above whose spindle is mounted on the backrest. Of course, the various features, variations and / or embodiments of the present invention may be associated with each other in various combinations to the extent that they are not incompatible or exclusive of each other. BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be better understood and other features and advantages will become apparent upon reading the following detailed description of an embodiment, given by way of illustration in reference to the accompanying drawings, in which: FIG. 1 is a schematic side view of a vehicle seat equipped with a headrest according to one embodiment of the invention, FIG. 2 a perspective view from above of the FIG. 1 is a headrest of the seat of FIG. 1 without its padding, showing in the locked position; FIG. 3 is similar to FIG. 2 without the front part of the headrest structure, showing the support mounted vertically sliding on the pins and on which is mounted sliding horizontally the headrest structure, - Figure 4 is an exploded view showing the visible parts in Figure 3, - Figure 5 is a view is in vertical section of the support, the pins and the control member, the section being taken along line VV of FIG. 3, FIG. 6 is a view of the support visible in FIGS. 3 to 5, in perspective from below, FIGS. 7 and 8 are perspective views, seen respectively from three-quarters of above and below, of the control devices belonging to the support and allowing adjustment of the headrest by actuation of the control member; Figure 9 is a partial perspective view showing a portion of the head restraint structure and the control devices without the holder or the pins, in the unlocked position. DETAILED DESCRIPTION It should be noted that, in the figures, the structural and / or functional elements have the same references. For the sake of clarity, only the elements useful for understanding the described embodiments have been shown and will be detailed.

In the description which follows, when reference is made to absolute position qualifiers, such as the terms 'before', 'back', 'up', 'down', 'left', 'right', etc. ., or relative, such as the terms 'top', 5 'below', 'upper', 'lower', etc., or with qualifiers for orientation, reference is made to a seat in a normal position of use of it in the direction of ordinary progression of the vehicle. FIG. 1 represents a seat 1 of automobile vehicle 10 having backrest 2 mounted on a seat 3, which is mounted on the floor 4 of the vehicle, for example using slides 5. The backrest 2 carries a headrest 6 per through a support frame consisting of one or more generally two pins 7.

The pins 7 extend substantially vertically in the normal position of use of the seat. They are secured to the backrest frame and the headrest is adjustable in height along the pins 7, in a first direction of adjustment Z substantially vertical.

According to the invention, the headrest is also adjustable forwards and backwards in a second substantially horizontal direction of adjustment X. Both settings are made by operating a single control member 8, for example a push button 25 disposed on one side of the headrest. The actuation of the control member 8 releases the headrest according to the two adjustment directions Z, X, and the release of the actuating member causes the locking of the headrest in position, according to the two adjustment directions X, Z.

As shown in FIGS. 2 to 4, the pins 7 may belong to a single support member in the form of a bow, comprising an upper transverse branch 7a connecting the two pins 7. This support member may be made for example in a tube metallic, as is well known.

The headrest 6 may comprise a support 9 slidably mounted on the pins 7 in the first adjustment direction Z. This support 9 may optionally be molded of plastics material. The support 9 may comprise, for example, two recesses 10 extending in the first direction of adjustment Z and in which the two spindles 7 respectively slide. The headrest may furthermore comprise a headrest structure 11 mounted sliding on the support 9 10 in the second direction of adjustment X. This headrest structure 11 generally carries a padding (not shown in Figures 2 to 4) against which the user of the seat supports his head. The headrest structure 11 may advantageously form a casing at least partially enclosing the pins 7 and the support 9. This headrest structure 11 may comprise, for example, a front shell 12 and a rear shell 13, secured together. by clipping and / or screwing and / or riveting or other. These shells 12, 13 may for example be molded of plastic. The headrest structure 11 may comprise a guide 14 in which is slidably mounted the push button 8, for example in a third direction Y perpendicular to the X, Z directions mentioned above. This guide 14 may for example be mounted on the rear shell 13, in particular by clipping or otherwise. The push button 8 is biased towards its rest position (corresponding to the locking of the headrest 6), possibly by a spring 8a bearing on the guide 14 (see Figure 5). The headrest structure 11 may be slidably mounted on the support 9 in the second adjustment direction X by any known means. For example, as shown in FIGS. 3 and 4, the head support structure 11 may comprise one or more guide arms 15, parallel to the first guide direction X, on which respectively slide one or more In the example shown, the guide arms may comprise a central guide arm 15 and two lateral guide arms 16. In the example shown, the guide arms 15, 16 are molded from the guide rails 17 and 18. one piece with the rear shell 13, and they may possibly cooperate by interlocking with the front shell 12. For example, the front shell 12 may comprise nipples 12a projecting rearwardly (Figure 2), nested and / or riveted in recesses 15a, 16a formed at the free end of the guide arms 15, 16 (Figure 3). The deflection of the headrest structure 11 relative to the support 9 in the second adjustment direction 15 X may be typically a few centimeters, for example of the order of 4 cm. The headrest 6 further comprises a first locking device 19, seen in more detail in FIGS. 4 to 8, controlled by the pushbutton 8 to selectively block or unlock the sliding of the support 9 on the pins 7 in the first adjustment direction Z. The first locking device 19 may comprise for example two metal spring wires 20, 25 carried by the support 9 and each having a first horizontal branch 21 adapted to engage in horizontal notches 7b formed along the corresponding pin 7, in a manner known per se. The first locking device 19 is movable 30 between: a locking position in height (ie locking the headrest 69 in height), where the first branch 21 of each spring wire 20 is engaged in one of the notches 7b of the corresponding spindle 7, in order to immobilize the support 9 in the first direction of adjustment Z, - a height adjustment position where the first branch 21 of each spring wire 20 is spaced from the corresponding spindle to be disengaged notches 7b of the spindle, so as to allow a displacement of the support 9 according to the first direction of adjustment Z. The first locking device 19 is biased elastically towards the locking position in height, by the elasticity of the spring wires 20 .

