EP1543744B1 - Lifting device for beds - Google Patents

Description

The present invention relates to a lifting device for beds, especially for hospital and nursing beds.

Such a lifting device is from the document DE 296 05 577 U1 known. This document discloses in particular in the Figures 5 and 6 a lifting device having a first and a second telescopic leg, the legs each having a fixed lower leg portion and a movable upper leg portion. The legs are connected to each other via a cross member. Furthermore, the lifting device has a rotary drive for the simultaneous length adjustment of the legs of the lifting device. For length adjustment by means of the rotary drive also a first and a second traction means are used. For this purpose, the traction means are guided by the rotary drive via two guide rollers fixedly mounted in the lower leg part and a deflection roller mounted at the lower end of the lower leg part. In the area between one of the two upper deflection rollers and the lower deflection roller, the traction means is fastened with both ends to a common fastening point on the upper leg part. By a pulling movement on the traction means due to a rotation of the rotary drive then the common attachment point of the traction means is moved relative to the upper guide rollers and the lower guide roller. Thereby, the upper leg part is moved in the lower leg part and the lifting device performs a lifting movement.

A disadvantage is that the lifting device described simply has telescopic legs. Only relatively small adjustment heights are achievable.

A lifting device with the features of the preamble of claim 1 is further from the document with the

publication number DE 87 63 21 C known. This document discloses a lifting device for a height-adjustable table, which simply has telescopic legs with which only relatively small adjustment heights, which are not sufficient for example, for beds that are used in the field of nursing or nursing.

Other lifting devices are known from the publications with the publication numbers De 44 05 508 A1 . DE 101 02 484 A1 . DE 22 04 299 A and DE 83 10 826 U1 known, all of which have only telescopic legs mainly for height-adjustable tables.

From the publication DE 91 10 687 U1 On the other hand, individual double-telescopic legs are known. The legs disclosed in this document require at least two traction means such as ropes, chains or V-belts for each telescopically leg twice. This leads z. As to that, if one uses the disclosed in the latter document twice telescopically legged in a device according to the first-mentioned document, a total of four traction means must be used. This has a considerable installation effort and design effort result, which is to be minimized.

The invention is therefore based on the object to propose a lifting device, which is structurally simple, and whose legs can be made without a large additional construction or installation effort also twice telescopically.

This object is achieved by a lifting device according to claim 1. Accordingly, in a lifting device according to the invention, a first end of the first traction means or the second traction means at the lower end of the upper Leg portion of the second leg or the first leg attached. On the other hand, a second end of the first traction means or of the second traction means is attached at least indirectly to the upper leg part of the first leg or of the second leg. In addition, the first traction means and the second traction means intersect in the region between the first and the second leg. The device according to the invention has two-fold telescopic legs in order to achieve a larger stroke in a compact design. For this purpose, the legs each comprise a middle leg part, which is movable in each case to the lower leg part and the upper leg part.

The basic principle of the device according to the invention is that by means of the rotary drive, the first traction means or the second traction means is pulled from the first leg or to the second leg and thereby the upper leg portions of the legs are moved downwards or upwards relative to the lower leg parts ,

In order to further improve the function of the device according to the invention, the device has a first group of deflection rollers and a second group of deflection rollers. The first group of pulleys comprises a deflection pulley, referred to as a third pulley, in the region of the lower end of the middle leg portion of the second leg, and the second group of pulleys comprises a pulley called a third pulley in the region of the lower end of the middle leg portion of the first leg.

The individual deflection rollers of the first group can be arranged in the lifting device as follows: At least one first deflection roller is mounted in the region of the lower end of the lower leg part of the first leg. A second pulley of the first group of pulleys may be mounted in the region of the upper end of the lower leg portion of the second leg. The second Group of deflection rollers may comprise at least a first deflection roller in the region of the lower end of the lower leg portion of the second leg, while a second deflection roller may be mounted in the region of the upper end of the lower leg portion of the first leg.

In a device according to the invention, the first traction means can then extend from its second end via the at least one first deflection roller of the first group, the rotational drive and the second deflection roller of the first group to the first end of the first cable. Analogously, the second traction means may be guided from its second end via the at least one first deflection roller of the second group, the rotation drive and the second deflection roller of the second group to the first end of the second traction means.

Furthermore, the first group of deflection rollers may comprise a fourth deflection roller, which is arranged in the region of the upper end of the middle leg portion of the second leg part. Similarly, the second group of pulleys may comprise a third pulley in the region of the lower end of the middle leg portion of the first leg and advantageously comprise a fourth pulley in the region of the upper end of the middle leg portion of the first leg.

In such a lifting device with doubly telescopic legs, the first traction means between the second guide roller of the first group and the second end over the third guide roller and the fourth guide roller can be performed. In an analogous manner, the second traction means may be guided in such a lifting device between the second guide roller of the first group and its second end on the third guide roller and the fourth guide roller.

