EP0520267B1 - Method for controlling a lifting apparatus and lifting apparatus for handicapped persons - Google Patents

Abstract

Method for controlling a lifting apparatus (1) for handicapped people, for example a bathtub lift, comprising a seat plate (4) and a subframe (2) which supports the seat plate, and a preferably hydraulic lifting apparatus (tubular cylinder 3), two actuation knobs (5, 6) being let into the seat plate (4) adjacent to the actual seating surface, one of the knobs controlling the upward movement and the other one controlling the downward movement of the lifting apparatus for as long as it is pressed down. <IMAGE>

Description

The invention relates to a lifting device for people with reduced mobility, for insertion in a bathtub, with a seat plate and a support frame which supports the seat plate and with a hydraulic lifting device (hose cylinder).

In the known lifting devices of this type, either a lever control is provided, which can often not be operated by people with reduced mobility, or a cable control is provided which is easy to use, but with the risk that the free end containing the operating device slips out of your hand, falls and is then no longer palpable.

From FR-A-2 635 262 a lifting device has become known which contains a manually operated pneumatic lifting device, which is generally not operable by a disabled person.

The invention is therefore based on the object of designing such a lifting device in such a way that it is easy to operate, grants movement-impaired people a good hold during the entire use and thereby makes the use as comfortable as possible and ensures great operational reliability.

This object is achieved in that in the seat plate, in addition to the actual seat surface, two actuating buttons which are flush with the seat plate and which are pressed in are installed Act each position on a valve, which cause the upward and downward movement of the lifting device, and that the two actuating buttons are arranged one behind the other on a line running parallel to the articulation axis of two articulated side parts arranged on the seat plate, and that in the side part assigned to the control buttons a longitudinally displaceably mounted head is provided which, when the side part is folded onto the seat plate, is able to activate the respective actuation button.

On the one hand, these operating buttons cannot inadvertently get out of the reach of the disabled person and, on the other hand, stop the further movement of the lifting device as soon as they are released. The lifting device designed in this way works extremely safely and stops its movement as soon as an operating button is released, so that it cannot be unwanted to be transported further. The flush arrangement of the actuation buttons also prevents unwanted actuation by placing it on top. However, this also makes it possible to switch on the lifting device by simply folding the side panel in and to let it move into the respective end position without constantly pressing the actuation button.

Due to the slidable storage of the button, either the up or down movement can be switched on. The side parts themselves bring the advantage that jamming between the seat plate and bathtub is prevented.

A particularly advantageous development of the lifting device according to the invention is given in that the operating buttons built into the seat plate are connected directly to two valves, one of which is switched on between a water pipe and the lifting device (hose cylinder) and the other between the lifting device and a free outlet .

This ensures a particularly simple and reliable construction of the lifting device.

It is also very advantageous if, according to the invention, a fastening part in the form of a loop and a button or a bolt which can be inserted into a grommet is provided on the side part having the button.

This ensures that the side part is locked securely in its switched-on position.

According to a further advantageous embodiment of the invention it is provided that a rocker arm is mounted on the lifting device, which acts in the upper end position of the lifting device on a shut-off valve arranged in the water pipe and closes it.

A further advantageous development of the lifting device according to the invention is provided in that a backrest and a device for selectively adjusting the backrest inclination and a scissor-like base frame are provided, against which an attachment connected to the backrest can lie, the attachment with its upper in essentially vertically extending end is fastened in a rotatably mounted carrier (pivot bearing), in which the backrest also engages and with its lower end facing away from it slidably abuts the base frame.

The slidability can be achieved by appropriate shaping of the lower end.

However, it has also been found to be advantageous if, according to the invention, a cap-shaped sliding piece is placed on the lower end of the attachment resting on the base frame.

It is also advantageous if, according to the invention, the backrest has two supports directed downwards against a seat plate, each of which is removably inserted into a pivot bearing, and if downward levers are fastened in this pivot bearing, which are able to engage non-positively on struts of the underframe, and if so Holes are provided in the seat plate for receiving the supports of the backrest.

By simply repositioning the backrest, secure support is achieved in an upright posture of the upper body and, on the other hand, its automatic raising or lowering in accordance with the adjustment of the seat height.

It is also very favorable if, according to the invention, a plurality of bores lying one behind the other are provided for receiving the backrest supports, each with a different seat depth.

