EP1543744A1 - Lifting device for beds - Google Patents

Abstract

The lifting device (1) has a rotary drive for simultaneously adjusting the length of the telescopic leg parts (7,8,9). Traction cables (11,21) which cross over in the region between the first and second leg part are connected by their first ends to the lower end of the upper leg part of the second leg and first leg and by their second ends (18, 28) to the upper leg part of the first leg and second leg. The traction cables are assigned to two groups of guide pulleys (12 to 16).

Description

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

Such a lifting device is known from the document DE 296 05 577 U1 known. This document discloses in particular in the figures 5 and 6 a lifting device with a first and a second telescopic leg, each leg being a fixed one Lower leg part and have a movable upper leg part. The legs are connected to each other via a cross member. Furthermore, the lifting device to a rotary drive for simultaneous length adjustment of the legs of the lifting device. For length adjustment by means of the rotary drive also uses a first and a second traction means. These are the traction means of the rotary drive over two in the lower leg part stationary mounted pulleys and one at the lower end of the led lower leg part mounted pulley. In the area between one of the two upper pulleys and the lower pulley is the traction means with both ends at a common Attachment point attached to the upper leg part. By a Pull movement on the traction means due to a rotation of the Rotary drive will then be the common point of attachment of the Traction means relative to the upper pulleys and the lower Deflection pulley shifted. As a result, the upper leg part in the moved lower leg part and the lifting device performs a Lifting motion off.

A disadvantage is that the lifting device described simple having telescopic legs. These are only relatively small Reachable heights.

From the document DE 91 10 687 U1, however, stand-alone double telescopic legs known. The in this document disclosed legs need for every two times telescopic leg at least two traction devices such as ropes, chains or V-belts. This leads to the fact that, provided that in the last-mentioned document disclosed dual telescoping legs in a device used according to the first-mentioned document, a total of four Traction means must be used. This has a considerable Assembly effort and design effort result, which it minimize applies.

The invention is therefore based on the object, a lifting device to propose, which is constructively simple, and whose legs without great additional engineering or assembly effort too can be performed twice telescopically.

This object is achieved by a lifting device solved according to claim 1. The according is at a Lifting device according to the invention a first end of the first Traction or the second traction means at the lower end of the upper Leg portion of the second leg or the first leg attached. One second end of the first traction means and the second traction means however, at least indirectly on the upper leg part of the first leg or the second leg attached. In addition, the first intersect Traction means and the second traction means in the region between the first and the second leg. Such a lifting device is to suitable, even with two or more telescopic legs to be executed, as it results, for example from claim 8.

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 Pulling means is pulled from the first leg or to the second leg and thereby the upper leg parts of the legs downwards or upwards be moved relative to the lower leg parts.

To further the function of the device according to the invention improve, the device can be a first group of pulleys and a second group of pulleys. The first Group of pulleys can the first traction means and the second group of pulleys associated with the second traction means be. The individual pulleys of the first group can be arranged in the lifting device as follows: At least a first pulley is in the region of the lower end of the lower Leg part of the first leg attached. A second pulley the first group of pulleys can be in the area of the upper end be attached to the lower leg portion of the second leg. The second Group of pulleys can at least a first pulley in Area of the lower end of the lower leg part of the second leg while a second pulley in the area of the upper End of the lower leg portion of the first leg can be attached.

In a device according to the invention then the first Traction means from its second end on the at least one first Deflection pulley of the first group, the rotary drive and the second Deflection pulley of the first group to the first end of the first rope run. Similarly, the second traction means of its second End over the at least one first pulley of the second group the rotary drive and the second pulley of the second group be led to the first end of the second traction means.

A device according to the invention can also be twofold telescopic legs to provide a larger stroke to achieve a compact construction. These include the legs each a middle leg part, respectively to the lower leg part and the upper leg part is movable. The first group of pulleys then advantageously comprises a third deflection roller in the region of lower end of the middle leg part of the second leg. Of Further, the first group of pulleys a fourth Include pulley, which is in the area of the upper end of the middle Leg part of the second leg part is arranged. Similarly, the second group of pulleys a third pulley in the area of the lower end of the middle leg part of the first leg and advantageously a fourth deflection roller in the region of the upper end of the middle leg part of the first leg.