Due to the double-telescopic leg, a large stroke of the lifting device at the same time compact design of the

Lifting device can be achieved. At the same time, the legs of the lifting device are adjustable in length with only one traction means such as a rope, a chain or a V-belt.

The first traction means and the second traction means of a lifting device according to the invention can be driven via a drive roller of the rotary drive. It is possible that the first and the second traction means are in frictional engagement with the drive roller and the frictional connection is sufficient that the force is transmitted from the drive roller to the traction means-n to the traction means in one or the other To draw direction. Thus an effective frictional Connection is made between the drive roller and the traction means, the traction means preferably loop around the drive roller several times.

In an alternative embodiment, the traction means can also be fixed to the drive roller, for example by clamping. This can be done for example via a radial bore through the drive roller, through which the traction means are passed. The frictional connection is then improved and the risk of slippage of the traction means on the drive roller is reduced.

The drive roller can either be driven directly by a drive shaft, but it is also possible that the drive roller is driven by a drive shaft via a belt. The drive shaft is preferably led out of a transmission which is driven by a motor.

A lifting device according to the invention may comprise a brake, which preferably brakes the movement of the lifting device when retracting the legs or prevents sagging of the moving parts of the lifting device when the rotary drive is at a standstill. If a brake is not provided, in addition to the force applied by the drive for retracting the legs, the force of gravity also acts, as a result of which the retraction movement of the legs can be greatly accelerated. It acts in addition to the gravity of the moving parts of the lifting device, where appropriate, the gravity of the bed frame and a person lying in bed. A brake has the advantage that it acts against the gravity of moving parts of the lifting device, the mattress frame and lying on the bed person and so at a standstill Lifting device prevents sagging of the lifting device by gravity.

The brake of a lifting device according to the invention can have a wrap spring. The wrap is mounted on the drive shaft and at the same time attached at one end to a non-rotating part, that upon extension of the lifting device, the wrap is opened and the drive can rotate freely, while retracting the wrap is closed and the drive and the acting gravity must work against the force of the twisted wrap.

Fig. 1

zeigt einen Schnitt durch eine Hubvorrichtung gemäß Linie I - I in Fig. 3 im ausgefahrenen Zustand der Hubvorrichtung,

Fig. 2

zeigt einen Schnitt durch die Hubvorrichtung gemäß der Linie I - I in Fig. 3 im eingefahrenen Zustand,

Fig. 3

zeigt eine Draufsicht auf die Hubvorrichtung,

Fig. 4

zeigt eine perspektivische Ansicht eines Pflegebetts mit zwei erfindungsgemäßen Hubvorrichtungen gem. Fig. 1 bis 3,

Fig. 5

zeigt eine Seitenansicht des Betts gemäß Fig. 4,

Fig. 6

zeigt eine Frontansicht des Betts gemäß Fig. 4 und 5,

Fig. 7

zeigt eine Ansicht beider über Längsträger verbundenen Hubvorrichtungen des Betts gemäß Fig. 4 bis 6,

Fig. 8

zeigt eine Draufsicht auf eine zweite erfindungsgemäße Hubvorrichtung,

Fig. 9

zeigt einen Schnitt durch die Hubvorrichtung gemäß Fig. 8 entlang der Linie IX-IX im ausgefahrenen Zustand,

Fig. 10

zeigt einen Schnitt durch die Hubvorrichtung gemäß Fig. 8 entlang der Linie IX-IX im eingefahrenen Zustand,

Fig. 11

zeigt die Hubvorrichtung gemäß Fig. 8 bis 10 entlang der Linie IX-IX in der Rollstellung,

Fig. 12

zeigt die zweite Hubvorrichtung gemäß Fig. 8 bis 11 im Schnitt entlang der Linie XII-XII in Fig. 7,

Fig. 13

zeigt eine Draufsicht auf die Hubvorrichtung gemäß Fig. 8 bis 12 bei abgenommenem oberen Querträger,

Fig. 14

eine Einzelheit aus Fig. 13 gemäß XIV-XIV und

Fig. 15

eine Einzelheit der zweiten Hubvorrichtung gemäß der Fig. 8 bis 14 in perspektivischer Darstellung.

Two embodiments of a lifting device according to the invention and a nursing bed with lifting devices according to the invention is described in more detail with reference to the drawing.

Fig. 1

shows a section through a lifting device according to line I - I in Fig. 3 in the extended state of the lifting device,

Fig. 2

shows a section through the lifting device according to the line I - I in Fig. 3 when retracted,

Fig. 3

shows a plan view of the lifting device,

Fig. 4

shows a perspective view of a nursing bed with two lifting devices according to the invention. Fig. 1 to 3 .

Fig. 5

shows a side view of the bed according to Fig. 4 .

Fig. 6

shows a front view of the bed according to Fig. 4 and 5 .

Fig. 7

shows a view of both longitudinal beams connected lifting devices of the bed according to 4 to 6 .