As shown in more detail in FIGS. 7 and 8, each spring wire 20 may further comprise second and third branches 22, 23 respectively extending the two ends of the first branch 21.

The second branch 22 resiliently biases the first leg 21 towards the locking position in height, in the direction of the arrow 22a. This second branch 22 may for example be connected to a fourth branch 24 by means of a turn 25, the fourth branch bearing on a portion of the support 9 and the turn 25 resiliently biasing the second and fourth branches 22, 24 at the mutual distance. The third branch 23 of the spring wire 20 is for example hooked, at its free end 23a, to an unlocking member 26 which is controlled by the push button 8, by means of a first transmission member 27. unlocking member 26 may be a rigid plate, for example of plastics material, which is pivotally mounted on the support 9 around a pivot axis Z0 perpendicular to the third direction Y, for example parallel to the first direction of adjustment. The unlocking member 26 is connected to the respective free ends 23a of the third branches 23 of the two spring wires, at coupling points 26a diametrically opposite one another on either side of the pivot axis ZO. In this way, when the unlocking member 26 pivots in the direction of the arrow 26b, it pulls on the third branches 23 of the two spring wires in the direction of the arrow 23a, so that the first branches 21 emerge from the notches 7b of the two pins (height adjustment position, visible in Figure 9). The free ends of the third branches 23 may for example be bent and engaged in slots of the unlocking member 26, which slots form the attachment points 26a mentioned above (Figures 7 and 8). The first transmission member 27 is slidably mounted on the support 9, in the third direction Y.

This first transmission member 27 is arranged at least partially facing the push button 8, so that when the user presses the push button 8 in the direction of the arrow Y1, this translational movement is transmitted to the first member of the transmission 27.

The control member 8 and the first transmission member 27 are sufficiently wide in the second direction of adjustment X, so that the control member 8 is at least partially opposite the first transmission member 27 regardless of the setting of the headrest structure 11 in the second direction of adjustment X. For this purpose, the first transmission member 27 may be in the form of an elongated strip in the third direction Y and whose width is parallel to the second adjustment direction X. Optionally, the first transmission member 27 may comprise an enlarged head 27a according to the second adjustment direction X, opposite the push button 8. In the example shown, the first transmission member 27 comprises in addition, an elongate hole 27b, 35 elongated in the third direction Y, which oblong hole 27b is traversed by one of the pins 7. The first transmission member 27 may comprise a part such as a finger 28, fit to press a shoulder 29 of the unlocking member 26 so as to rotate the unlocking member 26 in the direction 26b and thus unlock the first locking device 19 when the user presses the push button 8 in the Y1 direction to place it in the actuated position (FIG. 9).

The headrest 6 further comprises a second locking device 32, visible in FIGS. 4 to 8. The second locking device 32 is mounted on the support 9 and movable independently of the first locking device 19 between: a horizontal locking position where the second locking device 32 interferes with the headrest structure 11 to immobilize said headrest structure 11 in the second adjustment direction X, - a horizontal adjustment position where said second locking device 32 does not interfere with said headrest structure 11, so as to allow displacement of said headrest structure 11 in the second direction of adjustment X. In the example shown, the second device 25 of locking 32 may comprise a second locking member 33 pivotally mounted on the support 9, along an axis of rotation X0 parallel to the second direction of adjustment X. This second locking member 33 may for example be in the form of a rod extending along the axis of rotation X0 and having radial fins 34, for example in the shape of an arc of a circle centered on the rotation axis X0. The fins 34 are present on only a part of the periphery of the second locking member 33 and are aligned with each other 35 in the second direction of adjustment X.