In such a lifting device with double telescopic Legs, the first traction means between the second pulley the first group and the second end via the third pulley and the fourth guide roller be guided. In an analogous way, the second traction means in such a lifting device between the second pulley of the first group and its second end over be guided, 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 are the Lifting device with only one traction means such as a rope, a chain or a V-belt in their length adjustable.

The first traction means and the second traction means a Lifting device according to the invention can via a drive roller be driven by the rotary drive. It is possible that the first and the second traction means in frictional connection with the drive roller stand and the frictional connection is sufficient that the force from the drive roller on the Traction means are transmitted to the traction means in one or in the to draw another direction. Thus an effective frictional Connection between the drive roller and the traction means is prepared, the traction means preferably loop around several times Drive roller.

In an alternative embodiment, the traction means on the Drive roller to be determined for example by clamping. This For example, via a radial bore through the Drive roller carried by which the traction means passed are. 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 directly from a drive shaft However, it is also possible that the Drive roller driven by a drive shaft via a belt becomes. The drive shaft is preferably of a transmission led out, which is driven by a motor.

A lifting device according to the invention may comprise a brake, preferably the movement of the lifting device during retraction slows down the legs or sagging of the moving parts of the Lifting device prevents standstill of the rotary drive. is a brake not provided, acts in addition to that of the drive applied force for retracting the legs also gravity, whereby the retraction movement of the legs are greatly accelerated can. It acts in addition to the gravity of the moving parts optionally also the gravity of the lifting device Bed frame and a person lying in bed. A brake has the advantage of being against gravity moving parts of the Lifting device, the mattress frame and on the bed lying person acts and so at a standstill of Lifting a sagging of the lifting device through the Gravity prevents.

The brake of a lifting device according to the invention can be a Have wrap. The wrap spring is on the drive shaft put on and at the same time with one end at one not attached rotating part that when extending the Lifting device, the wrap is opened and the drive free turn, while at a retract the wrap spring is closed and the drive and the acting gravity against the power of the twisted wrap must work.

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 Figure 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 in the retracted state,

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. 1 to 3,

Fig. 5

shows a side view of the bed of FIG. 4,

Fig. 6

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

Fig. 7

shows a view of both longitudinal beams connected lifting devices of the bed of FIG. 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 of FIG. 8 along the line IX-IX in the extended state,

Fig. 10

shows a section through the lifting device of 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 FIG. 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 FIG. 8 to 12 with the upper cross member removed,

Fig. 14

a detail of FIG. 13 according to XIV-XIV and

Fig. 15

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

The nursing bed shown in Figures 4 to 6 has two Lifting devices comprising double telescoping legs. The individual limbs of the legs (leg parts) of a lifting device are covered by covers 48 to 53. The footend side Lifting device has for this purpose a lower cover 51, a middle Cover 52 and an upper cover 53. The headend side Lifting device is by a lower cover 48, a middle Cover 49 and a top cover 50 hidden. The two Lifting devices 1 are longitudinal members 54, 55 with each other connected by those in Fig. 4, only the side rail 54 recognizable is. At the upper ends of the lifting device is a frame of Care beds attached, consisting of a right frame part 45, a left frame part 46 and a Fußendteil 47a and a Head end 47 consists. On the frame is a support surface for a mattress arranged, which by the support parts 41, 42, 43, 44 is formed. A first support part 41 serves to support the Hull of a bed occupant and is preferably height adjustable educated. The foot-end support parts 43, 44 are also preferably formed adjustable and serve to support the Thigh or lower leg of a bed occupant. The bed according to the figures 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 47 a and the Support parts 41, 42, 43, 44 shown. Therefore remain the over the longitudinal members 54, 55 interconnected lifting devices 1, which are of similar design and hereinafter based on the Figures 1 to 3 will 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 displaceable are. The rollers 2 are pivotally about a pivot bearing 3 at a Roller carrier 4 attached.

The lifting devices 1 each have a first and a second Double telescopic leg, each with a lower leg portion 7a, 7b, a middle leg part 8a, 8b and an upper leg part 9a, 9b. The lower leg part 7a of the first leg is above a lower one Cross member 5 and a middle cross member 6 with the lower Leg part 7b of the second leg like a frame firmly connected. At the Outside of the lower leg portion 7a of the first leg and the Leg part 7b of the second leg are the roller carriers 4 of the rollers 2 appropriate.

