EP1579835A1 - Bed, in particular hospital bed or nursing bed - Google Patents

Abstract

Each piston-cylinder unit (31-33) used to alter the position of part of the bed (1) is connected to its own hydraulic fluid reservoir via a separate fluid line (41-43) and each reservoir is connected to its own fluid transport device. The maximum volume of fluid which can be supplied by the reservoir is equal to the maximum volume required by the piston-cylinder unit. The fluid line comprises a flexible hydraulic fluid hose. The surface for lying on (11) has an adjustable head part (12) and/or an adjustable foot part (13).

Description

The present invention relates to a bed, in particular Hospital bed or nursing bed, with a bed frame and with a relatively height-adjustable reclining area with adjustable headboard and / or adjustable footrest, each piston-cylinder unit for each adjustment between the relative to each other adjustable Parts of the bed is provided, with each piston-cylinder unit with pressure fluid from a pressure fluid reservoir is loadable and being pressurized fluid from each piston-cylinder unit into the pressure fluid reservoir is traceable.

A bed of the type mentioned is, for example from EP 0 341 358 B1. Next are in this known Bed parallel to each other an electrically driven Pump and a foot pump provided to the Pressurized pressurized fluid and be able to promote. Further, the hydraulic device comprises a here Reservoir for the hydraulic fluid, the esseness is under atmospheric pressure. to Control of the adjustment of the adjustable parts of the Beds electrically operated valves are provided, About the pressurized fluid the individual Piston-cylinder units for extending their Piston rods can be fed. For returning from Pressure fluid from the piston-cylinder units to Reservoirs are provided manually operated valves. Finally, the hydraulic unit includes here still means to bypass the valves to enter in an emergency rapid lowering of the adjustable parts of the bed too enable.

Visible is the hydraulic device and thus the bed very expensive and therefore expensive. Due to the electric pump and due to the presence of high Pressing in the hydraulic fluid must be such a bed also regularly by a certified testing organization technically on his perfect condition and his safety be checked. This requires one considerable organizational and financial effort, because in every hospital or nursing home a large number is used by such beds in use. Next is called considered disadvantageous that in the use of electrical Components on the bed there is a risk that it in case of damage to an electrical insulation to short circuits or electric shocks can occur, for example as a result of incontinence of bedridden patients. moreover is an operation of such a bed only when connected to an electrical mains possible, what a mobile use of the bed more difficult.

From EP 0 349 067 B1 is a hospital bed with a Liftable and lowerable lying surface is known, being used for lifting and lower a foot-operated hydraulic device is used. This bed has a plunger pump and a hydraulic piston-cylinder unit to a Assembled assembly under the bedstead of Bed is arranged and which has a foot pedal of one Operator can be operated. The disadvantage is with this hydraulic device just a lifting and Lowering of the lying surface possible; further adjustment options does not offer this bed. Although the hydraulic Facility offers only one adjustment, it is but relatively complex and thus for the offered limited Function relatively expensive.

A technically simpler construction of a bed with an adjustment is known from DE 38 08 408 C2. Here is the adjustment with a threaded spindle and a mother operated by one Hand crank described. To reduce the manually applied Adjustment force and to reduce the required Number of crank turns for a given Adjustment is here a blocked gas spring or provided an electric servomotor. As a disadvantage is considered in this bed that the gas spring is a component represents a relatively high risk potential, which is also subject to wear. The use of a electric servomotor leads to the above already described specific disadvantages in the use of electrical components on a bed of the aforementioned Art.

EP 0 689 412 B1 discloses an apparatus and a method for supporting a load at adjustable height and especially, but not exclusively, chair-beds Use for carrying patients during a medical Treatment, and a procedure that patients with minimal effort to raise and lower known. This document also relates to a gas spring for Use in such a device. Specifically revealed This font is a device for use in Supporting a load at adjustable height, which is a rest area to carry a load using a Base that communicates with the rest area through a connection connected, which is a setting of the height of the Rest area relieved relative to the base. Further the device comprises a locking device which selectively in a locked state to the position the rest area relative to the base to lock, and in an unlocked state is operable to a height adjustment to facilitate. Furthermore belongs to the Device a gas spring, which is at least actuated, when the locking device unlocked in one Condition is located to a spring force directly or apply indirectly between the base and the rest area. Furthermore, the device has an adjusting device on, regardless of a height adjustment is operable to adjust the spring force so that an upward component of the spring force acting on the Rest area acts, has a value to that effect adjustable, the weight of the rest area around an amount substantially equal to the weight of the To exceed load. In this case, the gas spring comprises a Cylinder that limits a chamber containing a quantity of gas and receives a first piston, which is inside the cylinder is movable in response to the gas pressure. Also included the adjusting means a second piston, in the cylinder is attached and independent of the first Piston is movable so that the gas volume a first Area of the chamber occupied by the first and is limited to the second piston. Furthermore, the adjustment means a pump device which can be actuated is to pressurize a volume of hydraulic fluid put and with a volume of hydraulic fluid communicates a second area of the chamber of the Gas spring chamber occupied, bounded by the second piston is, whereby the pumping device is actuated, To deliver fluid into the second area of the chamber, so that the second piston is moved in one direction, in the gas volume is reduced.

