FR2837150A1

FR2837150A1 - Motor vehicle seat head rest has springs to return supporting frame to upright position from folded position when seat back is raised

Info

Publication number: FR2837150A1
Application number: FR0203234A
Authority: FR
Inventors: Frederic Pineau; Joel Canteleux
Original assignee: Faurecia Sieges dAutomobile SAS
Current assignee: Faurecia Sieges dAutomobile SAS
Priority date: 2002-03-15
Filing date: 2002-03-15
Publication date: 2003-09-19
Anticipated expiration: 2022-03-15
Also published as: FR2837150B1

Abstract

The head rest has an inner supporting frame (13) connected to a folding seat back by one or more rods (12) in sleeves (10) with a cross-member (11), and articulated joints (14) that allow it to be stowed when the seat back is folded forwards behind a front seat. The articulated joints contain springs and locks that return the head rest automatically to its upright position when the seat back is raised. Each lock is in the form of a plate with a hole and slot for a pivot pin.

Description

moins l'une des faces en bout du manchon.minus one of the end faces of the sleeve.

28371 5028371 50

Appuie-tete pour siege de vehicule automobile et sieges munis de tels appuie-tete La presente invention est relative aux appuie-tete pour siege de vehicule automobile et aux sieges munis de Headrest for motor vehicle seat and seats fitted with such headrests The present invention relates to headrests for motor vehicle seats and to seats fitted with headrests.

tels appuie-tete.such headrest.

Plus particulierement, l' invention concerne un appuie-tete pour un siege de vehicule automobile comportant un dossier, cet appuie-tete comprenant: - au moins une broche s'etendant longitudinalement selon un premier axe et adaptee pour etre liee au dossier, - une armature adaptee pour retenir la tete ou le cou d'un passager assis sur le siege, - au moins une articulation, cheque articulation etant intercalee entre une broche et ['armature, pour permettre une rotation de l' armature par rapport a cette broche, autour d'un deuxieme axe sensiblement perpendiculaire au premier axe, entre une position de rangement et une position d'utilisation, - des moyens de rappel elastiques adaptes pour exercer une force de rappel entre au moins une broche et l' armature, et - de s moyens de verroui l lage adapt e s pour coope rer avec au moins une broche et l' armature pour bloquer, en position d'utilisation, la rotation de l' armature par More particularly, the invention relates to a headrest for a motor vehicle seat comprising a backrest, said headrest comprising: at least one spindle extending longitudinally along a first axis and adapted to be connected to the backrest; armature adapted to retain the head or neck of a passenger sitting on the seat, - at least one hinge, each hinge being interposed between a pin and ['armature, to allow rotation of the frame relative to this pin, around a second axis substantially perpendicular to the first axis, between a storage position and a position of use, - resilient return means adapted to exert a restoring force between at least one pin and the armature, and s locking means adapted to cooperate with at least one pin and the armature for locking, in the use position, the rotation of the armature by

rapport a chaque broche.report to each pin.

Le document FR 2 476 001 decrit un exemple d'un tel appuie-tete, dans lequel les moyens de verrouillage vent constitues d'un tube solidaire du dossier, dans loquel peuvent etre introduites une broche, l' articulation et une partie de l' armature de maniere a bloquer l' armature. Pour mouvoir l'appuie-tete de sa position d'utilisation a sa position de rangement, il faut firer l'appuie-tete vers le haut de maniere a degager l' articulation du tube. On FR 2 476 001 describes an example of such a headrest, wherein the locking means wind consists of a tube integral with the backrest, in which can be introduced a pin, the joint and a part of the frame to block the frame. To move the headrest from its operating position to its storage position, the headrest must be slid upwards in order to disengage the tube joint. We

bascule, autour de l' articulation ainsi liberee, l'appuie- tilts, around the joint thus released, the support

