FR2747080A1 - Passenger crash protection bar for motor vehicle seat - Google Patents

Passenger crash protection bar for motor vehicle seat Download PDF

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Publication number
FR2747080A1
FR2747080A1 FR9604319A FR9604319A FR2747080A1 FR 2747080 A1 FR2747080 A1 FR 2747080A1 FR 9604319 A FR9604319 A FR 9604319A FR 9604319 A FR9604319 A FR 9604319A FR 2747080 A1 FR2747080 A1 FR 2747080A1
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FR
France
Prior art keywords
bar
seat
submarining
motor vehicle
vehicle seat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR9604319A
Other languages
French (fr)
Other versions
FR2747080B1 (en
Inventor
Dominique Bellot
Glaunec Yann Le
Arnaud Mechelaere
Gilbert Walfish
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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Publication date
Application filed by Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Priority to FR9604319A priority Critical patent/FR2747080B1/en
Publication of FR2747080A1 publication Critical patent/FR2747080A1/en
Application granted granted Critical
Publication of FR2747080B1 publication Critical patent/FR2747080B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/18—Anchoring devices
    • B60R22/26—Anchoring devices secured to the seat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/42—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats
    • B60N2/4207—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats characterised by the direction of the g-forces
    • B60N2/4214—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats characterised by the direction of the g-forces longitudinal
    • B60N2/4221—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats characterised by the direction of the g-forces longitudinal due to impact coming from the front
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/42—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats
    • B60N2/427—Seats or parts thereof displaced during a crash
    • B60N2/42727—Seats or parts thereof displaced during a crash involving substantially rigid displacement
    • B60N2/42754—Seats or parts thereof displaced during a crash involving substantially rigid displacement of the cushion
    • B60N2/42763—Seats or parts thereof displaced during a crash involving substantially rigid displacement of the cushion with anti-submarining systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/42—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats
    • B60N2/427—Seats or parts thereof displaced during a crash
    • B60N2/42772—Seats or parts thereof displaced during a crash characterised by the triggering system
    • B60N2/42781—Seats or parts thereof displaced during a crash characterised by the triggering system mechanical triggering

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Seats For Vehicles (AREA)

Abstract

The vehicle seat carries a support (8a, 8b, 11 & 12), which, in the case of shock loading, deploys an anti-submarine bar (7). Two pivot plates (8a & 8b) are arranged along the length of the internal faces of the side panels (3a & 3b) of the seat frame are carried to rotate around the transverse axis (O) between a position of rest, where the bar lies below the surface of the seat and the deployed position, where the bar projects upwards into the seat. The anti-submarine bar is connected by two grooves (15a 15b), in the pivot plates. The grooves serve to limit the forces transmitted by the anti-submarine bar to the occupier of the seat, by using the forces to drive the bar into the deployed position. Movement of the seat belt fixing stalk (13) is transmitted to the pivot plates by the two crank arms (11 & 12).

Description

ASSISE DE SIEGE AUTOMOBILE COMPORTANT UNE BARRE D'ANMISOUMARINAGE DEPLOYABLE
L'invention concerne une assise de siège pour véhicule automobile. En cas de choc d'un véhicule, il est connu que le corps d'un occupant sanglé sur son siège se déplace relativement à la ceinture, en particulier par un glissement de son bassin le long de l'assise, sous la partie ventrale de ladite ceinture. Ce déplacement augmente les risques de lésions consécutives à une compression exagérée des segments corporels.AUTOMOTIVE SEAT SEAT HAVING A DEPLOYABLE ANMISOUMARINAGE BAR
The invention relates to a seat cushion for a motor vehicle. In the event of a vehicle impact, it is known that the body of an occupant strapped to his seat moves relatively to the belt, in particular by a sliding of his pelvis along the seat, under the ventral part of said belt. This displacement increases the risk of injuries following excessive compression of the body segments.

Pour remédier à cet inconvénient, il a été proposé de modifier la structure de l'armature de l'assise par adjonction d'une traverse située à proximité de la partie antérieure de ladite armature, traverse appelée ci-après barre d'antisoumarinage. Par sa forme élaborée, la barre d'antisoumarinage limite les déplacements exagérés vers l'avant, du bassin de l'occupant du siège et, par voie de conséquence, préserve ledit occupant des lésions abdominales. Cependant, la proéminence créée par la barre d'antisoumarinage à la surface du siège nuit au confort de l'utilisateur et ne permet pas un positionnement optimal de ladite barre. C'est pour remédier à cet inconvénient qu'il a été proposé des systèmes de déploiement de la barre d'antisoumarinage actionnés par exemple par le déclencheur pyrotechnique du prétensionneur de ceinture. Un exemple d'un tel système est décrit dans la publication DE3631881. Néanmoins, de tels systèmes ne permettent pas de contrôler efficacement la pression résultant, au niveau des fesses de l'occupant, lorsque le bassin de ce dernier vient s'écraser, en cas de choc violent, sur la barre d'antisoumarinage, ce qui peut provoquer des lésions.To remedy this drawback, it has been proposed to modify the structure of the frame of the seat by adding a cross member located near the front part of said frame, a cross member called hereinafter anti-submarining bar. By its elaborate shape, the anti-submarining bar limits exaggerated forward movements of the pelvis of the seat occupant and, consequently, preserves said occupant from abdominal lesions. However, the prominence created by the anti-submarining bar on the surface of the seat harms the comfort of the user and does not allow optimal positioning of said bar. It is to remedy this drawback that systems for deploying the anti-submarining bar have been proposed, actuated for example by the pyrotechnic trigger of the belt pretensioner. An example of such a system is described in the publication DE3631881. However, such systems do not make it possible to effectively control the pressure resulting, at the level of the occupants' buttocks, when the pelvis of the latter is crushed, in the event of a violent impact, on the anti-submarining bar, which may cause injury.