A further advantageous embodiment of the invention is that two pivot bearings, one behind the other in the axial direction and fastened to the seat plate of the seat device, are provided, in each of which a support for the backrest and a lever are fastened.

A further advantageous embodiment of the invention is that a valve arrangement and a spring-loaded valve body and an actuating plunger acting against this spring are provided, internal inlet and outlet lines being arranged transversely to the direction of movement of the valve body in the valve arrangement.

The force required to move the valve body is thus very low and a relatively weak spring load is sufficient, by means of which the valve body is brought into its closed position. To actuate the valve, only this slight spring load then has to be overcome, while the pressure medium to be controlled by the valve exerts no or only a very slight force on the valve body.

It is also particularly advantageous if, according to the invention, two parallel valves are arranged in a common valve housing, which have a connecting line running transversely to the direction of movement of the valve body, to which a line leading to a working cylinder is connected, and if diametrically to this connecting line to each of the two Valves an inlet or outlet line is connected.

This ensures that the pressure medium, regardless of the side from which it acts on the valve body, does not exert any force on the valve body in the direction of movement.

Another advantageous embodiment of the invention is that a rotatable and longitudinally displaceable seat plate and a support plate formed from individual chain-link-like parts connected to one another by hinges are provided.

It has also proven to be very advantageous if, according to the invention, the support plate has a recess which is reversely T-shaped in cross-section and runs over the individual sections, into which a corresponding attachment of an essentially circular seat plate engages.

In this T-shaped recess, the seat plate is guided cleanly in the longitudinal direction and can still be rotated easily. This configuration also enables a very low overall height, which is particularly advantageous when used for a bath tub lift, since the upper edge of the seat is close to the bath tub floor when the lift is in the drained state.

It is also very advantageous if, according to the invention, each of the sections is provided on both sides with two hinges aligned with one another.

This ensures high stability of the support plate.

A very advantageous embodiment of the invention is that the hinges are held together by a cylindrical pivot pin, which has a nose-shaped projection on its hinge-facing and tapered end, which engages in an annular groove and thereby the pivot pin in the hinge in the axial direction specifies.

Due to the tapered design, this end can deflect together with the nose-shaped projection when the pivot pin is inserted and then engages in the groove when fully inserted.

It has also proven to be very advantageous if, according to the invention, the top of the seat plate is provided with a circular depression which takes up almost the entire surface.

A soft underlay can be placed in this recess, which increases the seating comfort considerably.

It is also very favorable if, according to the invention, the outer edge of the seat plate is bevelled on its underside.

This prevents the seat plate from jamming on an edge of a section of the support plate during lateral displacement.

For the production of the support plate, it has proven to be very advantageous if, according to the invention, the parts of the support plate are made of plastic and are provided with recesses on their underside.

On the one hand, this enables considerable material savings to be achieved, which in turn prevents warping when the injection-molded plastic parts cool down.

A lifting device according to the invention is generally inserted into the bathtub in the flat, collapsed state and then raised so that a person can then sit on the lift or lift it up.

It has now been found that the lift, when it is raised without load and only then loaded, yields at least slightly, which is uncomfortable for the user.

According to a further advantageous embodiment of the invention, it is provided that a stop (182) for the upper end position, in which a limit switch (185) is provided for switching off the pressure medium, wherein a pressure cushion, a compression or tension spring or a similar pressure-building device is provided on the stop provided in the upper end position, against which the device moves when starting up.

As a result, an increased pressure builds up in the pressure bellows even when the lifting device is started up unloaded, so that there is no more sagging during subsequent loading.

It is also very advantageous if, according to the invention, the pressure cushion is arranged between the horizontally displaceable, rotatably mounted scissor arm of a scissor-like underframe and an end position stop assigned to the scissor arm.

This provides a particularly simple and inexpensive feasibility of the pressure cushion.

It is also very advantageous if, according to the invention, a foam cushion is provided as the pressure cushion.

A particularly simple embodiment is achieved if, according to the invention, the horizontally displaceable scissor arm is movably supported on a horizontal bottom rail which has a U-shaped cross-sectional profile open at the top and into which the pressure cushion is clamped.

Fig.1

eine schematische Darstellung einer Hubeinrichtung mit Steuerventilen und Betätigungsknöpfen,

Fig.2

eine Schnittdarstellung einer Sitzplatte mit daran angelenktem Seitenteil und den Betätigungsknöpfen für die Steuerventile und

Fig.3

einen Längsschnitt durch die Betätigungsknöpfe und Ansicht auf ein Seitenteil.