tete vers l' avant pour l'amener en position de rangement Pour ramener l'appuie-tete de sa position de rangement a la position d'utilisation, il faut faire la manipulation inverse. Un but de la presente invention a notamment pour but de simplifier l'utilisation et la manipulation d'un tel appuie-tete. A cet effet, il est prevu, selon l' invention, un appuietete du genre en question, caracterise par le fait les moyens de rappel elastiques ramenent automatiquement, grace a la force de rappel, ['armature de la position de head forward to storage position To return the headrest from its storage position to the operating position, reverse the operation. An object of the present invention is in particular to simplify the use and handling of such a headrest. For this purpose, it is provided, according to the invention, a supportetete of the kind in question, characterized by the fact the elastic return means automatically reduce, thanks to the restoring force, the armature of the position of

rangement vers la position d'utilisation. storage to the position of use.

Grace a ces dispositions, la manipulation de l'appuie-tete selon l' invention se trouve simplifiee. En effet, le passage de la position de rangement a la position Thanks to these provisions, the handling of the headrest according to the invention is simplified. Indeed, the transition from the storage position to the position

d'utilisation s'effectue automatiquement. of use is done automatically.

Dans des modes de real i s at ion pre feres de ['invention, on peut eventuellement avoir recours en outre a l'une et/ou a l'autre des dispositions suivantes: - les moyens de rappel elastiques amenent automatiquement, lorsque l' armature revient de la position de rangement en position d'utilisation, les moyens de verrouillage dans une position verrouillee dans laquelle ils cooperent avec au moins une broche et l' armature pour bloquer la rotation de l' armature par rapport a chaque broche; - l'armature est rigidement solidaire des moyens de verrouillage; - les moyens de verrouillage comprennent une platine percee d'une ouverture en forme de trou de serrure, avec une zone oblongue ouverte sur une zone circulaire ayant un diametre superieur a la largeur de la zone oblongue i - au moins une broche comporte un teton s'etendant longitudinalement sensiblement parallelement au deuxieme axe et ayant une forme sensiblement cylindrique avec un diametre externe sensiblement inferieur au diametre de la zone circulaire de l'ouverture des moyens de verrouillage, de maniere a ce qu'il puisse tourner autour du troisieme axe dans cette zone circulaire, ce teton comportant en outre deux meplats s'etendant chacun dans un plan parallele aux premier et deuxieme axes et disposes symetriquement de part et d'autre du troisieme axe, la distance entre ces meplats etant sensiblement inferieure a la largeur de la zone oblongue de ltouverture des moyens de verrouillage, de maniere a ce que le teton puisse etre engage dans la zone oblongue mais que la rotation du teton dans cette zone oblongue, autour du deuxieme axe, soit bloquee; - la force de rappel exercee par les moyens de rappel elastiques ramene automatiquement la zone oblongue au niveau du teton; - la zone circulaire est amenee au niveau du teton en exercant une force, sur ['armature, opposee a la force de rappel exercee par les moyens de rappel elastiques; et - les moyens de rappel elastiques comprennent un ressort en forme de spirale avec une extremite libre radialement externe, ce ressort etant, lorsqu'il est contraint, en appui sur les moyens de verrouillage, de maniere a exercer, sur ces moyens de verrouillage, une force In some embodiments of the invention, it is possible to use one and / or the other of the following additional provisions: the elastic return means automatically feeds, when the reinforcement returns from the storage position in the position of use, the locking means in a locked position in which they cooperate with at least one pin and the frame to block the rotation of the armature relative to each pin; - The armature is rigidly secured to the locking means; the locking means comprise a plate pierced with a keyhole-shaped opening, with an oblong zone open on a circular zone having a diameter greater than the width of the oblong zone; at least one pin comprises a teton; extending longitudinally substantially parallel to the second axis and having a substantially cylindrical shape with an outer diameter substantially smaller than the diameter of the circular zone of the opening of the locking means, so that it can rotate about the third axis in this circular zone, this teton further comprising two flattened each extending in a plane parallel to the first and second axes and arranged symmetrically on either side of the third axis, the distance between these plates being substantially smaller than the width of the zone oblong opening of the locking means, so that the teton can be engaged in the oblong zone but the rotation of the t in this oblong zone, around the second axis, be blocked; - The restoring force exerted by the elastic return means automatically returns the oblong zone at the teton; the circular zone is brought to the level of the teton by exerting a force, on the armature, opposite to the restoring force exerted by the elastic return means; and the elastic return means comprise a spiral-shaped spring with a radially external free end, this spring being, when it is constrained, bearing on the locking means, so as to exert, on these locking means, a force

de rappel tendant a eloigner ['armature de chaque broche. recalling tending to distance ['armature of each pin.