L'assise du siège selon l'invention vise à remédier à ces inconvénients. A cet effet, l'invention concerne une assise de siège de véhicule automobile du type comportant des moyens de déploiement, en cas de choc, d'une barre d'antisoumarinage, entre une position de repos et une position déployée, L'assise étant caractérisée en ce que ladite barre d'antisoumarinage est fixée audits moyens de déploiement par l'intermédiaire de moyens de limitation des efforts transmis par la barre d'antisoumarinage à l'occupant du siège, lesdits moyens de limitation des efforts procurant à la barre d'antisoumarinage en position déployée, au delà d'une valeur déterminée des efforts, un mouvement d'effacement suivant une trajectoire déterminée par des moyens de guidage.The seat of the seat according to the invention aims to remedy these drawbacks. To this end, the invention relates to a seat of a motor vehicle seat of the type comprising means for deploying, in the event of an impact, an anti-submarining bar, between a rest position and a deployed position, the seat being characterized in that said anti-submarining bar is fixed to said deployment means by means of force limitation transmitted by the anti-submarining bar to the occupant of the seat, said force limiting means providing the bar anti-submarining in the deployed position, beyond a determined value of the forces, an erasing movement along a trajectory determined by guide means.

Selon une autre caractéristique de l'invention, les moyens de déploiement de la barre d'antisoumarinage sont constitués par - deux biellettes disposées le long des faces intérieures de flasques
verticaux formant l'assise, les deux biellettes étant reliées entre elles par
ladite barre d'antisoumarinage et montées à rotation, autour d'un même
axe horizontal, entre la position de repos dans laquelle ladite barre
d'antisoumarinage n'émerge pas de la surface de l'assise et la position
déployée dans laquelle la barre d'antisoumarinage fait saillie à la
surface de l'assise, - des moyens de transmission de mouvement transformant un mouvement
de translation de la tige du pédoncule de la ceinture de sécurité en un
mouvement de rotation des biellettes autour de leur axe de rotation.According to another characteristic of the invention, the means for deploying the anti-submarining bar consist of - two rods arranged along the inner faces of the flanges
vertical forming the seat, the two links being interconnected by
said anti-submarining bar and rotatably mounted, around the same
horizontal axis, between the rest position in which said bar
anti-submarining does not emerge from the seat surface and position
deployed in which the anti-submarining bar projects to the
seat surface, - movement transmission means transforming a movement
for translating the seatbelt stem into one
rotational movement of the rods about their axis of rotation.

Selon une autre caractéristique de l'invention, les moyens de guidage sont constitués par des rainures secondaires pratiquées respectivement dans l'épaisseur de chacune des biellettes de manière à être inclinées vers le haut et vers l'avant en position de repos de la barre d'antisoumarinage et inclinées vers le bas et vers l'avant en position déployée de ladite barre d'antisoumarinage.According to another characteristic of the invention, the guide means consist of secondary grooves made respectively in the thickness of each of the rods so as to be inclined upwards and forwards in the rest position of the bar d 'anti-submarining and tilted down and forward in the deployed position of said anti-submarining bar.

Selon une autre caractéristique de l'invention, les moyens de limitation des efforts sont constitués par les rainures secondaires pratiquées dans l'épaisseur des biellettes correspondantes, la largeur desdites rainures secondaires étant inférieure à l'épaisseur des extrémités de la barre d'antisoumarinage, lesdites extrémités étant montées à force dans les mêmes rainures.According to another characteristic of the invention, the means for limiting the forces consist of the secondary grooves made in the thickness of the corresponding rods, the width of said secondary grooves being less than the thickness of the ends of the anti-submarining bar, said ends being force fitted in the same grooves.

Selon une autre caractéristique de l'invention, la largeur des rainures secondaires est variable le long desdites rainures.According to another characteristic of the invention, the width of the secondary grooves is variable along said grooves.

Selon une autre caractéristique de l'invention, les biellettes sont reliées par une barre de liaison disposée à l'opposé de la barre d'antisoumarinage par rapport à l'axe de rotation. According to another characteristic of the invention, the links are connected by a connecting bar arranged opposite the anti-submarining bar with respect to the axis of rotation.

Selon une autre caractéristique de l'invention, les biellettes sont guidées chacune par un téton émergeant de la face interne de chaque flasque pour coulisser respectivement à l'intérieur d'une rainure primaire pratiquée, en forme d'arc de cercle centré sur l'axe de rotation dans l'épaisseur de chaque biellette, lesdites rainures primaires limitant ainsi la rotation des biellettes et par suite de la barre d'antisoumarinage entre la position de repos et la position déployée.According to another characteristic of the invention, the rods are each guided by a stud emerging from the internal face of each flange to slide respectively inside a primary groove formed, in the form of an arc of a circle centered on the axis of rotation in the thickness of each link, said primary grooves thus limiting the rotation of the links and consequently of the anti-submarining bar between the rest position and the deployed position.