These fins 34 are selectively adapted, either to penetrate into corresponding radial slots 37 formed in the headrest structure 11 when the second locking device is in a horizontal locking position (FIGS. 4 to 8), or to disengage from said slots 37 when the second locking device is in the horizontal adjustment position (Figure 9). The slots 37 may for example be provided in an upper face 15b of the aforementioned central guide arm 15. In the example shown, this upper face 15b further comprises a groove 36 in which slides the second locking member when in the horizontal adjustment position (Figure 4).

As shown in FIG. 6, the support 9 may also comprise radial slots 34a in which the fins 34 engage. As can be seen in FIGS. 7 and 8, at least one of the fins 34 and for example two of the fins 34, includes (s) a toothing 35 in a circular arc centered on the axis of rotation X0. Each toothing 35 meshes with a rack 31 belonging to a second transmission member 30 which is slidably mounted on the support 9 in the third direction Y, independently of the first transmission member 27. The second transmission member 30, like the first member transmission 27, is arranged at least partially opposite the push button 8, so that when the user presses the push button 8 in the direction of the arrow Y1, this translational movement is transmitted to the second transmission member 30 As previously explained, the control member 8 and the second transmission member 30 are sufficiently wide in the second direction of adjustment X so that the control member 8 is at least partially opposite the second control member. transmission 30 regardless of the adjustment of the headrest structure 11 according to the second direction of adjustment X. For this purpose, the second 5 organ e transmission 30 may be in the form of an elongated strip in the third direction Y and whose width is parallel to the second direction of adjustment X. Optionally, the second transmission member 30 may comprise an enlarged head 30a according to 10a. second adjustment direction X in correspondence with the enlarged head 27a above, opposite the push button 8. In the example shown, the second transmission member 30 is disposed under the first transmission member 27 and further comprises an oblong hole 30b, elongate in the third direction Y and arranged in correspondence with the oblong hole 27b of the first transmission member, which oblong hole 30b is traversed by one of the pins 7.

The second transmission member 30 is elastically biased towards the push button 8, that is to say towards the horizontal locking position, for example by a spring 38 bearing on the support 9. The sliding assembly independent of the first and 25 second transmission members 27, 30 on the support 9 can for example be made as follows: - the second transmission member 30 can be mounted directly on the support 9, for example by being guided in particular in an upper opening 9a forming a slide 30 , formed in the upper part of the support 9 (Figure 4), and said second transmission member 30 may also comprise side tongues 30d, engaged in lateral slots 9b of the support 9 (Figures 4 and 6 to 8), 35 - the first transmission member 27 may be mounted freely sliding on the second transmission member 30, for example by being guided in particular by retaining tabs 30 c of the second transmission member 30 and vertical side tabs 27c 5 of the first transmission member, which slide in said upper opening 9a (Figures 4 and 6 to 8). The adjustment of the headrest 6 operates as follows. When a user presses the pushbutton 8 in the direction of the arrow Y1 (FIG. 9), the pushbutton 8 simultaneously presses the enlarged heads 27a, 30a of the first and second transmission members 27, 30 and moves them in the direction of the arrow Y1. This movement pivots the unlocking member 26 which places the first locking device 26 in a vertical adjustment position. This movement simultaneously rotates the second locking member 33, so that the second locking device comes to the horizontal adjustment position. The headrest 6 can then be adjusted manually vertically and / or fore and aft, by direct action of the user on the headrest, as long as the pushbutton 8 is held down. When the user releases the push button 8, the first and second locking devices 19, 32 return to the initial locking position under the effect of the elasticity of the spring wires 20 and the spring 38, respectively. mechanisms is prevented from returning completely to the locking position, this does not prevent the other immediately return to the locking position. 30

Claims (10)