Fig.4

eine Ansicht eines teilweise dargestellten Untergestells eines Badewannen-Lifts an dem ein Ansatz anliegt, der mit einer Gleitkappe versehen ist

Fig.5

einen Längsschnitt durch eine Sitzeinrichtung und

Fig.6

einen Querschnitt durch die Sitzeinrichtung nach Fig.5,

Fig.7

eine Schnittdarstellung durch eine Ventilanordnung mit zwei Ventilkörpern,

Fig.8

eine Draufsicht auf eine Sitzeinrichtung mit einer Tragplatte und einer Sitzplatte,

Fig.9

eine Vorderansicht dieser Sitzeinrichtung,

Fig.10

eine Ansicht eines Teilstückes der Tragplatte von unten,

Fig.11

einen Vertikalschnitt durch die Sitzplatte, die auf der Tragplatte aufsitzt,

Fig.12

eine Ansicht eines Teils der Tragplatte mit deren Scharnierausbildung,

Fig.13

eine Seitenansicht eines Badewannenlifts in hochgefahrener Position,

Fig.14

einen Ausschnitt dieses Liftes in größerem Maßstab,

Fig.15

einen Schnitt durch eine auf dem Wannenboden aufliegende Schiene des Liftes und

The invention is illustrated in the drawing using several exemplary embodiments. Show:

Fig. 1

1 shows a schematic representation of a lifting device with control valves and actuating buttons,

Fig. 2

a sectional view of a seat plate with articulated side part and the actuating buttons for the control valves and

Fig. 3

a longitudinal section through the buttons and view of a side part.

Fig. 4

a view of a partially shown base frame of a bathtub lift on which an approach rests, which is provided with a sliding cap

Fig. 5

a longitudinal section through a seat and

Fig. 6

3 shows a cross section through the seat device according to FIG. 5,

Fig. 7

2 shows a sectional illustration through a valve arrangement with two valve bodies,

Fig. 8

a plan view of a seat device with a support plate and a seat plate,

Fig. 9

a front view of this seat device,

Fig. 10

a view of a portion of the support plate from below,

Fig. 11

a vertical section through the seat plate, which sits on the support plate,

Fig. 12

a view of part of the support plate with its hinge formation,

Fig. 13

a side view of a bathtub lift in the raised position,

Fig. 14

a section of this lift on a larger scale,

Fig. 15

a section through a rail of the lift resting on the tub floor and

1 in FIG. 1 denotes a lifting device, which consists of a support frame 2 and a hydraulic hose cylinder 3 engaging thereon. The support frame 2 consists of an upper and lower frame between which four scissors-like struts are arranged. On the upper frame is a seat plate 4, in which two actuating buttons 5 and 6 are embedded. These actuation buttons are each mechanically connected to a valve 7 or 8, which is closed in the rest position of the actuation button and opened in the pressed position. Both actuating buttons 5 and 6 are spring-loaded and return immediately to their initial position in which the valves are closed when released. The valve 7 used for starting up is connected to a water pipe 9, in the course of which a valve 10, which is also open in a normal manner, is provided. This valve 10 is engaged by a rocker arm 11 which is actuated by one of the scissor-like struts 12 in the upper end position of the lifting device 1, as a result of which the valve 10 is closed. A supply line 13 goes from valve 7 to the hose cylinder 3, whereby when the actuation button 5 is pressed this hose cylinder is acted upon with water and the lifting device is raised. The second valve 8 is also connected to this supply line 13, the discharge line 14 of which opens into the bathtub 15 in which the lifting device is located. To lower the seat plate 4 from the upper position, the actuation button 6 is pressed in, as a result of which the valve 8 opens and the water in the hose cylinder 3 drains into the bathtub 15. A mutual locking of the two operating buttons 5 and 6 is not necessary, since in the event of an accidental simultaneous actuation of both buttons, only the bathtub is filled with water, which can be switched off by simply releasing the button 6.

As shown in FIG. 2, a side part 16 is articulated on both sides of the seat plate 4, only one of which has been shown, however, and which serves for safety, in particular when the seat plate is raised, so that no body part can be pinched.

