EP0391759A1 - Device for adjusting the tension of supporting springs for a seat cushion - Google Patents

Device for adjusting the tension of supporting springs for a seat cushion Download PDF

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Publication number
EP0391759A1
EP0391759A1 EP90400752A EP90400752A EP0391759A1 EP 0391759 A1 EP0391759 A1 EP 0391759A1 EP 90400752 A EP90400752 A EP 90400752A EP 90400752 A EP90400752 A EP 90400752A EP 0391759 A1 EP0391759 A1 EP 0391759A1
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EP
European Patent Office
Prior art keywords
tension
shape memory
heating
spring
joined
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Granted
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EP90400752A
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German (de)
French (fr)
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EP0391759B1 (en
Inventor
Fereydoun Garajedagui
Antonio Moretti
Bernard Favre
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Renault SAS
Regie Nationale des Usines Renault
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Renault SAS
Regie Nationale des Usines Renault
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Publication of EP0391759A1 publication Critical patent/EP0391759A1/en
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/02—Seat parts
    • A47C7/28—Seat parts with tensioned springs, e.g. of flat type
    • A47C7/30—Seat parts with tensioned springs, e.g. of flat type with springs meandering in a flat plane

Definitions

  • the invention relates to a device for adjusting the tension of a support ply of a seat cushion, constituted by a spring ply with adjustable tension disposed between two opposite elements of a frame.
  • the publication FR-A 2 060 877 describes a seat in which the mutual distance of the two opposite elements is mechanically adjustable so as to modify the tension of the spring ply.
  • the publication FR-A 2 447 168 describes a bearing surface of a seat, constituted by springs of metal wire having undulations in the plane of the surface fixed by one end to a frame element of the seat and whose l the other end is attached to maneuverable adjustment members to modify the curvature of said corrugated wires.
  • the subject of the invention is an adjustment device applying a shape memory alloy whose arrangement makes it possible to vary the tension of the seat suspension ply.
  • the invention also relates to such a device in which the passage of a current through the shape memory material results in a deformation of the latter capable of varying the preload of the suspension ply.
  • the spring ply is joined to one of the elements of the frame by a shape memory material in order to obtain an increase in tension when it is brought by heating to a certain temperature, in association with a blocking device for the purpose of retaining said increase in voltage when said heating is suppressed.
  • FIG. 1 relates to the properties of an alloy wire (Ni - Ti) with shape memory.
  • This material deformed at low temperature returns to its initial shape when its temperature rises above a threshold called transformation temperature.
  • a wire or a spring made of a shape memory alloy which has undergone an elongation regains its initial length when it is brought to a temperature higher than the transformation temperature.
  • Curve A describes the variation of the stress ⁇ in N / mm2 as a function of the elongation ⁇ in% at low temperature (martensitic phase).
  • Curve B describes the variation of the stress as a function of the elongation beyond the transformation temperature (austenitic phase).
  • FIG. 2 schematically represents a seat frame defined by a structure 1 mounted on runners 2 designed to be fixed to the vehicle.
  • the structure has opposite transverse elements 3, 4 constituting the frame 5 supporting a sheet of springs 6 joined to the front element 3.
  • the springs 6 respectively constituted by wavy wires are mounted in tension using springs of suspension 7 on the structure.
  • the suspension springs 7 are joined for example to the element 3 by a shape memory element 10 which can be constituted by a wire or by a spring.
  • one or more springs such as 7 (fig. 5, 6) are coupled to a traction cable 11 wound one or more times to prevent the sliding on a pulley 12 of a locking device 13 whose axis 22 carries a toothed wheel 23 capable of being immobilized by an element or pawl 24.
  • the pawl 24 is a spring pawl 25 on which an electromagnetic control 26 acts for example and the end of the cable 11 is joined to the element 3 of the seat by the shape memory material 10.
  • the cable 11 can also rest on the pulley 12 and slide in a blocking device known per se, for example, by the publication FR-A 2 589 206 which is immobilized on the structure 1 of the seat .
  • the device 13 can also be a locking member actuated, for example, by an axial biasing spring itself constituted by a shape memory material whose heating, by an electric current, allows the unlocking of the device, and consequently a traction of the cable 11 under the effect of the modification of the length of the material 10.
  • the spring made of shaped alloy material replaces the electromagnet 26.
  • FIG. 3 also shows the pulse contact 14 which allows the heating of the material 10.
  • the cable 11 carries an adjustable stop 17 capable of coming to bear on a seat element whose position is adjusted according to the maximum elongation characteristics of the material with memory (8% for an Ni - Ti alloy).
  • blocking device 13 by any equivalent device produced for example from cable clamps with electromechanical control of an electromagnet, or of an actuator using the properties of shape memory alloys.
  • the element 10 can also be formed from other alloys such as the Al - Cu - Zn or Al - Cu - Ni alloys.
  • the springs such as 7 may be grouped or connected together and be actuated by a single or two control assemblies including the cable 10 and the device 13 as has been shown in FIGS. 5 and 6.
  • Ni - Ti alloy allows a relatively large effort to be obtained for a given section of wire.
  • its electrical resistivity being high, heating can be obtained by a current of a few amps.
  • the transition temperature cannot exceed 100 ° C for this same alloy, the response of the element can be relatively slow during its cooling. In fact, the longer the cooling time, the smaller the difference between the temperature of the alloy and the ambient temperature.