Fig. 8

shows a plan view of a second lifting device according to the invention,

Fig. 9

shows a section through the lifting device according to Fig. 8 along the line IX-IX in the extended state,

Fig. 10

shows a section through the lifting device according to Fig. 8 along the line IX-IX in the retracted state,

Fig. 11

shows the lifting device according to Fig. 8 to 10 along the line IX-IX in the rolling position,

Fig. 12

shows the second lifting device according to 8 to 11 in section along the line XII-XII in Fig. 7 .

Fig. 13

shows a plan view of the lifting device according to 8 to 12 with removed upper cross member,

Fig. 14

a detail Fig. 13 according to XIV-XIV and

Fig. 15

a detail of the second lifting device according to the 8 to 14 in perspective view.

That in the FIGS. 4 to 6 shown nursing bed has two lifting devices, which include two-fold telescoping legs. The individual limbs of the legs (leg parts) of a lifting device are covered by covers 48 to 53. The foot-end lifting device has for this purpose a lower cover 51, a middle cover 52 and an upper cover 53. The head-end lifting device is covered by a lower cover 48, a middle cover 49 and an upper cover 50. The two lifting devices 1 are connected to each other via longitudinal members 54, 55 of which in Fig. 4 only the longitudinal member 54 can be seen. At the upper ends of the lifting device, a frame of the nursing bed is mounted, which consists of a right frame member 45, a left frame member 46 and a Fußendteil 47 a and a Kopfendteil 47. On the frame, a support surface is arranged for a mattress, which is formed by the support members 41, 42, 43, 44. A first support part 41 serves to support the hull of a bed occupant and is preferably designed to be height adjustable. The foot-end support parts 43, 44 are also preferably designed to be adjustable and serve to support the thigh or the lower leg of a bed occupant. The bed according to the FIGS. 4 to 6 is in Fig. 7 without the right frame part 45, the left frame part 46, the head part 47, the foot part 47a and the support parts 41, 42, 43, 44 shown. There remain, therefore, over the longitudinal beams 54, 55 interconnected lifting devices 1, which are of similar design and hereinafter with reference to FIG FIGS. 1 to 3 be described in more detail.

Each of the lifting devices 1 is equipped with rollers 2, whereby the lifting devices 1 and thus also the beds 40 are displaceable. The rollers 2 are pivotally mounted on a roller carrier 4 via pivot bearings 3.

The lifting devices 1 each have a first and a second telescopically double leg, each having a lower leg portion 7a, 7b, a middle leg portion 8a, 8b and an upper leg portion 9a, 9b. The lower leg portion 7a of the first leg is fixedly connected to the lower leg portion 7b of the second leg in a frame-like manner via a lower cross member 5 and a middle cross member 6. On the outside of the lower leg portion 7a of the first leg and the leg portion 7b of the second leg, the roller supports 4 of the rollers 2 are mounted.

The lower leg portion 7a of the first leg and the lower leg portion 7b of the second leg are substantially tubular. The inner diameter of the lower leg part 7a of the first leg and the lower leg part 7b of the second leg is dimensioned such that the middle leg part 8a of the first leg in the lower leg part 7a of the first leg and analogously the middle leg part 8b of the second leg in the lower leg Leg part 7b of the second leg is slidably mounted.

Also, the middle leg portion 8a of the first leg and the middle leg portion 8b of the second leg are tubular. The middle leg parts 8a, 8b in each case have an inner diameter which is dimensioned such that the upper leg part 9a of the first leg or the upper leg part 9b of the second leg in the respective middle leg part 8a, 8b of the first and the second leg is displaceable. Incidentally, the upper ends of the upper leg parts 9a, 9b are fixedly connected to each other with an upper cross member 10. As a result, the first and the second leg can only be extended or retracted parallel to one another.

At the lower end of the lower leg part 7a, 7b of the first leg or of the second leg, an outer first deflection roller 12, 22 is mounted on the inside, that is, between the walls of the respective leg part 7a, 7b. To this outer first guide roller 12, 22 is inwardly offset immediately outside the respective lower leg portion 7a, 7b, an inner first guide roller 13, 23 attached to the lower support 5. Further, second pulleys 14, 24 are attached to the middle cross member 6 immediately adjacent to the upper ends of the lower leg parts 7a, 7b. In addition, at the lower ends of the middle leg parts 8a, 8b third deflection rollers 15, 25 are mounted, these third deflection rollers 15, 25 are fixed to the middle leg portions 8a, 8b, that they are guided in an inner longitudinal slot of the lower leg portions 7a, 7b are. Finally, fourth pulleys 16, 26 are attached to the upper ends of the middle leg parts 8a, 8b, these fourth pulleys 16, 26 dipping inside the lower ends of the upper leg parts 9a, 9b. For fastening these fourth deflection rollers 16, 26, the middle leg parts 8a, 8b have a tube which is concentric with the outer wall of the middle leg parts 8a, 8b at the lower end of the middle leg parts with the outer wall is connected and has an outer diameter which is smaller than the inner diameter of the upper leg portions 9a, 9b, so that this concentrically attached to the lower end of the middle leg portions 8a, 8b tube can immerse in the retracted state of the lifting device 1 in the upper leg portions 9a, 9b ,

At the middle cross member 6, a drive means is provided, with which the lifting device 1 can be extended or retracted. The drive means has for this purpose a motor 32 which is connected via a gear 31 with a drive shaft 30 whose axis is perpendicular to the central cross member 6. On the drive shaft 30, a drive roller 20 is attached. Immediately adjacent to this drive roller 20, a pinch roller 19 is mounted, whose axis of rotation is also perpendicular to the central cross member 6, wherein the pinch roller 20 is mounted on the cross member.

