EP2196177A1 - Medical bed comprising wheels with cleaning function, and two sliding frames - Google Patents

Abstract

The bed (1) has a lower frame (3) with legs (9) and wheels, and a height adjustment device for adjusting height of an upper frame (4) with respect to the lower frame. The lower frame includes a support (6) on which the legs and the device are fixed, and another support on which the wheels are fixed. The device maintains the upper frame to be isolated from the lower frame at rest when the bed is set at a position on legs. The device arranges the upper frame closer to the lower frame and raises the legs when the bed is set at a position on wheels.

Description

The invention relates to the field of hospital beds, and more specifically to medical beds for long-term care.

Most medical beds are wheeled, and are used both in the homes of individuals requiring special comfort and in specialized institutions, such as hospitals, retirement homes or clinics.

It is known to use medical beds on wheels to move them frequently, for example to transport a patient with reduced mobility and requiring special care in various places. Thus, a patient on the bed can be taken for example from a hospital room to an examination room, without patient transfer step that can disrupt it.

Such beds are mostly equipped with a braking system, allowing the locking of the casters when the bed, which has reached its destination, must remain stationary, for example during an examination or while the patient sleeps on it.

In general, the braking systems comprise a brake, including a pad-like element attached to one end of a rod, near the wheel, the other end of the rod interacting with a cam. The cam is integral with a shaft, integrated into a bed edge and controlling the brake: when the shaft pivots, it drives the cam, the cam then pushes on the rod and the shoe-like element descends and comes into contact with the roulette. The friction caused then opposes the rotation of the wheel. When the cam stops pushing on the rod, the rod and the pad go up, releasing the wheel. The brake can be actuated electronically or mechanically.

The braking system can be operated independently on each wheel, as in the example described in the document WO 00/51830 , HILL ROM, or can be centralized, the blocking being done simultaneously on each wheel, as described for example in the document US 2002/066142 of OSBORNE.

The presence of casters on a bed is usually associated with hospitals or other institutions providing medical care, and so evokes the disease for a user, while the bed can be used simply in the case where the user has reduced mobility or to increase comfort.

Indeed, some people, for example who have a reduced mobility or who simply wish to increase their comfort, can use a specialized bed for a long time, for example over several weeks, or even months, In general, in this case, the bed is not intended to be moved, and therefore remains in the same place, in the patient's room, for example at home or in the room of a clinic. Therefore, it is preferable to minimize the medical aspect of such beds, to maintain a "normal" environment for the user.

However, the mass of such beds can reach up to hundred kilograms, especially because of the equipment, for example barriers, an adjustable bed base or a stem, which may need the user. In addition, for example to have access under the bed to ensure optimal hygiene, it is necessary to keep the possibility of moving the bed. Therefore, it is best to keep wheels on the bed to facilitate its movement.

In addition, the bed must remain still when the user is above, so that the wheels must not be released accidentally.

As a result, a simple braking system is insufficient.

There are also known medical beds including wheels called "household", which can be hidden. These beds generally comprise a frame on which are fixed the feet of the bed, a device for adjusting the height of the bed base relative to the frame and casters mounted on rods and sliding relative to the feet of the bed. In normal operation, the device for adjusting the height of the bed base tends to spread the frame of the frame, the bed resting steadily on the feet. However, by operating the height adjustment device in reverse of its normal operation while making it rest on the wheels in contact with the ground, the feet are lifted by the sliding of the rollers, so that the The entire bed rests on the casters and can be moved.

Two types of embodiments are generally used.

The first achievement is to connect the rods of the wheels to the bed. The wheels are then in a retracted position when the frame is removed from the frame. Then, when the bed frame approaches the frame and reaches a height determined relative to the frame, the wheels come into contact with the ground. Thanks to the height adjustment device, the feet are then raised, and the bed rests on the wheels. An example of this realization is given in the document EP 0 433 737 , wherein the height adjustment device is a column device.

The second embodiment consists in permanently leaving the wheels in contact with the ground. When the bed frame is removed from the frame, the bed rests on the feet, the casters being independent of the rest of the bed and supporting only their own weight. Then, the box spring is closer to the frame until it bears on the rods of the wheels, transferring its weight on it. The device for adjusting the height of the bed base, which always tends to bring the bed frame and the frame, then pulls on the feet that are reassembled.

The height adjustment device may be for example formed of braces actuated by an electric jack, which is reversed to raise the feet, as described in the document EP 1 913 847 from EDENA.

