EP2210577A1 - Mattress suport - Google Patents

Abstract

The bed (1) has a spring-mattress (3) adjustable with respect to a frame (2). An inclining device (25) of the mattress has a connecting rod assembly (26) comprising a connecting rod (30) mounted between the frame and the mattress. The rod has a rotating point sliding on the mattress in a longitudinal direction, and another rotating point (32) fixed relative to the frame. The assembly has another connecting rod (40) mounted between the mattress and the former rod. The latter rod has a rotating point (41) fixed relative to the mattress, and another rotating point (42) fixed on the former rod.

Description

The invention relates to the field of medical beds. More specifically, the invention relates to medical beds incorporating a proclive function.

The so-called proclive beds have an inclined bed base, so that the head of a patient lying on the bed base is above his legs.

The proclive station notably makes it possible to control the circulation of physiological fluids of a patient. Indeed, the patient can be in a state requiring the flow of pus, this flow being hampered by a totally horizontal station. Regurgitation can also be reduced by the proclive station.

In addition, certain surgical procedures can only be performed in a proclive station.

The proclive station also increases the comfort of a patient, especially when the bed further comprises an articulated bed base, to put the bed in a position close to that of a chair.

In order that the patient does not slide on the bed base, holding devices can be added, such as patient fixtures to the bed frame.

Most medical beds further include a height adjustment system, secured between a base frame and the bed frame. This system is generally in the form of telescopic columns placed at the head and footboard, or also in the form of a pair of braces, the variation of angle allows to vary the height of the bed base.

Thus, the proclive station can be obtained using the height adjustment system, to create a height differential between the foot and the head of the bed.

This differential is obtained simply with the telescopic columns, by regulating differently the columns located at the head and foot of the sommier. However, in the case of braces, it is necessary to make profound changes.

The document FR 2 419 068 shows an example of such a bed in which the bed base is pivotally mounted on an upper end of two levers, which have their lower end pivotally mounted on the base of the bed. The base comprises a support, which is respectively connected to each lever by means of a piston. A connecting rod placed between each lever and the base makes it possible to support each lever. Thus, by independently operating the pistons, the levers can create a height differential on the bed base.

Although such a system is able to perform a proclive function, the height adjustment system is too complex to easily adapt to a standard type of bed.

The needs of patients are becoming more diverse, and medical beds must be able to adapt to each patient. That is why, it develops the need to provide beds whose different functions are independent of each other, so as to offer a patient a custom bed.

More specifically, the function proclive a bed must be integrated in the bed or not, in the same way as other functions.

The document GB 2,247,834 proposes a bed with braces, in which a connection of each pair of braces on the bed base is modified. Thus, a bar of each pair of braces is mounted on the pivoting base in one direction and sliding in a perpendicular direction. The other bar is connected to the bed base via a connecting rod. A jack placed between the bed and the connecting rod causes the actuation of the connecting rod and the raising of the bed base, so that the bed base is tilted.

However, such a device has several disadvantages.

In particular, when the piston pushes on the connecting rod to lift the bed frame, the circular arc described by the fixing on the bed frame causes the movement of the bed to the head of the bed. However, most beds have their head placed near a wall, so this move can be embarrassing.

In addition, the desired maximum inclination is generally of the order of 10 to 15 °, so that the length of the connecting rod, considering a distance between the upper end of the bars of a cross of the order of meter, should be approximately 20 to 30 cm. The maximum inclination then corresponds to a vertical position of the connecting rod. We then obtain a displacement of the bed base of the order of 20 to 30 cm, which is not negligible. Indeed, such a displacement can cause the collision between the head of the bed and a wall located nearby.

In addition, the beds are generally provided with panels fixed at the head and foot of the bed base. These panels protrude under the bed base, so that the inclination of the bed base associated with the displacement causes the passage of the panel at the foot of bed in the space under the bed base when it is horizontal. However, this space is often used to attach other elements such as equipment and electrical components for the operation of the bed, so that when the bed base tilts and moves, the footboard of bed may come to interfere with these elements.

