FR2982545A1

FR2982545A1 - Headrest for seat of motor vehicle, has grip fitted on metallic tubular structure in central part so as to enclose tubular structure, so that reinforcement plate is mounted in articulation with respect to structure

Info

Publication number: FR2982545A1
Application number: FR1160385A
Authority: FR
Inventors: David Ganier; Christian Delus
Original assignee: Centre dEtude et de Recherche pour lAutomobile CERA
Current assignee: Cera TSC
Priority date: 2011-11-15
Filing date: 2011-11-15
Publication date: 2013-05-17
Anticipated expiration: 2031-11-15
Also published as: FR2982545B1

Abstract

The headrest (1) has a metallic tubular structure (2) formed in inverted U shape and assembled at a backrest of a seat. A reinforcement plate (3) is provided for reinforcing a cushion. A grip (4) made of a metal sheet folded in U shape is associated with the reinforcement plate. The grip is fitted on the structure in a central part (5) so as to enclose the structure, so that the plate is mounted in articulation with respect to the structure. A sliding ring (6) made of plastic material is placed between the grip and the structure. The ring is in form of a sleeve equipped with an axial slot (7).

Description

L'invention concerne un appui tête de siège de véhicule automobile. Il est connu de réaliser un appui tête de siège de véhicule automobile, ledit appui tête comprenant : - une structure tubulaire métallique de montage au dossier dudit siège, - un coussin d'appui, - une plaque d'armature dudit coussin, - une pince en tôle métallique repliée en U qui est associée à ladite plaque et emboitée dans sa partie centrale sur ladite structure de manière à l'enserrer, de sorte que ladite plaque soit montée en articulation par rapport à ladite structure. Le fait que la pince enserre la structure tubulaire permet de réaliser un réglage angulaire de la plaque, et donc du coussin, qui reste dans la position angulaire de confort choisie du fait du couple de frottement s'exerçant entre ladite pince et ladite structure. Dans les réalisations connues, la structure tubulaire est notamment pourvue d'un revêtement de chrome ou de peinture déposée par cataphorèse. The invention relates to a motor vehicle headrest support. It is known to make a headrest of a motor vehicle seat, said headrest comprising: a metal tubular structure for mounting the back of said seat, a support cushion, a reinforcing plate of said cushion, a clamp U-folded sheet metal which is associated with said plate and interlocked in its central portion on said structure so as to grip it, so that said plate is hinged relative to said structure. The fact that the clamp encloses the tubular structure allows for an angular adjustment of the plate, and therefore the cushion, which remains in the selected comfort angular position because of the friction torque exerted between said clamp and said structure. In known embodiments, the tubular structure is in particular provided with a coating of chromium or paint deposited by cataphoresis.

Au cours de l'utilisation de l'appui tête, le revêtement est sujet à une dégradation liée aux rotations répétées exercées sur la pince créant une usure dudit revêtement. During the use of the headrest, the coating is subject to degradation due to repeated rotations exerted on the clamp creating a wear of said coating.

Il en résulte une diminution progressive du couple de frottement entre la pince et la structure, qui risque de s'avérer à terme insuffisant pour permettre au coussin de rester dans la position de confort choisie par l'utilisateur. L'invention a pour but de pallier cet inconvénient. This results in a gradual decrease in the friction torque between the clamp and the structure, which may eventually prove to be insufficient to allow the cushion to remain in the comfort position chosen by the user. The invention aims to overcome this disadvantage.