Preferably, the rollers slide in the tubular feet so that when the bed rests on the feet, the casters are hidden from the user. The medical aspect of the bed is then concealed, while the casters can still be used.

However, the "household" casters feature can be tricky to perform.

Indeed, first of all the guiding of the casters in the feet requires having to master with precision the games that can exist between the rods of the casters and the guide element.

Furthermore, the points on which the bed base can be supported are limited to the number of rollers of the bed, typically four. In order to ensure contact between the bed base and the support points, the bed frame is generally provided with specific bearing surfaces, able to come into contact with the rods of the rollers. It must therefore be possible to ensure a sufficiently precise guidance of these bearing surfaces of the bed base on the points of support. The realization of this guidance can be tedious especially in the case where the bed is produced independently of the rest of the bed.

In addition, in such beds, the height adjustment device is supported on the casters by means of the bed, and therefore any connection between the bed frame and a bed member is solicited during the lifting of the feet, and must therefore be designed in function, making the achievement of the independence of the bed base relative to the rest of the bed even more delicate.

Finally, it is necessary that the bed base takes support simultaneously on each wheel, so as not to destabilize the whole or to break a roulette wheel. This supposes to maintain a sufficient flatness of the bed base, which can be difficult in particular because of the disturbances of the initial games which can occur during sudden movements of the user.

The present invention aims in particular to remedy these problems.

A first object of the invention is to provide a medical bed comprising a function of "household" wheels, simple and robust design.

A second object of the invention is to provide a medical bed comprising a household rollers function for which the medical aspect is minimized.

A third object of the invention is to provide a medical bed comprising a household rollers whose bed is independent of the rest of the bed.

• un premier cadre sur lequel les pieds et le dispositif de réglage de la hauteur sont fixés ;
• un deuxième cadre sur lequel les roulettes sont fixées,

le cadre sur roulettes étant monté coulissant par rapport au cadre sur pieds, et le lit pouvant prendre deux positions :

• une position sur pieds dans laquelle le bâti supérieur et le dispositif de réglage de la hauteur sont supportés par le cadre sur pieds, le dispositif de réglage de la hauteur maintenant le bâti supérieur écarté du bâti inférieur,
• une position sur roulettes dans laquelle l'ensemble du lit repose sur le cadre sur roulettes, le dispositif de réglage de la hauteur prenant appui sur le cadre sur roulettes pour rapprocher le bâti supérieur du bâti inférieur et relever les pieds.

To this end, the invention provides a bed comprising a lower frame and an upper frame, the lower frame comprising feet and rollers, the bed further comprising a device for adjusting the height of the upper frame relative to the lower frame, the lower frame comprising two frames:

• a first frame on which the feet and the height adjuster are fixed;
• a second frame on which the wheels are fixed,

the frame on wheels being slidably mounted relative to the frame on feet, and the bed can take two positions:

• a standing position in which the upper frame and the height adjustment device are supported by the standing frame, the height adjustment device holding the upper frame away from the lower frame,
• a position on wheels in which the entire bed rests on the frame on wheels, the height adjustment device resting on the frame on wheels to bring the upper frame of the lower frame and lift the feet.

The guiding of all casters is then ensured by a single guide: that of the frame on wheels.

The frame on wheels is for example housed in the frame on feet, a game being left between the two frames, so that there is only one apparent frame.

According to a first embodiment, the device for adjusting the height of the upper frame relative to the lower frame comprises cross bars whose upper end region is supported on the frame on wheels when the bed is in position on wheels. This avoids having to guide the upper frame to bring it into contact with the frame on wheels.

Advantageously, the upper region of the bars of the braces is provided with a bracket, so that the support with the frame on wheels is a plane support.

According to a second embodiment, the upper frame is supported on the frame on wheels when the bed is in position on wheels.

Advantageously, the frame on wheels comprises lugs protruding vertically.

The feet each comprise for example a hollow element in which a wheel is slidably mounted.

A sleeve can be attached around each hollow element of the feet, constituting a removable decorative element.

The feet are for example provided with pads, the pads being in contact with the ground when the bed is in position on feet, to prevent movement of the frame on feet.

In a particular embodiment, the rollers are permanently in contact with the ground.