Obviously, this known device is constructive and technically very complicated and does not allow use from simple standard components, thus reducing the manufacturing the device is very complicated and expensive. Furthermore can in this device high pressures in the Pressure fluid and gas in the gas spring occur, what represents an undesirable source of danger and corresponding Safety measures, in particular safety valves, required. These necessary safety devices lead to a further rise in the price of Contraption. In addition, the operation of the device for the operating staff not easy, because the operating staff always make sure that the gas pressure the gas spring always to the current of the device supported load is adjusted. In the case of a bed here can be between a very lightweight and a very heavyweight patient very big differences result. Will the pressure setting of the gas spring not done carefully, it can cause malfunction come the device.

Therefore, for the present invention, the Task to create a bed of the type mentioned, which avoids the stated disadvantages and with the particular with a simple technical construction and easy operation, high reliability and safety be achieved, the several adjustment functions allows, during the regular technical checks are not required by testing agencies and only relatively low investment costs required.

• daß jeder Kolben-Zylinder-Einheit je ein eigener Druckflüssigkeitsvorratsbehälter zugeordnet ist,
• daß jedem zusammengehörenden Paar von Kolben-Zylinder-Einheit und Druckflüssigkeitsvorratsbehälter je eine eigene, diese ständig verbindende, im Betrieb unabsperrbare Druckflüssigkeitsleitung zugeordnet ist,
• daß jede Kolben-Zylinder-Einheit einen einfach wirkenden Zylinder aufweist,
• daß jedem Druckflüssigkeitsvorratsbehälter je eine eigene, rein mechanische, durch eine Bedienungsperson betätigbare, bei Nichtbetätigung selbsthemmende Druckflüssigkeitsfördereinrichtung zugeordnet ist und
• daß das aus jedem Druckflüssigkeitsvorratsbehälter mittels der zugehörigen Druckflüssigkeitsfördereinrichtung heraus förderbare Druckflüssigkeitsvolumen maximal so groß ist wie das von der zugehörigen Kolben-Zylinder-Einheit bei deren Verstellung aufnehmbare Volumen an Druckflüssigkeit.

The solution of this object succeeds according to the invention with a bed of the type initially, which is characterized

• that each piston-cylinder unit is assigned a separate pressure fluid reservoir,
• that each associated pair of piston-cylinder unit and pressure fluid reservoir each have their own, this constantly connecting, unapperrbare in operation hydraulic fluid is assigned,
• that each piston-cylinder unit has a single-acting cylinder,
• that each pressure fluid reservoir each has its own, purely mechanical, operable by an operator, is associated with non-self-locking pressure fluid delivery device and
• in that the pressure fluid volume which can be conveyed from each pressure fluid reservoir by means of the associated pressure fluid delivery device is at most as large as that which can be absorbed by the associated piston-cylinder unit during the adjustment thereof.

With the present invention, a bed is created, its means for the adjustment of the adjustable parts of the bed both technically very simple and special are safe. Adjustment valves and safety valves become advantageous in the bed according to the invention not required. Rather, it is for every adjustable part of the bed ever a functional hydraulic Device provided, each consisting of a piston-cylinder unit, a pressure fluid reservoir, a pressure fluid line and a pressure fluid delivery device consists. The high level of security is achieved in particular by the measure that in each case the hydraulic fluid line during operation is unbabsperrbar and that from each pressure fluid reservoir out of the pumped fluid volume at most as large as that of the associated piston-cylinder unit Recordable volume of pressure fluid. This ensures that the hydraulic fluid is not be put under a high, dangerous pressure can, but only with a relatively low pressure within the hydraulic equipment is used what dangers due to high fluid pressures in principle already excludes. An electrical energy supply is not needed, what the associated risks excludes and easy mobile use of the Beds allowed under full preservation of the adjustment functions. In addition, in the bed according to the invention, the execution the hydraulic device very easy to different Numbers of adjustable bed parts adapted because for every adjustable part of the bed each used an independent hydraulic device becomes. It can be advantageous to the hydraulic Facilities complete or at least for the most part be identical to each other. A simple-looking one Cylinder is sufficient in each case and is the conceivable The simplest cylinder design, the cheapest on the market is available.