Selon une autre caractéristique de l'invention, les moyens de transmission de mouvement sont constitués par - une came disposée sur la face externe d'un des flasques, ladite came
étant fixée rigidement aux biellettes au niveau de l'axe de rotation
desdites biellettes, - un culbuteur monté à rotation sur ladite face externe de manière à
coopérer à une de ses extrémités avec ladite came et relié par son autre
extrémité à la tige du pédoncule de la ceinture de sécurité.According to another characteristic of the invention, the movement transmission means consist of - a cam arranged on the external face of one of the flanges, said cam
being rigidly attached to the rods at the axis of rotation
said rods, - a rocker arm rotatably mounted on said external face so as to
cooperate at one of its ends with said cam and connected by its other
end to the stem of the seatbelt stalk.

L'assise de siège selon l'invention permet, après le déploiement de la barre d'antisoumarinage, de contrôler la trajectoire de ladite barre et surtout l'effort qu'elle transmet à l'occupant du siège tout au long du choc. On peut ainsi choisir a priori l'effort maximal que subira l'occupant et donc, en particulier, le maintenir en deçà des limites physiologiques acceptables.The seat cushion according to the invention makes it possible, after the deployment of the anti-submarining bar, to control the trajectory of said bar and especially the force which it transmits to the occupant of the seat throughout the impact. We can thus choose a priori the maximum effort that the occupant will undergo and therefore, in particular, keep it below acceptable physiological limits.

On peut également faire varier cet effort maximal d'un type de véhicule à l'autre au prix d'une adaptation très simple. Ceci permettra, par exemple, de diminuer l'effort maximal subit dans le cas d'une utilisation de l'assise selon l'invention à l'intérieur d'un véhicule dont la caisse possède de bonnes propriétés d'absorption de l'énergie.We can also vary this maximum effort from one type of vehicle to another at the cost of a very simple adaptation. This will, for example, reduce the maximum effort undergone in the case of using the seat according to the invention inside a vehicle whose body has good energy absorption properties .

D'autres caracfgristiques et avantages apparaîtront à la lecture de la description d'un exemple de dispositif selon l'invention, en référence aux dessins dans lesquels - la figure 1 est une vue en perspective de la structure d'un siège muni
d'une assise selon l'invention, la barre d'antisoumarinage étant en
position de repos, - la figure 2 est une vue du siège de la figure 1 après déploiement de la
barre d'antisoumarinage, - la figure 3 est une vue du siège de la figure 2 avec la barre
d 'antisoumarinage en cours d'effacement, - la figure 4 est une vue en coupe verticale de l'assise selon l'invention
sur laquelle la position de repos de la barre d'antisoumarinage est
représentée en trait plein et la position après déploiement et en cours
d'effacement, en trait interrompu, - la figure 5 est une vue schématique représentant l'occupant assis dans le
siège muni de l'assise selon l'invention, avant le choc, - la figure 6 est une vue de l'occupant et du siège selon la figure 4 après
le choc, la barre d'antisoumarinage étant déployée et en cours
d'effacement.Other characteristics and advantages will appear on reading the description of an example of a device according to the invention, with reference to the drawings in which - Figure 1 is a perspective view of the structure of a seat provided
of a seat according to the invention, the anti-submarining bar being in
rest position, - Figure 2 is a view of the seat of Figure 1 after deployment of the
anti-submarining bar, - Figure 3 is a view of the seat of Figure 2 with the bar
antisoumarinage being erased, - Figure 4 is a vertical sectional view of the seat according to the invention
in which the rest position of the anti-submarining bar is
shown in solid lines and position after deployment and in progress
deletion, in broken lines, - Figure 5 is a schematic view showing the occupant seated in the
seat provided with the seat according to the invention, before the impact, - Figure 6 is a view of the occupant and the seat according to Figure 4 after
the shock, the anti-submarining bar being deployed and in progress
of erasure.