In this side part 16, a longitudinal slot 17 is provided, in which a button 18 is mounted for longitudinal displacement. When the side part is folded in until it rests on the seat plate 4, the button 18 in its respective end position in the longitudinal slot presses either the actuation button 5 or the actuation button 6, as a result of which the lifting device moves up or down. In order to secure this switching position of the side part 16, this carries a loop 19 which can be buttoned into a button 20 on the underside of the seat plate 4. Instead of this loop, a rubber grommet can also be inserted into the side part 16 and the seat plate 4, through which a connecting bolt can be inserted, in order to ensure the safe actuation of the two valves.

In the exemplary embodiment according to FIG. 4, 41 denotes a seat device which has a seat plate 42 has, which is mounted on a scissor-like base 43. A rotary bearing 44 is fastened to this seat plate 42 in a manner not shown, in which supports 45 of a backrest are inserted from above and a shoulder 46 is inserted from below. A cap 47 made of a slidable material is attached to the lower end of this extension 46, with which this extension lies against a strut of the base frame 43.

As soon as the seat height is lower and thus the underframe 43 is set to be flatter, the shoulder 46 which abuts the cap 47 also pivots and rotates the pivot bearing 44. As a result, the supports 45 of the backrest are also set to be flatter.

Due to the interposition of the cap 47, this inevitable adjustment both in the direction of "flat" and in the direction of "steeper" is very easy, although a great pressure between the end of the neck and the strut can arise when the backrest is raised due to a high contact pressure on the backrest .

In the embodiment according to FIG. 5, 51 designates a height-adjustable seat device as used as a bath tub lift. This seat device has a seat plate 52 which is mounted on a scissor-like base 53 and is adjustable in height. A pivot bearing 54 is fastened to the seat plate 52 and carries a support 55 of a backrest 56 in an upper bore and a lever 57 in a lower bore, of which the support 55 is arranged to be removable. The lever 57 rests on the lower frame 53 with a cap 58 made of slidable material, which cap is attached to its lower end and inevitably follows its movement when lowering and lifting the seat plate 52. In this case, the pivot bearing 54 is also rotated and the support 55 or the backrest 56 attached to it is made flatter or steeper. So that the support 55 is free can move, a corresponding elongated cutout 59 is provided in the seat plate 52. In addition, two vertical bores 60 and 61 are arranged in the seat plate, into which the support 55 can optionally be inserted, as a result of which the backrest then always assumes an upright position regardless of the seat height.

As can be seen from FIG. 6, two supports 55 are expediently arranged on the backrest 56, which in the exemplary embodiment shown are each inserted into a separate pivot bearing 54. Each of these two pivot bearings also carries a lever 57 which acts on the base frame in a manner not shown. Instead of the two separate pivot bearings, it is also possible to provide a common pivot bearing that extends over the entire width of the backrest and into which the two supports 55 are then inserted. If two levers 57 arranged in the vicinity of the supports are also provided, a relatively lightly designed pivot bearing can be provided, since no great torsional loads occur.

In the example shown in FIG. 7, 71 denotes a valve housing in which two valve bodies 72 and 73 aligned parallel to one another are displaceably mounted in vertically running bores 74 and 75. At the lower end of each of the two valve bodies, a spring 76 or 77 engages, which is able to press the valve body into its upper end position. At the upper end of the respective valve body, an actuating button 80 or 81 engages via a plunger 78, 79, with which the valve body can be brought into its lower end position. A bore 82 runs horizontally through the valve housing 71 and intersects the bores 74 and 75 and is provided at the respective outlet from the valve housing 71 with a connection 83, 84 for a hose line (not shown). A further bore 85 opens into this bore 82, which serves as a connecting line for the two valves. to which - in a manner not shown - a working cylinder can be connected.

If, for example, a supply line of a pressure medium is connected to the connection 84, which can be a water line when the valve is used in a bath tub lift, and the valve body 73 is brought into the position shown in the position in which the valve is open via the actuation button 81, so that Incoming water of the working cylinder is actuated and the bathtub lift is raised. After releasing the actuation button 81, the valve body is brought up into its closed position by the spring 77, whereby the water supply is shut off; however, the pressure applied remains and the bath lift remains in its raised position. When the actuating button 80 is pressed in, the valve body 72 is brought down from its closed position into its open position, as a result of which the pressure medium can escape via the connection 73; the work cylinder is relieved and the bath lift moves downwards when one person loads it. A line open at its other end is expediently connected to the connection 83, so that the water used as the pressure medium is discharged into the bathtub without splashing.

