EP0520137A1 - Stage platform for composing theatre scenes or the like - Google Patents

Abstract

A vertically adjustable platform trestle for constructing theatre stages or the like has a platform (1), carried by scissor-type lifting members (5), and a motor-driven spindle drive (50) acting on the movable scissor-leg ends (12) and intended for raising the scissor-type lifting members (5). So that the platform trestle can be raised without any problems from a very low base level, an auxiliary lifting device (51) which can likewise be driven by the spindle drive (50) is arranged in the centre of the platform trestle. When the spindle drive (50) is switched on in the basic position of the platform trestle, the lifting device (51) first of all raises only the platform trestle by an initial height of lift, in the course of which the spindle drive (50) runs idle at the movable scissor-leg ends (12). The spindle drive (50) acts on the movable scissor-leg ends (12) only towards the end of the initial height of lift, whereas the auxiliary lifting device (51) then runs idle. <IMAGE>

Description

The invention relates to a pedestal for the construction of theater stages, grandstands or the like., With a platform carried by lifting scissors and with at least one motor driven, parallel to the platform directed spindle for erecting the lifting scissors, each spindle carries a spindle nut and one of each Each scissor's scissor arm is articulated to a spindle nut.

To build theater stages or the like. A variety of such. B. from DE-OS 29 41 912 A1 known pedestals directly attached to each other. In order to be able to stack the pedestals in a space-saving manner when not in use, the aim is to keep the basic height to which a pedestal can be lowered as small as possible. The same requirement is placed on such pedestals if they are to be used to permanently occupy a hall floor. The lower the basic height of the pedestals, the better it is to adapt to adjacent floor areas, e.g. B. of corridors or entrance areas possible. In the case of pedestals that are folded very flat, in which, in extreme cases, the scissor legs are parallel to one another, starting up via a spindle drive is extremely problematic, since in such a case the scissor legs do not yet offer a lever arm for attacking the adjusting spindle. It is known (EP 0 034 221 B1) to provide pedestals with a starting aid in the form of prestressed compression springs, but this starting aid is not very effective.

The invention has for its object to provide a generic pedestal that can be folded into a very flat basic position and raised from its basic position with relatively little effort.

To solve this problem, the invention provides that the motor and the spindle are arranged together on a slide which is guided in the direction of the spindle nut until it hits a stop, that an auxiliary lifting device on the slide and on an ascending part of the pedestal is formed, which translates the horizontal movement of the carriage into a lifting movement of the pedestal, that when the motor is switched on in the flat basic pedestal position, the carriage moves towards the spindle nut acting as an abutment and thereby raises the lifting scissors by an initial path via the auxiliary lifting device and that after When the slide hits the stop, the spindle nut runs towards the slide while the lifting scissors are further raised. The auxiliary lifting device can preferably consist of an inclined ramp and a ramp element, which are arranged on the scissor legs and the slide.

The task of the invention can also be solved with a height-adjustable pedestal, in which, in contrast to the pretreated embodiment, the drive motor for the spindle drive is fixedly mounted on the pedestal.

In such a pedestal to provide the object according to the invention is provided that in the middle of the pedestal below the platform is also an auxiliary lifting device that can be driven by the motor-driven spindle drive, that the spindle drive when the motor is switched on in the flat basic pedestal position initially only actuates the auxiliary lifting device , which raises the pedestal by an initial stroke, during which the attack of the spindle drive on the movable scissor leg ends is idle, and that only towards the end of the initial phase the spindle drive acts on the horizontally movable scissor leg ends and further raises the pedestal, during which time the auxiliary -Lifting device runs empty.

The invention provides a number of advantages. On the one hand, the pedestal can now be designed with a minimum basic height, so that it fulfills the requirements for a low stacking height, or for a low application height when a hall floor is subsequently occupied. Thanks to the auxiliary lifting device, the pedestal can be safely and reliably raised from its lowest position with little effort and can also be lowered back into its basic position in a controlled manner. When using a self-locking motor gear and a self-locking spindle thread or when using a self-locking stepper motor, the pedestal can be continuously adjusted to any desired height so that it can also be precisely adapted to the adjacent floor areas, for example to an adjacent stair step. Of particular advantage is the Invention that the auxiliary lifting device requires only a few inexpensive additional devices, since the basic structure of the generic pedestal remains unchanged.

Further features of the invention are specified in the subclaims and explained in more detail below in connection with the description of the figures.

