EP0541981A1 - Bed - Google Patents

Abstract

Bed having a mattress frame (2) whose height can be adjusted and which is held so that its height can be adjusted on the head and foot sides on a mobile basic frame (1) with pairs of angle levers (30L*, 30K*; 31L*, 31K*) on which electrically driveable spindle gear motors (50, 57) engage. The mattress frame (2) can be brought by key-shaped control means (T1, T2, T31, T41, ST) into a raised position on the head or foot side in each case independently of any height adjustment. The pairs of work arms (30L*, 31L*) of the angle levers (30*, 31*) project beyond the transverse bars (10, 11) of the basic frame (1) on the end side. Temporary operation independent of the mains supply is possible with batteries. <IMAGE>

Description

The invention relates to a bed with a height-adjustable mattress frame and a base frame, on the head side and foot side in each case pivotally connected by a pivot axis paired lever, on the load arms upward pairs of supports are articulated, one of which is firmly connected to the mattress frame and the other is pivotably articulated to the latter, and with the force arms of which a motor-driven spindle drive connected to the base frame is coupled in terms of drive, the force arms of which are always directed downward from their pivot axis in their pivoting regions.

Such a bed is known from DE 39 28 072 C 1.

It is an object of the invention to improve such a bed, which enables a parallel height adjustment in a large adjustment range by motor, in such a way that it can be raised and lowered in a manner that is easy to operate both on the head side and on the foot side.

The solution is that the second angle lever can be pivoted independently of the first angle lever by means of a second motor-driven spindle drive, so that the mattress frame rises towards the head or foot on the side depending on the pivoting position of the angle lever is inclined, and can also be pivoted together with the second angle lever, as a result of which the mattress frame, approximately maintaining its respective horizontal or inclined position, is vertically adjustable.

Advantageous refinements are specified in the subclaims.

It is intended to use relatively simple and inexpensive electromotive spindle drives.

In a first embodiment, the further spindle motor is arranged in a coupling rod between the angular gears. If this is actuated, it also lifts one side of the mattress. A lowering of this side under the other end of the mattress is achieved, on the other hand, in that manually operable locking stops form a limit for lowering one side when these locking stops have been brought into a locking position.

This locking device is easily accessible on the load arms of the angle lever, where they can interact with counter bearings on the frame and form a stable support.

In a further embodiment, the two pairs of angle levers are arranged on the base frame, each with an associated spindle drive, preferably in mirror image of the central transverse plane. Their coupling is provided by an electrical control which, by pressing different buttons of a contact arrangement, either lifts on both sides, lifts on both sides, or lifts or lowers on one side on the head or foot side.

When the bed is designed, the load arms are the Angle lever arranged within the mobile base frame, which results in a support base on the mattress frame that is shorter by at least one load arm length, with a relatively large base frame length, whereby the mattress frame projects at least one end region relatively far beyond the pair of supports and therefore high support and bending moments on the load-bearing parts, Joints and motors are exercised, which requires a correspondingly massive execution of these parts. An advantageous further development provides a high stability with a lighter design and a small base frame in that the two pivot axes of the angle levers are mounted so close to the ends of the base frame, the power arms still have sufficient freedom of pivoting and that at least one of the pairs of load arms angled so as to project over the base frame in its lower pivot position is designed.

In a first embodiment of the development, the two pairs of angle levers are each arranged on the base frame, each with an associated spindle drive, preferably in mirror image of the central transverse plane. The coupling of the drives for parallel lifting and lowering is provided by an electrical control system, which, by pressing different buttons on a contact arrangement, provides either lifting on both sides, lowering on both sides, or lifting or lowering on one side at the top or bottom of the mattress frame.

In a further embodiment of the development, the two pairs of angle levers are arranged in the same direction at the ends of the base frame, only one pair of angle levers protruding beyond the base frame and the other lying inside. This arrangement provides a parallel movement of the angle lever and supports when lifting and lowering the Mattress frame.

Fig. 1

zeigt eine Seitenansicht der ersten Ausführung;

Fig. 2

zeigt eine Aufsicht auf eine erste Ausführung;

Fig. 3

zeigt eine zweite Ausführung im Längsschnitt und eine Steuervorrichtung schematisch;

Fig. 4

zeigt eine Variante zu Fig. 3;

Fig. 5

zeigt eine Aufsicht auf eine erste Ausführung;

Fig. 6

zeigt einen Längsschnitt einer ersten Ausführung zu Fig. 5 mit einer Steuervorrichtung schematisch;

Fig. 7

zeigt eine zweite Ausführung zu Fig. 5 im Längsschnitt und eine Steuervorrichtung schematisch.