• la figure 1 est une vue en perspective d'un lit comprenant une fonction roulettes de « ménage » en position sur pieds avec un bâti supérieur surélevé par rapport à un bâti inférieur ;
• la figure 2 est une vue latérale selon un longeron du lit de la figure 1 ;
• la figure 3 une vue latérale selon une traverse du lit de la figure 1 ;
• la figure 4 est une vue de détail de la figure 3 au niveau d'un pied du lit ;
• la figure 5 est une vue de coupe de la figure 3 montrant la position relative des deux cadres du lit en position sur pieds ;
• la figure 6 est une vue latérale selon un longeron du lit de la figure 1 avec le bâti supérieur à une hauteur minimale par rapport au bâti inférieur ;
• la figure 7 est une vue latérale selon une traverse du lit de la figure 5 ;
• la figure 8 est une vue similaire à celle de la figure 2 dans laquelle le lit est en position sur roulettes ;
• la figure 9 est une vue latérale du lit de la figure 8 selon une première traverse ;
• la figure 10 est une vue latérale du lit de la figure 8 selon une deuxième traverse ;
• la figure 11 est une vue de détail de la figure 10 au niveau d'un pied du lit ;
• la figure 12 est une vue en coupe de la figure 10 montrant la position relative des deux cadres du lit dans la position sur roulettes ;
• la figure 13 est une vue en perspective du lit de la figure 8 ;
• la figure 14 est une vue en perspective du cadre sur pieds sur lequel est monté un dispositif de réglage de la hauteur ;
• la figure 15 est une vue en perspective du cadre sur roulettes sur lequel les roulettes sont fixées.

Other objects and advantages of the invention will become apparent in the light of the description given hereinafter with reference to the appended drawings in which:

• the figure 1 is a perspective view of a bed comprising a "household" caster function in upright position with an upper frame elevated relative to a lower frame;
• the figure 2 is a side view along a spar of the bed of the figure 1 ;
• the figure 3 a side view along a cross of the bed of the figure 1 ;
• the figure 4 is a detail view of the figure 3 at the foot of the bed;
• the figure 5 is a sectional view of the figure 3 showing the relative position of the two frames of the bed in standing position;
• the figure 6 is a side view along a spar of the bed of the figure 1 with the upper frame at a minimum height relative to the lower frame;
• the figure 7 is a side view along a cross of the bed of the figure 5 ;
• the figure 8 is a view similar to that of the figure 2 wherein the bed is in roll position;
• the figure 9 is a side view of the bed of the figure 8 according to a first cross;
• the figure 10 is a side view of the bed of the figure 8 according to a second cross;
• the figure 11 is a detail view of the figure 10 at the foot of the bed;
• the figure 12 is a sectional view of the figure 10 showing the relative position of the two frames of the bed in the position on wheels;
• the figure 13 is a perspective view of the bed of the figure 8 ;
• the figure 14 is a perspective view of the frame on which is mounted a height adjustment device;
• the figure 15 is a perspective view of the frame on wheels on which the wheels are fixed.

On the figure 1 is represented a bed 1 on wheels 2, for example for medical application. The bed 1 comprises a frame comprising a lower frame 3 and a device 5 for adjusting the height of a frame 4 greater than the lower frame 3.

The lower frame 3 includes two frames.

A first frame 6 comprises two longitudinal members 7 connected by two cross members 8 and feet 9 fixed at the intersection of the longitudinal members with the cross members. The feet 9 are for example in the form of cylindrical hollow elements, of greater diameter than the wheels, open at both ends and welded between the cross members 8 and the longitudinal members 7. A pad 10, that is to say an element with a high coefficient of friction can be fixed under each foot 9. According to a particular embodiment, two holes 11 are distributed longitudinally on each crossbeam 8.

A second frame 12 also comprises two longitudinal members 13 connected by two crosspieces 14 and rollers 2 mounted at the end of rods 15 and fixed to the junction between the longitudinal members 13 and the crosspieces 14. The beams 13 and cross members 14 of the second frame 12 are substantially longer than those of the first frame 6. Each rod 15 can be pivotally mounted about its axis, so that the rollers 2 are multidirectional. According to the particular embodiment, each crosspiece 14 comprises two lugs 16 projecting vertically, distributed longitudinally on the crosspiece 14.

The frame 6 on legs and the frame 12 on wheels are assembled so that the second frame 12 retains an accessible section on its upper face, opposite to the rollers 2, that is to say a section not covered by the first frame 6 .

