# Patent

## Title
Patient bed with a retractable side barrier

## Abstract

A bed with a movable side barrier comprising a barrier element and a body is disclosed. The barrier element is associated with a deformable parallelogram mechanism hinged to a frame of the bed, said mechanism includes a deployment bar hinged between two parallel arms, and the barrier element is constrained to slide along vertical guide means carried by the body.

## Background
BACKGROUND
The present application is a continuation of U.S. application Ser. No. 12/166,892, which was filed Jul. 2, 2008, which issued as U.S. Pat. No. 7,712,167 on May 11, 2010, and which claimed priority, under 35 U.S.C. §119(a), of French National Application No. 07 56317 which was filed Jul. 6, 2007 and which is hereby incorporated by reference herein.
BACKGROUND
The present disclosure relates to a bed having a retractable side barrier, in particular a bed for a patient; the disclosure relates more particularly to an apparatus for enabling the height of the protection provided by said barrier to be increased, other things remaining equal.
A patient bed is known that is fitted with a side barrier mounted along a bedstead or frame of the bed. To give access to the bed in order to provide care, it is known to combine such a barrier with a deformable parallelogram mechanism having two pivot arms connected to the stationary frame of the bed or to an equivalent structure. Under such conditions, the barrier can be lowered or raised, substantially parallel to itself, the movement being accompanied by a movement in translation and rotation parallel to the longitudinal direction of the bed. In such a mechanism, it is desirable to increase the distance between the top bar of the barrier in the raised position and the bedding plane. Nevertheless, in this position, the bottom edge of the barrier should not be situated too high.
Furthermore, in the low position, the bottom edge of the barrier should be at a sufficient distance from the floor. These requirements are specified by a standard. Taking all of these constraints into account would lead to the height of the bedding plane to be raised in order to be able to associate a higher barrier with the bed. That is not desirable since said bedding plane needs to be relatively low in order to reduce the risk of injury if a patient falls out of bed, and in order to make it easier to move the patient out from the bed or to put the patient into the bed.
From a mechanical point of view, it is known to associate the deformable parallelogram mechanism with a bottom bar that is hinged to the two arms via its two ends. This bar is referred to herein as a deployment bar and it serves to make the movements of the mechanism more reliable by avoiding jamming. Conventionally, the bar is installed in a box that is fixed under the frame of the bed and that occupies a relatively large volume.
Document EP 1 053 735 describes a barrier that is hinged in its own plane and that comprises two portions, a bottom portion and a top portion that are approximately L-shaped. The dynamics of the deployment system are such that the two portions are further apart from each other when the barrier is in its high position than when it is in its low position. The space between the two portions can give rise to an accident. In addition, when the barrier is in its low position, it occupies a relatively large amount of space longitudinally.
The devices disclosed herein seek to reconcile all of the above-mentioned requirements while avoiding the above-analyzed drawbacks of the prior art device.
SUMMARY
Disclosed herein is a bed with a retractable side barrier of the type comprising a main barrier element associated with a deformable parallelogram mechanism hinged to a frame of the bed or to an analogous structure, said mechanism comprising two parallel arms, each including a hinge to said frame and a hinge to said main barrier element, a deployment bar being additionally hinged between said arms, wherein said mechanism is associated with a bottom extender attached to said deployment bar by a sliding connection, and wherein said extender is constrained to slide along vertical guide means carried by said main barrier elements.
By way of example, said extender may be carried by two pins each secured to the deployment bar, each pin being engaged in a respective slot of the extender. The arrangement could naturally be inverted.
Locking means (that do not form part of the invention and that are not described in detail below) are provided in order to define high and low stable positions, and possibly also an intermediate stable position for the main barrier elements, and consequently also for the extender, which in one possible embodiment can be deployed downwards when the main barrier element is in its high position, and on the contrary retracted into the main barrier element when the barrier element is in its low position.



BRIEF DESCRIPTION OF THE DRAWINGS
The devices disclosed herein can be better understood on reading the following description of side-barrier beds in accordance with this disclosure, given purely by way of example, and made with reference to the accompanying drawings, in which:
FIG. 1 is a partially cutaway diagrammatic perspective view of a bed fitted with a retractable side barrier in accordance with this disclosure;
FIG. 2 is a section II-II of FIG. 1;
FIG. 3 is a broken section III-III of FIG. 1;
FIG. 4 is a view similar to FIG. 3, showing a variant;
FIGS. 5 to 7 are diagrammatic views of the embodiment of FIG. 1, showing the dynamics of the system; and
FIGS. 8 and 9 are diagrams showing another embodiment in accordance with this disclosure, the device being shown respectively in its high position and in its low position.