L'assise 1 selon l'invention est représentée dans sa position de repos sur la figure 1 où elle est munie d'un dossier 2. L'assise 1 est constituée de deux flasques verticaux 3a,3b montés respectivement sur des glissières 4a,4b elles-mêmes fixées sur le plancher d'un véhicule. Les deux flasques verticaux 3a,3b sont reliés entre eux par une traverse antérieure 5 disposée à l'avant et en bas de l'assise 1 et par une traverse postérieure 6 disposée à l'arrière de ladite assise 1. Une barre d'antisoumarinage 7 est disposée transversalement à l'assise 1, fixée respectivement à chacune de ses extrémités, à des biellettes 8a,8b elles-mêmes articulées le long des faces intérieures des flasques verticaux 3a,3b. Les deux biellettes 8a,8b sont parallèles et solidaires entre elles, montées à rotation selon un même axe horizontal virtuel O. Une barre de liaison 8c vient relier les biellettes 8a,8b-'entre elles, du côté de l'axe O opposé à la barre d'antisoumarinage 7 de manière à rigidifier l'ensemble. Les biellettes 8a,8b comportent respectivement une rainure primaire 9a,9b en forme d'arc de cercle centré sur l'axe de rotation O desdites biellettes 8a,8b. Un téton l0a,l0b émerge de la face interne de chaque flasque 3a,3b pour coulisser à l'intérieur de sa rainure primaire 9a,9b respective limitant ainsi la rotation des biellettes 8a,8b et par suite de la barre d'antisoumarinage 7 entre une première position de repos représentée sur la figure I dans laquelle ladite barre 7 n'émerge pas de la surface de l'assise 1, et une position déployée représentée sur la figure 2 dans laquelle la barre d'antisoumarinage 7 fait saillie à la surface de l'assise 1 de manière à s'opposer au glissement de l'occupant en cas de choc. Un exemple de moyen de déploiement est représenté sur les figures.The seat 1 according to the invention is shown in its rest position in Figure 1 where it is provided with a backrest 2. The seat 1 consists of two vertical flanges 3a, 3b mounted respectively on slides 4a, 4b themselves fixed to the floor of a vehicle. The two vertical flanges 3a, 3b are interconnected by an anterior crossmember 5 arranged at the front and at the bottom of the seat 1 and by a rear crossmember 6 arranged at the rear of said seat 1. An anti-submarining bar 7 is arranged transversely to the seat 1, fixed respectively at each of its ends, to rods 8a, 8b themselves articulated along the inner faces of the vertical flanges 3a, 3b. The two links 8a, 8b are parallel and integral with each other, mounted for rotation about the same virtual horizontal axis O. A connecting bar 8c connects the links 8a, 8b-'together, on the side of the axis O opposite to the anti-submarining bar 7 so as to stiffen the assembly. The links 8a, 8b respectively have a primary groove 9a, 9b in the form of an arc of a circle centered on the axis of rotation O of said links 8a, 8b. A stud l0a, l0b emerges from the internal face of each flange 3a, 3b to slide inside its primary groove 9a, 9b respectively thus limiting the rotation of the rods 8a, 8b and consequently of the anti-submarining bar 7 between a first rest position shown in Figure I in which said bar 7 does not emerge from the surface of the seat 1, and a deployed position shown in Figure 2 in which the anti-submarining bar 7 protrudes from the surface of the seat 1 so as to oppose the sliding of the occupant in the event of an impact. An example of deployment means is shown in the figures.

Il est constitué par une came il disposée sur la face externe du flasque 3b, ladite came 11 étant fixée rigidement à la biellette 8b au niveau de l'axe de rotation O des biellettes 8a,8b. Cette came 11 coopère avec une des extrémités 12a d'un culbuteur 12 monté à rotation sur la face externe du flasque 3b et relié par son autre extrémité 12b à la tige 13 du pédoncule 14 de la ceinture de sécurité. En cas de choc, un prétensionneur non représenté sur les figures, par exemple du type à déclenchement pyrotechnique, vient tendre la ceinture de sécurité en provoquant une rétraction de la tige 13. Ceci entraîne un basculement du culbuteur 12 et par suite une rotation de la came 11. Cette rotation se traduit par une rotation identique de la biellette 8b et par suite de l'ensemble rigide constitué des biellettes 8a,8b et des barres 7,8c on obtient donc un déploiement de la barre d'antisoumarinage 7 dans la position représentée sur la figure 2. Le déploiement est suffisamment rapide pour intervenir avant que le corps de l'occupant n'ait pu se déplacer notablement sous l'effet du choc. Ceci permet d'obtenir une efficacité maximale de la retenue procurée par la barre d'antisoumarinage 7.It consists of a cam 11 disposed on the external face of the flange 3b, said cam 11 being rigidly fixed to the link 8b at the level of the axis of rotation O of the links 8a, 8b. This cam 11 cooperates with one of the ends 12a of a rocker arm 12 rotatably mounted on the external face of the flange 3b and connected by its other end 12b to the rod 13 of the peduncle 14 of the seat belt. In the event of an impact, a pretensioner not shown in the figures, for example of the pyrotechnic trigger type, comes to tighten the seat belt by causing the rod 13 to retract. This causes the rocker arm 12 to topple and consequently rotate the cam 11. This rotation results in an identical rotation of the rod 8b and as a result of the rigid assembly consisting of the rods 8a, 8b and bars 7,8c there is therefore obtained a deployment of the anti-submarining bar 7 in the position shown in Figure 2. The deployment is fast enough to intervene before the body of the occupant could not move significantly under the effect of shock. This makes it possible to obtain maximum efficiency from the retention provided by the anti-submarining bar 7.