The lower leg part 7a of the first leg and the lower leg part 7b of the second leg are substantially tubular. Of the Inner diameter of the lower leg portion 7a of the first leg and the lower leg portion 7b of the second leg is dimensioned so 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 Leg slidable in the lower leg portion 7b of the second leg is stored.

Also the middle leg part 8a of the first leg and the middle one Leg part 8b of the second leg are tubular. The middle leg parts 8a, 8b each have one Inner diameter, which is such that the upper leg part 9a of the first leg and the upper leg part 9b of the second leg in FIG the respective middle leg part 8a, 8b of the first and the second Leg is slidable. The upper ends of the upper leg parts 9a, 9b Incidentally, with an upper cross member 10 fixed to each other connected. This allows the first and second leg only extended or retracted parallel to each other.

At the lower end of the lower leg part 7a, 7b of the first leg or the second leg is on the inside, that is between the Walls of the respective leg portion 7a, 7b an outer first Deflection pulley 12, 22 attached. To this outer first pulley 12, 22 is offset inward immediately outside the respective lower leg part 7a, 7b an inner first guide roller 13, 23 on the attached lower carrier 5. Further, second pulleys 14, 24 at the middle cross member 6 immediately adjacent to the upper Ends of the lower leg portions 7a, 7b attached. Besides, are on the lower ends of the middle leg parts 8a, 8b third pulleys 15, 25 attached, said third guide rollers 15, 25 so on the middle leg parts 8a, 8b are fixed in one inside longitudinal slot of the lower leg portions 7a, 7b are guided. Finally, fourth pulleys 16, 26 at the upper ends of middle leg parts 8a, 8b mounted, this fourth Deflection rollers 16, 26 within the lower ends of the upper leg parts 9a, 9b dive. To attach this fourth pulleys 16, 26th the middle leg parts 8a, 8b have a tube which 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 that is smaller than the inner diameter of the upper leg portions 9a, 9b, so this concentric at the lower end of the middle leg parts 8a, 8b fixed pipe in the retracted state of the lifting device 1 in the upper leg parts 9a, 9b can dip.

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

The lifting device 1, as shown in Figures 1 to 3 is completed by a first cable 11 and a second cable 21. These ropes 11, 21 are each a group of pulleys associated with the first cable 11, the outer first pulley 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 the second rope 21st is assigned, counts the outer first guide roller 22, the inner first Guide roller 23, the second guide roller 24, the third guide roller 25th and the fourth guide roller 26.

The first cable 11 is as follows in the lifting device arranged. With a first end 17, the first rope 11 is on attached lower end of the upper leg portion 9b. Starting from there it is guided up to the fourth guide roller 16. By the Deflection pulley, the first rope 11 undergoes a reversal of direction down to the third guide roller 15 at the lower end of the middle leg portion 8b is attached. Again, the first rope 11 deflected by 180 °, so the following up to the second guide roller 14 extends. From the second guide roller 14th Starting from the first cable 11 several times around the drive roller 20th out, from which the first rope on the pinch roller 19 to the inner first guide roller 13 is guided. From the inner first Guide roller 13, the first rope then runs horizontally to the outer first guide roller 12 from which the first rope after is guided above, with its second end 18 at the top Cross member 10 to be attached.

The second rope 21 is substantially mirror-inverted to the first rope 11 arranged, it via the pulleys of the second group of pulleys 22, 23, 24, 25, 26 is guided. Accordingly, that is first end 27 of the second cable 21 at the lower end of the upper Leg part 9a attached. From there it goes up to the fourth Deflection pulley 26, the second rope 21 down to the third Guide pulley 25 leaves, which the second rope 21 again by 180 ° deflects. Then, the second cable 21 becomes the second guide pulley 24 guided. The second cable 21 leaves the second guide pulley 24 horizontally to the middle of the middle cross member 6, then several times to be guided around the drive roller 20. From the drive roller 20 is the second rope 21 then to the inner first roller 23 and from there out to the outer first roller 22. The outer first Pulley 22 then leaves the second rope 21 upwards to analogous to the first cable 11 with its second end 28 on the upper cross member 10 to be attached.

