EP1737409B1 - Treatment bed with improved lever - Google Patents

Abstract

A height-adjustable nursing bed is provided that includes a pedestal in which the upper frame and the lower frame are connected to one another by a total of four toggle lever pairs. The toggle lever pairs on each side of the bed are additionally connected to one another by horizontally and diagonally extending coupling braces. The horizontal coupling brace connects the toggle levers in the region of the toggle link while the diagonal coupling brace connects a lower toggle lever arm to an upper toggle lever arm. The motor for raising and lowering the upper frame relative to the lower frame extends directly between these two frames such that the toggle levers and their coupling braces act as a parallel linkage of sorts.

Description

In the DE 198 54 136 A1 a lifting device for a nursing bed is described. The lifting device consists of a frame which forms the base of the lifting device, as well as an approximately congruent upper frame as a lifting head. In the side of the lifting device a total of four levers are provided, each two levers are connected to each other via a knee joint. At the knee joints, the two toggle lever pairs are kinematically connected to each other by a horizontal coupling strut. Another coupling strut connects on each side of an upper of the two levers with a lower lever, such as the upper lever at the foot of the bed with the lower lever at the head end. The drive motor for moving the lifting device engages at one end on a transverse strut of the base and at the other end on a connecting strut, which connects the two horizontally extending coupling struts with each other.

Seen from the side, the lower two levers together with the horizontal coupling strut form a parallelogram of the handlebars, which is erected by the spindle motor. The upper two levers tie together with the upper frame or siphon also a parallelogram, the erection is accomplished by means of the inclined coupling strut.

Due to this kinematics occurs in the oblique coupling strut on an extremely high pressure force, which is completely independent of whether the patient is on the bed with its center of gravity near the lever at the foot or the lever at the head end.

The compressive forces that occur in the lower stroke range are enormous.

Since the spindle motor straightens the lower parallelogram, the force to be supplied by the engine when the lifting device is lowered is comparatively very large, while it decreases considerably with the parallelogram getting more and more erect. In the lower stroke range, there is a gear ratio that is about 2: 1, i. the lifter stretches twice the amount the engine extends. In the upper area, however, the stroke ratio is reversed. The consequence of this is that the lift in the upper stroke only lifts very slowly.

Based on this, it is an object of the invention to provide a lifter, in which a more favorable load distribution occurs.

This object is achieved with a nursing bed with the lifter with the features of claim 1.

The new care bed has a lift, which consists of a base and a lifter head. On the lifter head is a multipart mattress frame. On each side of the lift a Kopfendeseitiger and a Fußendeseitiger lever are provided, which are hinged to the base. The upper end of each of these levers is connected to another lever which connects the respective lower lever to the lifter head. On each side of the lifter, the pairs of levers are coupled together by a horizontal coupling strut. Another coupling strut connects per side a lower lever with an upper lever, wherein one of the levers at the foot end and the other lever is arranged at the head end. The linear drive extends between the base and the lifter head.

As a result, the kinematics completely changed over the prior art. While in the prior art, the lever mechanism as it has formed two stacked parallelograms, each of which is erected by its own drive, either in the form of the linear drive or the oblique coupling strut, the lever mechanism works as a parallel guide in the new arrangement. It absorbs the horizontal forces occurring during lifting, similar to a parallel guide.

The force occurring in the oblique coupling strut in the new solution depends on where the patient's center of gravity is. If it is in the middle between the headend side and the foot end side pair of heels, is the Force in the oblique coupling strut over the known solution more than halved.

This significantly reduces the stress in the joints that connect the oblique coupling strut or the horizontal coupling strut with the levers.

In the horizontal coupling strut occurs under load, a compressive force when the horizontal coupling strut is arranged quasi crossed to the orientation of the linear drive. The corresponding tensile forces arise in the horizontal coupling strut. Pull and pressure interchange their role when the oblique coupling strut is approximately parallel to the orientation of the linear drive. The pressure force then arises under load in the horizontal coupling strut. Nevertheless, the above applies to the load distribution, so that the engagement of the linear drive on the lifting head leads to an improvement of the force situation in the pressure strut, which can be dimensioned correspondingly weaker. Of course, the same applies to the joints, which is particularly important, since the articulation of the oblique coupling strut on the levers is a flying linkage, i. the hinge axles connecting the two components are not only subjected to shear but also to bending.