La barre d'antisoumarinage 7 est montée sur chacune des biellettes 8a,8b par l'intermédiaire d'un dispositif permettant d'obtenir un effacement de ladite barre d'antisoumarinage 7 sous un effort donné. Selon une variante particulière de l'invention, la barre d'antisoumarinage 7 est montée avec chacune de ses extrémités emboîtée respectivement au fond d'une rainure secondaire 15a,15b longitudinale. Ces rainures secondaires 15a,15b sont disposées respectivement sur chacune des biellettes 8a,8b de manière à être inclinées vers le haut et vers l'avant en position de repos de la barre d'antisoumarinage 7 et inclinées vers le bas et vers l'avant en position de déploiement de ladite barre d'antisoumarinage 7. Le mouvement d'effacement vers le bas et vers l'avant de la barre d'antisoumarinage 7 intervient après que ladite barre d'antisoumarinage 7 ait atteint sa position déployée. Il est obtenu par un glissement de la barre 7 dans les rainures secondaires 15a,15b, glissement limité par des moyens de dissipation d'énergie bien connus de l'homme du métier et qui seront déterminés de manière à limiter l'effort exercé par ladite barre 7 sur l'occupant du siège à des valeurs comprises dans une fourchette allant de 300 à 900 daN. De tels moyens pourront constituer par exemple en des vérins disposés le long des rainures secondaires 15a, 15b, vérins reliant la barre d'antisoumarinage 7 aux biellettes 8a,8. Selon une variante particulièrement avantageuse représentée sur les figures, la dissipation de l'énergie est assurée par les rainures secondaires 15a,15b dont la largeur est inférieure à l'épaisseur des parties de la barre d'antisoumarinage 7 emboîtées dans lesdites rainures 15a,15b. Le fonctionnement en cas de choc est celui illustré sur les figures 3,4,5 et 6. La figure 5 représente l'occupant assis dans le siège, les fesses situées à la limite entre l'assise 1 et le dossier 2, la barre d'antisoumarinage 7 rentrée en position de repos sous le niveau supérieur de l'assise 1. Lors du choc, le prétensionneur provoque une rétraction de la tige 13 qui entraîne un basculement du culbuteur 12 et par suite une rotation de la came 11. Cette rotation se traduit par une rotation identique de la biellette 8b et donc par un déploiement de la barre d'antisoumarinage 7 vers le haut et vers l'avant dans la position représentée sur la figure 2. La barre d'antisoumarinage 7 est encore, à cet instant, rattachée aux biellettes 8a,8b par ses extrémités emboîtées en fond arrière des rainures secondaires 15a,15b, c'est à dire dans sa position la plus élevée possible. L'occupant du siège est entraîné vers l'avant par son inertie et vient appuyer avec ses fesses sur la barre d'antisoumarinage 7, comme il est représenté sur la figure 6. La largeur des rainures secondaires 15a, 15b et l'épaisseur de la barre d'antisoumarinage 7 sont déterminées de manière à ce que, pour un effort donné, compris-généralement entre 300 et 900 daN, les lèvres desdites rainures secondaires 15a,15b s'écartent, déformées par les extrémités de la barre d'antisoumarinage 7 entraînée vers l'avant, comme il est représenté en traits pleins sur les figures 3 et 6 et en traits interrompus sur la figure 4. Le guidage assuré par les rainures secondaires 15a,15b entraîne une trajectoire de la barre d'antisoumarinage 7 vers le bas et vers l'avant représentée sur les figures 3 et 4. Ceci se traduit chez l'occupant du siège par une plongée du bassin vers l'avant et vers le bas comme le montre la figure 6. De la même manière qu'il est possible de programmer l'effort maximal admissible, comme on l'a déjà vu ci-dessus, il est également possible de programmer un effort de retenue variable exercé par la barre d'antisoumarinage, par exemple, en faisant varier la largeur des rainures secondaires 15a, 15b de l'avant vers l'arrière de l'assise 1.The anti-submarining bar 7 is mounted on each of the links 8a, 8b by means of a device making it possible to obtain an erasure of said anti-submarining bar 7 under a given force. According to a particular variant of the invention, the anti-submarining bar 7 is mounted with each of its ends fitted respectively at the bottom of a secondary groove 15a, 15b longitudinal. These secondary grooves 15a, 15b are disposed respectively on each of the links 8a, 8b so as to be inclined upwards and forwards in the rest position of the anti-submarining bar 7 and inclined downwards and forwards in the deployment position of said anti-submarining bar 7. The erasing movement down and forward of the anti-submarining bar 7 occurs after said anti-submarining bar 7 has reached its deployed position. It is obtained by a sliding of the bar 7 in the secondary grooves 15a, 15b, sliding limited by means of energy dissipation well known to those skilled in the art and which will be determined so as to limit the force exerted by said bar 7 on the seat occupant at values ranging from 300 to 900 daN. Such means could constitute, for example, cylinders arranged along the secondary grooves 15a, 15b, cylinders connecting the anti-submarining bar 7 to the links 8a, 8. According to a particularly advantageous variant shown in the figures, the dissipation of energy is ensured by the secondary grooves 15a, 15b whose width is less than the thickness of the parts of the anti-submarining bar 7 fitted into said grooves 15a, 15b . The operation in the event of an impact is that illustrated in FIGS. 3,4,5 and 6. FIG. 5 represents the occupant seated in the seat, the buttocks located at the limit between the seat 1 and the backrest 2, the bar anti-submarining device 7 returned to the rest position under the upper level of the seat 1. During the impact, the pretensioner causes retraction of the rod 13 which causes the rocker arm 12 to tilt and consequently the cam 11 to rotate. rotation results in an identical rotation of the link 8b and therefore in a deployment of the anti-submarining bar 7 upwards and forwards in the position shown in FIG. 2. The anti-submarining bar 7 is still, at this instant, attached to the links 8a, 8b by its ends fitted into the rear bottom of the secondary grooves 15a, 15b, that is to say in its highest possible position. The occupant of the seat is driven forward by its inertia and presses with its buttocks on the anti-submarining bar 7, as shown in FIG. 6. The width of the secondary grooves 15a, 15b and the thickness of the anti-submarining bar 7 are determined so that, for a given force, generally between 300 and 900 daN, the lips of said secondary grooves 15a, 15b move apart, deformed by the ends of the anti-submarining bar 7 driven forward, as shown in solid lines in Figures 3 and 6 and in broken lines in Figure 4. The guidance provided by the secondary grooves 15a, 15b causes a trajectory of the anti-submarining bar 7 towards down and forward shown in Figures 3 and 4. This results in the seat occupant by diving the pelvis forward and down as shown in Figure 6. In the same way as it is possible to program the maximum admissible force, as already seen above, it is also possible to program a variable retaining force exerted by the anti-submarining bar, for example, by varying the width of the secondary grooves 15a, 15b from front to back of seat 1.