By a rotation of the drive roller 20 due to a Commissioning of the motor 32, depending on the direction of rotation first rope 11 from the second deflection roller 14 to the first inner Deflection pulley 13 and at the same time the second rope 21 from the first inner roller 23 moves to the second guide roller 24 or vice versa. It is used to transmit the torque of the Drive roller 20 on the first cable 11 and the second cable 21st only between the respective rope 11, 21 and the Drive roller 20 effective frictional force exploited. This frictional force is by the multiple wrapping of the drive roller 20 through the first rope 11 and the second rope 21 increases. The pressure roller 19 It has the task that over the first cable 11 and das second rope 21 acting on the drive shaft 30 (radial) forces are symmetrical against each other, and so cancel. This makes it possible, the drive shaft only in the transmission 31st to store. In an advantageous embodiment of a Lifting device according to the invention this is also implemented. However, it is also possible, omitting the pressure roller 19 the first cable 11 from the inner first guide roller 13 immediately to lead to the drive roller 20. But then it is necessary that the drive shaft 30 not only in the transmission 31 but also is stored with its opposite end.

By a rotation of the drive roller 20 counterclockwise is the first rope 11 of the first leg 7a, 8a, 9a in the direction of second leg 7b, 8b, 9b pulled. At the same time, the second rope 21 in the opposite direction, that is, from the second Leg 7b, 8b, 9b to the first leg 7a, 8a, 9a moves. This leads an extended lifting device, as shown in Fig. 1, to the fact that the cross member 10 by shortening the Rope portion between the second end 18 of the first cable 11th and the second end 28 of the second cable 21 and the respective outer first pulleys 12, 22 is shortened. The crossbeam is pulled down by it. The by pulling down the Cross member 10 between the second end 18 and 28 and the outer first pulleys 12 and 22 won rope length is by the movement of the drive roller 20 in the direction of the second Pulleys 14 and 24 pulled. By the downward movement of the Cross member 10, the lower end of the upper leg portions 9a, 9b after moved down and the upper leg parts 9a, 9b dive into the middle Leg parts 8a, 8b. This increases the distance between the lower end of the upper leg portions 9a, 9b at which the first Ends of the first cable 11 and the second cable 21 are attached, and the fourth pulleys 16 and 26, respectively. The extension of the Distance corresponds exactly to the length by which the Distance between the upper cross member 10 and the outer first Pulley shortened. By the pulling movement on the first cable 11 or the second rope 21 is the shortened by the Distance between the second end 18 and 28 and the first outer pulley 12 and 22 won rope length through the Enlargement of the distance between the first end 17 and 18, respectively the ropes 11, 21 and the fourth roller 16 and 26 consumed.

Is after a certain time of rotation of the drive roller 20 against in the clockwise direction, the lower end of the upper leg parts 9a, 9b completely immersed in the middle leg parts 8a, 8b and at the same time the upper end of the middle leg portions 8a, 8b on the Cross member 10 struck, is no more relative movement between the upper leg parts 9a, 9b and the middle leg parts 8a, 8b possible. However, the drive motion is through the engine 32 continues and the drive roller 20 continues to turn against clockwise, sets a relative movement between the middle leg parts 8a, 8b and the lower leg parts 7a, 7b. By continuing Zugbewegung the first cable 11 of the first leg 7a, 8a, 9a and the second leg 7b, 8b, 9b of the second rope 21 from the second leg 7b, 8b, 9b to the first leg 7a, 8a, 9b, the cross member 10 is pulled further down. there the middle leg parts 8a, 8b dip into the lower leg parts 7a, 7b one. The by shortening the distance of the cross member 10 and The outer length of the first roller 12, 22 won rope length is then by increasing the distance between the second Deflection rollers 14, 24 and the third pulleys 15, 25 compensated.

Incidentally, it is also possible that during the retraction of the Lifting device 1, first, the middle leg parts 8a, 8b in the lower leg parts 7a, 7b are moved before the upper Leg parts 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.

But turns especially in a retracted Lifting device (Fig. 2), the drive roller 20 in the clockwise direction, is the first cable 11 from the second leg 7b, 8b, 9a towards the first leg 7a, 8a, 9a pulled. At the same time, the second rope 21 from the first leg 7a, 8a, 9b in the direction of the second leg 7b, 8b, 9b pulled. By the pulling movement of the first cable 11, of the second leg 7b, 8b, 9b to the first leg 7a, 8a, 9a shorten successively or simultaneously the distances between the one hand second guide roller 14 and the third guide roller 15 and the Others between the third guide roller 15 and the fourth Deflection pulley 16. By the simultaneous pulling movement of the second Rope 21 will be 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 shortened. This moves the upper cross member 10 up and the lifting device 1 is extended. The by the pulling movement of the ropes 11, 21 and the Shortening the distances between the respective second Deflection pulley 14 or 24 and the third deflection roller 15 and 25, respectively on the one hand and the respective third guide roller 15 or 25 and the respective fourth guide pulley 16 and 26 on the other hand won Rope length is increased by increasing the distance between the second end 18, 28 of the first cable 11 and the second cable 21st and the outer first pulleys 12, 22 compensated.