DETAILED DESCRIPTION
In the drawings, there can be seen a diagram showing part of a bed 11 comprising a bedstead or frame 12 that is stationary and that supports a bedding plane having a mattress 14 placed thereon. A retractable side barrier 16 is arranged on the side of the bed and can move with general rotation-translation movement between a high position (FIG. 5) and a low position (FIG. 7). FIG. 6 shows an intermediate position. The barrier 16 comprises a main barrier element 18 associated with a deformable parallelogram mechanism 19 hinged to the frame 12 of the bed. The mechanism has two parallel pivot arms 20a, 20b each having a hinge 21a, 21b with said frame and a hinge 22a, 22b with the main barrier element. In addition, and in known manner, a deployment bar 26 is hinged between said arms 20a, 20b, by means of two hinge pins 50a, 50b in the example shown.
In the example described with reference to FIGS. 1 to 3 and 5 to 7, the mechanism comprises a longitudinal support 28 fastened to the bottom portion of the main barrier element 18 and forming an integral portion thereof. This longitudinal support co-operates with the main barrier element 18 to define a cavity 30 presenting a longitudinal opening 32 that extends along its bottom edge.
According to one disclosed characteristic, the mechanism is associated with a bottom extender 34 carried by two pins 36a, 36b that are spaced apart and secured to said deployment bar 26. Said extender 34 extends over practically the entire length of the main barrier element. It is attached to the deployment bar 26 via a sliding connection. Thus, the pins 36a, 36b are engaged in corresponding slots 38a, 38b of the extender 34. The extender is constrained to slide along vertical guide means carried by said main barrier element. More precisely, these guide means are constituted in this example by walls inside the cavity 30, which houses the top portion of the extender. In the example, the ends 40a, 40b of said extender that are longitudinally spaced apart come into sliding contact with two corresponding end walls 41a, 41b of the cavity 30. The cavity also houses the deployment bar 26 to which the extender 34 is attached. In the example described, the deployment bar 26 is horizontal as is the sliding connection (36a, 38a-36b, 38b), but that is not essential, it being possible for the arrangement to slope somewhat.
In the example, the two parallel arms 20a, 20b are outside the cavity defined by the support 28. They extend between the edge of the bed and the main barrier element 18 proper.
The extender 34 extends a little beyond the bottom longitudinal opening 32 of the cavity, through a distance that depends on the position of the barrier element 18 relative to the bedding plane. When the barrier is raised to its maximum, the extender 34 extends from the cavity so that the useful height of the barrier is at a maximum. On the contrary, when the barrier is in its lowest position, the extender 34 is retracted inside the cavity so that sufficient distance is maintained between the bottom edge of the barrier and the floor.
As can be seen in FIGS. 1 to 3, the deployment bar 26 is engaged in an elongate middle slot 45 of said extender. Each of the two pins 36a, 36b carried by the deployment bar extends on either side thereof, and the corresponding slot 38a, 38b defined in the wall of the extender comprises two slots extending on either side of said middle slot 45. In the example shown in FIGS. 1 to 3, each arm 20a, 20b carries a hinge pin 50a, 50b connected to said deployment bar. This pin passes through a curved slot 52a, 52b formed through the wall of the support 28. The shape and the dimensions of such a slot are determined so that the hinge pin 50a, 50b that passes through it does not encounter the wall of the support. The bottom abutment of the barrier may nevertheless take place against the slots.
In a variant, it is possible to adopt the configuration shown in FIG. 4. The hinge between each arm 20a (or 20b) and the barrier element 18 then comprises a hinge pin 22a (or 22b) that is engaged in said cavity 30. This pin carries an inner support 56 that is fully received inside the cavity. Naturally, the arm 20a (or 20b), the pin 22a (or 22b), and the inner support 56 are secured to one another, the assembly being hinged relative to the frame of the bed. The inner support 56 carries a hinge pin 50a (or 50b) connected to said deployment bar 26. Thus, said deployment bar 26 is hinged between the two pins 50a, 50b carried by the two inner supports 56. In this way, the support wall 28 no longer includes a curved slot as in the above-described embodiment, and this is favorable from a hygiene point of view.
In yet another variant, the top ends of the two arms could be engaged in the cavity.
By analogy with the above, the embodiment shown in FIGS. 8 and 9 comprises a main barrier element 118 having a ramp 118a forming a portion of a deformable parallelogram mechanism 119 hinged to the frame 112 of the bed. This mechanism has two parallel pivot arms 120a, 120b each comprising a hinge 121a, 121b with the frame 112 and a hinge 122a, 122b with the main barrier element. A deployment bar 126 is hinged between the arms 120a, 120b by means of two hinge pins 150a, 150b. In this example, the extender 134 is a hollow structure housing in particular the deployment bar 126 and two vertical uprights 155a, 155b of the main barrier element 118.
The hinges 122a, 122b are situated respectively at the bottom ends of these uprights 155a, 155b. The uprights slide in guides 157a, 157b of the extender 134.
The pins 150a, 150b are also engaged in slots 159a, 159b of the extender 134 to form a sliding connection as in the above example, between said extender 134 and the deployment bar 126. The dynamics of this variant are similar to those of the above embodiment, the ramp 118a of the main barrier element 118 being further away from the top edge of the extender 134 when the system is in its high position (FIG. 8) than when it is in its low position (FIG. 9).