Selon un autre aspect, l' invention concerne un siege de vehicule automobile comportant un dossier muni d'un appuie-tete tel que caracterise ci-dessus, et dans lequel le dossier est rabattable entre une position redressee, dans laquelle la rotation de l' armature par rapport a chaque broche est bloquee par les moyens de verrouillage, et une position rabattue dans laquelle la rotation de ['armature par rapport a chaque broche est bloquee par un element According to another aspect, the invention relates to a motor vehicle seat having a backrest provided with a headrest as characterized above, and wherein the backrest is foldable between a rectified position, in which the rotation of the reinforcement relative to each pin is blocked by the locking means, and a folded position in which the rotation of the armature relative to each pin is blocked by an element

choisi parmi l'assise de ce siege et un autre siege. chosen from the seat of this seat and another seat.

D'autres aspects, buts et avantages de l' invention Other aspects, purposes and advantages of the invention

apparaltront a la lecture de la description de deux will appear on reading the description of two

de ses modes de realisation.of its modes of realization.

L' invention sera egalement mieux comprise a l' aide des dessins, sur lesquels: - la figure 1 represente schematiquement, en perspective, un exemple de siege conforme a la presente invention; - la figure 2 represente schematiquement, en perspective, la structure d'un appuie-tete selon l' invention tel que ceux equipant le siege represente a la figure 1, cet appuie-tete etant en position d'utilisation; - la figure 3 correspond a une vue analogue a celle de la figure 2, sur laquelle une partie de la structure de l'appuie-tete selon l' invention a ete retiree i - la figure 4 represente, selon une vue tournee de par rapport a celles des figures 2 et 3, la structure de l'appuie-tete representee sur les figures 2 et 3 sur laquelle d'autres elements ont ete retires; - la figure 5 represente, selon une vue analogue a celle de la figure 4, l'appuie-tete represente sur les figures 2 a 4, dans une position intermediaire entre la position d'utilisation et la position de rangement; - la figure 6 represente, selon une vue analogue a celle des figures 4 et 5, l'appuie-tete represente sur les figures 2 a 5, en position de rangement; - la figure 7 represente l'appuie-tete des figures 2 a 6, dans la meme position que celle correspondent a la figure 6, mais tournee de 180 par rapport a cette derriere; - la figure 8 represente schematiquement, en vue de cote, le siege de la figure 1, avec l'appuie- tete represente en position d'utilisation et en position de rangement i - la figure 9 represente un autre exemple de siege conforme a la presente invention, en position d'utilisation, selon une vue analogue a celle de la figure 8; et - la figure 10 represente le siege de la figure 9, The invention will also be better understood with the aid of the drawings, in which: FIG. 1 schematically represents, in perspective, an example of a seat according to the present invention; - Figure 2 schematically shows, in perspective, the structure of a headrest according to the invention such as those equipping the seat shown in Figure 1, the headrest being in the use position; FIG. 3 corresponds to a view similar to that of FIG. 2, in which a part of the structure of the headrest according to the invention has been removed; FIG. 4 represents, according to a rotated view of to those of Figures 2 and 3, the structure of the headrest shown in Figures 2 and 3 on which other elements have been removed; - Figure 5 shows, in a similar view to that of Figure 4, the headrest shown in Figures 2 to 4, in an intermediate position between the use position and the storage position; - Figure 6 shows, in a view similar to that of Figures 4 and 5, the headrest shown in Figures 2 to 5, in the storage position; - Figure 7 shows the headrest of Figures 2 to 6, in the same position as that of Figure 6, but rotated 180 relative to this rear; FIG. 8 is a schematic side view of the seat of FIG. 1, with the headrest shown in the position of use and in the storage position; FIG. 9 shows another example of a seat according to FIG. present invention, in use position, according to a view similar to that of Figure 8; and FIG. 10 represents the seat of FIG. 9,

en position de rangement.in storage position.