The invention shown in Figures 8 to 15 Lifting device corresponds in its basic structure of Lifting device according to the figures 1 to 3. There are therefore parts of second lifting device according to the invention with the same Reference numerals provided as parts of the first lifting device according to of Fig. 1 to 3, when these parts in the function of each other correspond. In particular, the construction of the legs of the second Lifting device is so similar to the structure of the legs according to the first lifting device, so that with respect to the construction of the legs up the description is referenced to Figs. 1 to 3.

Also the guidance of the first rope 11 and the second rope 21 at the lifting device according to the figures 8 to 15 corresponds to Essentially the cable guide in the lifting device according to FIG. 1 to 3. The main difference in rope guidance lies in that in the lifting device according to FIGS. 1 and 2, the second end 18 of the first cable and the second end 28 of the second cable 21 is arranged between the two legs and not like the Lifting device according to FIGS. 1 and 2 on the outside of the two Legs. This eliminates the two groups of roles outer first roller, about which in the lifting device according to the 1 to 3, the first cable 11 and the second cable 21st are deflected upwards. In the lifting device according to FIG. 8 to 15, the first rope 11 and the second rope 21 become immediate from the then single first roller 12 and 22 upwards diverted.

By this arrangement of the second ends 18, 28 of the first cable 11th or the second rope 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 FIGS. 8 to 15 is thereby even more compact.

The lifting device according to FIGS. 8 to 15 is additionally also thereby more compact than the lifting device according to FIGS. 1 to 3, that the motor 32 and the transmission 31 between the two legs 7, 8, 9 is arranged horizontally. In contrast, at the Lifting device according to FIGS. 1 to 3 of the motor 32 and the transmission 31 at least partially in an area outside the room arranged between the two legs 7, 8, 9, as it is also good recognize from the representation of the nursing bed according to FIGS. 4 to 7 can.

By the other arrangement of the engine 32 and the transmission 31 and the now different 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 is led out of the transmission 31, 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 with the toothed belt 34th engaged. The drive roller 20 has, in contrast to the Drive roller 20 of the lifting device according to FIGS. 1 to 3 two radial bores. Through these radial holes in the Drive roller is the first rope 11 and the second rope 21 passed. The ropes 11, 21 buckle after their exit the radial bores at a substantially right angle and are thus determined by clamping in the bore. The one by the Radial bores guided portion of the cables 11, 21 can thus not be unwound from the drive roller 20. So that Rope length of the first rope 11 and the second rope 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 rope length are unwound from the drive roller 20 can or that the excess rope length on the Drive roller 20 can be wound up.

The lifting device according to FIGS. 8 to 15 has a brake, which slows down the retraction of the lifting device and thereby in particular the on the moving parts of the lifting device compensated for acting gravitational forces. This makes it possible for the Lifting device at approximately the same speed retract as it can be extended. The brake provides Furthermore, that the extended lifting device at standstill of Motors 32 not due to on the moving parts of the Lifting forces acting without putting the motor 32nd sags down.

As a brake, the lifting device according to FIGS. 8 to 15 advantageously a wrap spring 36. This wrap 36 is with one end fixed to a holding element 37, the part of a Angle plate 38 is. This angle plate 38 is connected by screws 39 attached to the lower cross member 5 of the lifting device. The Wrap 36 is thus at one end to the lower cross member 5 and thus the lower two parts 7a, 7b established. The wrap spring is from the drive shaft 30th penetrated. The wrap spring 36 is so close to the Drive shaft 30 that, depending on the rotation of the drive shaft 30 the Wrap closed or open. The lifting device according to FIGS. 8 to 15 is arranged so that at a Retracting the lifting device causing rotational movement of the Drive shaft 30, the wrap spring 36 is closed and the engine 32 against the force applied by the wrap 36 force got to. Even when the motor 32, the wrap spring 36 is so close to the drive shaft 30, that when pressed the Lifting device without putting the motor 32 against the force the wrap spring 36 must be worked. Will, however, the engine 32 so put into operation that the lifting device extended is the rotation of the drive shaft 30 causes an opening of the Wrap spring 36. The drive shaft 30 is thereby substantially free from a force by the wrap, so that the Drive shaft 30 basically free from the wrap 36th can turn. The brake thus acts in the extension of the Lifting device not.