The lifting device 1, as in the FIGS. 1 to 3 is completed by a first cable 11 and a second cable 21 completed. These ropes 11, 21 are each associated with a group of deflection rollers, wherein the first cable 11, the outer first guide roller 12, the inner first guide roller 13, the second guide roller 14, the third guide roller 15 and the fourth guide roller 16 are assigned. To the second group of pulleys, which is associated with the second cable 21, the outer first pulley 22, the inner first pulley 23, the second pulley 24, the third pulley 25 and the fourth pulley 26 counts.

The first cable 11 is arranged in the lifting device as follows. With a first end 17, the first cable 11 is attached to the lower end of the upper leg part 9b. Starting from there, it is guided upwards to the fourth deflection roller 16. By the Deflection pulley, the first cable 11 undergoes a reversal of direction down to the third guide roller 15, which is attached to the lower end of the central leg portion 8b. Again, the first cable 11 is deflected by 180 °, so that in the following up to the second guide roller 14 extends. Starting from the second deflection roller 14, the first cable 11 is guided several times around the drive roller 20, from which the first cable is guided via the pressure roller 19 to the inner first deflection roller 13. From the inner first guide roller 13, the first cable then extends horizontally to the outer first guide roller 12, from which the first cable is guided upward, to be attached with its second end 18 to the upper cross member 10.

The second cable 21 is arranged substantially in mirror image to the first cable 11, wherein it is guided over the deflection rollers of the second group of deflection rollers 22, 23, 24, 25, 26. Accordingly, the first end 27 of the second cable 21 is fixed to the lower end of the upper leg part 9a. From there it runs up to the fourth guide roller 26, which leaves the second cable 21 down to the third guide roller 25, which again deflects the second cable 21 by 180 °. Then, the second cable 21 is guided to the second guide roller 24. The second cable 21 leaves the second guide roller 24 horizontally to the center of the central cross member 6, to then be repeatedly guided around the drive roller 20. From the drive roller 20, the second cable 21 is then guided to the inner first roller 23 and from there to the outer first roller 22. The outer first guide roller 22 then leaves the second cable 21 upwards so as to be fastened to the upper cross member 10 with its second end 28 analogous to the first cable 11.

By a rotation of the drive roller 20 due to commissioning of the motor 32, depending on the direction of rotation of the first rope 11 is moved from the second deflection roller 14 to the first inner deflection roller 13 and at the same time the second rope 21 is moved from the first inner roller 23 to the second deflection roller 24 or vice versa. In this case, only the force acting between the respective cable 11, 21 and the drive roller 20 frictional force is utilized for transmitting the torque from the drive roller 20 to the first cable 11 and the second cable 21. This frictional force is increased by the multiple wrapping of the drive roller 20 through the first cable 11 and the second cable 21. The pressure roller 19 has the task that the forces acting on the drive shaft 30 via the first cable 11 and the second cable 21 (radial) forces are directed symmetrically against each other, and so cancel. This makes it possible to store the drive shaft only in the transmission 31. In an advantageous embodiment of a lifting device according to the invention this is also implemented. Likewise, it is possible, while omitting the pinch roller 19, to guide the first cable 11 directly from the inner first deflection roller 13 to the drive roller 20. Then, however, it is necessary that the drive shaft 30 is supported not only in the transmission 31 but also with its opposite end.

By a rotation of the drive roller 20 in the counterclockwise direction, the first cable 11 is pulled by the first leg 7a, 8a, 9a in the direction of the second leg 7b, 8b, 9b. At the same time, the second cable 21 is moved in the opposite direction, that is, from the second leg 7b, 8b, 9b to the first leg 7a, 8a, 9a. This results in an extended lifting device, as in Fig. 1 is shown, that the cross member 10 is shortened by the shortening of the cable section between the second end 18 of the first cable 11 and the second end 28 of the second cable 21 and the respective outer first guide rollers 12, 22. The cross member is thereby pulled down. The by pulling down the Cross member 10 between the second end 18 and 28 and the outer first guide rollers 12 and 22 obtained rope length is pulled by the movement of the drive roller 20 in the direction of the second guide rollers 14 and 24 respectively. By the downward movement of the cross member 10, the lower end of the upper leg parts 9a, 9b is moved down and the upper leg parts 9a, 9b dip into the middle leg parts 8a, 8b. As a result, the distance between the lower end of the upper leg parts 9a, 9b, to which the first ends of the first cable 11 and the second cable 21 are attached, and the fourth guide rollers 16 and 26 extends. The extension of the distance corresponds exactly to this Length by which the distance between the upper cross member 10 and the outer first guide pulley shortens. Due to the pulling movement on the first cable 11 and the second cable 21, the rope length obtained by shortening the distance between the second end 18 or 28 and the first outer deflection roller 12 or 22 is increased by increasing the distance between the first end 17 or 18 of the cables 11, 21 and the fourth roller 16 and 26 consumed.