Sur les differentes figures, les memes references On the different figures, the same references

designent des elements identiques ou similaires. design identical or similar elements.

Un mode de realisation d'un siege conforme a la presente invention est decrit ci-dessous de maniere detaillee. Selon ce mode, represente sur la figure 1 en position d'utilisation, il s'agit d'un siege 1 de type banquette arriere comportant deux parties: l'une de ces parties correspondent a deux places de passagers et l'autre An embodiment of a seat according to the present invention is described below in detail. According to this mode, shown in Figure 1 in the position of use, it is a seat 1 type back seat with two parts: one of these parts correspond to two passenger seats and the other

partie correspondent a une place.part correspond to a place.

A titre d'exemple, c'est la partie correspondent a As an example, it is the part corresponding to

une place de passager qui est decrite ci-dessous. a passenger seat that is described below.

Cette partie comporte une assise 2 et un dossier 3. This part comprises a seat 2 and a backrest 3.

En position d'utilisation, l'assise 2 s'etend sensiblement selon un troisieme axe X sensiblement horizontal, entre une extremite arriere 4 et une extremite avant 5. Touj ours en position d'utilisation, le dossier 3 s'etend sensiblement selon un premier axe Z vertical, entre une extremite basse 6 In the position of use, the seat 2 extends substantially along a third substantially horizontal axis X, between a rear end 4 and a front end 5. Always in the position of use, the backrest 3 extends substantially according to a first vertical axis Z, between a low end 6

et une extremite haute 7.and a high end 7.

Un appuie-tete 8 est fixe a l'extremite haute 7 du dossier 3. Cet appuietete 8 est garni d'une matelassure recouverte d'une coiffe 9. L'appoletete 8 est adapte pour retenir la tete ou le coup d'un passager assis sur le siege 1. La figure 2 represente cet appuie-tete 8 depourvu de sa colffe 9 et de sa matelassure, engage dans des fourreaux solidaires d'une traverse 11 de la structure du dossier 3, egalement representee depourvue de coiffe et de matelassure. L'appuie-tete 8 comporte deux broches 12 reliees entre elles par une armature 13 ayant globalement une forme de U. Chaque broche 12 s'etend longitudinalement selon le premier axe Z et est engagee dans l'un des fourreaux 10 dans lequel elle peut etre reglee en hauteur, par deplacement selon le premier axe Z. Chaque extremite libre du U est reliee a l'une des deux broches 12 par l'intermediaire d'une A headrest 8 is fixed at the upper end 7 of the backrest 3. This support 8 is lined with a padding covered with a cap 9. The appoletete 8 is adapted to hold the head or the stroke of a passenger seated on the seat 1. FIG. 2 represents this headrest 8 without its collar 9 and its padding, engages in sleeves secured to a cross member 11 of the backrest structure 3, also shown without a cap and padding . The headrest 8 comprises two pins 12 connected together by a frame 13 having a generally U-shaped shape. Each pin 12 extends longitudinally along the first axis Z and is engaged in one of the sleeves 10 in which it can be adjusted in height, by displacement along the first axis Z. Each free end of the U is connected to one of the two pins 12 by means of a

articulation 14.articulation 14.

Chaque articulation 14 est enfermee dans une coque Each hinge 14 is enclosed in a hull

15. Chaque coque 15 comporte un couvercle 16. 15. Each shell 15 has a lid 16.

La figure 3 represente l'appuie-tete 8 avec une articulation 14 (a gauche sur le dessin) depourvue de couvercle 16 et l'autre articulation 14 (a droite sur le Figure 3 shows the headrest 8 with a hinge 14 (left in the drawing) without cover 16 and the other hinge 14 (on the right on the

dessin) completement depourvue de coque 15. drawing) completely devoid of hull 15.