Another difference between the lifting device according to FIG. 1 to 3 and the lifting device according to FIGS. 8 to 15 is in the Attaching the rollers 2 to the through the legs 7, 8, 9 and the upper cross member 6 and the lower cross member. 5 formed frame. While the rollers 2 in the lifting device according to FIGS. 1 to 3 via a roller carrier 4 directly on the Are mounted frame, the roller carrier 4 in the lifting device according to the Fig. 8 to 15 with respect to the frame in height adjustable. The rollers 2 are at the lower end of a tubular Roller carrier 4 attached. This roller carrier 4 is in a socket a stand carrier 70 mounted vertically adjustable. at the same time are attached to the base support 70 feet 71, on which the bed normally rests. Should the bed be moved, the lifting device must be completely retracted to a Rolling position to be brought. When retracting the lifting device the upper cross member 10 strikes at the upper end of the roller carrier 4 at. 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 relative to the pedestal carrier 70 after is pressed down. The roller carrier 4 is characterized by the bottom of the Stand carrier 70 pushed out. The pushing out of the Roller carrier 4 and the associated rollers causes the Lift feet 71 off the ground. The bed is then in a rolling position and can easily on the rollers. 2 be moved.

So that the lifting device in an uncontrolled operation of the Motors 32 takes no damage, are in the inventive Lifting device according to FIGS. 8 to 15 switches 61, 62, 63 provided, which damage the lifting device and - at a use of the lifting device in a nursing bed - certain for a bed occupant prevents dangerous positions of the nursing bed. The switches 61, 62, 63 are in this case via a first Actuator 67 and a second actuator 69th operated, whereby the switches 61, 62, 63, the power supply to the Stop motor 32 and switch off the lifting drive. The first Actuator 67 and the second actuator 69 are attached to 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 on a second bar engaging in the first 60 Rod 65 out, which is attached to the upper cross member 10. Of the first switch 61 and second switch 62 are so with respect to Guide bush 66 attaches that both the first switch 61 and also the second switch 62 exclusively by the second Actuator 69 can be triggered. The third switch 63, however, can only by the second Actuator be triggered.

When extending the lifting device with the upper Cross member 10 connected second rod 65 moves upward. The first rod 60 slides on the second rod 65 due to the Gravity down until an unillustrated driver at the second rod 65, the first rod 60 pulls up. Then moved also the first rod 60 upwards. A second spring 68, the between the guide bushing and the first actuating element 67 is used, initially holds on the first actuator Distance to the guide bush, so that the third switch 63 is not is pressed. However, if the rod is extended further Further pulled upward, the second spring 68 compressed and the first triggering element acts on the third switch 63 and triggers this. As a result, the engine 32 off. The highest position of the lifting device is reached.

When retracting the lifting device, the upper cross member 10th lowered. As a result, the second rod 65 and the first Rod 60 moves down. Has the lifting device a medium Reached position hits the second actuator 69 at a first spring 64 on. 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 completely into the first rod 60th retracted and the upper cross member 10, the first rod against the spring pressure of the first spring 64 pushes down comes the second actuator 69 in the region of the first Switch 61 and triggers this. The lifting device then has its reached lower position. In this lower position rests the Lifting device on the feet 71st If now the lifting device in the rolling position are brought, in which the feet 71 of Floor are raised and the lifting device completely on the Roll 2 rests, the interruption must pass through the first switch 61 was lifted. This can for example, by an additional switch, in particular a Key switch done, which bridges the first switch 61. Such a device is for example in the document with the publication number DE 41 43 182 C2 discloses. Is the first Switch 61 bridged, the lifting device can continue down be driven until the second Actuator 69 triggers the second switch 62 and the Motor 32 switches off again. The lifting device is now in Rolling position and can easily be moved to another location become.