After a certain time of counterclockwise rotation of the drive roller 20, if the lower end of the upper leg parts 9a, 9b are completely immersed in the middle leg parts 8a, 8b and at the same time the upper end of the middle leg parts 8a, 8b are struck on the cross member 10, there is no Relative movement more between the upper leg portions 9a, 9b and the middle leg portions 8a, 8b possible. However, when the driving movement is continued by the motor 32 and the drive roller 20 continues to rotate counterclockwise, relative movement between the middle leg parts 8a, 8b and the lower leg parts 7a, 7b occurs. By further pulling movement of the first cable 11 from the first leg 7a, 8a, 9a and to the second leg 7b, 8b, 9b of the second cable 21 from the second leg 7b, 8b, 9b to the first leg 7a, 8a, 9b, the cross member 10 is pulled further down. In the process, the middle leg parts 8a, 8b dip into the lower leg parts 7a, 7b. The rope length obtained by shortening the distance of the cross member 10 and the outer first rollers 12, 22 is then compensated by increasing the distance between the second deflection rollers 14, 24 and the third deflection rollers 15, 25.

Incidentally, it is also possible that during the retraction movement of the lifting device 1, the middle leg portions 8a, 8b are moved into the lower leg portions 7a, 7b before the upper leg portions 9a, 9b by the pulling movement on the first cable 11 and the second Rope 21 are pulled into the middle leg parts 8a, 8b.

Turns, however, especially in a retracted lifting device ( Fig. 2 ), the drive roller 20 in a clockwise direction, the first cable 11 is pulled by the second leg 7b, 8b, 9a toward the first leg 7a, 8a, 9a. At the same time, the second cable 21 is pulled by the first leg 7a, 8a, 9b in the direction of the second leg 7b, 8b, 9b. As a result of the pulling movement of the first cable 11, from the second leg 7b, 8b, 9b to the first leg 7a, 8a, 9a, the distances between the second guide roller 14 and the third guide roller 15 and, on the other hand, between the third one shorten successively or simultaneously Deflection roller 15 and the fourth guide roller 16. The simultaneous pulling movement of the second cable 21, the corresponding distance between the second guide roller 24 and the guide roller 25 and the third guide roller 25 and the fourth guide roller 26 is shortened. As a result, the upper cross member 10 moves upward and the lifting device 1 is extended. The by the pulling movement of the cables 11, 21 and the shortening of the distances between the respective second guide roller 14 and 24 and the third guide roller 15 and 25 on the one hand and the respective third guide roller 15 and 25 and the On the other hand recovered pulley length is compensated by increasing the distance between the second end 18, 28 of the first cable 11 and the second cable 21 and the outer first guide rollers 12, 22.

The in the FIGS. 8 to 15 illustrated lifting device according to the invention corresponds in its basic structure of the lifting device according to the FIGS. 1 to 3 , There are therefore parts of the second lifting device according to the invention provided with the same reference numerals as parts of the first lifting device according to the Fig. 1 to 3 if these parts correspond in function to each other. In particular, the structure of the legs of the second lifting device is so similar to the construction of the legs according to the first lifting device, so that with respect to the structure of the legs to the description of the Fig. 1 to 3 is referenced.

Also, the guidance of the first cable 11 and the second cable 21 in the lifting device according to the FIGS. 8 to 15 corresponds essentially to the cable guide in the lifting device according to the Fig. 1 to 3 , The main difference in the cable guide is that in the lifting device according to the Fig. 1 and 2 the second end 18 of the first cable and the second end 28 of the second cable 21 are arranged between the two legs and not as in the lifting device according to the Fig. 1 and 2 on the outside of both legs. This eliminates in the two groups of roles, the respective outer first roller, on which in the lifting device according to the Fig. 1 to 3 the first cable 11 and the second cable 21 are deflected upwards. In the lifting device according to the Fig. 8 to 15 the first cable 11 and the second cable 21 are deflected directly from the then single first roller 12 and 22 upwards.

By this arrangement of the second ends 18, 28 of the first cable 11 and the second cable 21 on the inside of the two legs 7, 8, 9 can in comparison to the lifting device according to the Fig. 1 and 2 the outer first rollers are saved. The lifting device according to the Fig. 8 to 15 This makes it even more compact.