The present invention aims in particular to provide a solution to the various problems mentioned above.

A first object of the invention is to provide a bed base independent of the rest of the bed, which comprises a proclive device, so that it can be mounted on various types of bed and provide a proclive function.

A second object of the invention is to provide a bed base with a proclive device, whose displacement is decreased.

A third object of the invention is to provide a bed base with a proclive device whose movement is made to the footboard.

• la figure 1 est une vue latérale suivant un longeron d'un lit comprenant un dispositif proclive, dans laquelle le sommier n'est pas incliné ni surélevé ;
• la figure 2 est une vue similaire à celle de la figure 1 dans laquelle le sommier est incliné ;
• la figure 3 est une vue similaire à celle de la figure 2 dans laquelle le sommier est surélevé ;
• la figure 4 est une vue en perspective du lit de la figure 3 ;
• la figure 5 est une vue en perspective de cadre du lit comportant des croisillons ;
• la figure 6 est une vue latérale de la figure 5 suivant un longeron ;
• la figure 7 est une vue latérale suivant un longeron du sommier avec le dispositif proclive, le sommier n'étant pas incliné ;
• la figure 8 est une vue similaire à celle de la figure 7 dans laquelle le sommier est incliné ;
• la figure 9 est une vue en perspective de dessous du sommier de la figure 8.

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 side view along a spar of a bed comprising a proclive device, in which the bed is not inclined or elevated;
• the figure 2 is a view similar to that of the figure 1 in which the bed base is inclined;
• the figure 3 is a view similar to that of the figure 2 in which the bed frame is raised;
• the figure 4 is a perspective view of the bed of the figure 3 ;
• the figure 5 is a perspective view of bed frame with braces;
• the figure 6 is a side view of the figure 5 following a spar;
• the figure 7 is a lateral view along a spar of the bed with the proclive device, the bed base not being inclined;
• the figure 8 is a view similar to that of the figure 7 in which the bed base is inclined;
• the figure 9 is a perspective view from below of the bed base of the figure 8 .

On the Figures 1 to 4 is represented a bed 1, such as a medical bed that can be found in hospitals, clinics, specialized houses or at home that require home care.

The bed 1 comprises a frame 2, a bed base 3 and a height adjustment system 4 mounted between the frame 2 and the bed base 3.

The frame 2 comprises a lower frame 5 formed by two longitudinal members 6 connected by two crosspieces 7. The frame 2 rests on the ground for example by means of feet 8. Advantageously, rollers (not shown), typically four in number, are fixed on the lower frame, to facilitate the movement of the bed 1.

The system 4 for adjusting the height is preferably a crossbar system 9.

Two pairs of symmetrical braces 9 are mounted on the lower frame. Each spider 9 comprises two bars 10, 11, pivotally mounted on one another with respect to an axis parallel to the crosspieces 7. The two bars 10, 11 are pivotally mounted at their ends 12, 13 below, on the frame 5, about axes parallel to the crosspieces 7. Furthermore, one of the bars is also slidably mounted on the frame 5, along a spar 6. For this purpose, a channel 14 is for example fixed to a 6, and a ball bearing 15 mounted on the bar 10 and inserted into the channel 14 ensures the double articulation of the bar 10. The two bars 10, 11 of a cross 9 are then called conjugate, that is to say articulate one on the other, the movement of one depending on the movement of the other.

A crossbar 16 junction is mounted between two bars 11 respectively two braces 9, so that the braces 9 are operated simultaneously and symmetrically. The upper ends of the bars 10, 11 are further coplanar in a horizontal plane substantially parallel to the plane defined by the lower frame.

An actuating system 17, such as a jack, is mounted between the lower frame and the connecting bar 16.