According to the particular embodiment, the frame 6 on feet is hollow, and the cross members 14 and longitudinal members 13 of the frame 12 on wheels are housed respectively in the cross members 8 and 7 of the frame 6 on legs, so that the rods 15 and the rollers 2 are found in the hollow elements of the feet 9, the lugs 16 of the second frame 12 are aligned with the holes 11 of the frame 6 on feet and they extend at least partially above the frame 6 on feet. The lugs 16 are then accessible. A vertical clearance is left between the first frame 6 and the second frame 12.

The bed 1 further comprises an upper frame 4 mounted on the frame, comprising for example a frame 17, on which is fixed a surface 18 of coating. The coating surface 18 may comprise two parts hinged to the frame 17 about an axis parallel to the sleepers: a portion 19 for the legs of a user and a portion 20 for the bust.

The upper frame 4 may include equipment for a user such as a gallows, barriers or a head and a footboard.

The device 5 for adjusting the height of the upper frame 4 relative to the lower frame 3 is fixed on the frame 6 on feet and under the upper frame 4.

The bed 1 can then take two positions.

In a first position, said feet, the upper frame 4 and the height adjustment device 5 are supported by the frame 6 on feet, in contact with the ground via the feet 9. The device 5 is in a so-called normal mode, that is to say it operates to maintain the upper frame 4 at a height determined relative to the lower frame 3 according to the setting of a user, or the device 5 is inactive.

In this position, the frame 12 on wheels is independent of the rest of bed 1. The weight of the upper frame 4, and therefore everything on it, including a user who would be installed, is supported by the frame 6 on the feet 9. The bed 1 is thus immobilized by the pads 10, the rollers 2 not being usable, and the bed 1 is stable on the feet 9.

In a second position, called on wheels 2, the entire weight of the bed 1 is supported by the frame 12 on wheels, in contact with the ground via the rollers 2.

For this purpose, from the position on feet, the device 5 is supported on the frame 12 on wheels and goes into a reverse mode, in which it works to bring the upper frame 4 of the frame 3 below. A support on the free section of the frame 12 on wheels can raise the frame 6 on feet and thus the feet 9 by sliding the frame 12 on wheels in the frame 6 on feet.

For example, the device 5 for adjusting the height is supported on the frame 12 on wheels, on its accessible section, through the upper frame 4, in contact with the frame 12 on wheels. Thus, the weight of the frame 6 on feet and the device 5 for adjusting the height is transferred to the frame 12 on wheels via the connection between the upper frame 4 and the device 5.

The lifting of the frame 6 on feet is possible thanks to the clearance between the two frames 6 and 12. The lifting height of the frame 6 on feet must be sufficient so that there is no point of contact between the frame 6 on feet and the ground. This height is a few millimeters, preferably less than 20 mm, to not unnecessarily reveal the wheels 2.

From the position on wheels, to put the bed 1 in position on feet, the device 5 of height adjustment brings the feet 9 in contact with the ground, then goes inactive, so that it no longer relies on the frame 12 on wheels which becomes independent, and the weight is again transferred to the frame 6 on feet.

The support being on the complete frame 12 on wheels, the number of points of support and the place where they are placed are not restricted. Thus, supports may be made also for example on the longitudinal members 13 of the frame 12 on wheels. In addition, a single point of support allows a distribution of the load on the entire frame 12 on wheels, and thus ultimately on all rollers 2. Thus, in the case where the contact is made with the upper frame 4 , and that there is a flatness defect, the risk of breaking a rod 15 of a wheel 2 is decreased.

According to a first embodiment, the rollers 2 are in contact with the ground only when the upper frame 4 is at the minimum height of the frame 3. For example, the rods of the rollers are connected to the upper frame 4, so that when the frame 4 higher reaches a certain level, the rollers 2 come into contact with the ground, at the same time as the support on the frame 12 on wheels is achieved. When the upper frame 4 is raised, the wheels 2 are also raised.

According to a second embodiment, the rollers 2 are permanently in contact with the ground. When the bed 1 is in position on feet, the wheels 2 supporting any weight other than that of the frame 12 on wheels, they can not destabilize the bed 1.

According to the preferred embodiment, the device 5 of the frame comprises two identical braces 22 and a system 23 for actuating the braces 22, for example an electric jack.

A spider 22 comprises two bars 24 and 25 pivoting relative to each other about an axis parallel to the sleepers placed in a central region of the bars 24 and 25. The lower end of each bar 24 and 25 is mounted pivoting also about an axis parallel to the cross members 8 and 14 of the two frames 6 and 12. The lower end of one of the two bars 24 and 25 is also slidably mounted along a spar 7 of the first frame 6, by for example in a gutter fixed to the spar 7. Preferably, the bars 24 and 25 of a spider 22 are mounted on the face of a spar 7 turned towards the inside of the first frame 6.