The lifting device according to the Fig. 8 to 15 In addition, this also makes it more compact than the lifting device according to the Fig. 1 to 3 in that the motor 32 and the transmission 31 are arranged lying between the two legs 7, 8, 9. In contrast, in the lifting device according to the Fig. 1 to 3 the motor 32 and the gear 31 at least partially in an area outside the space between the two legs 7, 8, 9 arranged, as well as well from the representation of the nursing bed according to the Fig. 4 to 7 can recognize.

Due to the different arrangement of the motor 32 and the transmission 31 and the now other space between the two legs 7, 8, 9 of the lifting device, it proved to be advantageous that the drive roller 20 via a toothed belt 34 indirectly from the drive shaft 30, which from the Gear 31 is led out, is driven. The drive shaft 30 has for this purpose a gear 33, in which the toothed belt 34 engages. Likewise, the drive roller 20, a gear 35 which is in engagement with the toothed belt 34. The drive roller 20 has, in contrast to the drive roller 20 of the lifting device according to the Fig. 1 to 3 two radial holes on. Through these radial holes in the drive roller, the first cable 11 and the second cable 21 is passed. The ropes 11, 21 buckle after their exit from the radial bores in a substantially right angle and are thus determined by clamping in the bore. The guided through the radial bores portion of the cables 11, 21 can thus not be unwound from the drive roller 20. In order that the cable length of the first cable 11 and the second cable 21 between the drive roller and the first end 17, 27 and the second ends 18, 28 during extension or retraction of the lifting device can be changed, it must be ensured that the required additional cable length of the Drive roller 20 can be handled or that the excess length of rope can be wound onto the drive roller 20.

The lifting device according to the Fig. 8 to 15 has a brake which decelerates the retraction movement of the lifting device and compensates in particular the forces acting on the moving parts of the lifting device gravitational forces. This makes it possible to retract the lifting device at approximately the same speed as it can be extended. The brake also ensures that the extended lifting device does not sag down when the motor 32 is stopped due to forces acting on the moving parts of the lifting device without starting the motor 32.

As a brake, the lifting device according to the Fig. 8 to 15 advantageously a wrap spring 36. This wrap spring 36 is fixed at one end to a holding element 37, which is part of an angle plate 38. This angle plate 38 is secured by screws 39 to the lower cross member 5 of the lifting device. The wrap spring 36 is thus fixed with its one end opposite the lower cross member 5 and thus the lower two parts 7a, 7b. The wrap spring is penetrated by the drive shaft 30. The wrap spring 36 is so close to the drive shaft 30 that, depending on the rotation of the drive shaft 30, the wrap spring is closed or opened. The lifting device according to the Fig. 8 to 15 is set up so that at a Retracting the lifting device causing rotational movement of the drive shaft 30, the wrap spring 36 is closed and the motor 32 must work against the force applied by the wrap spring 36 force. Even when the motor 32, the wrap spring 36 is so close to the drive shaft 30 that when pressing the lifting device without starting the motor 32 against the force of the wrap spring 36 must be worked. If, however, the motor 32 is put into operation so that the lifting device is extended, the rotation of the drive shaft 30 causes an opening of the wrap spring 36. The drive shaft 30 is thereby substantially free of a force by the wrap spring, so that the drive shaft 30 basically taken free from the wrap spring 36 can rotate. The brake thus does not act during the extension of the lifting device.

Another difference between the lifting device according to the Fig. 1 to 3 and the lifting device according to the Fig. 8 to 15 lies in the attachment of the rollers 2 on the frame formed by the legs 7, 8, 9 and the upper cross member 6 and the lower cross member 5. While the rollers 2 in the lifting device according to the Fig. 1 to 3 are fastened directly to the frame via a roller carrier 4, the roller carrier 4 in the lifting device according to the Fig. 8 to 15 adjustable in height relative to the frame. The rollers 2 are attached to the lower end of a tubular roller carrier 4. This roller carrier 4 is mounted vertically displaceable in a socket of a pedestal carrier 70. At the same time 70 feet 71 are fixed to the base support on which the bed normally rests. However, if the bed is to be moved, the lifting device must be fully retracted to be brought into a rolling position. When retracting the lifting device, the upper cross member 10 strikes at the upper end of the roller carrier 4. Pressed by a further retraction of the lifting device the upper cross member 10 on the free ends of the roller carrier 4, whereby the roller carrier 4 is pressed against the pedestal carrier 70 down. The roller carrier 4 is thereby pushed out of the bottom of the pedestal carrier 70. The pushing out of the roller carrier 4 and the associated rollers causes the feet 71 to lift off the ground. The bed is then in a rolling position and can be easily moved on the rollers 2.

