FR2759875A1

FR2759875A1 - Foldable body support used with mattress on beach

Info

Publication number: FR2759875A1
Application number: FR9702474A
Authority: FR
Inventors: Pierre Vandelanoite
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-02-27
Filing date: 1997-02-27
Publication date: 1998-08-28

Abstract

The support is used with a folding mattress that has articulated cushions (1,2,3,4). It is a rigid frame with two parts (5,6) which are articulated round axles (9a,9b). The first part (5) forms a back rest and the second part (6) forms a cervical support. In their open position the second part forms an extension of the first part and is blocked in this position by the end of the second part resting on the first part. A U-shaped support leg (12) has its branches (12a,12b) articulated on the top of the first part and forms an inverted V-shape with this.

Description

La présente invention concerne le domaine des siéges et supports d'appui corporels et notamment les accessoires mobiliers et plus spécialement repliables et portables et ainsi utilisables, en étant mis en place en tout endroit choisi par l'utilisateur, pour obtenir un support d'appui corporel confortable , notamment en position de decubitus dorsal.The present invention relates to the field of seats and body support supports and in particular furniture accessories and more especially foldable and portable and thus usable, being put in place at any location chosen by the user, to obtain a support support comfortable body, especially in the supine position.

Plus spécialement l'invention concerne un accessoire portable du type dit matelas de plage et donc adapté à procurer au sujet une pluralité de positionnements en fonction de l'inclinaison variable du haut du matelas.More specifically, the invention relates to a portable accessory of the type known as a beach mattress and therefore suitable for providing the subject with a plurality of positions as a function of the variable inclination of the top of the mattress.

A cet effet l'accessoire d'appui corporel, qui sera ci apurés desiané aeneralement sous l'appellation de matelas de plage , est du type constitué d'une part d'un support direct du corp, à usage de matelas et donc realisé en materiau de confort, souple et deformable, et d'autre part d'une structure rigide formant l'ossature porteuse, elle même repliable et susceptible d'être deployée selon une pluralité de positions.To this end, the body support accessory, which will be hereby cleared generally under the name of beach mattresses, is of the type consisting on the one hand of a direct support of the body, for the use of mattresses and therefore produced in material of comfort, flexible and deformable, and on the other hand of a rigid structure forming the supporting framework, itself foldable and capable of being deployed according to a plurality of positions.

On connait divers modes de réalisation de tels matelas de plage, qui vont du matelas souple simple sans autre appui, au matelas associé à des structures d'appui porteuses
Dans ie premier cas, ceiui du matelas simpie recomposé en plusieurs coussins successifs pour en permettre le repli, on obtient un ensemble leger et facilement transportable mais ne permettant qu'une position couchée unique, sans inclinaison relevée du dos ou de la tête. Dans le sacond cas on obtient un ensemble permettant une plus grande polyfonctionnalité avec diverses variantes dans le positionnement de l'appui dorsal et/ou cervical, mais au prix d'un poids elevé qui diminue les possibilité de transport, notamment lorsque l'utilisateur doit abandonner son vehicule assez loin du site de l'installation souhaitée.Various embodiments of such beach mattresses are known, which range from the simple flexible mattress without other support, to the mattress associated with load-bearing support structures.
In the first case, that of the simpy mattress recomposed into several successive cushions to allow it to be folded up, a light and easily transportable assembly is obtained, but allowing only a single lying position, without tilting up the back or the head. In the sacond case we obtain a set allowing greater polyfunctionality with various variants in the positioning of the dorsal and / or cervical support, but at the cost of a high weight which reduces the possibility of transport, especially when the user has to abandon your vehicle far enough from the site of the desired installation.

L'invention vise à remedier aux limites des accessoires de repos; du type matelas de plage actuellement connus et propose un ensemble présentant des qualités de confort remarquabies avec une grande souplesse d'utilisation selon des variantes de positionnement et de montage, tout en reduisant au minimum l'encombrement et le poids , donc en facilitant le port et donc les perspectives d'utilisation du matelas de repos, tant sur la plage qütà la campagne ou chez sol , sur terrasse ou à l'interieur; le matelas pouvant d'ailleurs servir de literie d'appoint.The invention aims to remedy the limits of rest accessories; of the currently known beach mattress type and offers a set having remarkable comfort qualities with great flexibility of use according to positioning and mounting variants, while reducing the bulk and the weight to a minimum, thus facilitating the carrying and therefore the prospects for using the sleeping mattress, both on the beach or in the countryside or at home, on the terrace or indoors; the mattress can also serve as extra bedding.