The modified kinematics also result in an improvement in engine load when comparing the force with retracted lift and extended lift. The gear ratio, which is not linear in the known solution, and changes from a ratio in a reduction, remains in the ratio of the translation, but with a reduced force, when retracted Lift, compared with the solution according to the prior art.

Moreover, it has surprisingly been found that even with the new solution linear drives can be used which show the same stroke as in the solution according to the prior art, on the condition that the same lifting height is achieved.

The tendency of the lifter head relative to the base in the case of laterally one-sided loading can be significantly reduced if at least two mutually corresponding levers on both sides of the lifter are connected to a member which suppresses torsion between the levers.

Crushing can be largely avoided when the lever relative to the base, or the siphon head, are offset inwards. This makes it possible to use the new lift without external cladding.

The base and the lifter head are each preferably formed by a rectangular frame whose longitudinal and transverse spaces, in each case preferably, formed by a rectangular frame whose longitudinal and transverse spaces are square tubes.

As a repository for the linear drive, the base contains a crossbar.

The linear drive is expediently designed in the form of a spindle motor. The spindle motor has the advantage of being self-locking and reaching the stroke position to lock as soon as the power to the motor is switched off.

Incidentally, developments of the invention are the subject of subclaims.

When reading the description of the figures, it is also clear that a number of modifications are possible which need not be explained individually.

Fig. 1

ein erfindungsgemäßes Drehbett in der Liegestel- lung,

Fig. 2

das Drehbett nach Figur, 1 in der Sessel- oder Sitzstellung,

Fig. 3

den Bettheber des Pflegebetts in einer Seiten- ansicht, teilweise als Explosionsdarstellung, und

Fig. 4

zwei der Kniehebelarme von Kniehebelpaaren an unterschiedliche Seiten, in einer Draufsicht.

In the drawing, an embodiment of the object of the invention is shown. Show it:

Fig. 1

an inventive rotary bed in the lying position,

Fig. 2

the rotary bed after FIG. 1 in the chair or sitting position,

Fig. 3

the bed lifter of the nursing bed in a side view, partially exploded view, and

Fig. 4

two of the toggle arms of toggle pairs on different sides, in a plan view.

FIG. 1 shows in a perspective view a nursing bed 1 in the lying position, while FIG. 2 the nursing bed 1 in the seat or chair position reproduces.

The nursing bed 1 has a Bettumrandung 2 with a head part 3, a foot part 4 and side walls 5 and 6. The viewer facing side wall 5 is located in the reclining position as illustrated at a distance from the floor, whereby there is a gap between the lower edge of the side wall 5 and the floor, which allows the nursing staff to deliver the toes under the bed. The side wall 5 is movably mounted and arrives in the chair position of the nursing bed 1 in a downwardly shifted position, like this FIG. 2 lets recognize. The special storage of the side wall 5 is for example in detail in the DE 199 12 937 A1 explained.

Within the Bedumrandung 2 is a bed lifter 7, as is the FIG. 3 lets recognize.

To the bed lifter 7 include a height-adjustable base 8, on top of which a rotary hinge 9 is fixed with a vertical axis of rotation, an intermediate frame 10, and a reclining frame 11, on which a mattress 12 is located. The reclining frame 11 is rectangular in plan view.

The reclining frame 11 is divided into a central portion 13 which is fixedly connected to the intermediate frame 10, a back portion 14 which is hinged to the central portion 13, a thigh portion 15 which is also hinged to the central portion 13, and a lower leg portion 16. Der Lower leg portion 16 is hinged to the remote from the central portion 13 end of the thigh portion 15. The hinge axes about which the sections 14, 15, 16 are movable relative to the central section 13 are horizontal. Finally, the foot frame 11 still has a foot portion 17 which is rigidly connected directly to the base 8.

The central portion 13 of the reclining frame 11 has two mutually parallel longitudinal bars 18, which are spaced apart according to the width of the nursing bed 1. Because of the lateral view of the visible longitudinal spar 18 conceals the underlying longitudinal longitudinal beam of the central portion 13. Each of these bars 18 ends at hinge plates for a hinge whose structure in the DE 102 50 075 A1 is described. This document is hereby incorporated by reference.