With 91 in Figure 8, a seat device is referred to, which consists of a support plate 92 and a seat plate 93. The support plate 92 consists of a plurality of sections 94 which are connected to one another in the manner of a chain link via hinges 95. For this purpose, each of the sections 94 is provided on its one long side with two projections 96, into which horizontally extending cylindrical openings 97 are made, which serve to receive a pivot pin 98. On the opposite long side, each section 94 is provided with two recesses 99, into which the projections 96 of an adjacent section fit. The sections lying to the side of this recess are also provided with cylindrical openings 100 for receiving the pivot pin 98. In the middle of the sections 94 of the support plate 92 there is provided a recess 101 which is reversely T-shaped in cross section and into which a correspondingly designed and likewise inverted T-shaped extension 102 of the seat plate 93 engages. The last of the sections 94 is provided within this recess with a pin 103 which prevents the attachment 102 from inadvertently slipping out of the recess 101. Instead of this pin 103, however, it is also possible to design the last section in each case without a recess and to insert the attachment in the folded-down state of this last section into the recess of the adjacent sections.

The pivot pin 98 is tapered at its end facing the hinge interior and has a nose-shaped projection 104 which engages in an annular groove 105 and thus secures the pivot pin 98.

The top of the seat plate 93 is provided with a circular depression 106, into which a soft base (not shown) can be placed, which is prevented from slipping by the edge 107 surrounding the depression. The outer edge 108 of the seat plate 93 is chamfered on the underside, so that the seat plate 93 can slide easily over any bumps at the transitions between the adjacent sections 94. To improve the dimensional stability and reduce the use of material, the plastic molded parts 94 are provided on their underside with recesses 109, so that only relatively narrow webs remain, which cannot warp significantly when cooling.

A bath tub lift is designated by 171 in FIG. 13, which is provided with a scissor-like base frame 172 which consists of two pairs of scissor arms 173 and 174, an upper pair of rails 176 fastened to a seat plate 175 and a pair of bottom rails 177 . The two scissor arms 173 are each rotatably supported via a joint 178 on the seat plate 175 or the upper pair of rails 176 and a joint 179 on the two bottom rails 177. The other pair of scissor arms 174 is articulated to an upper slide 180 and a lower slide 181. These slides 180 and 181 are longitudinally displaceably mounted in the respective rail 176, 177, which has a U-shaped cross section. As can be seen particularly from FIG. 14, each of the two lower rails 177 has a stop 182 against which a pressure cushion 183 bears. When the lift 171 is raised, which is done by a pressure bellows 184 connected to a pressure source, the slide 181 bears against these pressure pads and presses them together. Only when the pressure cushion 183 is fully compressed does the upper slide 180 reach a limit switch 185, via which the pressure source is switched off. By means of this pressure cushion 183, a higher pressure is built up in the pressure bellows 184 than would be necessary for raising the empty bath tub lift, so that the lift does not drop even when loaded later.

Claims (22)