A cet effet l'invention concerne un support de repos corporel, notamment à usage de matelas de plage ou de loisir, du type constitué d'une part d'une pluralité de coussins articulés, formant matelas repliable, et d'autre part d'un chassis rigide formé de plusieurs volets articulés deplaçables entre une position de repli dans laquelle les dits volets sont dans des plans paralléles voisins et une position deployée dans laquelle les volets sont bloqués en formant entre eux un angle non nul, et le support de repos est caractérisé en ce que le dit chassis est constitué d'un premier volet pour appui dorsal, d'un second volet pour appui cervical, les deux volets etant articulés selon un axe de tourillonement , tel que dans la position de repli le second volet se situe contre et parallélement au premier volet, tandis que dans la position déployée le second volet se situe sensiblement dans le prolongement du premier volet etant bloqué dans cette position par appui d'une extremité du second volet sur le premier volet, et le chassis comporte en outre au moins une jambe d'appui articulée sur le premier volet et constituant avec le dit premier volet un V inversé d'angle variable, la jambe d'appui etant deplaçable entre une position repliée contre le dit premier volet et une position ecartée permettant une assise stable du dit premier volet reposant sur un plan de repos tel que le sol.To this end, the invention relates to a body rest support, in particular for the use of beach or leisure mattresses, of the type consisting on the one hand of a plurality of articulated cushions, forming a folding mattress, and on the other hand of a rigid frame formed by several articulated flaps displaceable between a fallback position in which the said flaps are in neighboring parallel planes and a deployed position in which the flaps are locked by forming a non-zero angle between them, and the rest support is characterized in that the said chassis consists of a first flap for back support, of a second flap for cervical support, the two flaps being articulated along an axis of journaling, such that in the folded position the second flap is located against and parallel to the first flap, while in the deployed position the second flap is located substantially in the extension of the first flap being blocked in this position by pressing an extrem ity of the second flap on the first flap, and the frame further comprises at least one support leg articulated on the first flap and constituting with said first flap an inverted V of variable angle, the support leg being movable between a folded position against said first flap and a spread position allowing a stable seat of said first flap resting on a rest plane such as the ground.

Et notamment la jambe d'appui est formée d'une structure en U, les extremités des branches etant articulées sur les cotés du premier volet, l'ensemble de la jambe d'appui etant ainsi repliable à l'exterleur du premier volet en s'inserant dans une position coplanaire avec ce dernier.And in particular the supporting leg is formed of a U-shaped structure, the ends of the branches being articulated on the sides of the first flap, the whole of the supporting leg thus being foldable to the outside of the first flap in s inserting in a coplanar position with the latter.

Plus particuliérement encore la jambe d'appui est articulée sur le premier volet selon le même axe de tourillonement constituant l'articulation du second volet sur le premier volet, l'axe etant formé d'un boulon avec écrou anti-retour, reunissant ainsi les deux volets et les deux branches de la jambe d'appui.More particularly still the support leg is articulated on the first flap along the same journaling axis constituting the articulation of the second flap on the first flap, the axis being formed of a bolt with non-return nut, thus bringing together the two flaps and the two branches of the supporting leg.