Each spar 18 carries inwardly facing pins on which rubber pieces are pushed, which absorb spring rods in a known manner. Instead of spring rods can serve as a support and a plate, as is common in hospital beds.

The back portion 14 is bounded by a spar 19 and another parallel spar, which, because of the representation in FIG. 3 can not be seen. The spar 19 is hinged to the spar 18 while the other concealed spar is connected to the longitudinal spar 18 parallel to the longitudinal beam. The two spars 19 of the back portion 14 are connected to each other via a not visible in the figure cross member at the upper end at 20. In addition, a further transverse strut 21 connects the two longitudinal members 19 at the bottom.

Also, the thigh portion 15 is limited by two longitudinal beams, of which only a longitudinal beam 22 can be seen. The other longitudinal spar is covered by the longitudinal spar 22. The two longitudinal struts 22 are connected by a transverse strut 23. The cross strut 26 extends approximately at the center of each longitudinal spar 22 at the bottom.

Finally, the lower leg portion 16 is bounded by two longitudinal beams, of which in turn only the longitudinal beam 24 can be seen in the figure. The two longitudinal beams 24 are connected to each other at the lower end at 25 via an unrecognizable transverse strut. In addition to this transverse strut, the two longitudinal bars 24 are connected by a strut 26, are fastened to the two mutually parallel guide rails 27, which extend to the end 25. As shown, they extend at an angle to the longitudinal beam 24 in such a way that they converge in the direction of the foot end 25. The distance between the two guide rails 27 is significantly smaller than the distance between the two longitudinal beams 24. Opposite these, the guide rails 27 are offset approximately 20 cm inwards.

All longitudinal beams 19, 22, and 24 bear towards the center of the bed facing pin to this rubber molded parts with the longitudinal beams 19, 22, and 24 to connect, between which spring rods extend in a known manner.

The hinges connecting adjacent longitudinal beams 18, 19, 22, 24 on each side of the bed 1 are shown schematically at 29, 30 and 31.

The lower leg portion 16 may be raised or lowered via an unillustrated electric motor. The electric motor is coupled by a gear 32 and is located in the intermediate frame 10th

Another electric motor 33 is supported in the intermediate frame 10 and leads to the cross brace 21. In this way, the back portion 14 can be raised or lowered.

The two longitudinal members 18 of the central part 13 are rigidly connected to the intermediate frame 10.

The intermediate frame 10 is composed of a square frame welded together square tubes, of which only a square tube 34 can be seen. The parallel square tube is hidden by the square tube 34.

The rectangular frame is narrower than the distance between the longitudinal members 18 corresponds to each other. At the mutually parallel square tubes 34 a total of four arms 35 are welded, of which two each carry a longitudinal beam 18. The booms 35 are horizontal and perpendicular to the longitudinal axis of the nursing bed. 1

The rotary hinge 9 connects the intermediate frame 10 with the height-adjustable base 8. It consists of a ring 36 and a rotatably mounted in the ring 34 turntable 37 together. The fifth wheel 37 is bolted to the intermediate frame 10 via screws, not shown. The exact structure of the rotary hinge 9 is in the DE 102 50 075 A1 which is incorporated herein by reference.

By means of the rotary hinge 9 of the intermediate frame 10 is rotatable together with the reclining frame 11 with respect to a vertical axis of rotation. The turning geschient by means of an electric motor 38, which is supported at one end to the base 8 and the other end on the turntable 37.

To the height-adjustable base 8 include an upper frame 39 and a frame 41, the corresponding from consist of welded square tubes, of which two mutually parallel square tubes form longitudinal beams 39a and 41a. Over a total of four toggle lever pairs 42 and 43, the upper frame 39 is supported on the lower frame 41. The rotary hinge is connected to the upper frame 39.

The knee lever pairs 42, 43 are each located next to a longitudinal side of the base 8, so that the corresponding knee lever pairs 42, 43 on the other longitudinal side in the side view of FIG. 3 are not recognizable.