The preferred embodiments are shown with reference to Figures 1 to 7.

Fig. 1

shows a side view of the first embodiment;

Fig. 2

shows a plan view of a first embodiment;

Fig. 3

shows a second embodiment in longitudinal section and a control device schematically;

Fig. 4

shows a variant of Fig. 3;

Fig. 5

shows a plan view of a first embodiment;

Fig. 6

shows a longitudinal section of a first embodiment of Figure 5 with a control device schematically.

Fig. 7

shows a second embodiment of FIG. 5 in longitudinal section and a control device schematically.

Fig. 1 shows a side view of a bed with an i. a. mobile base frame (1) and a height-adjustable mattress frame (2). On this corner pairs of downward supports (20, 21) are fastened, one of which is pivotable. Load arms (30L, 31L) of pairs of angle levers (30, 31) are articulated on the supports (20, 21) and are mounted on transverse pivot axes (30S, 31S) on the base frame (1). The power arms (30K '', 31K '') of the angle lever are offset by approximately 90 ° to the associated load arms (30L '', 31L ''), always pointing downwards.

Different actuation positions of the drives are shown. The strongly drawn representation of the mattress frame (2) and the load arms (30L, 31L) shows the approximately highest position of the same. The reference signs of the Components in the three positions are either without, with a single quote or with two.

In the position of the mattress frame (2 ') shown in dashed lines, it is lowered on one side and raised on the other. The differences in the distances between the load-arm ends are compensated by the articulated mounting of the pair of supports (21 ') on the mattress frame (2').

The dash-dotted position of the mattress frame (2 '') is reached when it is lowered, in which the manually operated locking stops (70) are supported with a locking bolt (72) on counter-locking mechanisms (71) on the base frame (1) and the power arm (31K '' ) of the associated angle lever moves with its coupling bolt (33) in a freewheel cutout (42) of the coupling rod (4).

The force arms (30K '', 31K '') are shown in the associated positions.

Fig. 2 shows a plan view of the first embodiment of the bed with the mattress frame removed.

The pivot axes (30S, 31S) of the angle levers are mounted in the base frame (1). The load arm pairs (30L, 31L) on which the mattress frame supports (20, 21) are articulated are attached to these on the outside. The first spindle drive (50, 51) is articulated on the inside on the base frame (1) on the one hand and on the one power arm (30K). The connecting rod (4 ') of the power arms (30K, 31K) contains a second spindle drive (55, 56). Stops (71) are shown on the base frame (1), which cooperate with detent stops (72) on the load arms (31L), which can be adjusted with an actuating button (70).

This arrangement according to FIGS. 1 and 2 has the advantage that the coupling rod (4 ') can be easily replaced by one without a spindle drive if only one-sided inclination adjustment of the mattress frame (2) is required.

Fig. 3 shows schematically a further embodiment in which the angle levers (30, 31) and the associated drives (50, 51; 57, 58) are arranged mechanically independently of one another. These spindle drives are articulated on the base frame (1).

The motors (50, 57) of the spindle drives are each connected via a button (T3, T4) to a normally closed contact (R3, R4), so that when one of them is actuated, only one of the drives is to be controlled and thus the inclination the mattress frame (2) can be adjusted.

Furthermore, buttons (T1, T2) are provided, each containing a pair of changeover contacts (U1, U1 '; U2, U2') with which the drives can be actuated forwards or backwards, with the changeover switches (U1, U1 '; U2, U2 ') via break contacts prevents a short circuit when the pushbuttons (T1, T2) are actuated in error at the same time.

Instead of arranging the switches directly in the buttons, they can also be located on a correspondingly controlled relay.

The control device (ST) can also be configured in an equivalent manner in other contact arrangements, as shown, for example, in FIG. 4. The use of work contacts (A2, A2 ') on the second button (T2) provides the same function, but less security against Malfunction when the contacts bounce while pressing the buttons (T1, T2) that serve the opposite function. In this illustration, the angle levers (30, 31) and the motors (50, 57) are arranged symmetrically to the central transverse plane. The angle levers (30, 31) are directed so that the spindle drives (50, 51; 57, 58) are always under tension. In such a spindle design, which is designed for a preferred printing operation of the spindle, the angle levers are arranged in reverse.