Landscapes

  • Seats For Vehicles (AREA)
  • Springs (AREA)

Abstract

Device for adjusting the tension of supporting springs for a seat, constituted by a spring layer (6, 7) whose tension is adjustable disposed between two opposite elements (3, 4) of a frame (1), characterised in that the spring layer (6, 7) is connected to one (3 or 4) of the elements of the frame by a shape memory material (10) for the purpose of obtaining an increase in tension of the spring layer when it is taken, by heating, to a certain temperature, in association with a locking device (13), in particular for the purpose of retaining the said increase in tension when the said heating is removed. <IMAGE>

Description

L'invention concerne un dispositif de règlage de la tension d'une nappe d'appui d'un coussin de siège, constituée par une nappe à ressort à tension règlable disposée entre deux éléments opposés d'une armature.The invention relates to a device for adjusting the tension of a support ply of a seat cushion, constituted by a spring ply with adjustable tension disposed between two opposite elements of a frame.

La publication FR-A 2 060 877 décrit un siège dans lequel la distance mutuelle des deux éléments opposés est règlable mécaniquement de manière à modifier la tension de la nappe à ressorts.The publication FR-A 2 060 877 describes a seat in which the mutual distance of the two opposite elements is mechanically adjustable so as to modify the tension of the spring ply.

La publication FR-A 2 447 168 décrit une surface d'appui d'un siège, constituée par des ressorts en fil métallique présentant des ondulations dans le plan de la surface fixés par une extrémité à un élément d'armature du siège et dont l'autre extrémité est accrochée à des organes de règlage manoeuvrables pour modifier la courbure desdits fils ondulés.The publication FR-A 2 447 168 describes a bearing surface of a seat, constituted by springs of metal wire having undulations in the plane of the surface fixed by one end to a frame element of the seat and whose l the other end is attached to maneuverable adjustment members to modify the curvature of said corrugated wires.

Ces dispositifs ne permettent pas de modifier de manière rapide et aisée la conformation de la surface d'appui offerte par le siège de façon que la rigidité de la surface soit adaptée aux exigences de confort.These devices do not make it possible to quickly and easily modify the conformation of the bearing surface offered by the seat so that the rigidity of the surface is adapted to comfort requirements.

L'invention a pour objet un dispositif de règlage faisant application d'un alliage à mémoire de forme dont l'agencement permet de faire varier la tension de la nappe de suspension du siège.The subject of the invention is an adjustment device applying a shape memory alloy whose arrangement makes it possible to vary the tension of the seat suspension ply.

L'invention a également pour objet un tel dispositif dans lequel le passage d'un courant dans le matériau à mémoire de forme se traduit par une déformation de celui-ci apte à faire varier la précontrainte de la nappe de suspension.The invention also relates to such a device in which the passage of a current through the shape memory material results in a deformation of the latter capable of varying the preload of the suspension ply.

Selon l'invention, la nappe à ressorts est réunie à l'un des éléments de l'armature par un matériau à mémoire de forme dans le but d'obtenir un accroissement de tension lorsqu'il est porté par échauffement à une certaine température, en association avec un dispositif de blocage dans le but de conserver ledit accroissement de tension lors de la suppression dudit échauffement.According to the invention, the spring ply is joined to one of the elements of the frame by a shape memory material in order to obtain an increase in tension when it is brought by heating to a certain temperature, in association with a blocking device for the purpose of retaining said increase in voltage when said heating is suppressed.