The toggle lever pair 42, 43 is composed of an upper toggle lever 44 and a lower toggle 45. Each knee lever 42, 43 is hingedly connected to the upper and lower frames 39, 41, respectively, via a horizontal axis hinge 46 on the respective side of the bed. All axes of the hinges 46 are parallel to each other. The hinges 46 are coaxial with their axes to the axes of the hinges of the unrecognizable toggle 42, 43.

Hinges 47 connect the toggle pairs 42, 43 to the lower frame 41. The axes of the hinges 47 are parallel to the axes of the hinges 46, the axes of hinges 46, 47 corresponding to each other on both sides being coaxial with each other.

The two toggle pairs 42, 43 on each side of the base 8 are each coupled by an associated horizontal coupling strut 48 with each other. Each coupling strut 48 is, as shown, hingedly connected to the knee joint 49 of each toggle lever pair 42,43.

Finally, on each side of the base 8, an obliquely extending coupling strut 50 connects the upper toggle lever arm 44 of the toggle lever pair 42 to the lower toggle lever arm 45 of the toggle lever pair 43.

An electric motor 51, which, like the electric motors 33, 38, is designed as a spindle motor, extends between the upper frame 39 and the lower frame 41. It is articulated next to the toggle lever 42 on a transverse strut 52 of the lower frame 41 indicated by dashed lines. Its other end is hinged to a hidden cross strut of the upper frame 39, and in addition to the toggle 43. The motor is thus directly between the two frames 39 and 41, he is crossed to the oblique coupling strut 50th

The toggle levers 42, 43 cooperate with the horizontal coupling strut 48 and the oblique coupling strut 50 as a kind of parallel guide for the relative movement of the two frames 39 and 41st

In that regard, there is a fundamental difference to the kinematics of the bed lifter as he in the DE 102 50 075 is shown. In this lifter, the motor engages a cross strut, which connects the two horizontal coupling struts with each other. As a result of this arrangement, a lower link parallelogram and an upper link parallelogram are kinematically formed, in which the horizontal coupling strut is common to both linkage parallelograms. The lower parallelogram is erected by the drive motor. The oblique coupling strut transmits in this known solution, the righting movement of the lower link parallelogram on the upper Lenkerparallelogram.

In the arrangement shown, the kinematics is completely different. The arrangement of the toggle lever in conjunction with the coupling struts must in the new kinematics, in which the drive motor between the lower and upper frame 39, 41, absorb the lateral forces occurring during lifting and lowering in the horizontal direction. The kinematics must prevent the transverse force emanating from the engine from displacing the upper frame 39 with respect to the lower frame 41 in the bed longitudinal direction, instead of lifting the upper frame 39.

In one area a fairly accurate parallel guidance of the upper frame 39 with respect to the lower frame 41 is achieved, ie the hinge axis of the upper hinges 46 remain almost at the vertical which passes through the axis of the lower hinges 47. This range includes an angle of the lower toggle arm 45 relative to the horizontal of about 12 ° to an angle of approximately 80 °, also measured from the horizontal. Compared to the known solution according to the DE 102 50 075 A1 With otherwise the same geometry, the force to be applied by the motor 41 in the longitudinal direction of the spindle motor 41 decreases by a factor of 2.5 in the order of magnitude.

In FIG. 3 the toggle arms 44 and 43 are directly hinged to the longitudinal beams 39a, 41a of the upper and the lower frame 39, 41.

Another possibility of connecting the toggle lever arms 45 to the subframe 39 is shown in partial detail in FIG.

FIG. 4 shows a cross section through the subframe. approximately near the crossbar 52, looking towards the foot end.

FIG. 4 lets the two lower longitudinal beams 41a recognize in cross section. Between the two longitudinal bars 41a extends a tubular shaft 53, which contains end unrecognizable sockets. The shaft 53 is rotatably supported by the bearing pins 54 between the two longitudinal bars 41a. The bearing pins 54 pass through corresponding holes in the longitudinal members 41 a and show with its free end in the bearing bush contained in the tube 53.

The two lower toggle arms 45 of the right and left toggle pair 42, which is located at the foot end, are spaced from the front ends of the tube 43 with these, as shown, welded. The upper end of the toggle lever arms 45 is, as described, pivotally connected to the associated toggle lever arms 44 with the interposition of the horizontal coupling strut 48.