Selon une autre caractéristique, le premier volet est formé de deux montants lateraux réunis par des traverses rapportées sur la face arriére (opposée à la face d'appui dorsal en contact avec les coussinsj des dits montants , de façon à laisser libre l'espace interieur situé entre les montants ainsi apte à recevoir le second volet dans sa position repliée venant s'intercaler entre les montants et etant prévu avec une largeur permettant cette insertion, le second volet etant ainsi confondu dans le même plan général contenant le premier volet et la jambe d'appui, les trois elements disposés dans le même plan occupant
ainsi un volume minimum. Et selon encore une autre caractéristique, le chassis comporte un élément de solidarisation apte à relier la base du premier volet (correspondant à l'extremité opposée à l'extremité recevant l'axe de tourillonement) et la base de la jambe d'appui pour assurer le blocage de la jambe dans une position angulaire determinée par rapport au premier volet
Et de préférence cet element de solidarisation est constitué d'un lien souple non extensible solidaire par une extremité de la base du premier volet et comportant au moins une et de préférence une pluralité de surepaisseurs, telle qu'un noeud,, le dit lien etant apte à être engagée dans une encoche pratiquée sur la base de la jambe d'appui en empechant un ecartement angulaire de la jambe d'appui au delà d'une valeur maximum, l'ensemble constitué par le premier volet, la jambe d'appui et le lien souple formant un ensemble triangulé d'assise stable.According to another characteristic, the first flap is formed of two lateral uprights joined by crosspieces added on the rear face (opposite to the back support face in contact with the cushions of said uprights, so as to leave the interior space free located between the uprights thus able to receive the second flap in its folded position interposed between the uprights and being provided with a width allowing this insertion, the second flap being thus merged in the same general plane containing the first flap and the leg of support, the three elements arranged in the same occupying plane
thus a minimum volume. And according to yet another characteristic, the chassis comprises a fastening element capable of connecting the base of the first flap (corresponding to the end opposite to the end receiving the journal axis) and the base of the support leg for secure the leg in a determined angular position relative to the first flap
And preferably this fastening element consists of a flexible non-extensible link secured by one end of the base of the first flap and comprising at least one and preferably a plurality of extra thicknesses, such as a knot, said link being able to be engaged in a notch formed on the base of the support leg by preventing an angular spacing of the support leg beyond a maximum value, the assembly formed by the first flap, the support leg and the flexible link forming a triangulated set of stable seat.

Avantageusement le second volet est constitué de deux montants reliés par des traverses inserées entre les dits montants, qu'elle relient, une traverse terminale, située sur l'extrémité du second volet proche de son articulation sur le premier volet comporte en son miiieu une encoche apte à recevoir l'engagement du lien souple, en assurant le blocage de l'ensemble dans la position repliée et compactée.Advantageously, the second flap consists of two uprights connected by cross members inserted between said uprights, which it connects, a terminal cross-member, located on the end of the second flap close to its articulation on the first flap has in its middle a notch able to receive the engagement of the flexible link, ensuring the blocking of the assembly in the folded and compacted position.

Selon un mode de realisation preferentielle de l'invention, les coussins solidaires et articulés constituant le matelas proprement dit sont au nombre de quatre, soit un premier coussin central d'appui dorsal apte à reposer sur le premier volet et prolongé d'un
coté par un second coussin d'appui cervical, apte à reposer sur le second volet et ce coussin central est prolongé de l'autre coté par un troisiéme coussin apte au support fessier du sujet, l'un au moins des coussins est prévu avec des moyens de solidarisation amovibles pour permettre sa fixation sur le volet correspondand du chassis.According to a preferred embodiment of the invention, the integral and articulated cushions constituting the mattress proper are four in number, or a first central back support cushion capable of resting on the first flap and extended by
side by a second cervical support cushion, able to rest on the second flap and this central cushion is extended on the other side by a third cushion suitable for the subject's gluteal support, at least one of the cushions is provided with removable securing means to allow its attachment to the corresponding component of the chassis.

Et plus particuliérement le second coussin d'appui cervical comporte sur l'extremité supérieure de sa face arriére, orientée vers le second volet du chassis, une capuche ou coiffe apte à être engagée sur le sommet du dit second volet.And more particularly, the second cervical support cushion comprises, on the upper end of its rear face, oriented towards the second flap of the chassis, a hood or cap capable of being engaged on the top of said second flap.

Et selon encore un developpement de l'invention, le troisiéme coussin d'appui fessier est lui même prolongé par un quatriéme coussin pour le repos des jambes du sujet.And according to a further development of the invention, the third gluteal support cushion is itself extended by a fourth cushion for resting the legs of the subject.

D'autres caractéristiques et avantages de l'invention ressortiront encore de la description qui suit et qui est donnée à titre non limitatif et en se référant à une forme de réalisation préférentielle donnée à titre illustratif et sans caractére limitatif
Dans les dessins annexés, la figure 1 est une vue en perspective d'un matelas de plaqe selon l'invention, les figures 2a, 2b et 2c sont des vues en perspective de trois positionnements possibles du matelas de plage, représenté en situation et portant un sujet utilisateur, soit successivement en position de decubitus dorsal (2 c), couchée avec buste legerement relevé (2 b) et enfin couchée demi assise (2 a). Other characteristics and advantages of the invention will emerge from the following description which is given without limitation and with reference to a preferred embodiment given by way of illustration and without limitation
In the accompanying drawings, FIG. 1 is a perspective view of a bed mattress according to the invention, FIGS. 2a, 2b and 2c are perspective views of three possible positions of the beach mattress, shown in situation and bearing a user subject, either successively in the supine position (2 c), lying down with slightly raised bust (2 b) and finally lying half seated (2 a).