The two braces 22 are mounted on the frame 6 on feet so that the axis of rotation of the bars 24 and 25 relative to each other and the axis of rotation of the bars 24 and 25 relative to the frame 6 on the feet of the two braces 22 are aligned. A connecting bar 26, parallel to the cross-members 8, is fixed between the non-slip bars 24 and 25 of the two braces 22. Thus, the two braces 22 are actuated simultaneously in identical manner.

The actuating system 23 is fixed on the one hand under a cross member 8 of the frame 6 on legs, and on the other hand on the bar 26 of the junction of the two braces 22.

Thus, the actuating system 23 tends to vary the angle between the upper ends of the bars 24 and 25 of the braces 22, and therefore the height of the upper ends relative to the frame 6 on feet.

The bars 24 and 25 are pivotally mounted on the upper frame 4. Thus, for example, the bars that are not mounted sliding on the frame 6 on feet are on the upper frame 4, and vice versa.

It is understood that in this way, thanks to the action of the actuating system 23, the height of the upper frame 4 relative to the lower frame 3 varies between two extreme positions defined by the values limits that can take the angle between the bars 24 and 25 of the braces 22.

• un état dans lequel le système 23 travaille pour maintenir le bâti 4 supérieur surélevé par rapport au bâti 3 inférieur. Le système 23 d'actionnement pousse sur les croisillons 22, c'est-à-dire qu'il exerce sur les croisillons 22 une force s'opposant au poids du bâti 4 supérieur, pour maintenir l'angle entre les barres 24 et 25 des croisillons 22 et donc pour maintenir le bâti 4 supérieur à une hauteur déterminée, le poids du bâti 4 supérieur tendant à agrandir l'angle pour rapprocher le bâti 4 supérieur du bâti 3 inférieur.
• un état au repos, dans lequel le système 23 ne travaille pas, c'est-à-dire qu'il n'exerce aucune force entre le cadre 6 sur pieds et le bâti 4 supérieur.

In the standing position, the actuating system 23 can be in two states:

• a state in which the system 23 works to keep the upper frame 4 raised with respect to the lower frame 3. The actuating system 23 pushes on the braces 22, that is to say that it exerts on the braces 22 a force opposing the weight of the upper frame 4, to maintain the angle between the bars 24 and 25 braces 22 and thus to maintain the upper frame 4 at a predetermined height, the weight of the upper frame 4 tends to enlarge the angle to bring the upper frame 4 of the frame 3 lower.
• a state at rest, in which the system 23 does not work, that is to say that it exerts no force between the frame 6 on feet and the upper frame 4.

To move to the position on wheels, the upper frame 4 is lowered until it reaches a given height relative to the lower frame 3. The adjustment device 5 being supported on the frame 12 on rollers, the actuating system 23 is then reversed to pull on the bar 26 for joining the braces 22, that is to say that it exerts a force tending to increase the angle between the bars 24 and 25 of the braces 22. This force is reflected in the frame 6 on feet which is raised.

The support of the adjustment device 5 on the frame 12 on wheels can be realized between an upper region 27 of the upper bars 24 and 25 of the braces 22 and the upper end of the lugs 16, projecting from the holes 11 of the frame 6 on feet. In this upper extreme region 27, on a lateral face of the bar 24, 25, a bracket 28 may be fixed thereto. The bracket 28 comprises a plane surface 29, making contact with the lug 16 in the form of a plane support. For this purpose, the flat surface 29 of the bracket 28 forms an angle α with a lower face 30 of the bar 24, 25, for example between 0 ° and 10 °.

Thanks to the support on the braces 22, the weight of the frame 6 on feet and the device 5 of height adjustment is directly transferred to the frame 12 on wheels without passing through the upper frame 4, the connection between the upper frame 4 and the bars 24 and 25 of the braces 22 then not being solicited.

Furthermore, it is then possible to move the contact surface of the braces 22 with the frame 12 on wheels, by adjusting the fulcrum on the upper 27 region of the bars 24 and 25 of the braces 22, so as to adjust the minimum space available between the upper frame 4 and the lower frame 3. Indeed, the greater the distance between the fulcrum and the end of the bars 24 and 25, the larger this space will be.