It will be understood that then the actuating system 17 makes it possible to vary the angle between the bars 10, 11 of each spider 9 so that the height of the upper end portions 18, 19 of the bars 10, 11 of the crosspieces 9, 9 that is, their distance from frame 5 varies.

Optionally, the frame can integrate a so-called household function. For this purpose, the rollers are fixed on vertically-guided rods in the lower frame. Thus, from a position in which the lower frame rests on the ground via the feet 8, bringing for example the upper ends of the bars 10, 11 of the braces 9 resting on the rods of the rollers, the actuator of the system 17 for operating the braces 9 pulls on the lower frame 5 and lifts it with respect to the rollers.

A wheel brake system can also be installed on the frame.

The bed base 3 comprises an outer rigid frame 20, formed by two longitudinal members 21 and two crosspieces 22, inside which are fixed two uprights 23 parallel to the longitudinal members 21. A sleeping surface fixed on the outer frame 20 comprises for example two frames articulated on the outer frame 20 so as to allow adjustment of the inclination of the bust and legs.

The bed frame 3 further comprises a device 25 proclive. The proclive device comprises two identical sets of connecting rods 26, the axes of which are parallel to the sleepers of the bed, each set 26 being fixed respectively to an upright 23 of the outer frame. The assemblies 26 are symmetrically fixed to each other with respect to a median plane of the outer frame, under the bed base 3 in a region called headboard, opposite longitudinally to a region called foot.

A first link 30 comprises three points 31, 32, 33 of rotation, non-aligned. The rod 30 is pivotally mounted on a first point 31 of rotation on a slider 27 sliding along an upright 23. The distance, noted b ₁ , between this first point 31 of rotation and a second 32 is considered as the distance between of the first connecting rod 30.

A second connecting rod 40 is pivotally mounted on the upright 23 via a first point 41 of rotation, and secondly on the third point 33 of rotation of the first rod 30 via a second point 42 of rotation. The distance between the two points 41, 42, denoted b ₂ , of the second connecting rod 40 is less than b ₁ .

The distance between the second and third points 32, 33 of rotation of the first link 30 is denoted b ' ₁ and is less than b ₁ .

A crossbar 28 junction is fixed between the second rods 40 of the two sets 26 of the device 25 proclive. The point 43 for attaching this connecting bar 28 to the second connecting rod 40 is preferably not aligned with the two points 41, 42 of rotations - on the first connecting rod and on the bed base - of the second connecting rod. An actuating system 29, such as a jack, is mounted between the connecting bar 28 and the outer frame of the bed base 3.

The proclive device operates as follows.

The bed base 3 is first pivotally mounted about axes parallel to the cross members 22 on the upper portions 18, 19 of the upper bars 10, 11 of the crosspieces 9 of the system 4 for adjusting the height of the bed base 3. The bed base 3 is mounted so that its struts 22 and longitudinal members 21 respectively are parallel to the cross members 7 and longitudinal members 6 of the lower frame 5.

The bar 11 of a spider 9, non-slippery on the lower frame 5, is slidably mounted on the bed base 3, for example in a gutter 44 fixed to an upright 23 of the bed base 3. The point 45 of rotation of the bar 11 on the bed base 3 is thus substantially aligned with the points 31, 41 of rotation of the two connecting rods 30, 31 on the bed base 3. The bar 10 conjugate is fixed to the first rod 30 of a set 26 of the device 25 proclive on the second point 32 of rotation of the connecting rod 30. For a height of the bed base 3 given, the bed frame 3 is fixed between two parallel axes, passing respectively by the rotation points 32, 45 on the bed frame bars 10, 11 of the braces 9, and separated by a distance c.

The outer frame 20 of the bed base 3 can then take two positions.