Thus, the lifting device 32 takes no damage in an uncontrolled operation of the motor, are in the lifting device according to the invention according to the Fig. 8 to 15 Switch 61, 62, 63 is provided, which prevents damage to the lifting device and - when using the lifting device in a nursing bed - certain dangerous for a bed occupant positions of the nursing bed. The switches 61, 62, 63 are actuated via a first actuating element 67 and a second actuating element 69, whereby the switches 61, 62, 63 interrupt the power supply to the motor 32 and turn off the lifting drive. The first actuator 67 and the second actuator 69 are mounted on a first rod at opposite ends. The first rod 60 is guided, on the one hand, in a guide bush 66 and, on the other hand, guided on a second rod 65, which engages in the first rod 60 and is fastened to the upper cross member 10. The first switch 61 and the second switch 62 are fixed with respect to the guide bush 66 such that both the first switch 61 and the second switch 62 can be triggered solely by the second actuator 69. The third switch 63, however, can be triggered only by the second actuator.

During extension of the lifting device connected to the upper cross member 10 second rod 65 is moved upward. The first rod 60 slides on the second rod 65 by gravity down until an unillustrated driver on the second rod 65, the first rod 60 pulls up. Then, the first rod 60 moves upward. A second spring 68, which is inserted between the guide bushing and the first actuating element 67, initially holds the first actuating element at a distance from the guide bush so that the third switch 63 is not actuated. However, if the rod 60 is further pulled upward in a further extension, the second spring 68 is compressed and the first triggering element acts on the third switch 63 and triggers this. As a result, the motor 32 is turned off. The highest position of the lifting device is reached.

When retracting the lifting device, the upper cross member 10 is lowered. Thereby, the second rod 65 and the first rod 60 is moved downward. If the lifting device has reached a middle position, the second actuating element 69 abuts against a first spring 64. This first spring holds the second actuator 69 at a distance from the guide bush and thus prevents actuation of the first or the second switch 61, 62. Only when the second rod is fully retracted into the first rod 60 and the upper cross member 10, the first rod opposite the spring pressure of the first spring 64 pushes down the second actuator 69 comes in the area of the first switch 61 and triggers this. The lifting device has then reached its lower position. In this lower position, the lifting device rests on the feet 71. If now the lifting device are brought into the rolling position, in which the feet 71 are lifted from the floor and the lifting device completely rests on the rollers 2, the interruption, by the first switch 61 was lifted. This can be done for example by an additional switch, in particular a key switch, which bridges the first switch 61. Such a device is for example in the publication with the publication number DE 41 43 182 C2 disclosed. If the first switch 61 is bridged, the lifting device can be moved further down, and that until the second actuator 69 triggers the second switch 62 and the motor 32 turns off again. The lifting device is now in the rolling position and can easily be moved to another location.

LIST OF REFERENCE NUMBERS

1

lifting device

2

roll

3

pivot bearing

4

roller carrier

5

lower cross member

6

middle cross member

7a

lower leg part of the first leg

8a

middle leg part of the first leg

9a

upper leg part of the first leg

7b

lower leg part of the second leg

8b

middle leg part of the second leg

9b

upper leg part of the second leg

10

upper cross member

11

first rope

12, 13

first pulleys to the first rope

14

second pulley to the first rope

15

third pulley to the first rope

16

fourth pulley to the first rope

17

first end of the first rope

18

second end of the first rope

19

pinch

20

drive roller

21

second rope

22, 23

first pulleys to the second rope

24

second pulley to the second rope

25

third pulley to the second rope

26

fourth pulley to the second rope

27

first end of the second rope

28

second end of the second rope

30

drive shaft

31

transmission

32

engine

33

gear

34

toothed belt

35

gear

36

wrap

37

retaining element

38

Winkelblech

39

screw

40

care bed

41

first edition part

42

second edition part

43

third edition part

44

fourth edition part

45

right frame part

46

left frame part

47

headboard

47a

footboard

48, 51

lower cover

49, 52

middle cover

50, 53

top cover

54

first side member

55

second side member

60

first pole

61

first switch

62

second switch

63

third switch

64

first spring

65

second pole

66

guide bush

67

First actuator

68

second spring

69

second actuator

70

base support

71

stand

Claims (19)

1. Lifting device (1) for beds, in particular for patient and nursing beds,

   - having a first leg (7a, 8a, 9a) which can be telescoped and a second leg (7b, 8b, 9b) which can be telescoped, which in each case have a stationary lower leg part (7a, 7b) and an upper leg part (9a, 9b) which is movable in relation to the former,

   - having at least one cross member (5, 6, 10) which interconnects the legs (7, 8, 9),

   - having a rotational drive (19, 20, 30 to 35) for the simultaneous length adjustment of the legs (7, 8, 9) of the lifting device (1),

   - having a first traction means (11) and a second traction means (21),

   - wherein a first end (17, 27) of the first traction means (11) or of the second traction means (21), respectively, is attached to the lower end of the upper leg part (9b, 9a) of the second leg (7b, 8b, 9b) or of the first leg (7a, 8a, 9a), respectively,