La figure 3 représente une vue en perspective de l'ensemble matelas de plage selon l'invention, et tel que représenté aux figures précédentes, en position repliée et compactée pour le transport et/ou le stockage.FIG. 3 represents a perspective view of the beach mattress assembly according to the invention, and as shown in the previous figures, in the folded and compacted position for transport and / or storage.

En se référent à l'ensemble des figures, on voit que le support corporel dit matelas de plage se compose de coussins formant matelas et au nombre de quatre, soit un coussin central 1, prolongé d'un coté, au delà de l'articulation la par le second coussin 2 d'appui cervical, eventuellement prévu avec un renforcement terminal en epaisseur 2', formant oreiller de confort.Referring to all of the figures, it can be seen that the body support known as a beach mattress is made up of cushions forming a mattress and four in number, ie a central cushion 1, extended on one side, beyond the joint the by the second cervical support cushion 2, possibly provided with a terminal reinforcement in thickness 2 ′, forming a comfort pillow.

Du cote oppose a iarticuiation la, se trouve l'articulation 2d du premier coussin par rapport au troisiéme coussin 3. Ce coussin 3 est lui même prolonqé, au delà de l'articulation 3a par le quatriém e coussin terminal 4.On the side opposite to the joint there is the joint 2d of the first cushion relative to the third cushion 3. This cushion 3 is itself extended, beyond the joint 3a by the fourth terminal cushion 4.

Le premier coussin d'appui dorsal est apte à reposer sur un premier volet 5 du chassis fixe, tandis que le deuxiéme coussin 2 est apte à reposer sur un second volet 6, l'ensemble coussin 2 et volet 6 procurant dans la position deployée de la figure 1 un appui cervical; et le deuxiéme coussin 2 comporte sur sa face arriére une coiffe 8 apte à être engagée sur le sommet du deuxiéme volet en assurant l'homogeneité de ensemble. The first back support cushion is able to rest on a first flap 5 of the fixed frame, while the second cushion 2 is able to rest on a second flap 6, the cushion 2 and flap 6 assembly providing in the deployed position of Figure 1 a cervical support; and the second cushion 2 has on its rear face a cap 8 capable of being engaged on the top of the second flap ensuring the homogeneity of the whole.

Les troisième et quatriéme coussins pour le repos respectivement fessier et jambaire du sujet peuvent reposer directement sur le sol, la structure rigide constituant le chassis etant limitée au premier volet 5 et second volet 6; ces deux v olets constituant le chassis d'appui rigide sont articulés entre eux selon un axe de tourillonement commun constitué des deux écrous et boulons anti retour a, b.The third and fourth cushions for the glute and leg rest respectively of the subject can rest directly on the ground, the rigid structure constituting the frame being limited to the first flap 5 and second flap 6; these two bolts constituting the rigid support frame are hinged together along a common journal axis consisting of the two nuts and non-return bolts a, b.

Le chassis rigide se complete de la jambe d'appui 12 formée d'un ensemble en U articulé par le sommet des branches 12a et 12b sur le premier volet selon les axes 9a et 9b.The rigid frame is completed by the support leg 12 formed by a U-shaped assembly articulated by the top of the branches 12a and 12b on the first flap along the axes 9a and 9b.

Comme on peut le voir des figures 1 et 3, le premier volet se compose de deux montants lateraux Ua etllb reliés par une pluralités de traverses horizontales paralléles lic rapportées sur une face (constituant la face arriére) du premier volet, en laissant libre ainsi l'espace interieur entre les deux montants, cet espace pouvant recevoir le second volet 6 dans la position de repli de ce dernier comme illustré à la figure 3, aprés basculement angulaire du second volet selon la flèche F1 (figure 1).As can be seen in Figures 1 and 3, the first component consists of two lateral uprights Ua etllb connected by a plurality of parallel horizontal crosspieces lic reported on one side (constituting the rear side) of the first component, thus leaving free the 'interior space between the two uprights, this space can receive the second flap 6 in the folded position of the latter as illustrated in Figure 3, after angular tilting of the second flap according to arrow F1 (Figure 1).