Another contribution to achieving low production costs for the bed according to the invention is that in each case preferably the pressure fluid reservoir and the associated pressure fluid delivery device combined to form a hollow cylindrical component are, in its interior to promote the pressure fluid a piston axially displaceable by the operator is. The described embodiment of the pressure fluid reservoir and the associated pressure fluid delivery device gives a very simple and at the same time reliable construction, so that too Here the production costs are kept low. Furthermore Thus, an advantageously compact design is achieved the housing of the parts of the hydraulic Facility simplified at the bed.

In a further embodiment it is provided that the piston guided non-rotatably in the hollow cylindrical member is and that its axial displacement by means of a the threaded engagement of the piston rotatable threaded spindle is feasible. The axial displacement of the Piston is thus generated here by means of a rotary movement, which in a simple way the required Power transmission is achieved with manual operation. The adjustment of the adjustable parts of the bed can thus done with a relatively small amount of force, which is beneficial for the operator. Furthermore becomes the desired self-locking when not in operation achieved without additional components.

It is also proposed that in each case with the threaded spindle a rotary tool is coupled or can be coupled. With a fixed coupling belongs to each threaded spindle own turning tool. With a separable coupling can also a single, loose turning tool with either desired threaded spindle are coupled, so that the Turning tool is needed only once.

Preferably, the rotary tool is a crank, the optional with one of the threaded spindles engageable is. The crank is an easy-to-handle turning tool, its use for the operator no Causes circumstances.

All adjustment movements from a single point on the bed to be able to make another suggests Embodiment that the hollow cylindrical components to an actuating unit combined side by side or one above the other with parallel longitudinal axes on the Bed are attached.

Preference is given to the hollow cylindrical components with approximately horizontally aligned longitudinal axes on the outside one of the end walls of the bed attached. Is appropriate the aforementioned front wall at the foot of the bed lying front wall, as in this area usually enough space for an operator and for the is to be executed by this actuating movements.

To simplify the assembly of the parts of the actuator is further preferred that all hollow cylindrical components by means of a common Holder are attached to the bed.

To make the hydraulic device easy with hydraulic fluid to be able to fill and to disturb the function Air pockets in the hydraulic fluid Avoid equipment or eliminate it if necessary can, is further provided that the hollow cylindrical Components each the highest part of the hydraulic Form device and that each hollow cylindrical Component a Druckflüssigkeitseinfüll- and bleed valve assigned.

To simply lay the hydraulic fluid lines can and relative movements between the parts of the hydraulic device together with the adjustable Easily sharing the bed is convenient every pressure fluid line through a flexible Hydraulic hose formed.

To avoid risk of injury and also from optical Finally, reasons are still preferred that all piston-cylinder units within the bed frame and arranged under the lying surface and with Swivel levers connected to an adjusting lever assembly are.

Figur 1

ein Bett in Draufsicht bei zum größten Teil entfernter Liegefläche,

Figur 2

das Bett aus Figur 1 im Längsschnitt gemäß der Linie A-A in Figur 1,

Figur 3

das Bett aus Figur 1 im Längsschnitt gemäß der Linie B-B in Figur 1,

Figur 4

eine hydraulische Einrichtung aus Druckflüssigkeitsvorratsbehälter, Druckflüssigkeitsfördereinrichtung, Druckflüssigkeitsleitung und Kolben-Zylinder-Einheit als Teilkomponente des Betts aus den Figuren 1 bis 3 und

Figur 5

eine räumlich zusammengefaßt angeordnete Betätigungseinheit für drei verstellbare Teile des Betts, teils im Längsschnitt, teils in Ansicht.