Figure 5 shows a top view of the first embodiment of the bed with the mattress frame removed. At this corner pairs of downward supports (20, 21) are fastened in the corner areas, one of which is pivotally attached to the mattress frame. Load arms (30L *, 31L) of pairs of angle levers (30, 31) are articulated on the supports (20, 21) and are mounted on transverse pivot axes (30S, 31S) on the base frame (1). The power arms (30K *, 31K) of the angle levers are offset by approximately 90 ° to the associated load arms (30L *, 31L), always pointing downwards.

The pivot axes (30S, 31S) of the angle levers (30 *, 31) are mounted in the base frame (1). The load arm pairs (30L *, 31L) on which the mattress frame supports (20, 21) are articulated are attached to these laterally. On the inside, the first spindle drive (50, 51) is articulated on the one hand on the base frame (1) and on one power arm (30K *), and on the other power arm (31K) is articulated on the second spindle drive (57, 56), which is connected to the base frame ( 1) is articulated on the other hand.

The innovation is that the load arms (30L *) of the a pair of load arms (30L *) extend over the end cross member (10) of the mobile base frame (1).

Fig. 6 shows schematically a longitudinal section of the first embodiment. The angle levers and the associated drives (50, 51; 57, 56) are arranged mechanically independently of one another. These spindle drives are articulated on the base frame (1). To compensate for the differences in the distances between the load arm ends when the mattress frame (2) is inclined, the pair of supports (21) is articulated on the mattress frame (2).

The motors (50, 57) of the spindle drives are each connected via a button (T3, T4) to a normally closed contact (R3, R4), so that when one of them is actuated, only one of the drives is to be controlled and thus the inclination the mattress frame (2) can be adjusted.

Furthermore, buttons (T1, T2) are provided, each containing a pair of changeover contacts (U1, U1 *; U2, U2 *), with which the drives can be actuated forwards or backwards, with the changeover switches (U1, U1 *; U2, U2 *) via break contacts prevents a short circuit when the pushbuttons (T1, T2) are actuated by mistake.

Instead of arranging the changeover switches directly in the push buttons, these locking contacts can also be located on a correspondingly controlled relay or in an electronic logic circuit, which is technically equivalent.

The pair of load levers (30L *) protrudes in an angled shape from the end cross member (10) of the base frame (1). In the lower position of the mattress frame (2) shown the load arm legs (L1, L2) are placed horizontally or vertically. The articulation of the supports (20) is lower in the lower position than the cross strut (10).

The control device (ST) can also be configured in other contact arrangements, as shown for example in FIG. 7. The use of working contacts (A2, A2 *) on the second button (T2) in conjunction with the diode pairs (D) provides the function of lifting or lowering by simultaneously energizing both spindle motors (50, 57). For the sake of clarity, the limit switch arrangements and tilt limit switches of the mattress frame that are usually connected in series with the spindle motors (50, 57) are not shown.

The control device (ST) is equipped with an accumulator (B), which is to be fed from the mains via a charging power supply (NT). Thus, operation without a mains supply is advantageously possible for several hours of engine running time, which is particularly advantageous in the case of sick beds that are frequently moved to treat the patient and are on standby.

Furthermore, the buttons (T31, T41) can be actuated individually or jointly to control one or the other lifting drive (50, 57), independently of the lifting and lowering buttons (T1, T2), which are locked against one another via a normally closed contact chain.

In Fig. 7, the angle lever (30 *, 31 *) and the motors (50, 57) are arranged symmetrically to the diagonal plane of the base frame (1). The angle levers (30 *, 31 *) are directed so that the spindle drives (50, 51; 57, 56) are always under pressure. With such a spindle arrangement, the spindles are designed for this printing operation.

At both ends of the base frame (1), the load levers (30L *, 31L *) mounted there are angled so that they protrude at the end over the cross bars (10, 11) and, in the lower mattress frame position shown, are lower than the cross bars (10, 11) of the base frame (1) with the articulations of the supports (20 *, 21 *). This results in a very short construction of the base frame (1) with widely spaced mattress frame supports (20 *, 21 *). Preferably, the pivotably articulated mattress frame support (21 *) in the lower mattress frame position, which is shown, is inclined towards the end of the frame (2), so that when the drive (57) of the other frame end is actuated, a lateral evasive movement of the frame is possible is, and the support (21 *) does not strike the cross bar (11).

The circuit arrangement described can also be used advantageously with the beds according to the main application.