Bien entendu, l'invention n'est nullement limitée au mode de réalisation décrit et illustré qui n'a été donné qu'à titre d'exemple. En particulier, une assise dans laquelle la barre d'antisoumarinage serait fixée sur ses moyens de déploiement par l'intermédiaire de moyens de limitation des efforts autres que des rainures, ne sortirait pas du cadre de l'invention. Of course, the invention is in no way limited to the embodiment described and illustrated, which has been given only by way of example. In particular, a seat in which the anti-submarining bar would be fixed to its deployment means by means of means for limiting forces other than grooves, would not depart from the scope of the invention.

Claims (8)

REVENDICATIONS 1) Assise (1) de siège de véhicule automobile du type comportant des1) Seat (1) of a motor vehicle seat of the type comprising moyens de déploiement (8a,8b,11,12), en cas de choc, d'une barre deployment means (8a, 8b, 11,12), in the event of an impact, of a bar d'antisoumarinage (7), entre une position de repos et une position anti-submarining system (7), between a rest position and a position déployée, caractérisée en ce que ladite barre d'antisoumarinage (7) est deployed, characterized in that said anti-submarining bar (7) is fixée audits moyens de déploiement (8a,8b,11,12) par l'intermédiaire fixed audits means of deployment (8a, 8b, 11,12) through de moyens(l5a,l5b) de limitation des efforts transmis par la barre means (15a, 15b) for limiting the forces transmitted by the bar d'antisoumarinage (7) à l'occupant du siège, lesdits moyens (t5a, t5b)  anti-submarining (7) to the occupant of the seat, said means (t5a, t5b) de limitation des efforts procurant à la barre d'antisoumarinage (7) en limiting efforts providing the anti-submarining bar (7) in position déployée, au-delà d'une valeur déterminée des efforts, un deployed position, beyond a determined force value, a mouvement d'effacement suivant une trajectoire déterminée par des erasure movement along a trajectory determined by moyens de guidage (15a, 15b). guide means (15a, 15b). 2) Assise (t) de siège de véhicule automobile selon la revendication 1,2) Seat (t) of a motor vehicle seat according to claim 1, caractérisée en ce que les moyens de déploiement de la barre characterized in that the means for deploying the bar d'antisoumarinage (7) sont constitués par  antisoumarinage (7) consist of - deux biellettes (8a,8b) disposées le long des faces intérieures de - two rods (8a, 8b) arranged along the inner faces of flasques verticaux (3a,3b) formant l'assise (1), les deux vertical flanges (3a, 3b) forming the seat (1), both biellettes (8a,8b) étant reliées entre elles par ladite barre connecting rods (8a, 8b) being interconnected by said bar d'antisoumarinage (7) et montées à rotation, autour d'un même axe anti-submarining system (7) and rotatably mounted, around the same axis horizontal (O), entre la position de repos dans laquelle ladite barre horizontal (O), between the rest position in which said bar d'antisoumarinage (7) n'émerge pas de la surface de l'assise (1) et la anti-submarining (7) does not emerge from the surface of the seat (1) and the position déployée dans laquelle la barre d'antisoumarinage (7) fait deployed position in which the anti-submarining bar (7) saillie à la surface de l'assise (1)  projection on the surface of the seat (1) - des moyens de transmission (11,12) de mouvement transformant un - motion transmission means (11,12) transforming a mouvement de translation de la tige (13) du pédoncule (14) de la translational movement of the rod (13) of the peduncle (14) of the ceinture ae sécurité en un mouvement de rotation des seat belt in a rotational movement of the biellettes (8a,8b) autour de leur axe de rotation (O). rods (8a, 8b) around their axis of rotation (O). 3) Assise (1) de siège de véhicule automobile selon la revendication 2,3) Seat (1) of a motor vehicle seat according to claim 2, caractérisée en ce que les moyens de guidage sont constitués par des characterized in that the guide means consist of rainures secondaires( 15a, 15b) pratiquées respectivement dans secondary grooves (15a, 15b) made respectively in l'épaisseur de chacune des biellettes (8a,8b) de manière à être inclinées  the thickness of each of the links (8a, 8b) so as to be inclined vers le haut et vers l'avant en position de repos de la barre up and forward in the bar rest position d'antisoumarinage (7) et inclinées vers le bas et vers l'avant en position anti-submarining (7) and tilted down and forward in position déployée de ladite barre d'antisoumarinage (7). deployed from said anti-submarining bar (7). 