A cet effet, l'invention propose un appui tête de siège de véhicule automobile, ledit appui tête comprenant : - une structure tubulaire métallique de montage au dossier dudit siège, - un coussin d'appui, - une plaque d'armature dudit coussin, - une pince en tôle métallique repliée en U qui est associée à ladite plaque et emboitée dans sa partie centrale sur ladite structure de manière à l'enserrer, de sorte que ladite plaque soit montée en articulation par rapport à ladite structure, ledit appui tête comprenant en outre une bague de glissement en matière plastique disposée entre ladite pince et ladite structure. For this purpose, the invention proposes a motor vehicle headrest support, said headrest comprising: a metal tubular structure for mounting on the back of said seat, a support cushion, a reinforcing plate for said cushion, a collet made of folded U-shaped metal sheet which is associated with said plate and interlocked in its central part on said structure so as to grip it, so that said plate is mounted in articulation with respect to said structure, said headrest comprising in addition a plastic sliding ring disposed between said clamp and said structure.

Avec l'agencement proposé, la dégradation du revêtement de la structure, liée au frottement de la pince sur ladite structure, devient alors inexistante, ce qui a pour conséquence une non dégradation, dans le temps, du couple de frottement. With the proposed arrangement, the degradation of the coating of the structure, linked to the friction of the clamp on said structure, then becomes non-existent, which results in a non-degradation, over time, of the friction torque.

En outre, le réglage angulaire du coussin se fait avec une suavité non connue dans les réalisations de l'art antérieur, la bague jouant un rôle d'agent lubrifiant. D'autres particularités et avantages de l'invention apparaîtront dans la description qui suit, faite en référence à la figure jointe qui est une vue en perspective partielle éclatée d'un appui tête selon une réalisation. En référence à la figure, on décrit un appui tête 1 de siège de véhicule automobile, ledit appui tête comprenant : - une structure 2 tubulaire métallique de montage au dossier dudit siège, - un coussin d'appui, non représenté, - une plaque 3 d'armature dudit coussin, réalisée notamment à base de matériau plastique moulé, - une pince 4 en tôle métallique repliée en U qui est associée à ladite plaque et emboitée dans sa partie centrale 5 sur ladite structure de manière à l'enserrer, de sorte que ladite plaque soit montée en articulation par rapport à ladite structure, ledit appui tête comprenant en outre une bague 6 de glissement en matière plastique - par exemple en polyamide - disposée entre ladite pince et ladite structure. In addition, the angular adjustment of the cushion is done with a suavity not known in the embodiments of the prior art, the ring acting as a lubricating agent. Other features and advantages of the invention will appear in the description which follows, with reference to the attached figure which is an exploded partial perspective view of a headrest according to one embodiment. Referring to the figure, there is described a headrest 1 of a motor vehicle seat, said headrest comprising: - a tubular metal structure 2 mounting the back of said seat, - a support cushion, not shown, - a plate 3 reinforcing said cushion, made in particular based on molded plastic material, - a clamp 4 metal sheet folded U which is associated with said plate and engaged in its central portion 5 on said structure so as to grip it, so said plate is mounted in articulation relative to said structure, said headrest further comprising a sliding ring 6 of plastic material - for example polyamide - disposed between said clamp and said structure.

Selon la réalisation représentée, la bague 6 est sous la forme d'un manchon pourvu d'une fente 7 axiale. Le montage de la bague 6 se fait par écartement de la fente 7 et insertion de la structure 2 dedans, la pince 4 étant ensuite montée sur ladite bague. According to the embodiment shown, the ring 6 is in the form of a sleeve provided with an axial slot 7. The mounting of the ring 6 is by spacing the slot 7 and insertion of the structure 2 in, the clamp 4 is then mounted on said ring.