The arrangement shown provides improved tipping stability or tilting rigidity of the upper frame 39 with respect to the lower frame 41.

Since the spindle motor 51 is arranged approximately centrally between the longitudinal bars 41 a, it comes with one-sided load, as occurs in the chair or sitting position, to an unbalanced load with the result of a tendency to tilt of the upper frame 39 relative to the lower frame 51. This tilting movement would have As a consequence, the knee lever pairs buckle more on the loaded side than on the less loaded side. Because at least one sentence of Toggle pairs, eg. The foot-side, the lower lever are torsionally connected to each other, the lower toggle arms 45 of the foot-side toggle lever pair 42 can not rotate against each other. The result is a smaller tilt of the upper frame 39 relative to the lower frame 41st

A further improvement of the stiffening can be achieved if the in FIG. 4 shown connection between the lower toggle arms 45 is also provided for the lower toggle arms of the head-side toggle lever pair 43. Finally, if space permits, it is also possible to torsionally couple the upper toggle lever arms 44 in the same manner via a tube and to support this tube between the longitudinal bars 41a in the analogous manner as shown in FIG FIG. 4 is shown.

A height-adjustable nursing bed has a base, in which the upper frame and the lower frame are connected by a total of four toggle lever pairs. The toggle pairs on each side of the bed are additionally connected by horizontal and oblique coupling struts. The horizontal coupling strut connects the toggle lever in the area of the knee joint, while the oblique coupling strut connects a lower toggle lever arm with an upper toggle lever arm. The motor for raising and lowering the upper frame relative to the subframe extends directly between these two frames, so that the toggle together with their coupling struts act as a kind of parallel guide, which is simulated exclusively by means of hinge joints, which makes sliding guides unnecessary.

Claims (12)

1. Treatment bed (1)
   with a multipart mattress support (11), which has a head end and also a foot end, with a height-adjustable bed raising means (7), which has a base frame (41) standing on the floor and a raising head (39), on which the mattress support (11) is arranged, with a lever mechanism (42, 43, 48, 50), which connects the base frame (41) to the raising head (39) and which includes on each side of the bed raising means (7):

   • a head end side and also a foot end side lower lever (45), which are both articulated at their lower ends to the base frame (4 1 ),

   • a horizontal coupling strut (48), which is connected to the upper ends of the two lower levers (45) to be able to pivot,

   • a head end side and also a foot end side upper lever (44), which are both articulated at their upper ends to the raising head (39) to be able to pivot, and

   • an inclined coupling strut (50), which connects an upper lever (44) to a lower lever (45) and which is connected to the respective lever (44, 45) in the region between the ends thereof to be able to pivot, and

   with a linear drive (51), which runs from the base frame (41) to the raising head (39).
2. Treatment bed according to claim 1, characterised in that mutually corresponding articulation axes are coaxial to one another on the two sides of the lever mechanism (42, 43, 48, 50).
3. Treatment bed according to claim 1, characterised in that the inclined coupling strut (50) is inclined in the same direction as the linear drive (51).
4. Treatment bed according to claim 1, characterised in that the inclined coupling strut (50) is inclined in the opposite direction to the linear drive (51).
5. Treatment bed according to claim 1, characterised in that at least one lever (44, 45) on one side of the lever mechanism (42, 43, 48, 50) and the corresponding lever (44, 45) on the other side of the lever mechanism (42, 43, 48, 50) are connected to a common torsion element (53) in order to minimise rotation of the levers (44, 45) relative to one another in the case of uneven load.
6. Treatment bed according to claim 1, characterised in that the levers (44, 45) are set back in relation to the outer contour of the base (41).
7. Treatment bed according to claim 1, characterised in that the base frame (41) is formed by a rectangular frame.
8. Treatment bed according to claim 7, characterised in that the rectangular frame (41) has a cross strut (52), which serves as an abutment for the linear drive (51).
9. Treatment bed according to claim 1, characterised in that the linear drive (51) is formed by a spindle motor.
10. Treatment bed according to claim 1, characterised in that the spindle motor is self-locking.
11. Treatment bed according to claim 1, characterised in that a spring arrangement lies parallel to the linear drive (51).
12. Treatment bed according to claim 1, characterised in that the spring arrangement is formed by a gas spring.

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