REVENDICATIONS1. A headrest (6) for a vehicle seat, comprising: being - at least one pin (7) for attaching to a seat back (2) and extending in a first direction of adjustment (Z), - a carrier ( 9) mounted mobile in translation on said at least one pin (7) in the first direction of adjustment (Z), - a first locking device (19) mounted on the support (9) and movable between: - a locking position in height where said first locking device (19) interferes with said at least one pin (7) to immobilize the support (9) in the first adjustment direction (Z), the first locking device (19) being resiliently biased towards the locking position in height, - a height adjustment position where said first locking device (19) does not interfere with said at least one pin (7), so as to allow a displacement of the support (9) according to the first direction of adjustment (Z), - one s headrest structure (11) movably mounted in translation on said support (9) in a second direction of adjustment (X) substantially perpendicular to the first direction of adjustment (Z), - a second locking device (32) mounted on the support (9) and movable independently of the first locking device (19) between: - a horizontal locking position where said second locking device (32) interferes with said headrest structure 3036666 18 (11) to immobilize said headrest structure according to the second adjustment direction (X), the second locking device (32) being elastically biased towards the horizontal locking position independently of the first locking device (19), - a setting position horizontal where said second locking device (32) 10 does not interfere with said headrest structure (11), so as to allow a displacement of said structure of a in the second adjusting direction (X), a user actuatable control member (8) for simultaneously unlocking the first and second locking devices (19, 32), said control member (8) being movable between: - an actuating position where said control member (8) moves the first locking device (19) in the height adjustment position and the second locking device (32) in the horizontal adjustment position, a rest position where said control member (8) does not interfere with the first locking device (19) and the second locking device (32). 2. A headrest according to claim 1, further comprising first and second transmission members (27, 30) on which the control member (8) is adapted to act when actuated, the first lock (19) having a first locking member (21) adapted to engage the pin (7) when the first locking device (19) is in a locking position in height, the first locking member ( 21) being mechanically connected to the first transmission member (27) such that said first locking member (21) is disengaged from the pin (27) when the control member (8) is in the actuating position, the second locking device (32) having a second locking member (33) adapted to engage the headrest structure (11) when the second locking device (32) is in the horizontal locking position, the second locking member (33) being mechanically connected to the second transmission member (30) such that said second locking member (33) is disengaged from the headrest structure (11) when the control member ( 8) is in the actuating position. The headrest according to claim 2, wherein the actuating member (8) and the first and second transmission members (27, 30) are slidably mounted independently of each other parallel to a third direction (Y). ) substantially perpendicular to the first and second adjustment directions (Z, X), the actuating member (8) being adapted to urge the first and second transmission members (27, 30) when said control member is actuated. 4. The headrest according to claim 3, wherein the headrest structure (11) at least partially encloses the support (9) and the control member (8) is mounted on said support structure. head (11), the control member (8) and the first and second transmission members (27, 30) being sufficiently wide in the second direction of adjustment (X) so that the control member (8) is at At least partially opposite each of the first and second transmission members (27, 30) regardless of the adjustment of the headrest structure (11) in the second adjustment direction (X). 5 Headrest according to any one of claims 2 to 4, wherein the pin (7) has notches (7a) and the first locking member (21) is a first branch belonging to a spring wire (20). connected to the first transmission member (27), the first leg (21) extending perpendicularly to the first adjustment direction (Z) between first and second ends. The headrest according to claim 5, wherein said spring wire (20) further comprises second and third legs (22, 23) respectively extending the first and second ends of the first leg (21), the second leg (22) resiliently biasing the first leg (21) toward the vertical lock position and the third leg (23) being connected to the first transmission member (27) so as to be disengaged from the notches (7a) of the pin when the control member (8) is in the actuating position. 7. A headrest according to claim 6, wherein the headrest comprises two parallel pins (7) provided with notches (7a) and an unlocking member (26) pivotally mounted about a pivot axis ( ZO) perpendicular to the third direction (Y), the first transmission member (27) being arranged to pivot the unlocking member (26) in an unlocked position when said transmission member is moved by actuating the control member (8), and the first locking device (19) comprises two spring wires (20) each having: - a first leg (21) adapted to engage in the notches (7a) of a pins (7), - a second leg (22) elastically biasing the first leg (21) towards the corresponding pin (7), and a third leg (23) connecting the first leg (21) to the pin unlocking (26), the respective third branches (23) of the two wires 10 springs (20) being connected to the unlocking member (26) at points (26a) substantially diametrically opposite on either side of the pivot axis (ZO) so that said unlocking member (26) disengages the first branches (21) of the notches (7a) of the two pins 15 when said unlocking member (26) is pivoted into the unlocking position. Headrest according to any one of claims 3 to 7, wherein the second transmission member (30) comprises a rack (31) extending in the third direction (Y), the second locking member ( 33) is pivotally mounted on the support (9) along an axis of rotation (XO) parallel to the second direction of adjustment (X) and has a toothing (35) in an arc of a circle meshing with said rack (31), said second locking member (33) having, on only a part of its periphery, a plurality of fins (34) aligned in the second direction of adjustment (X) and selectively adapted, to penetrate into corresponding slots (37). arranged in the headrest structure (11) when the second locking device (32) is in the horizontal locking position, or disengaging from said slots (37) when the second locking device (32) is in the adjustment position horiz Ontal. 35 3036666 22 The headrest according to claim 8, wherein the headrest structure comprises at least one guide arm (15) extending in the second direction of adjustment (X), sliding in a fixed guide (17). of the support (9), said slots (37) being formed in said guide arm (15). 10. Seat comprising a seat (3), a backrest (2) and a headrest (6) according to any one of the preceding claims, the spindle (7) is mounted on the backrest (2). 15