D'autres caractéristiques et avantages du dispositif apparaîtront à la lecture d'une forme de réalisation de celui-ci faite en référence au dessin annexé dans lequel :

  • - La figure 1 est un diagramme des variations des contraintes en fonction des allongements d'un alliage à mémoire de forme,
  • - La figure 2 est une vue en perspective d'un siège équipé d'un dispositif de règlage de tension de la nappe,
  • - La figure 3 est une représentation schématique vue en coupe du dispositif de règlage de tension de la nappe,
  • - La figure 4 est une coupe partielle du dispositif de règlage de tension suivant la ligne IV-IV de la figure 3,
  • - Les figures 5 et 6 décrivent deux variantes d'implantation du dispositif sur une nappe à ressorts.
Other characteristics and advantages of the device will appear on reading an embodiment of the device made with reference to the appended drawing in which:
  • FIG. 1 is a diagram of the variations in stresses as a function of the elongations of a shape memory alloy,
  • FIG. 2 is a perspective view of a seat fitted with a device for adjusting the tension of the sheet,
  • FIG. 3 is a schematic representation in section view of the device for adjusting the tension of the sheet,
  • FIG. 4 is a partial section of the tension adjustment device along line IV-IV of FIG. 3,
  • - Figures 5 and 6 describe two alternative layouts of the device on a spring ply.

La figure 1 se rapporte aux propriétés d'un fil en alliage (Ni - Ti) à mémoire de forme.FIG. 1 relates to the properties of an alloy wire (Ni - Ti) with shape memory.

Ce matériau déformé à basse température retrouve la forme initiale lorsque sa température s'élève au-delà d'un seuil appelé température de transformation.This material deformed at low temperature returns to its initial shape when its temperature rises above a threshold called transformation temperature.

Ainsi par exemple, un fil ou un ressort en alliage à mémoire de forme qui a subi un allongement retrouve sa longueur initiale lorsqu'il est porté à une témpérature supérieure à la température de transformation.Thus, for example, a wire or a spring made of a shape memory alloy which has undergone an elongation regains its initial length when it is brought to a temperature higher than the transformation temperature.

La courbe A décrit la variation de la contrainte σ en N/mm2 en fonction de l'élongation ε en % à basse température (phase martensitique).Curve A describes the variation of the stress σ in N / mm2 as a function of the elongation ε in% at low temperature (martensitic phase).

La courbe B décrit la variation de la contrainte en fonction de l'élongation au-delà de la température de transformation (phase austénitique).Curve B describes the variation of the stress as a function of the elongation beyond the transformation temperature (austenitic phase).

Ces courbes permettent l'évaluation quantitative de l'effort fourni par un fil en alliage de forme du type Ni - Ti lors de la transformation. A titre d'exemple, un fil de 1 mm2 de section qui supporte un contrainte de 130 N voit sa longueur augmenter de 5 % environ à basse température caractérisée par le point M de la courbe A. Par échauffement, cette élongation se réduit à une valeur inférieure à 1 %, lorsque la contrainte demeure constante au cours du changememnt de phase. Cette valeur est caractérisée par le point N de la courbe B. Lorsque la contrainte augmente lors du changement de phase, par exemple sous l'action d'un ressort monté en série avec le fil en alliage à mémoire de forme, la nouvelle valeur de l'élongation est caractérisée par le point N′ de la courbe B.These curves allow the quantitative evaluation of the force provided by an alloy wire of the Ni - Ti type during the transformation. By way of example, a wire with a cross-section of 1 mm 2 which supports a constraint of 130 N sees its length increase by about 5% at low temperature characterized by point M of curve A. By heating, this elongation is reduced to a value less than 1%, when the constraint remains constant during phase change. This value is characterized by the point N of the curve B. When the stress increases during the phase change, for example under the action of a spring mounted in series with the shape memory alloy wire, the new value of the elongation is characterized by the point N ′ of the curve B.

La figure 2 représente schématiquement une armature de siège définie par une structure 1 montée sur des glissières 2 conçues pour être fixées sur le véhicule.FIG. 2 schematically represents a seat frame defined by a structure 1 mounted on runners 2 designed to be fixed to the vehicle.