Les traverses 6c du second volet 6 relient les deux montants lateraux 6a et 6 b en restant à l'interieur du plan defini par ces deux montants, de façon à limiter l'encombrement.The crosspieces 6c of the second flap 6 connect the two lateral uprights 6a and 6b while remaining inside the plane defined by these two uprights, so as to limit the size.

La jambe d'appui 12 est en forme de U, la base du U 12c etant apte à reposer sur le sol et reliant les deux branches 12a et 12b; les extremités libres de ces deux branches sont à leur tour articulées sur les axes 9a et 9b, de sorte que l'ensemble formé par le premier volet
Set la jambe d'appui 12 constitue un V inversé d'angle variable.The support leg 12 is U-shaped, the base of the U 12c being able to rest on the ground and connecting the two branches 12a and 12b; the free ends of these two branches are in turn articulated on the axes 9a and 9b, so that the assembly formed by the first flap
Set the support leg 12 constitutes an inverted V of variable angle.

Dans la position compactée de la figure 3, la jambe d'appui présente ses branches 12a et 12b situées à l'exterieur et contre les montants lia et iib du premier volet, de sorte que le premier volet, la jambe d'appui et le second volet se situent dans un même plan procurant un compactage maximum.In the compacted position of FIG. 3, the support leg has its branches 12a and 12b situated outside and against the uprights 11a and 13b of the first flap, so that the first flap, the support leg and the second part are located in the same plane providing maximum compaction.

Dans la position deployée de la figure 1, la jambe d'appui est ecartée pour former avec le premier volet un angle non nul permettant l'assise stable de l'ensemble sur un plan d'appui, tel que le sol. Un lien souple 13 venu de la base du premier volet, et pourvu de nodosités, peut être engagé dans l'encoche 14 prévue sur la base 12c de la jambe d'appui pour empecher un plus grand ecartement sous le poids du sujet; une pluralité de noeuds permet ainsi de faire varier l'angle et autorise egalement une pluralité de positions, comme il apparaît des figures 2a et 2b
Ce lien peut encore être engagé dans une encoche 14' prévue sur la traverse inferieure du second volet 6 d'appui cervical; cette traverse dans la position bascule e du second volet vers a position de repli (selon la fléche F1 de la figure 1) vient en position haute et peut alors recevoir l'engagement du lien pour assurer la liaison de l'ensemble des volets dans la position fermée et compactée. In the deployed position of Figure 1, the support leg is spread to form with the first flap a non-zero angle allowing the stable seat of the assembly on a support surface, such as the ground. A flexible link 13 coming from the base of the first component, and provided with nodules, can be engaged in the notch 14 provided on the base 12c of the support leg to prevent greater spacing under the weight of the subject; a plurality of nodes thus makes it possible to vary the angle and also allows a plurality of positions, as it appears from FIGS. 2a and 2b
This link can also be engaged in a notch 14 'provided on the lower cross member of the second flap 6 of the cervical support; this crosspiece in the tilted position e of the second flap towards a fallback position (according to the arrow F1 in FIG. 1) comes into the high position and can then receive the engagement of the link to ensure the connection of all the flaps in the closed and compacted position.

Des lacets lateraux 15 venus de la base du premier coussin permettent de solidariser le coussin central, et par suite les autres coussins qui lui so nt solidaires sur le chassis suppport.Side laces 15 coming from the base of the first cushion make it possible to secure the central cushion, and consequently the other cushions which are integral with it on the supporting frame.

On comprend que l'ensemble ainsi decrit présente un volume minimal assurant une grande facilité de rangement et de transport, ceci pour un poids faible, les volets en bois, largement ajouré, sont peu pondereux; arrivé sur le site d'utilisation choisi (plage, pelouse, terrasse, interieur) l'usager peut en trés peu de temps et au prix de manoeuvres simples assurer le deploiement de l'ensemble et obtenir un repos confortable et relaxant correspondant à la position voulue et choisie par lui. It is understood that the assembly thus described has a minimum volume ensuring great ease of storage and transport, this for a low weight, the wooden shutters, largely perforated, are not very heavy; arrived on the chosen site of use (beach, lawn, terrace, interior) the user can in a very short time and at the cost of simple maneuvers ensure the deployment of the whole and obtain a comfortable and relaxing rest corresponding to the position wanted and chosen by him.