4) Assise (1) de siège de véhicule automobile selon la revendication 3,4) Seat (1) of a motor vehicle seat according to claim 3, caractérisée en ce que les moyens de limitation des efforts sont characterized in that the means for limiting the forces are constitués par les rainures secondaires (15a,15b) pratiquées dans formed by the secondary grooves (15a, 15b) made in l'épaisseur des biellettes (Sa, 8b) correspondantes, la largeur desdites the thickness of the corresponding rods (Sa, 8b), the width of said rainures secondaires (ISa, 15b) étant inférieure à l'épaisseur des secondary grooves (ISa, 15b) being less than the thickness of the extrémités de la barre d'antisoumarinage (7), lesdites extrémités étant ends of the anti-submarining bar (7), said ends being montées à force dans les mêmes rainures (iSa, t5b).  force-fitted in the same grooves (iSa, t5b). 5) Assise (1) de siège de véhicule automobile selon la revendication 4,5) Seat (1) of a motor vehicle seat according to claim 4, caractérisée en ce que la largeur des rainures secondaires (t5a, t5b) est characterized in that the width of the secondary grooves (t5a, t5b) is variable le long desdites rainures (t5a, 15b).  variable along said grooves (t5a, 15b). 6) Assise (1) de siège de véhicule automobile selon l'une quelconque des6) Seat (1) of a motor vehicle seat according to any one of revendications 2 à 5, caractérisée en ce que les biellettes (8a,8b) sont Claims 2 to 5, characterized in that the links (8a, 8b) are reliées par une barre de liaison (8c) disposée à l'opposé de la barre connected by a connecting bar (8c) arranged opposite the bar d'antisoumarinage (7) par rapport à l'axe (O). anti-submarining (7) with respect to the axis (O). 7) Assise (1) de siège de véhicule automobile selon l'une quelconque des7) Seat (1) of a motor vehicle seat according to any one of revendications 2 à 6, caractérisée en ce que les biellettes (8a,8b) sont Claims 2 to 6, characterized in that the links (8a, 8b) are guidées chacune par un téton (10a, lOb) émergeant de la face interne de each guided by a stud (10a, lOb) emerging from the internal face of chaque flasque (3a,3b) pour coulisser respectivement à l'intérieur d'une each flange (3a, 3b) for sliding respectively inside a rainure primaire (9a,9b) pratiquée, en forme d'arc de cercle centré sur primary groove (9a, 9b) formed, in the form of an arc of a circle centered on l'axe de rotation (O), dans l'épaisseur de chaque biellette (8a,8b), the axis of rotation (O), in the thickness of each link (8a, 8b), lesdites rainures primaires (9a,9b) limitant ainsi la rotation des said primary grooves (9a, 9b) thus limiting the rotation of the biellettes (8a,8b) et par suite de la barre d'antisoumarinage (7) entre la rods (8a, 8b) and as a result of the anti-submarining bar (7) between the position de repos et la position déployée. rest position and the deployed position. 8) Assise (1) de siège de véhicule automobile selon l'une quelconque des8) Seat (1) of a motor vehicle seat according to any one of revendications 2 à 7, caractérisée en ce que les moyens de transmission claims 2 to 7, characterized in that the transmission means de mouvement sont constitués par: - une came (11) disposée sur la face externe d'un des flasques (3b), movement consist of: - a cam (11) arranged on the external face of one of the flanges (3b), ladite came (11) étant fixée rigidement aux biellettes (8a,8b) au said cam (11) being rigidly fixed to the rods (8a, 8b) at niveau de l'axe de rotation (O) desdites biellettes (8a,8b), - un culbuteur (12) monté à rotation sur ladite face externe de manière level of the axis of rotation (O) of said links (8a, 8b), - a rocker arm (12) rotatably mounted on said external face so à coopérer à une de ses extrémités (12a) avec ladite came (11) et to cooperate at one of its ends (12a) with said cam (11) and relié par son autre extrémité (12b) à la tige (13) du pédoncule (14) connected by its other end (12b) to the rod (13) of the peduncle (14) de la ceinture de sécurité.  seat belt.
FR9604319A 1996-04-05 1996-04-05 AUTOMOTIVE SEAT SEAT COMPRISING A DEPLOYABLE ANTISOUMARINE BAR Expired - Fee Related FR2747080B1 (en)