An embodiment of the invention will be explained below with reference to a drawing. The figures of the drawing show:

FIG. 1

a bed in plan view for the most part removed lying surface,

FIG. 2

the bed of Figure 1 in longitudinal section along the line AA in Figure 1,

FIG. 3

the bed of Figure 1 in longitudinal section along the line BB in Figure 1,

FIG. 4

a hydraulic device of pressure fluid reservoir, hydraulic fluid delivery device, hydraulic fluid line and piston-cylinder unit as a component part of the bed of Figures 1 to 3 and

FIG. 5

a spatially combined actuator unit for three adjustable parts of the bed, partly in longitudinal section, partly in view.

FIG. 1 shows a hospital bed 1 in plan view for reasons of clarity a lying surface 11 to on her frame is omitted. The lower, in Figure 1 in the background lying part of the bed 1 forms Bed frame 10, which is essentially the shape of a rectangular Frame has. With the bed frame 10 is the bed 11 and their frames connected, wherein the lying surface 11 adjustable relative to the bed frame 10 in height is. In addition, the lying surface 11 has a adjustable headboard 12 and an adjustable footboard 13th

For lifting and lowering the lying surface 11 relative to the bed frame 10 is a piston-cylinder unit 31, which is located above in Figure 1 within the bed frame 10.

For the adjustment, here a pivoting, of the head part 12 is a second piston-cylinder unit 32, which in 1 below the first piston-cylinder unit 31st is visible. For adjusting the foot part 13 finally serves a third piston-cylinder unit 33, which in FIG 1 is visible below.

Each piston-cylinder unit 31, 32, 33 is above each one own hydraulic fluid line 41, 42, 43 with a Pressure fluid, z. B. hydraulic oil, can be supplied. To this Purpose is on the bed 1, here at the left end wall 14, which forms the foot end of the bed 1, an operating unit 5 arranged. The actuator unit 5 comprises for each piston-cylinder unit 31, 32, 33 respectively a pressurized fluid reservoir and a pressurized fluid conveying device, each with the associated, Unattachable hydraulic fluid during operation 41, 42, 43 is connected. Thus, the hydraulic includes Installation of bed 1 three hydraulically from each other separate and independently functioning and actuatable hydraulic part facilities, each one Part-device for one of the three possible adjustment movements here is being used.

Figure 2 shows the bed 1 of Figure 1 in section according to the Line A-A in Figure 1. Bottom of Figure 2 is the bed frame 10 recognizable, here in a known manner with wheels is provided. Above is the lying area 11. The bed frame 10 and the lying surface 11 are over a first Verstellhebelanordnung 21 hingedly together connected, that upon actuation of the piston-cylinder unit 31, with an extension of their Piston rod is connected, the lever of Verstellhebelanordnung 21 are pivoted so that the bed 11 is raised relative to the bed frame 10. at a retraction of the piston rod of the piston-cylinder unit 31, the lying surface 11 relative to the bed frame 10 lowered. The supply of the first piston-cylinder unit 31 with hydraulic fluid via the associated pressure fluid line 41. This is with the operating unit 5 on the left end wall 14 of the Bed 1 connected.

To adjust the head portion 12 is a second Verstellhebelanordnung 22, with the piston rod of the second piston-cylinder unit 32 is connected. At a Extending the piston rod of this second piston-cylinder unit 32 results in a pivoting of Headboard 12 in the sense of the there drawn movement arrow up. When draining hydraulic fluid from the cylinder of the second piston-cylinder unit 32nd its piston rod moves into the cylinder, whereby the head part 12 is lowered again. The supply the second piston-cylinder unit 32 with hydraulic fluid takes place here via the associated hydraulic fluid line 42, also with the operating unit 5 is connected.

Figure 3 shows the bed 1 of Figure 1 in section according to the Line B-B in Figure 1, here now the third piston-cylinder unit 33 for the adjustment of the foot part 13 of the bed 1 is visible. For adjustment of the foot part 13 serves here a third Verstellhebelanordnung 23, with the piston rod of the third piston-cylinder unit 33rd connected is. When loading the cylinder of the third Piston-cylinder unit 33 with hydraulic fluid is the Piston rod extended out of the cylinder and it gives there is a pivoting of the foot part 13 upwards in the sense of the movement arrow drawn there. At a Draining hydraulic fluid from the cylinder of the third Piston-cylinder unit 33, the foot part 13 under Inserting the piston rod lowered into the cylinder. The piston-cylinder unit 33 is also on its own Hydraulic fluid line 43 with the actuator 5 in connection.