1. Lifting unit (1, 41, 51, 91, 171) for putting people into a bathtub who are restricted in their movements, with a seat panel (4, 42, 52, 93, 175), a structure (2, 43, 53, 172) that acts as a support for the seat panel and a hydraulic lifting device (3, 184), wherein two control buttons (5, 6, 80, 81) that terminate flush with the top edge of the seat panel are provided in the seat panel next to the actual sitting area and in their pressed position each act on a valve (7, 8, 72, 73) and cause the lifting device to move upwards and downwards, wherein the two control buttons are located behind each other on a line extending parallel to the hinge axis of two side sections (16) that are hinged to the seat panel and wherein a button (18) that is supported to permit longitudinal movement is provided in the side section (16) assigned to the control buttons and is designed to activate the relevant control button when the side section (16) is folded into position on top of the seat panel.
2. Lifting unit according to claim 1, wherein the control buttons (5, 6) that are provided in the seat panel (4) are connected directly to two valves (7, 8), one of which is fitted between a water pipe (9) and the lifting device (hose cylinder 3), while the other one is fitted between the lifting device (3) and an open outlet (14).
3. Lifting unit according to claim 1 or 2, wherein an attachment device in the form of a loop (19) and a knob (20) or a projection that can be inserted into a socket is provided in the side section (16) with the button (18).
4. Lifting unit according to one of the previous claims, wherein a rocker arm (11) is provided in the lifting unit (1), which acts on a shut-off valve (10) located in the water pipe (9) and closes this valve when the lifting unit (1) is in its top end position.
5. Lifting unit according to one of the previous claims, wherein a backrest, an apparatus for adjusting the slant of the backrest as required and a scissor-shaped frame (45, 53) are provided and a projection (46, 57) connected to the backrest is provided to rest against this frame, where the projection (46, 57) is secured at its top end, that extends essentially vertically, in a pivoted support (pivoted bearing 44, 54), which the backrest also engages, and rests with its opposite bottom end against the frame (43, 53), along which it can slide.
6. Lifting unit according to claim 5, wherein a cup-shaped sliding element (47, 58) is located on the bottom end of the projection (46, 57) that rests against the frame (43, 53).
7. Lifting unit according to claim 5 or 6, wherein the backrest (56) has two supports (55) that point downwards towards a seat panel (52) and are inserted in a pivoted bearing (54) from which they can be removed, wherein levers (57) that project downwards are secured in this pivoted bearing (54) which are designed to rest non-positively against stanchions of the frame (53) and wherein holes (60, 61) are provided in the seat panel (52) to accommodate the supports (55) of the backrest (56).
8. Lifting unit according to claim 7, wherein a number of holes (60, 61) are provided behind each other to accommodate the backrest supports (55) varying the size of the sitting area.
9. Lifting unit according to claim 7 or 8, wherein two pivoted bearings (54) that are attached to the seat panel (52) of the seat (51) are provided behind each other in axis direction, in each of which one support (55) for the backrest (56) and one lever (57) are secured.
10. Lifting unit according to one of the previous claims, wherein a valve assembly, a spring-loaded valve body (72, 73) and an actuating tappet (78, 79) that acts against this spring (76, 77) are provided, with internal inlet and outlet ducts (82, 83, 84, 85) located inside the valve assembly at right angles to the direction of movement of the valve body (72, 73).
11. Lifting unit according to claim 10, wherein two parallel valves (72, 73) are located in a single valve housing (71) and have a connecting duct (82) which extends at right angles to the direction of movement of the valve bodies (72, 73) and to which a duct (85) leading to an operating cylinder is connected and wherein an inlet / outlet duct (83, 84) is connected to each of the two valves diametrically aligned with this connecting duct (82).
12. Lifting unit according to one of the previous claims, wherein a rotating and longitudinally movable seat panel (93) and a support structure (92) formed from individual sections (94) that are connected by hinges (95) resembling links in a chain are provided.
13. Lifting unit according to claim 12, wherein the support structure (92) has a cavity (101) with a cross-section in the shape of an upside-down T that extends across the individual sections (94), which a corresponding projection (102) of an essentially circular seat panel (93) engages.
14. Lifting unit according to claim 12 or 13, wherein each of the individual sections (94) is provided on both sides with two hinges (95) that align with each other.
15. Lifting unit according to claim 12, 13 or 14, wherein the hinges (95) are held together by a cylindrical pin (98) that has a nose-shaped projection (104) at its tapered end facing towards the inside of the hinges, which engages an annular groove (105) and thus fixes the pin (98) in the hinge (95) axially.
16. Lifting unit according to one of the claims 12, 13, 14 or 15, wherein the top of the seat panel (93) is provided with a circular depression (106) that occupies almost the whole of its surface.
17. Lifting unit according to one of the claims 12, 13, 14, 15 or 16, wherein the outside edge of the seat panel (93) is bevelled on the underneath.
18. Lifting unit according to one of the previous claims 12 to 17, wherein the individual sections (94) of the support structure (92) are provided on the underneath with openings (109).
19. Lifting unit according to one of the previous claims, wherein a stop (182) is provided for the top end position, at which a limit switch (185) is fitted to switch the pressure medium off, where a pressure pad (183), a pressure or tension spring or a similar apparatus for the exertion of pressure is provided at the stop (182) provided at the top end position, which the unit engages when it carries out its lifting movement.
20. Lifting unit according to claim 19, wherein the pressure pad (183) is located between the horizontally movable, pivoted scissor arm (174) of a scissor-shaped frame (172) and an end position stop (182) assigned to the scissor arm (174).
21. Lifting unit according to claim 19 or 20, wherein a foam plastic pad is provided as the pressure pad (183).
22. Lifting unit according to claim 20 or 21, wherein the horizontally movable scissor arm (174) is supported to permit movement in a horizontal base rail (177) which has a U-shaped cross-section with the open side facing upwards and in which the pressure pad (183) is wedged.

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