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 (23)

Lifting device (1) for beds, in particular for hospital and nursing beds with a first telescopic leg (7a, 8a, 9a) and a second telescopic leg (7b, 8b, 9b), each having a fixed lower leg part (7a, 7b) and a movable upper leg part (9a, 9b), with at least one cross member (5, 6, 10) connecting the legs (7, 8, 9) together, with a rotary drive (19, 20, 30, to 35) for the simultaneous length adjustment of the legs (7, 8, 9) of the lifting device (1), with a first traction means (11) and a second traction means (21), wherein a first end (17, 27) of the first traction means (11) and the second traction means (21) at the lower end of the upper leg portion (9b, 9a) of the second leg (7b, 8b, 9b) and the first leg ( 7a, 8a, 9a) is attached, wherein a second end (18, 28) of the first traction means (11) and the second traction means (21) at least indirectly on the upper leg portion (9b, 9a) of the first leg (7a, 8a, 9a) and the second leg (7b , 8b, 9b) and is wherein the first traction means (11) and the second traction means (21) intersect each other in the area between the first leg (7a, 8a, 9a) and the second leg (7b, 8b, 9b). Lifting device according to claim 1, characterized in that the lifting device comprises a first group of deflection rollers (12 to 16) and a second group of deflection rollers (22 to 26) Lifting device according to claim 2, characterized in that the first traction means (11) is associated with the first group of deflection rollers (12 to 16) and the second traction means (21) is associated with the second group of deflection rollers. Lifting device according to claim 3, characterized in that the first group of deflection rollers (12 to 16) comprises at least a first deflection roller (12, 13) in the region of the lower end of the lower leg portion (7a) of the first leg (7a, 8a, 9a) , Lifting device according to claim 3 or 4, 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). Lifting device according to one of claims 3 to 5, characterized in that the second group of deflection rollers (22 to 26) at least a first deflection roller (22, 23) in the region of the lower end of the lower leg portion (7b) of the second leg (7b, 8b , 9b). Lifting device according to one of claims 3 to 6, characterized in that the second group of deflection rollers (22 to 26) has 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). includes. Lifting device according to one of claims 1 to 7, characterized in that the legs (7a, 8a, 9a; 7b, 8b, 9b) each have a central leg part (8a, 8b), which in each case to the lower leg part (7a, 7b) and the upper leg part (9a, 9b) is movable. Lifting device according to claim 8, characterized in 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 middle leg portion (8b) of the second leg. Lifting device according to claim 8 or 9, 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. Lifting device according to one of claims 8 to 10, 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 portion (8a) of the first leg. Lifting device according to one of claims 8 to 11, 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 portion (8a) of the first leg. Lifting device according to one of claims 5 to 12, characterized in that the first traction means (11) from its second end (18) via the at least one first guide roller (12, 13) of the first group, the rotary drive (19, 20, 30 to 35) and the second guide roller (14) of the first group to the first end (17). Lifting device according to claim 13, characterized in that the first traction means (11) between the second guide roller (14) of the first group and the first end (17) over the third guide roller (15) and the fourth guide roller (16) of the first group out is. Lifting device according to one of claims 7 to 14, characterized in that the second traction means (21) from its second end (28) via the at least one first guide roller (22, 23) of the second group, the rotary drive (19, 20, 30 to 35) and the second pulley (24) of the second group extends to the first end (17) of the second cable (21). Lifting device according to claim 15, characterized in that the second traction means (21) is guided between the second deflection roller (24) of the first group and the first end (27) via the third deflection roller (25) and the fourth deflection roller (26). Lifting device according to one of the preceding claims, characterized in that the first traction means (11) and the second traction means (21) via a drive roller (20) of the rotary drive (19, 20, 30 to 35) can be driven. Lifting device according to claim 17, characterized in that the drive roller (20) via a belt (34) by a drive shaft (30) is drivable. Lifting device according to claim 18, characterized in that the drive shaft (30) is led out of a gear (31) which is drivable with a motor (32). Lifting device according to claim 17, characterized in that the first traction means (11) and the second traction means (21) on the drive roller (20) are fixed. Lifting device according to one of the preceding claims, characterized in that the lifting device comprises a brake. Lifting device according to claim 21, characterized in that the brake brakes the movement of the lifting device during retraction of the legs (7, 8, 9). Lifting device according to claim 22, characterized in that the brake comprises a wrap spring (36).

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