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FR2772690A1 (en) 1997-12-24 1999-06-25 Faure Bertrand Equipements Sa SEAT OF A MOTOR VEHICLE SEAT COMPRISING AN ANTI-SUBMARINE CROSSING
FR2772689A1 (en) * 1997-12-21 1999-06-25 Renault Anti-submarining arrangement for vehicle seat
FR2789026A1 (en) 1999-01-28 2000-08-04 Faure Bertrand Equipements Sa VEHICLE SEAT HAVING A MOBILE SAFETY CROSSING
WO2001019641A1 (en) * 1999-09-16 2001-03-22 Faurecia Sieges D'automobile S.A. Motor vehicle seat part comprising an anti-submarining crosspiece
FR2832106A1 (en) 2001-11-12 2003-05-16 Faurecia Sieges Automobile Automobile seat comprises anti-submarining crosspiece, pivoted on transverse axis on sliding carriage, which is pivoted relative to carriage rearward into deployment position by pyrotechnic actuator
US6604599B2 (en) * 1999-03-15 2003-08-12 Nhk Spring Co., Ltd. Anti-submarine vehicle occupant restraint system
WO2005047054A1 (en) * 2003-11-07 2005-05-26 Johnson Controls Gmbh Vehicle seat comprising an adjustable safety means for preventing especially an accident-related excessive forward displacement of the pelvis
DE10354171A1 (en) * 2003-11-07 2005-06-16 Johnson Controls Gmbh Vehicle seat with an adjustable safety means to avoid in particular accidental excessive Beckenvorverlagerung
ES2340648A1 (en) * 2008-05-06 2010-06-07 Viza Automocion S.A.U Seat for automobiles (Machine-translation by Google Translate, not legally binding)
FR3081794A1 (en) * 2018-06-04 2019-12-06 Psa Automobiles Sa VEHICLE SEAT WITH ACTIVE CUSHION NOSE
CN110861550A (en) * 2018-08-27 2020-03-06 丰田自动车株式会社 Vehicle seat
US11072265B2 (en) * 2019-09-18 2021-07-27 Lear Corporation Vehicle seat assembly with front seat pan height adjustment mechanism
US11772518B2 (en) 2016-11-11 2023-10-03 Brose Fahrzeugteile Gmbh & Co. Vehicle seat with blocking device for a lowerable seat part of the vehicle seat

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Cited By (21)

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FR2772689A1 (en) * 1997-12-21 1999-06-25 Renault Anti-submarining arrangement for vehicle seat
WO1999035000A1 (en) * 1997-12-21 1999-07-15 Renault Antisubmarining device capable of being unfolded from an inoperative to an operative position
FR2772690A1 (en) 1997-12-24 1999-06-25 Faure Bertrand Equipements Sa SEAT OF A MOTOR VEHICLE SEAT COMPRISING AN ANTI-SUBMARINE CROSSING
US6050635A (en) * 1997-12-24 2000-04-18 Bertrand Faure Equipements S.A. Seat pan of an automobile vehicle seat including an anti-sub-marining device
FR2789026A1 (en) 1999-01-28 2000-08-04 Faure Bertrand Equipements Sa VEHICLE SEAT HAVING A MOBILE SAFETY CROSSING
US6254181B1 (en) 1999-01-28 2001-07-03 Bertrand Faure Equipements Sa Vehicle seat having a movable safety bar
DE10003853B4 (en) * 1999-01-28 2004-08-26 Bertrand Faure Equipements S.A. Vehicle seat with a movable safety crossbar
US6604599B2 (en) * 1999-03-15 2003-08-12 Nhk Spring Co., Ltd. Anti-submarine vehicle occupant restraint system
WO2001019641A1 (en) * 1999-09-16 2001-03-22 Faurecia Sieges D'automobile S.A. Motor vehicle seat part comprising an anti-submarining crosspiece
FR2798629A1 (en) * 1999-09-16 2001-03-23 Faure Bertrand Equipements Sa SEAT OF A MOTOR VEHICLE SEAT COMPRISING AN ANTI-SUBMARINE CROSSING
US6746077B2 (en) 2001-11-12 2004-06-08 Faurecia Sieges D'automobile S.A. Seat pan of an automobile vehicle seat including an anti-submarining crossmember
FR2832106A1 (en) 2001-11-12 2003-05-16 Faurecia Sieges Automobile Automobile seat comprises anti-submarining crosspiece, pivoted on transverse axis on sliding carriage, which is pivoted relative to carriage rearward into deployment position by pyrotechnic actuator
DE10251258B4 (en) * 2001-11-12 2005-06-09 Faurecia Sièges d'Automobile S.A. Seat of a motor vehicle seat with a cross strut against slipping through
WO2005047054A1 (en) * 2003-11-07 2005-05-26 Johnson Controls Gmbh Vehicle seat comprising an adjustable safety means for preventing especially an accident-related excessive forward displacement of the pelvis
DE10354171A1 (en) * 2003-11-07 2005-06-16 Johnson Controls Gmbh Vehicle seat with an adjustable safety means to avoid in particular accidental excessive Beckenvorverlagerung
ES2340648A1 (en) * 2008-05-06 2010-06-07 Viza Automocion S.A.U Seat for automobiles (Machine-translation by Google Translate, not legally binding)
US11772518B2 (en) 2016-11-11 2023-10-03 Brose Fahrzeugteile Gmbh & Co. Vehicle seat with blocking device for a lowerable seat part of the vehicle seat
FR3081794A1 (en) * 2018-06-04 2019-12-06 Psa Automobiles Sa VEHICLE SEAT WITH ACTIVE CUSHION NOSE
CN110861550A (en) * 2018-08-27 2020-03-06 丰田自动车株式会社 Vehicle seat
CN110861550B (en) * 2018-08-27 2022-05-27 丰田自动车株式会社 Vehicle seat
US11072265B2 (en) * 2019-09-18 2021-07-27 Lear Corporation Vehicle seat assembly with front seat pan height adjustment mechanism

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