Claims (14)

Lying bed with a height-adjustable mattress frame (2) and a base frame (1) on which angle levers (30, 31), which are connected to each other in pairs on the head and foot sides by a swivel axis (30S, 31S), are pivotably mounted, on the load arms (30L, 31L) upward pairs of supports (20, 21) are articulated, one of which is fixedly connected to the mattress frame (2) and the other is pivotably articulated thereon, and with the force arms (30K, 31K) of which one is connected to the base frame (1) Connected motor-driven spindle drive (50, 51) is coupled in terms of drive, the force arms (30K, 31K) of which are always directed downward in their pivoting areas from their pivot axis (30S, 31S), characterized in that the second angle lever (31) is actuated by a second motorized spindle drive (55, 56; 57, 58) can be pivoted independently of the first angle lever (30), so that the mattress frame (2) depending on the pivoting position of the angle lever ( 30, 31) is inclined towards the head or foot side, and can also be pivoted together with the second angle lever (30), as a result of which the mattress frame (2), approximately maintaining its respective horizontal or inclined position, is vertically adjustable. Lying bed according to claim 1, characterized in that the first spindle drive (50) on the power arm (30K) directly articulated and in a coupling rod (4 ') between the force arms (30K', 31K ') the second spindle drive (55, 56) is arranged and with a limited freewheel cutout (42') on the hinge and coupling bolts (33) of the second power arm (31K) is coupled. Lying bed according to claim 2, characterized in that the pair of load arms (31L), which is actuated via the second spindle drive (55, 56), each have a manually operable latchable stop (72), which with an opposing stop (71) on the frame side in an actuated position the downward pivoting of the pair of load arms (31L) is limited when the first spindle drive (50) is actuated in a lowering manner, the coupling rod (4 ') moving in freewheeling fashion. Lying bed according to claim 1, characterized in that the two pairs of angle levers (30, 31) are arranged mirror-symmetrically to the vertical central plane in the transverse direction and are each connected to one of the spindle drives (50, 51; 57, 58) which on the other hand are connected to the base frame (1 ) are articulated, and that these spindle drives are connected to an electrical control device (ST) which, with a first electrical key contact arrangement (T1), simultaneous spindle drive shortening of both drive spindles with a second key contact arrangement (T2), a simultaneous spindle drive extension of both spindle drives with a third key contact (T3) shuts down the one spindle drive (50, 51) and with a fourth key contact (T4) shuts down the second spindle drive (57, 58). Lying bed according to claim 4, characterized in that the two pairs of angle levers (30, 31) are arranged mirror-symmetrically to the vertical center plane in the transverse direction. Lying bed according to one of claims 1 to 5, characterized in that the angle levers (30, 31) are arranged such that the spindle drive or drives (50, 51; 57, 58) are always subjected to tension. Lying bed according to claim 1, characterized in that the two pivot axes (30S, 31S) of the angle levers (30 *, 31 *) are mounted so close to the base frame ends that the power arms (30K *, 31K *) still have sufficient freedom of pivoting and that at least one of the load arm pairs (30L *, 31L *) is configured so that it is angled so that it overhangs the base frame (1) in its lower pivot position. Lying bed according to claim 7, characterized in that the load levers (30L *, 31L *) are designed such that their articulated connections to the mattress supports (20 *, 21 *) are in their lowest position next to and lower than the base frame (10) . Lying bed according to claim 7 or 8, characterized in that the angle levers (30 *, 31 *) in the base frame (1) with their mattress frame (2) placed horizontally are arranged in parallel in their lines of action. Lying bed according to claim 7 or 8, characterized in that the angle levers (30 *, 31 *) and their spindle drives (50, 51, 57, 56) in the base frame (1) are arranged in mirror image to the diagonal. Lying bed according to one of the preceding claims, characterized in that the mattress frame supports (21 *) articulated on the mattress frame (2) are arranged in the lower mattress frame position directed obliquely inclined towards the adjacent mattress frame end. Lying bed according to claim 7, characterized in that the spindle drives (50, 57) can each be driven in a manner determined by the current direction and in a control device (ST) an accumulator (B) with a charging power supply (NT) is provided, which has a control unit with four buttons (T1, T2, T3, T4; T1, T2, T31, T41), through which a separate individual and a parallel feeding of the drives (50, 57) takes place, whereby the buttons (T1, T2) of the parallel supplies and the two Individual feed buttons (T31, T41) are coupled together by a locking circuit each time they are operated multiple times. Lying bed according to claim 12, characterized in that the drives (50, 57) are each supplied in parallel via a pair of decoupling diodes (D). Lying bed according to claim 12, characterized in that the interlocking of the key functions for each current direction consists of a series connection of normally closed contacts of the two-pole key contacts of the parallel-feeding keys (T1, T2), the working contacts of the individual feeding keys (T31, T41) being located at the end of the series connection.

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