Chaque coque 15 comporte, autour de la broche 12, une ouverture 17 s'etendant selon un arc de cercle, dans un plan sensiblement parallele aux axes X et Z. Ces ouvertures 17 permettent de faire basculer l' armature 13 autour d'un deuxieme axe Y. sensiblement horizontal et perpendiculaire aux premier Z et troisieme X axes. Le pourtour de chaque ouverture 17 est muni de rebords 18 perces de trous destines a l'accrochage de la matelassure de l'appuie-tete 8 et de sa Each shell 15 comprises, around the spindle 12, an opening 17 extending along an arc of a circle, in a plane substantially parallel to the axes X and Z. These openings 17 make it possible to tilt the armature 13 around a second Y axis substantially horizontal and perpendicular to the first Z and third X axes. The perimeter of each opening 17 is provided with flanges 18 holes of holes intended for the attachment of the padding of the headrest 8 and its

coiffe 9.cap 9.

Les deux articulations 14 etant identiques, une The two joints 14 being identical, one

seule d'entre elles est decrite ci-dessous. only one of them is described below.

Comme representee sur la figure 3, chaque articulation 14 comporte des moyens de verrouillage comprenant une platine 19, un pivot 20 et des moyens de rappel elastiques, constitues dans le cas present d'un As shown in FIG. 3, each hinge 14 comprises locking means comprising a plate 19, a pivot 20 and resilient return means, constituted in this case by a

ressort 21.spring 21.

La platine 19 comporte un flasque 22, une gouttiere The plate 19 comprises a flange 22, a gutter

23 et une butee 24.23 and a stop 24.

Le flasque 22 stetend dans un plan sensiblement perpendiculaire au deuxieme axe Y. Le flasque 22 comporte une ouverture 25 en forme de trou de serrure, avec une zone oblongue 26 ouverte sur une zone circulaire 27 (voir figure 4). Cette zone circulaire 27 a un diametre superieur a la The flange 22 extends in a plane substantially perpendicular to the second axis Y. The flange 22 has an opening 25 in the form of a keyhole, with an oblong zone 26 open on a circular zone 27 (see Figure 4). This circular zone 27 has a diameter greater than the

largeur de la zone oblongue 26.width of the oblong zone 26.

La gouttiere 23 comporte deux parois 28 s'etendant The gutter 23 has two walls 28 extending

dans des plans sensiblement perpendiculaires au flasque 22. in planes substantially perpendicular to the flange 22.

La gouttiere 23 maintient de maniere rigide, entre ses deux The gutter 23 maintains rigidly between its two

parois 28, l'une des extremites libres de l' armature 13. walls 28, one of the free ends of the frame 13.

La butee 24 s'etend perpendiculairement au flasque 22, du meme cote de cette platine 19 que les parois 28 et le pivot 20. Avantageusement, la butee 24 est en continuite de matiere avec l'une des parois 28. La butee 24 comporte une surface d'appui 29 sensiblement perpendiculaire au premier axe Z. lorsque l'appuie-tete 8 est en position d'utilisation. L'extremite de chaque broche 12 est aplatie selon la direction Y. Le pivot 20 s'etend selon la direction Y. Il The stop 24 extends perpendicularly to the flange 22, on the same side of this plate 19 as the walls 28 and the pivot 20. Advantageously, the stop 24 is in continuity of material with one of the walls 28. The stop 24 has a bearing surface 29 substantially perpendicular to the first axis Z. when the headrest 8 is in the position of use. The end of each pin 12 is flattened in the direction Y. The pivot 20 extends in the direction Y. It

est fixe a la broche 12 dans la region ou elle est aplatie. is fixed to pin 12 in the area where it is flattened.