As shown in Figures 1 to 3, all three are piston-cylinder units 31, 32, 33 with single-acting hydraulic Cylinders equipped, indicating the use of low-cost units allowed. This is every piston-cylinder unit 31, 32, 33 from the operating unit 5 off separately operated. So it can be from the operating unit 5 for each individual piston-cylinder unit 31, 32, 33 either pressure fluid to the piston-cylinder unit 31, 32, 33 are guided or deducted from this.

FIG. 4 shows a partial unit of the hydraulic device of the bed 1 of Figures 1 to 3, where left in Figure 4, a part of the actuator unit 5 and right the piston-cylinder unit 31 is visible.

The operating unit 5, here their for the operation the piston-cylinder unit 31 serving part, includes a hollow cylindrical member having a reservoir 51st forms for pressure fluid. At the same time this reservoir is 51 formed as a cylinder 51.1, in which a piston 51.2 guided axially displaceable and sealed is. On its left-facing side is the Piston 51.2 with a threaded spindle 51.3 in threaded engagement, that upon rotation of the threaded spindle 51.3 of Piston 51.2 shifted in the axial direction of the cylinder 51.1 becomes.

To rotate the threaded spindle 51.3 is used here its left end provided crank 60 which operates manually can be.

At the right end of the cylinder 51.1 is an end of the Hydraulic fluid line 41 connected. The other end the hydraulic fluid line 41 is with the associated Piston-cylinder unit 31 connected. The piston-cylinder unit 31 includes a cylinder 31.1 in which a piston 31.2 is guided axially displaceable. The piston 31.2 is with a right out of the cylinder 31.1 led out piston rod 31.3 connected.

At a rotation of the threaded spindle 51.3, which leads to a Displacement of the piston 51.2 in the cylinder 51.1 leads into pressure fluid from the cylinder 51.1 displaced and by the unabsperrbare, so constantly permeable Hydraulic fluid line 41 into the cylinder 31.1 directed. This causes the piston 31.2 with the Piston rod 31.3 relative to the cylinder 31.1 in the sense of there drawn movement arrow to the right, ie in Extension direction, is moved.

As Figure 4 clearly shows, the volume is on Pressure fluid in the cylinder 51.1 at most as large as that from the cylinder 31.1 maximum recordable volume. This is without elaborate safety valves or similar ancillary equipment reliably ensures that in the hydraulic device a high pressure of the hydraulic fluid, that could possibly lead to dangers, can not arise.

When the piston 31.2 with the piston rod 31.3 back in the associated cylinder 31.1 of the piston-cylinder unit 31 is to be retracted, the piston 51.2 in the cylinder 51.1 by opposite rotation of the threaded spindle 51.3 moves to the left according to FIG. hereby is pressure fluid from the cylinder 31.1 of the piston-cylinder unit 31 returned back to the reservoir 51.

To fill the device with hydraulic fluid and the Ventilation as needed is to the right of the reservoir 51 to the hydraulic fluid line 41, a filling and venting valve 71 connected.

The arrangement shown in Figure 4 is except for the first piston-cylinder unit 31 in the same design also for the two other piston-cylinder units 32nd and 33 provided on the bed 1 according to FIGS. 1 to 3.

Finally, FIG. 5 shows the actuating unit 5 partly in longitudinal section, partly in view. In the operating unit 5 are the actuating means for the three piston-cylinder units 31, 32, 33 summarized.

At the top of Figure 5 are the actuating means for the Piston-cylinder unit 33. Below follow the actuating means for the piston-cylinder unit 31 and the Actuating means for the piston-cylinder unit 32nd

Each actuator consists of an integrated Unit 51, 52, 53, each with a reservoir and a conveyor for the hydraulic fluid. The Reservoir 51 to 53 each consist of a Hollow cylinder 51.1, 52.1, 53.1, in each of which a piston 51.2, 52.2, 53.2 is axially displaceable. to axial displacement of each piston 51.2 to 53.2 is used here an associated threaded spindle 51.3, 52.3, 53.3. At the left end of each threaded spindle 51.3 to 53.3 is ever a hexagonal head 61, 62, 63 is provided for coupling with an attachable, manually rotatable crank handle, which is not shown here, serves.

At the far right in FIG. 5, 51.1 to each cylinder 51.1 53.1 a line connection 41.1, 42.1, 43.1 provided at the pressure fluid lines 41, 42, 43 connectable are.

All storage tanks 51 to 53 with their integrated Conveyor are in a common bracket 15th mechanically summarized and not together on this one attached bed attached.