In a first non-inclined position, the system 29 for actuating the device 25 is inactive, and the outer frame 20 is in a substantially horizontal plane, parallel to the plane of the lower frame 5. The angle then formed between the two points 31, 32 of the distance between the first connecting rod 30 and the horizontal plane is denoted β ₀ ; the angle formed between the two points 41, 42 of the distance between the second connecting rod 40 and the horizontal plane is denoted γ _0.

In practice, β ₀ and γ ₀ are not zero, for example the first connecting rod 40 is mounted in the extension of the cross bar 10 when the distance from the bed base 3 to the lower frame 2 is minimal. This embodiment allows in particular to maintain a free space directly under the bed base 3, accessible even when the bed base is not inclined, for example to install other equipment.

Moreover, the first point 31 of rotation of the first link 30 is the point of rotation of the connecting rod closest to the leading end of the beam 3.

Then the actuating system 29 operates in compression to exert a transverse force on the connecting bar 28 of the device 25 proclive, so that the angle between the two connecting rods 30, 40 of the sets 26 varies, and more precisely so that this angle closes.

The action of the actuating system 29 thus causes the two rods 30, 40 to move.

Thus, the first link 30 slides along the upright 23 through the slider 27, and its point 31 of rotation on the bed base 3 describes a circular arc of angle β ₁ with the horizontal plane greater than β ₀ , so that the head of the outer frame 20 of the bed frame 3 rises.

Together, the portion of the outer frame 20 located at the foot of the bed pivots about the point 45 of rotation of the bar 11 of the spider 9 mounted on the bed base 3 and passes below this point 45 of rotation, the bar 11 of the cross-member 9 sliding in the gutter 44.

The second connecting rod 40, connected to the bed base by the first point 41 of fixed rotation, holds the outer frame 20 of the bed frame 3 and prevents it from sliding completely on the slider 27 and the trough 44, under the effect of gravity.

When the first connecting rod 30 forms the angle β ₁ , the angle γ ₁ between the two points 41, 42 of the distance between the second link 40 and the horizontal plane is greater than γ ₀

The bed base 3 is then found in a second inclined position in which it forms an angle α with the horizontal plane.

The inclination is then given by the following formula: $$\tan \alpha =\frac{h}{\mathrm{vs}}\mathrm{with}h=\frac{b_1\sin {\beta }_1}{1+\frac{b_1}{\mathrm{vs}}\cos {\beta }_1}$$

The inclination α of the bed base 3 is therefore greater when β ₁ is large and this angle α is maximum when β ₁ is equal to 90 °, that is to say when the first connecting rod 30 is vertical, of so that h = b ₁ .

The length b ₁ of the first link 30 is chosen, for example, as a function of the inclination α of the desired maximum bed base 3 for forces on the cylinder of the actuating system 29, and therefore for a given angle β ₁ , maximum.

The length b ₁ of the first connecting rod 30 must also advantageously allow the installation of a jack for the actuation of the device 25 with a sufficient maximum stroke to obtain the inclination α of the desired bed base, and which remains sufficiently compact for allow other elements under the bed base 3.

By operating the operating system 29 in a reverse mode, the outer frame of the bed frame 3 returns to the non-inclined position.

Thus, by implementing the system 29 for actuating the device 25 proclive, the inclination of the outer frame 20 of the bed frame 3 can be adjusted, so as to raised the head of the bed base 3 relative to the foot.

As described, each link 30, 40 comprises a total of three points 31, 32, 33 and 41, 42, 43 of rotation, which are not aligned, in order to meet congestion and mounting requirements. Therefore, it is possible that the points 31, 32, 33 and 41, 42, 43 of rotation on each link 30, 40 are aligned without changing the operating principle of the device 25.

Thanks to the device 25 proclive thus achieved, the sliding, noted d, the bed base 3, when in the inclined position, in the horizontal plane occurs towards the base of the bed base 3, and is further diminished.