La structure possède des éléments transversaux opposés 3, 4 constitutifs du cadre 5 support d'une nappe à ressorts 6 réunie à l'élément antérieur 3. Les ressorts 6 respectivement constitués par des fils ondulés sont montés en tension à l'aide de ressorts de suspension 7 sur la structure.The structure has opposite transverse elements 3, 4 constituting the frame 5 supporting a sheet of springs 6 joined to the front element 3. The springs 6 respectively constituted by wavy wires are mounted in tension using springs of suspension 7 on the structure.

Selon l'invention, les ressorts de suspension 7 sont réunis par exemple à l'élément 3 par un élément à mémoire de forme 10 qui peut être constitué par un fil ou par un ressort.According to the invention, the suspension springs 7 are joined for example to the element 3 by a shape memory element 10 which can be constituted by a wire or by a spring.

A cet effet, un ou plusieurs ressorts tels que 7 (fig. 5, 6) sont attelés à un câble de traction 11 enroulé une ou plusieurs fois pour éviter le glissement sur une poulie 12 d'un dispositif de blocage 13 dont l'axe 22 porte une roue dentée 23 susceptible d'être immobilisée par un élément ou cliquet 24. Le cliquet 24 est un cliquet à ressort 25 sur lequel agit une commande électromagnétique 26 par exemple et l'extrémité du câble 11 est réunie à l'élément 3 du siège par le matériau 10 à mémoire de forme.For this purpose, one or more springs such as 7 (fig. 5, 6) are coupled to a traction cable 11 wound one or more times to prevent the sliding on a pulley 12 of a locking device 13 whose axis 22 carries a toothed wheel 23 capable of being immobilized by an element or pawl 24. The pawl 24 is a spring pawl 25 on which an electromagnetic control 26 acts for example and the end of the cable 11 is joined to the element 3 of the seat by the shape memory material 10.

A titre de variante, le câble 11 peut aussi reposer sur la poulie 12 et coulisser dans un dispositif de blocage connu en soi, à titre d'exemple, par la publication FR-A 2 589 206 qui est immobilisée sur la structure 1 du siège. Le dispositif 13 peut être également un organe de verrouillage actionné, par exemple, par un ressort de sollicitation axiale lui-même constitué par un matériau à mémoire de forme dont le chauffage, par un courant électrique, permet le déverouillage du dispositif, et par voie de conséquence une traction du câble 11 sous l'effet de la modification de longueur du matériau 10. Dans ce cas, le ressort en matériau à alliage de forme remplace l'électro-aimant 26.Alternatively, the cable 11 can also rest on the pulley 12 and slide in a blocking device known per se, for example, by the publication FR-A 2 589 206 which is immobilized on the structure 1 of the seat . The device 13 can also be a locking member actuated, for example, by an axial biasing spring itself constituted by a shape memory material whose heating, by an electric current, allows the unlocking of the device, and consequently a traction of the cable 11 under the effect of the modification of the length of the material 10. In this case, the spring made of shaped alloy material replaces the electromagnet 26.

La figure 3 montre aussi le contact à impulsion 14 qui permet la chauffe du matériau 10.FIG. 3 also shows the pulse contact 14 which allows the heating of the material 10.

Selon l'exemple représenté à la figure 3, au cours du chauffage de l'élément 10, le cliquet 24 est dégagé de la roue dentée 23 de sorte qu'au cours du chauffage, le dispositif est déverrouillé. Ce mode opératoire permet d'augmenter la tension de la surface d'appui du siège par échauffement des éléments 10 et pendant ledit échauffement seulement.According to the example shown in Figure 3, during the heating of the element 10, the pawl 24 is released from the toothed wheel 23 so that during heating, the device is unlocked. This operating mode makes it possible to increase the tension of the seat support surface by heating the elements 10 and during said heating only.

Si l'on désire réduire la tension de la surface d'appui, en principe seule la commande du dispositif 13 est alimentée dans le but d'autoriser l'allongement de l'élément 10 sous l'effet des ressorts 7 et de la charge éventuelle du siège. Toutefois, cette opération de réduction de la tension pourrait nécessiter un préchauffage de l'élément 10 afin de faciliter le déverrouillage du dispositif 13 et le retour progressif vers une tension de nappe plus faible.If it is desired to reduce the tension of the bearing surface, in principle only the control of the device 13 is supplied with the aim of authorizing the elongation of the element 10 under the effect of the springs 7 and of the load possible seat. However, this voltage reduction operation could require preheating of the element 10 in order to facilitate the unlocking of the device 13 and the gradual return to a lower sheet tension.