In addition, it is not necessary to accurately position the upper frame 4 relative to the lower frame 3, so as to match the bearing surfaces on the upper frame 4 with those on the frame 12 on wheels.

The elements of the bed 1 are made for example of metal, such as aluminum, or alloy, for example stainless steel. The metal elements of the lower frame 3 can be hidden for example by means of a decorated sleeve threaded over the hollow elements of the feet 9 and fixed under the first frame 6. Decorative wooden boards can be hung removably on the rails 7 and the cross members 8 of the first frame 6.

The bed 1 thus described makes it possible to simply hide the rollers 2 while retaining the possibility of using it to move the bed 1.

Indeed, only one guide, that of the second frame 12 in the frame 6 on feet, must be provided, simplifying the design compared to other beds in which a guide on the four rods casters must be provided.

In addition, the support points on the frame 12 on wheels can be placed anywhere, providing additional freedom in the design of the bed 1.

The bed 1 always rests, whatever its position, on a rigid complete frame, so that when the bed 1 is in position on wheels, the total weight is distributed over all the casters 2, providing strength and durability. bed stability 1 with respect to a bed supported by four caster rods.

• la liaison avec les croisillons 22 n'est pas sollicitée ;
• le positionnement précis du bâti 4 supérieur n'est pas nécessaire,

ce qui permet d'adapter le sommier et ses équipements aux besoins de l'utilisateur sans que la conception du châssis ne doive être revue.In the case where the support is made on the bars 24 and 25 of the braces 22, the upper frame 4, on which is generally mounted a bed base, is independent of the rest of the bed 1 because:

• the connection with the braces 22 is not requested;
• the precise positioning of the upper frame 4 is not necessary,

This makes it possible to adapt the bed base and its equipment to the needs of the user without the chassis design having to be reviewed.

By adjusting the space available under the upper frame 4, it is possible to customize the bed 1 to the equipment needs of users.

The maintenance of the rollers 2 is facilitated because they are left easily accessible by the hollow elements of the feet 9.

Claims (10)

Bed (1) comprising a lower frame (3) and an upper frame (4), the lower frame (3) comprising feet (9) and rollers (2), the bed (1) further comprising a device (5) ) frame of height adjustment (4) higher relative to the frame (3) lower the bed (1) being characterized in that the frame (3) includes two lower frames: - a first frame (6) on which the feet (9) and the device (5) for adjusting the height are fixed; a second frame (12) on which the rollers (2) are fixed, the frame (12) on wheels being slidably mounted relative to the frame (6) on feet, and the bed can take two positions: - a standing position in which the upper frame (4) and the height adjustment device (5) are supported by the frame (6) on feet, the device (5) for adjusting the height holding the frame (4) ) upper spaced apart from the frame (3) lower or being at rest, - A position on wheels in which the entire bed rests on the frame (12) on wheels, the device (5) for adjusting the height supported on the frame (12) on wheels to bring the frame (4) higher of the lower frame (3) and raise the feet (9). Bed (1) according to claim 1, wherein the frame (12) on wheels is housed in the frame (6) on feet, a game being left between the two frames (6,12). Bed (1) according to one of claims 1 or 2, wherein the device (5) for adjusting the height of the upper frame (4) relative to the frame (3) comprises lower bars (24,25) braces (22) a region (27) extreme upper rests on the frame (12) on wheels when the bed (1) is in position on wheels. Bed (1) according to claim 3 wherein the region (27) at the upper end of the bars (24,25) of the braces (22) is provided with a bracket (28), so that the support with the frame (12) ) on wheels is a plane support. Bed (1) according to claim 1 or 2, wherein the upper frame (4) is in contact with the frame (12) on wheels when the bed (1) is in roll position. Bed (1) according to one of claims 1 to 5, wherein the frame (12) on wheels comprises lugs (16) projecting vertically projecting at least partially above the frame (6) on feet and on which the device (5) height adjustment comes in support. Bed according to one of claims 1 to 6, wherein the feet (9) each comprise a hollow member in which a roller (2) is slidably mounted. Bed (1) according to claim 7, comprising a sleeve attached around each hollow element of the feet (9). Bed (1) according to one of claims 1 to 8, wherein the feet (9) are provided with pads (10), the pads (10) being in contact with the ground when the bed (1) is in position on feet. Bed (1) according to one of claims 1 to 9, wherein the rollers (2) are permanently in contact with the ground.

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