As needed, the operating crank on one of Hexagonal heads 61 to 63 plugged in and it gets through manual rotation of the crank and the respectively coupled with it Threaded spindle 51.3, 52.3 or 53.3 a shift the associated piston 51.2, 52.2 or 53.2 causes. This will either depending on the direction of rotation Pressure fluid from the respective cylinder 51.1, 52.1 or 53.1 about the associated ones not shown here Hydraulic fluid line 41, 42 or 43 of the associated Piston-cylinder unit 31, 32 or 33 supplied or in reversed direction. Leaves accordingly an adjustment of the selected adjustable Part of the bed 1 in one direction or the other cause.

Claims (11)

Bed (1), in particular hospital bed or nursing bed, with a bed frame (10) and with a relative height adjustable lying surface (11) with adjustable head part (12) and / or adjustable foot part (13), wherein for each adjustment depending on a piston-cylinder Unit (31, 32, 33) is provided between the respective relatively adjustable parts of the bed (1), wherein each piston-cylinder unit (31, 32, 33) can be charged with pressurized fluid from a pressurized fluid reservoir and pressurized fluid from each Piston-cylinder unit (31, 32, 33) is traceable to the pressure fluid reservoir,
characterized, that each piston-cylinder unit (31, 32, 33) is assigned a separate pressure fluid reservoir (51.1, 52.1, 53.1), that each associated pair of piston-cylinder unit (31, 32, 33) and pressure fluid reservoir (51.1, 52.1, 53.1) each have their own, this constantly connecting, unsecure in operation hydraulic fluid line (41, 42, 43) is assigned, that each piston-cylinder unit (31, 32, 33) comprises a single-acting cylinder, that each pressure fluid reservoir (51.1, 52.1, 53.1) is assigned its own, purely mechanical, operable by an operator, self-locking inoperative pressure fluid delivery device (51.2, 52.2, 53.2) and that from each pressure fluid reservoir (51.1, 52.1, 53.1) by means of the associated Druckflüssigkeitsfördereinrichtung (51.2, 52.2, 53.2) out of recoverable pressure fluid volume is at most as large as that of the associated piston-cylinder unit (31, 32, 33) during their adjustment Recordable volume of pressure fluid. Bed according to claim 1, characterized in that in each case the pressure fluid reservoir (51.1, 52.1, 53.1) and the associated pressure fluid conveying means (51.2, 52.2, 53.2) are combined to form a hollow cylindrical component (51, 52, 53) in the interior thereof for conveying the Pressure fluid is a piston (51.1, 52.1, 53.1) axially displaceable by the operator. Bed according to Claim 2, characterized in that the piston (51.1, 52.1, 53.1) is guided non-rotatably in the hollow cylindrical component (51, 52, 53) and in that its axial displacement is threadedly engaged with the piston (51.1, 52.1, 53.1) standing rotatable threaded spindle (51.3, 52.3, 53.3) is effected. Bed according to one of claims 1 to 3, characterized in that in each case with the threaded spindle (51.3, 52.3, 53.3), a rotary tool (60) is coupled or can be coupled. Bed according to Claim 4, characterized in that the rotary tool (60) is a crank which can be selectively brought into engagement with one of the threaded spindles (51.3, 52.3, 53.3). Bed according to one of claims 2 to 5, characterized in that the hollow cylindrical components (51, 52, 53) to an actuating unit (5) are mounted side by side or one above the other with parallel longitudinal axes on the bed (1). Bed according to claim 6, characterized in that the hollow-cylindrical components (51, 52, 53) are mounted outside with approximately horizontally oriented longitudinal axes on one of the end walls (14) of the bed (1). Bed according to claim 6 or 7, characterized in that all the hollow cylindrical components (51, 52, 53) are attached to the bed (1) by means of a common support (15). Bed according to one of the preceding claims, characterized in that the hollow cylindrical components (51, 52, 53) each form the highest part of the hydraulic device and that each hollow cylindrical member (51, 52, 53) associated with a Druckflüssigkeitseinfüll- and vent valve (71) is. Bed according to one of the preceding claims, characterized in that each hydraulic fluid line (41, 42, 43) is formed by a flexible hydraulic hose. Bed according to one of the preceding claims, characterized in that all the piston-cylinder units (31, 32, 33) are arranged inside the bed frame (10) and below the lying surface (11) and with pivot levers of an adjusting lever arrangement (21, 22, 23). are connected.

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