Dans le but d'éviter un allongement excessif et préjudiciable de l'élément 10, le câble 11 porte une butée ajustable 17 susceptible de venir en appui sur un élément du siège dont la position est réglée en fonction des caractéristiques d'allongement maximales du matériau à mémoire (8% pour un alliage Ni - Ti).In order to avoid excessive and harmful elongation of the element 10, the cable 11 carries an adjustable stop 17 capable of coming to bear on a seat element whose position is adjusted according to the maximum elongation characteristics of the material with memory (8% for an Ni - Ti alloy).

Sans sortir du cadre de l'invention, il sera bien entendu possible de remplacer le dispositif de blocage 13 par tout dispositif équivalent réalisé par exemple à partir de pinces à câble à commande électromécanique d'un électro-aimant, ou d'un actionneur utilisant les propriétés des alliages à mémoire de forme.Without departing from the scope of the invention, it will of course be possible to replace the blocking device 13 by any equivalent device produced for example from cable clamps with electromechanical control of an electromagnet, or of an actuator using the properties of shape memory alloys.

L'élément 10 peut également être formé à partir d'autres alliages tels que les alliages Al - Cu - Zn ou Al - Cu - Ni.The element 10 can also be formed from other alloys such as the Al - Cu - Zn or Al - Cu - Ni alloys.

De même, les ressorts tels que 7 pourront être groupés ou reliés entre eux et être actionnés par un seul ou deux ensembles de commande incluant le câble 10 et le dispositif 13 ainsi que cela a été représenté aux figures 5 et 6.Likewise, the springs such as 7 may be grouped or connected together and be actuated by a single or two control assemblies including the cable 10 and the device 13 as has been shown in FIGS. 5 and 6.

L'alliage Ni - Ti permet l'obtention d'un effort relativement important pour une section de fil donnée. De plus, sa résistivité électrique étant importante, l'échauffement peut être obtenu par un courant de quelques ampères. Par contre, du fait que la température de transition ne peut excèder 100° C pour ce même alliage, la réponse de l'élément peut être relativement lente lors de son refroidissement. En effet, le temps de refroidissement est d'autant plus long que la différence entre la température de l'alliage et la température ambiante est faible.The Ni - Ti alloy allows a relatively large effort to be obtained for a given section of wire. In addition, its electrical resistivity being high, heating can be obtained by a current of a few amps. On the other hand, since the transition temperature cannot exceed 100 ° C for this same alloy, the response of the element can be relatively slow during its cooling. In fact, the longer the cooling time, the smaller the difference between the temperature of the alloy and the ambient temperature.

De ce fait, il peut s'avérer intéressant d'employer un alliage différent tel que l'alliage Al - Cu - Ni pour lequel la température de transformation peut être fixée à une valeur sensiblement plus grande. Pour diminuer ce temps de refroidissement, on peut également associer à l'élément 10 un système de refroidissement avec un échangeur à air ou à liquide.Therefore, it may be advantageous to use a different alloy such as the Al - Cu - Ni alloy for which the transformation temperature can be set at a significantly greater value. To reduce this cooling time, it is also possible to associate element 10 with a cooling system with an air or liquid exchanger.

Claims (6)