Le pivot 20 a une forme oblongue en coupe transverse. Il comporte une surface externe longitudinale avec deux premiers meplats 30 paralleles l'un a l'autre et a la hauteur de la forme oblongue de la coupe transverse du pivot The pivot 20 has an oblong shape in transverse section. It comprises a longitudinal outer surface with two first flats 30 parallel to each other and at the height of the oblong shape of the cross section of the pivot.

(voir figure 3).(see Figure 3).

Le ressort 21 a une forme de spirale. Il est enroule autour du pivot 20. Il comporte une partie bloquee en rotation grace aux premiers meplats 30. Cette partie correspond a l'extremite radialement la plus interne du ressort 21. L'autre extremite presente une forme de languette 31. Cette partie correspond a l'extremite radialement la plus externe du ressort 21. La languette 31 prend appui sur la surface d'appui 29, que l'appuie-tete soit en position d'utilisation ou en position de rangement. Comme represente sur la figure 4, le pivot 20 se pour-quit de l'autre cate de la platine 19, par rapport au ressort 21 par un teton 32. Ce teton 32 comporte deux deuxiemes meplats 33. Ces deux meplats 33 s'etendent, parallelement l'un a l'autre, dans un plan parallele au premier Z et au deuxieme Y axe. Ils vent disposes symetriquement de part et d'autre de ce troisieme axe Y. La distance entre les deux deuxiemes meplats 33 est The spring 21 has a spiral shape. It is wound around the pivot 20. It comprises a portion locked in rotation by the first flat 30. This part corresponds to the radially innermost end of the spring 21. The other end has a tongue shape 31. This part corresponds at the radially outermost end of the spring 21. The tongue 31 bears on the bearing surface 29, the headrest is in the use position or in the storage position. As shown in Figure 4, the pivot 20 extends from the other cate of the plate 19, relative to the spring 21 by a teton 32. This teton 32 comprises two second mplates 33. These two meplats 33 extend , parallel to each other, in a plane parallel to the first Z and the second Y axis. They are arranged symmetrically on either side of this third axis Y. The distance between the two second layers 33 is

sensiblement inferieure a la largeur de la zone oblongue 26. substantially less than the width of the oblong zone 26.

Le teton 32 peut done etre engage dans cette zone oblongue 26. Mais sa rotation, autour du troisieme axe Y. dans cette The teton 32 can therefore be engaged in this oblong zone 26. But its rotation, around the third axis Y. in this

zone oblongue 26 est bloquee.oblong zone 26 is blocked.

Lorsque l'appuie-tete 8 est en position d'utilisation, le ressort 21 exerce une force de rappel qui When the headrest 8 is in the position of use, the spring 21 exerts a restoring force which

tense a maintenir la zone oblongue 26 au niveau du teton 32. to maintain the oblong zone 26 at the teton 32.

Comme represente sur la figure 5, pour deverrouiller As shown in Figure 5, to unlock

chaque articulation 14, il suffit d'appuyer sur l'appuie- each articulation 14, it suffices to press on the support

tete 8, vers le teas parallelement au premier axe Z. contre la force de rappel exercee par le ressort 21. Ainsi, la zone circulaire 27 est amenee au niveau du teton 32. Les tetons 32 des broches 12 etant respectivement au niveau d'une zone circulaire 27, l'utilisateur peut faire basculer, a la fois vers l' avant et vers le teas, l'appuie-tete 8 dans la head 8, towards the teas parallel to the first axis Z. against the restoring force exerted by the spring 21. Thus, the circular zone 27 is brought to the level of the teat 32. The pins 32 of the pins 12 being respectively at a level of circular zone 27, the user can tilt, both forward and towards the teas, the headrest 8 in the

position de rangement representee sur les figures 6 et 7. storage position shown in Figures 6 and 7.

Dans cette position de rangement, le ressort 21 est davantage contraint que dans la position d'utilisation In this storage position, the spring 21 is more constrained than in the position of use

correspondante aux figures 1 a 5 deja decrites. corresponding to Figures 1 to 5 already described.