Selon une réalisation non représentée, la bague 6 est sous la forme d'une couche de matière plastique surmoulant l'intérieur de la pince 4. Selon une réalisation non représentée, la bague 6 est sous la forme d'une languette souple issue de matière de la plaque 3, ladite languette se recourbant de manière à former un manchon s'interposant entre la structure 2 et la pince 4. Selon la réalisation représentée, la structure 2 est en forme générale de U retourné, la pince 4 étant montée en partie médiane 8 de ladite structure, de manière à disposer d'un appui tête 1 dont le coussin est réglable par rotation pour pouvoir être positionné plus ou moins près de la tête de l'occupant du siège. Selon la réalisation représentée, la pince 4 est associée à la plaque 3 par une vis 9 montée de manière à exercer un effort de rapprochement des branches 10 du U de la pince 4 entre elles permettant l'enserrement de la structure 2. Selon la réalisation représentée, la vis 9 est insérée dans des trous 11 prévus dans chaque branche 10 et dans la plaque 3, un boulon 12 étant vissé sur ladite vis pour assurer le rapprochement attendu entre lesdites branches. Le serrage de la vis 9 est notamment assuré par une clé dynamométrique, ce qui permet d'obtenir un couple de frottement répétable d'un appui tête à l'autre. According to an embodiment not shown, the ring 6 is in the form of a plastic layer overmolding the inside of the clamp 4. According to an embodiment not shown, the ring 6 is in the form of a flexible tongue made of material of the plate 3, said tongue curving so as to form a sleeve interposed between the structure 2 and the clamp 4. According to the embodiment shown, the structure 2 is generally U-shaped returned, the clamp 4 being mounted in part median 8 of said structure, so as to have a headrest 1 whose cushion is adjustable by rotation to be positioned more or less close to the head of the occupant of the seat. According to the embodiment shown, the clamp 4 is associated with the plate 3 by a screw 9 mounted so as to exert a force of approximation of the legs 10 of the U of the clamp 4 between them allowing the clamping of the structure 2. According to the embodiment shown, the screw 9 is inserted into holes 11 provided in each leg 10 and in the plate 3, a bolt 12 being screwed onto said screw to ensure the expected connection between said branches. The tightening of the screw 9 is in particular ensured by a torque wrench, which makes it possible to obtain a repeatable friction torque from one headrest to the other.

Selon une réalisation non représentée, les branches 10 du U de la pince 4 sont pourvues de moyens d'emboitement réciproques, lesdits moyens étant agencés de manière à exercer un effort de rapprochement desdites branches entre elles, permettant l'enserrement de la structure 2, lorsque lesdits moyens sont emboités entre eux. According to an embodiment not shown, the legs 10 of the U of the clamp 4 are provided with reciprocal interlocking means, said means being arranged to exert a force of approaching said branches together, enabling the structure 2 to be clamped together, when said means are nested between them.

Claims

REVENDICATIONS1. Headrest (1) of a motor vehicle seat, said headrest comprising: - a tubular metal structure (2) mounting on the backrest of said seat, - a support cushion, - a plate (3) for reinforcing said cushion, a collet (4) made of U-folded metal sheet which is associated with said plate and fitted in its central part (5) on said structure so as to grip it, so that said plate is hinged to said structure, said headrest being characterized in that it further comprises a plastic slip ring (6) disposed between said clamp and said structure.

2. Head support according to claim 1, characterized in that the ring (6) is in the form of a sleeve provided with an axial slot (7).

3. head support according to claim 1, characterized in that the ring (6) is in the form of a plastic layer overmolding the inside of the clamp (4).

4. head support according to claim 1, characterized in that the ring (6) is in the form of a flexible tongue from the material of the plate (3), said tongue curving so as to form a sleeve interposing between the structure (2) and the clamp (4).

5. Support head according to any one of claims 1 to 4, characterized in that the structure (2) is generally U-shaped returned, the clamp (4) being mounted in the middle portion (8) of said structure.

6. head support according to any one of claims 1 to 5, characterized in that the clamp (4) is associated with the plate (3) by a screw (9) mounted to exert a force of approximation of the branches ( 10) of the U of the clamp (4) between them allowing the clamping of the structure (2).

7. head support according to any one of claims 1 to 5, characterized in that the legs (10) of the U of the clamp (4) are provided with reciprocal engagement means, said means being arranged to exert a effort of bringing said branches together, enabling the structure (2) to be clamped when said means are nested between them.