1/ Dispositif de règlage de la tension d'une nappe d'appui d'un siège, constituée par une nappe à ressorts (6, 7) à tension règlable disposée entre deux éléments opposés (3, 4) d'une armature (1), caractérisé par le fait que la nappe à ressorts (6, 7) est réunie à l'un (3 ou 4) des éléments de l'armature par un matériau à mémoire de forme (10) dans le but d'obtenir un accroissement de la tension de la nappe lorsqu'il est porté par échauffement à une certaine température, en association avec un dispositif de blocage (13), notamment dans le but de conserver ledit accroissement de tension lors de la suppression dudit échaufement. 1 / Device for adjusting the tension of a seat support ply, constituted by a spring ply (6, 7) with adjustable tension disposed between two opposite elements (3, 4) of a frame (1 ), characterized in that the spring ply (6, 7) is joined to one (3 or 4) of the elements of the frame by a shape memory material (10) in order to obtain a increase in the tension of the sheet when it is brought up by heating to a certain temperature, in association with a blocking device (13), in particular for the purpose of retaining said increase in tension during the removal of said heating. 2/ Dispositif de règlage selon la revendication 1, caractérisé par le fait que l'un au moins de ressorts (7) est réuni par son extrémité à un élément de traction (10, 11) en partie constitué par le matériau à mémoire de forme. 2 / adjusting device according to claim 1, characterized in that at least one of springs (7) is joined at its end to a traction element (10, 11) partly constituted by the shape memory material . 3/ Dispositif selon la revendication 2, caractérisé par le fait que l'élément de traction est constitué par un câble (11) dont une extrémité est réunie à l'élément (3) de l'armature, par l'intermédiaire du matériau à mémoire de forme, tandis, que l'autre extrémité est réunie à un ressort (7) de suspension de la nappe (6) et sur le trajet duquel est monté un dispositif de blocage (13) dans le but de s'opposer à la baisse de tension de la nappe lors de la suppression de l'échauffement du matériau à mémoire de forme. 3 / Device according to claim 2, characterized in that the traction element consists of a cable (11), one end of which is joined to the element (3) of the frame, by means of the material to be shape memory, while the other end is joined to a spring (7) for suspending the sheet (6) and on the path of which is mounted a locking device (13) in order to oppose the drop in tension of the sheet when the heating of the shape memory material is suppressed. 4/ Dispositif selon la revendication 3, caractérisé par le fait que le dispositif de blocage est constitué par un mécanisme de verrouillage et d'immobilisation du câble sollicité dans le sens du déverrouillage par un élément (24) qui permet d'obtenir une augmentation de la tension de la surface d'appui du siège lorsque l'alliage à mémoire de forme est porté à la température de transition. 4 / Device according to claim 3, characterized in that the locking device is constituted by a locking mechanism and immobilization of the cable biased in the unlocking direction by an element (24) which allows to obtain an increase in the tension of the seat support surface when the shape memory alloy is brought to the transition temperature. 5/ Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé par le fait que l'élément de traction (11) des ressorts (7) de suspension porte un organe de butée (17) limiteur de l'allongement de l'élement (10) à mémoire de forme. 5 / Device according to any one of claims 1 to 4, characterized in that the traction element (11) of the springs (7) of suspension carries a stop member (17) limiting the elongation of the shape memory element (10). 6/ Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé par le fait que le dispositif de blocage (13) et l'élément de traction (10, 11) actionne, totalement ou partiellement, la nappe à ressorts (6, 7). 6 / Device according to any one of claims 1 to 5, characterized in that the locking device (13) and the traction element (10, 11) actuates, totally or partially, the spring ply (6, 7).
EP19900400752 1989-04-04 1990-03-20 Device for adjusting the tension of supporting springs for a seat cushion Expired - Lifetime EP0391759B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8904397 1989-04-04
FR8904397A FR2644996B1 (en) 1989-04-04 1989-04-04 DEVICE FOR ADJUSTING THE TENSION OF A SEAT CUSHION SUPPORT SHEET

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EP0391759A1 true EP0391759A1 (en) 1990-10-10
EP0391759B1 EP0391759B1 (en) 1993-02-24

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EP19900400752 Expired - Lifetime EP0391759B1 (en) 1989-04-04 1990-03-20 Device for adjusting the tension of supporting springs for a seat cushion

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DE (1) DE69000948T2 (en)
ES (1) ES2038042T3 (en)
FR (1) FR2644996B1 (en)

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US4556251A (en) * 1983-10-18 1985-12-03 Tachikawa Spring Co., Ltd. Lumbar support device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000012351A1 (en) * 1998-09-01 2000-03-09 Youngflex A.G. Suspension assembly
NL1028539C2 (en) * 2005-03-14 2006-09-18 Hans Voorwinde Beheer B V Device for preventing pressure ulcers.
WO2006098616A1 (en) * 2005-03-14 2006-09-21 Hans Voorwinde Beheer B.V. Device for preventing decubitus
US7823232B2 (en) 2005-03-14 2010-11-02 Hans Voorwinde Beheer B.V. Device for preventing decubitus

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DE69000948D1 (en) 1993-04-01
EP0391759B1 (en) 1993-02-24
DE69000948T2 (en) 1993-07-29
FR2644996B1 (en) 1991-06-07
ES2038042T3 (en) 1993-07-01
FR2644996A1 (en) 1990-10-05

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