Claims

1- Body rest support, in particular for the use of beach or leisure mattresses, of the type consisting on the one hand of a plurality of articulated cushions (1, 2, 3 4,) forming a folding mattress, and on the other hand of a rigid chassis formed by several articulated flaps (5, 6), displaceable between a fallback position in which the said flaps are in neighboring parallel planes and a position deployed in the lamella the flaps are blocked by forming between them an angle not zero, and the rest support is characterized in that said frame consists of a first flap (5) for back support, a second flap (6) for cervical support, the two flaps being articulated along an axis of journal (9a, 9b), such that in the folded position the second flap BE located CGX and parallel to the first flap, while in the deployed position, the second flap is located substantially in the extension of the first flap being blocked in this position by support of an ext remitted from the second flap (6) on the first flap (5) and the chassis further comprises at least one support leg (12) articulated on the first flap and constituting with said first flap (5) an inverted V of variable angle, the support leg being displaceable between a folded position against said first flap and a spread position allowing a stable seat of said first flap resting on a plane of rest such as the ground.

2- rest support according to claim 1, characterized in that the support leg (12) is formed of a U-shaped structure, the ends of the branches (12a and 12b) being articulated on the sides of the first flap (5 ), the entire support leg thus being foldable outside the first flap by fitting in a coplanar position with the latter.

3- Rest support according to claim 1, further characterized in that the support leg (12) is articulated on the first flap (5) along the same journal axis constituting the articulation (9a and 9b) of the second flap (6) on the first flap (5), the axis being formed of a bolt with non-return nut, thus bringing together the two flaps (5 and 6) and the two branches (12a and 12b) of the leg d 'support (12).

4- rest support according to claim 1, characterized in that the first flap (5) is formed of two lateral uprights (lla and llb) joined by crosspieces (llc) reported on the rear face (opposite to the face of back support in contact with the cushions) of the said uprights, so as to leave free the interior space located between the uprights thus able to receive the second flap (6) in its folded position interposed between the uprights (lla and llb ) and being provided with a width allowing this insertion, the second flap being thus merged in the same general plane containing the first flap and the support leg, the three elements arranged in the same plane thus occupying a minimum volume.

5- Rest support according to claim 1 and further characterized in that the chassis comprises a fastening element capable of connecting the base of the first flap (5) corresponding to the end opposite to the end receiving the journal axis , and the base of the support leg (12) for blocking the leg in a determined angular position relative to the first flap 6- Rest support according to claim 5, characterized in that this securing element is constituted of a flexible non-extensible link (13 secured by one end of the base of the first flap and comprising at least one and preferably a plurality of extra thicknesses, such as a knot, said link being able to be engaged in a notch (14) made on the base of the support leg (12) by preventing an angular spacing of the support leg beyond a maximum value, the assembly formed by the first flap, the support leg and the flexible forman link t a triangulated set of stable seat.

7- Rest support according to claim 1 and characterized in that the second flap (6) consists of two uprights (6a and 6b) connected by sleepers (6C) exposed between said amounts, which they connect, a terminal cross (6c '), located on the end of the second flap close to its articulation on the first flap has in its middle a notch (14') capable of receiving the engagement of the flexible link, ensuring the blocking of the assembly in the folded and compacted position.

8- Rest support according to claim 1, characterized in that the integral and articulated cushions constituting the mattress itself are four in number, or a first central back support cushion (1) able to rest on the first flap ( 5), this first cushion (1) being extended on one side by a second cushion (2) of cervical support, able to rest on the second flap (6), and this central cushion (1) is extended on the opposite side by a third cushion (3) suitable for the subject's diaper support, and the central cushion (ij is provided with removable securing means such as laces, for its attachment to the support flap (5).

9- Rest support according to claim 8, characterized in that the second cervical support cushion (2) comprises a cap forming a hood oriented and open towards the back and capable of being engaged on the top of the second flap (6).

10- Rest support according to claim 9, characterized in that the third gluteal support cushion (3) is itself extended by a fourth cushion (4d for the rest of the legs of the subject and articulated on said third cushion.