## Claims

1. A side barrier for a bed, the side barrier comprising
a body having a pair of substantially vertical guides and a pair of substantially horizontal slots,
a barrier element including a pair of substantially vertical uprights, each upright of the pair of substantially vertical uprights being received in a respective guide of the pair of vertical guides, the barrier element including a top portion above the body and interconnecting the pair of substantially vertical uprights,
a parallelogram mechanism hinged to a frame of the bed, the parallelogram mechanism comprising two parallel arms, each including a hinge to the frame and a hinge to the barrier element, and
a deployment bar being additionally hinged between the parallel arms, wherein said deployment bar is coupled to the body by a pair of pins that are received in the pair of substantially horizontal slots, wherein the pair of substantially vertical uprights move upwardly relative to the pair of substantially vertical guides as the side barrier is moved from a lowered position to a raised position so that the top portion of the barrier element is moved upwardly relative to the body as the siderail is moved from the lowered position to the raised position.

2. The side barrier of claim 1, wherein the pair of substantially horizontal slots are positioned near a bottom of the body.

3. The side barrier of claim 1, wherein the parallel arms are situated in their entirety inside the body when the side barrier is in the lowered position.

4. The side barrier of claim 3, wherein lower portions of the two parallel arms are outside the body when the side barrier is in the raised position.

5. The side barrier of claim 1, wherein the deployment bar is situated inside the body.

6. The side barrier of claim 1, wherein the pair of substantially vertical guides hang downwardly from a top wall of the body.

7. The side barrier of claim 1, wherein the parallel arms are hinged to bottom ends of the pair of substantially vertical uprights.

8. The side barrier of claim 7, wherein the parallel arms are each L-shaped.

9. The side barrier of claim 8, wherein the pair of pins couple the deployment bar to corner regions of the L-shaped parallel arms.

10. A bed according to claim 1, wherein pair of pins that are received in the substantially horizontal slots also pivotably couple the deployment bar to the parallel arms.

11. A bed comprising
a frame,
a barrier element,
a pair of parallel arms, each of the pair of parallel arms being pivotably coupled to the frame and pivotably coupled to the barrier element,
a deployment bar coupled to each of the pair of parallel arms, and
a body to which the barrier element is slidably attached, the barrier element being constrained to slide along a vertical guide of the body, wherein the body includes a pair of slots and further comprising a pair of pins coupled to the deployment bar and each pin of the pair of pins being received in a respective slot of the body.

12. The bed of claim 11, wherein the pair of slots comprises straight slots.

13. The bed of claim 11, wherein the body has a cavity open at a bottom edge of the body and the parallel arms are hinged to the barrier element inside the cavity.

14. The bed of claim 13, wherein the deployment bar is hinged to the parallel arms inside the cavity.

15. The bed of claim 14, wherein the deployment bar moves horizontally within the cavity of the body as the barrier element is raised and lowered relative to the body.

16. The bed of claim 11, wherein the barrier element has a vertical upright that slides relative to the vertical guide as the parallel arms pivot relative to the frame.

17. The bed of claim 11, wherein the barrier element has a pair of uprights and the parallel arms are hinged to bottom ends of the uprights.

18. The bed of claim 17, wherein the parallel arms are each L-shaped.

19. The bed of claim 18, wherein the deployment bar is coupled to corner regions of the L-shaped parallel arms by the pair of pins.

20. The bed of claim 11, wherein the deployment bar comprises a straight bar.