   - wherein a second end (18, 28) of the first traction means (11) or of the second traction means (21), respectively, is at least indirectly attached to the upper leg part (9b, 9a) of the first leg (7a, 8a, 9a) or of the second leg (7b, 8b, 9b), respectively, and

   - wherein the first traction means (11) and the second traction means (21) intersect one another in the region between the first leg (7a, 8a, 9a) and the second leg (7b, 8b, 9b),

   - wherein the lifting device has a first group of deflection rollers (12 to 16) and a second group of deflection rollers (22 to 26),

   - wherein the first traction means (11) is assigned the first group of deflection rollers (12 to 16) and the second traction means (21) is assigned the second group of deflection rollers,

   - wherein, by means of the rotational drive (19, 20, 30 to 35), the first traction means (11) or the second traction means (21), respectively, is drawable from the first leg (7a, 8a, 9a) to the second leg (7b, 8b, 9b) and vice-versa, so as, on account thereof, to displace the upper leg parts (9b, 9a) of the legs upwards or downwards in relation to the lower leg parts (7a, 7b),
   characterized in
   that the legs (7a, 8a, 9a; 7b, 8b, 9b) in each case have a central leg part (8a, 8b) which is in each case movable in relation to the lower leg part (7a, 7b) and the upper leg part (9a, 9b), that the first group of deflection rollers (12 to 16) comprises a third deflection roller (15) in the region of the lower end of the central leg part (8b) of the second leg, and
   that the second group of deflection rollers (22 to 26) comprises a third deflection roller (25) in the region of the lower end of the central leg part (8a) of the first leg.
2. Lifting device according to Claim 1, characterized in that the first group of deflection rollers (12 to 16) comprises at least one first deflection roller (12, 13) in the region of the lower end of the lower leg part (7a) of the first leg (7a, 8a, 9a).
3. Lifting device according to Claim 1 or 2, characterized in that the first group of deflection rollers (12 to 16) comprises a second deflection roller (14) in the region of the upper end of the lower leg part (7b) of the second leg (7b, 8b, 9b).
4. Lifting device according to one of Claims 1 to 3, characterized in that the second group of deflection rollers (22 to 26) comprises at least one first deflection roller (22, 23) in the region of the lower end of the lower leg part (7b) of the second leg (7b, 8b, 9b).
5. Lifting device according to one of Claims 1 to 4, characterized in that the second group of deflection rollers (22 to 26) comprises a second deflection roller (24) in the region of the upper end of the lower leg part (7a) of the first leg (7a, 8a, 9a).
6. Lifting device according to one of Claims 1 to 5, characterized in that the first group of deflection rollers (12 to 16) comprises a fourth deflection roller (16) in the region of the upper end of the central leg part (8b) of the second leg part.
7. Lifting device according to one of Claims 1 to 6, characterized in that the second group of deflection rollers (22 to 26) comprises a third deflection roller (25) in the region of the lower end of the central leg part (8a) of the first leg.
8. Lifting device according to one of Claims 1 to 7, characterized in that the second group of deflection rollers (22 to 26) comprises a fourth deflection roller (26) in the region of the upper end of the central leg part (8a) of the first leg.
9. Lifting device according to one of Claims 3 to 8, characterized in that the first traction means (11) runs from its second end (18) via the at least one first deflection roller (12, 13) of the first group, the rotational drive (19, 20, 30 to 35) and the second deflection roller (14) of the first group to the first end (17).
10. Lifting device according to Claim 9, characterized in that the first traction means (11), between the second deflection roller (14) of the first group and the first end (17), is guided via the third deflection roller (15) and the fourth deflection roller (16) of the first group.
11. Lifting device according to one of Claims 5 to 10, characterized in that the second traction means (21) runs from its second end (28) via the at least one first deflection roller (22, 23) of the second group, the rotational drive (19, 20, 30 to 35) and the second deflection roller (24) of the second group to the first end (17) of the second cable (21).
12. Lifting device according to Claim 11, characterized in that the second traction means (21), between the second deflection roller (24) of the first group and the first end (27), is guided via the third deflection roller (25) and the fourth deflection roller (26).
13. Lifting device according to one of the preceding claims, characterized in that the first traction means (11) and the second traction means (21) are drivable via a drive roller (20) of the rotational drive (19, 20, 30 to 35).
14. Lifting device according to Claim 13, characterized in that the drive roller (20) is drivable via a belt (34) from a drive shaft (30).
15. Lifting device according to Claim 14, characterized in that the drive shaft (30) extends from a transmission (31) which is drivable with a motor (32).
16. Lifting device according to Claim 13, characterized in that the first traction means (11) and the second traction means (21) are secured on the drive roller (20).
17. Lifting device according to one of the preceding claims, characterized in that the lifting device comprises a brake.
18. Lifting device according to Claim 17, characterized in that the brake decelerates the movement of the lifting device when retracting the legs (7, 8, 9).
19. Lifting device according to Claim 18, characterized in that the brake comprises a wrap spring (36).

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