This sliding corresponds to the horizontal displacement of the link 41 of the second connecting rod 40 on the bed base 3. Thus, assuming that the points 31, 32, 33 and 41, 42, 43 of rotations on each connecting rod 30, 40 are aligned, the slip d can be expressed with the following formula: $$d=b_1^{\text{'}}\left(\cos {\beta }_0-\cos {\beta }_1\right)-{\mathrm{<figure-callout\; id="2"\; label="b"\; filenames="imgf0001.png"\; state="\{\{state\}\}">b</figure-callout>}}_2\left(\cos {\gamma }_0-\cos {\gamma }_1\right)$$

Compared to the prior art, the displacement of the bed base 3 depends indirectly on the total length b ₁ of the first connecting rod 30, by the influence on the angle β ₁ of the first connecting rod 30.

The influence on the sliding d of the first connecting rod 30 is represented by the term b ₁ '(cosβ ₀ -cosβ ₁ ). Due to the position of the first point 31 of rotation of the first link 30, this influence results in a sliding towards the foot of the bed 1. This displacement is compensated thanks to the second link 40, whose influence on the displacement is represented by the term b ₂ (cos γ ₀ - cos γ ₁ ), which models a displacement towards the head of the bed 1. Consequently, the value of the sliding d is advantageously reduced thanks to the presence of the second connecting rod.

In practice, for a maximum angle α of 12 ° to 13 °, is measured with the first connecting rod 30 of a length of about 30 cm, a displacement less than 7 cm, so that the bed 1 can be at near a wall.

In addition, it is more rare to place the footboard 1 against a wall rather than the head of the bed, so that the sliding is advantageously implemented towards the base of the bed.

The bed frame 3 thus made with the device 25 proclive can be mounted on various types of frame 2, independently of the functions of the latter.

In addition, the bed base 3 can be delivered in a compact form, by bringing the connecting rods 30, 40 of the device 25 as close as possible to the frame 20.

Claims (8)

Bed (1) comprising a frame (2) and a bed (3), the bed (3) being tiltable relative to the frame (2) about a transverse axis on a point (45) said inclination, said point (45) inclination relative to the frame (2) and sliding on the bed (3) in a longitudinal direction of the bed (3), the bed (1) further comprising a device (25) proclive comprising a set (26) of two connecting rods (30, 40) pivoting about transverse axes: - a first connecting rod (30) mounted between the frame (2) and the bed (3), and having a first point (31) of sliding rotation on the bed base (3) in the longitudinal direction, and a second point (32) fixed rotation relative to the frame (2); a second connecting rod (40) mounted between the bed (3) and the first connecting rod (30), comprising a first point (41) of fixed rotation relative to the bed (3) and a second point (42) of fixed rotation on the first connecting rod (30). Bed according to claim 1 wherein the device (25) proclive comprises two sets (26) of rods (30, 40) placed between the bed (3) and the frame (2), the two sets (26) being symmetrical the one to the other with respect to a median longitudinal plane of the bed base (3). Bed according to claim 1 or 2 comprising a system (4) for adjusting the height of the bed base (3) relative to the frame (2). Bed according to claim 3, wherein the height adjustment system (4) comprises two pairs of braces (9), each pair comprising two bars (10, 11) conjugate mounted on the frame (2), a bar (11). ) fixed on the point (45) of inclination, the second bar (10) being fixed on the second point (32) of rotation of the first link (30). Bed according to one of claims 1 to 4, wherein the first point (41) of rotation of the second connecting rod (40) is placed between the point (45) of inclination and the first point (31) of rotation of the first connecting rod (30). Bed according to one of claims 1 to 5, wherein the device (25) proclive comprises an actuating system (29) , such as a jack, mounted between the second connecting rod (40) and the bed (3). Bed according to one of claims 1 to 6, wherein the first connecting rod (30) is assembled on the bed base (3) by means of a slider (27) sliding longitudinally on the bed base. Bed according to one of claims 1 to 7, wherein the bed frame comprises a gutter (44) extending longitudinally and in which slides the point (45) of inclination.

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