Le basculement de l'appuie-tete 8 de la position d'utilisation a la position de rangement est represente egalement sur les figures 8, 9 et 10 sur lesquelles elles vent referencees respectivement U et R. Le maintien de l'appuie-tete 8 en position de rangement est realise en abaissant le dossier 3 de sa position redressee (en pointille sur la figure 8) vers sa position rabattue (en trait plein sur la figure 8). Lorsque le dossier 3 du siege arriere 1 est en position rabattue avec l'appuie-tete 8 en position de rangement, le dossier 34 d'un siege avant 35 empeche l'appuietete 8 de revenir en position d'utilisation. Le fait que l'appuie-tete 8 puisse etre bascule en position de rangement permet de reduire la distance entre le siege arriere 1 et le siege avant 35, sans pour autant voir a retirer l'appuie-tete 8. Cette disposition permet egalement d'eviter que l'appuie-tete 8 ne soit endommage ou sali, comme ce pourrait etre le cas stil devait etre ote du dossier 3, avant de ramener ce dernier en The tilting of the headrest 8 from the position of use to the storage position is also shown in Figures 8, 9 and 10 on which they refer respectively U and R. The maintenance of the headrest 8 in the storage position is achieved by lowering the backrest 3 from its upright position (dotted in Figure 8) to its folded position (solid line in Figure 8). When the backrest 3 of the rear seat 1 is in the folded position with the headrest 8 in the storage position, the backrest 34 of a front seat 35 prevents the seat 8 from returning to the position of use. The fact that the headrest 8 can be tilted in the storage position reduces the distance between the rear seat 1 and the front seat 35, without having to remove the headrest 8. This provision also allows d avoid that the headrest 8 is damaged or soiled, as it could be if it were to be removed from the file 3, before bringing it back into

position rabattue.folded position.

Selon une variante du siege 1 decrit ci-dessus, celui-ci comporte une assise 2 adaptee pour pouvoir etre basculee d'une position d'utilisation (correspondent a la figure 9) dans laquelle elle s'etend sensiblement horizontalement selon le troisieme axe X, dans une position basculee (correspondent a la figure 10) dans laquelle elle s'etend sensiblement verticalement selon le premier axe Z. Selon cette deuxieme variante, loraque le dossier 3 est en position rabattue, comme illustre par la figure 10, c' est le dessous de l'assise 2 qui empeche l 'appuie-tete 8 de revenir de sa position de rangement a sa position According to a variant of the seat 1 described above, it comprises a seat 2 adapted to be tilted from a position of use (correspond to Figure 9) in which it extends substantially horizontally along the third axis X in a tilted position (correspond to FIG. 10) in which it extends substantially vertically along the first axis Z. According to this second variant, when the backrest 3 is in the folded position, as illustrated by FIG. 10, it is the underside of the seat 2 which prevents the headrest 8 from returning from its storage position to its position

d'utilisation.use.

Pour les deux variantes decrites ci-dessus, le fait de redresser le dossier 3 de la positon rabattue (en trait plein sur les figures 8 et 10) a la position redressee (en trait pointille sur les figures 8 et 10 et en trait plein sur la figure 9) libere l'appuie-tete 8 qui revient alors automatiquement, sous l'effet de la force de rappel du For the two variants described above, the straightening of the backrest 3 of the folded position (in solid lines in FIGS. 8 and 10) has the straightened position (in dotted line in FIGS. 8 and 10 and in solid line on 9) releases the headrest 8 which then returns automatically, under the effect of the restoring force of the

ressort 21, en position d'utilisation. spring 21, in the position of use.

Selon encore une autre variante, le siege 1 selon l' invention est un siege avant et l'appuie-tete 8 est bloque en position de rangement, par exemple, sous le tableau de According to yet another variant, the seat 1 according to the invention is a front seat and the headrest 8 is locked in the storage position, for example, under the table of

bord du vehicule sur lequel ce siege avant est monte. edge of the vehicle on which this front seat sits.

Selon encore d'autres variantes, l'appuie-tete 8 selon l' invention peut ne comporter des moyens de rappel elastiques 21 que sur une articulation 14. Il peut meme ne According to still other variants, the headrest 8 according to the invention may comprise elastic return means 21 only on a hinge 14. It may not even

comporter qu'une broche 12 et qu'une articulation 14. comprise a pin 12 and a hinge 14.

Le siege 1 selon l' invention decrit ci-dessus a pour avantage d'etre simple de construction et peu onereux a The seat 1 according to the invention described above has the advantage of being simple and inexpensive construction a

realiser, tout en ayant un encombrement reduit. achieve, while having a reduced footprint.

Claims

1. Headrest for a motor vehicle seat comprising a backrest (3), this headrest comprising: - at least one spindle (12) extending longitudinally along a first axis (Z) and adapted to be connected to the backrest (3), - a frame (13) adapted to retain the head or neck of a passenger sitting on the seat (1), - at least one hinge (14), each hinge (14) being interposed between a pin ( 12) and the armature (13), to allow a rotation of the armature (13) with respect to this pin (12), around a second axis (Y) substantially perpendicular to the first axis (Z), between a storage position and a position of use, - resilient return means (21) adapted to exert a restoring force between at least one pin (12) and the armature (13), and - locking means (19). ) adapted to cooperate with at least one pin (12) and ['armature (13) to block, in use position, the rotation of the armature (13) with respect to each e spindle (12), characterized by the fact that the elastic return means (21) automatically return, thanks to the restoring force, ['armature (13) from the storage position to the position of use.

2. Headrest according to claim 1, wherein the elastic return means (21) automatically, when the armature (13) returns from the storage position in the use position, the locking means (19) in a locked position in which they cooperate with at least one pin (12) and the frame (13) to block the rotation of the frame (13)

relative to each pin (12).

Headrest according to one of the claims

preceding, wherein the armature (13) is rigidly secured to the locking means (19).

4. A headrest according to claim 3, wherein the locking means comprise a plate (19) pierced with a keyhole opening (25), with an oblong zone (26) open on a circular zone ( 27) having a diameter greater than the width of the zone

oblong (26).

A headrest according to claim 4, wherein at least one pin (12) has a teton (32) extending longitudinally substantially parallel to the second axis (Y) and having a substantially cylindrical shape with an outer diameter substantially less than diameter of the circular zone (27) of the opening (25) of the locking means (19), so that it can turn about the third axis (Y) in this circular zone (27), this teton (32) further comprising two flats (33) each extending in a plane parallel to the first (Z) and second (Y) axes and arranged symmetrically on either side of the teton (32), the distance between these flats (33) being substantially less than the width of the oblong zone (26) of the opening (25) of the locking means (19), so that the teton (32) can be engaged in the oblong zone (26) but that the rotation of the teton (32) in this oblong zone (29), around the second axis

(Y), either blocked.

6. Headrest according to claim 5, wherein the restoring force exerted by the elastic return means (21) automatically returns the oblong zone (26).

at the level of the teton (32).

Headrest according to one of claims 5 and

6, in which the zone (27) is brought to the level of the teton (32) by exerting a force on the armature (13) opposing the restoring force exerted by the elastic return means (21).

Headrest according to one of the claims

preceding, in which the elastic return means comprise a spring (21) in the form of a spiral with a free end (31) radially external, this spring (21) being, when forced, bearing on the locking means (19) , so as to exert, on these locking means (19), a return force tending to move away

the armature (13) of each spindle (12).

9. Motor vehicle seat comprising a backrest (3) provided with a headrest (8) according to one of the

preceding claims, this file (3) being foldable

between a rectified position, in which the rotation of the armature (13) with respect to each pin (12) is blocked by the locking means (19), and a folded position in which the rotation of the armature (13) relative to each pin (12) is blocked by an element selected from the seat (2) of this seat (1) and another seat