Fig. 1

in einem Längsschnitt gemäß der Linie I-I in Fig. 4 ein erstes Ausführungsbeispiel eines Podestbockes nach der Erfindung, in seiner tiefsten Grundstellung,

Fig. 2

den Podestbock in einer Zwischenstellung, bis zu der der Podestbock mittels der Hilfs-Hubeinrichtung hochgefahren wird,

Fig. 3

den Podestbock in seiner höchsten Stellung,

Fig. 4

eine Draufsicht auf den Podestbock in einer Stellung nach Fig. 1, wobei Plattform und Oberrahmen weggelassen sind,

Fig. 5

ein zweites Ausführungsbeispiel eines Podestbockes nach der Erfindung, und zwar in einer Draufsicht auf den in seiner tiefsten Grundstellung befindlichen Podestbock, wobei Plattform und Oberrahmen weggelassen sind,

Fig. 6

in vergrößerter Darstellung ein Detail des Podestbockes nach Fig. 5,

Fig. 7

einen Schnitt gemäß der Linie VII in Fig. 5,

Fig. 8

ein weiteres Detail des Podestbockes nach Fig. 5,

Fig. 9, 10 und 11

in Längsschnitten den Podestbock nach Fig. 5 in drei verschiedenen Höheneinstellungen,

Fig. 12

ein drittes Ausführungsbeispiel in einer seitlichen Detaildarstellung des Podestbockes,

Fig. 13

ein viertes Ausführungsbeispiel in Draufsicht,

Fig. 14 bis 19

in vereinfachter Seitenansicht ein fünftes Ausführungsbeispiel des Podestbockes nach der Erfindung in sechs unterschiedlichen Hubhöhen,

Fig. 20 bis 22

ein sechstes Ausführungsbeispiel in vereinfachter Seitenansicht, wobei jeweils der Podestbock in drei verschiedenen Hubhöhen dargestellt ist und

Fig. 23

in einer vergrößerten Darstellung ein Detail des Podestbockes nach den Fig. 20 bis 22.

The object of the invention is described below with reference to several exemplary embodiments shown in the drawing. The drawing shows:

Fig. 1

in a longitudinal section along the line II in Fig. 4, a first embodiment of a pedestal according to the invention, in its lowest basic position,

Fig. 2

the pedestal in an intermediate position up to which the pedestal is raised by means of the auxiliary lifting device,

Fig. 3

the pedestal in its highest position,

Fig. 4

2 shows a plan view of the pedestal in a position according to FIG. 1, the platform and the upper frame being omitted,

Fig. 5

2 shows a second exemplary embodiment of a pedestal frame according to the invention, namely in a plan view of the pedestal frame in its lowest basic position, the platform and upper frame being omitted,

Fig. 6

5 an enlarged view of a detail of the pedestal frame according to FIG. 5,

Fig. 7

5 shows a section along line VII in FIG. 5,

Fig. 8

5 shows a further detail of the pedestal according to FIG. 5,

9, 10 and 11

in longitudinal sections the pedestal according to FIG. 5 in three different height settings,

Fig. 12

a third embodiment in a detailed side view of the pedestal,

Fig. 13

a fourth embodiment in plan view,

14 to 19

in a simplified side view a fifth embodiment of the pedestal according to the invention in six different lifting heights,

20 to 22

a sixth embodiment in a simplified side view, wherein the pedestal is shown in three different lifting heights and

Fig. 23

in an enlarged view a detail of the pedestal according to FIGS. 20 to 22.

The pedestal consists in its basic structure of a platform 1, a rectangular upper frame 2 supporting the platform 1, a rectangular lower frame 3 and two X-shaped lifting scissors 4, 5. The scissor legs 6, 7 of the lifting scissors 4 and the scissor legs 8, 9 of the Lifting scissors 5 are articulated at one end at vertically superimposed corner points 10, 11 of the upper frame 2 and the lower frame 3, while the other ends 12, 13 can be moved via rollers 14, 15 on slideways 16, 17 of the upper frame or lower frame.

A motor 18 with a self-locking gear 19 is arranged on the subframe 3, which drives two spindles 21, 22 via a chain drive 20, which are directed parallel to the longitudinal sides of the subframe 3 and each pass through a spindle nut 23, 24. The spindle nuts 23, 24 are each carried by a carriage 25, 26. Each carriage 25, 26 is supported with an impeller 27 and with one of the rollers 15 on slideways of the lower frame. The articulation axis 28 carrying the rollers 15 passes through both carriages 25, 26 and forms a common articulation axis for the scissor legs 7, 9. When the motor 18 and the spindles 21, 22 are locked in place on the subframe, the spindles 21, 22 rotate, that the spindle nuts 23, 24 and the carriages 25, 26 carrying them move to the left in the drawing and thereby raise the scissors, as can be seen in particular from FIG. 3.

In the basic position according to FIG. 1, the scissor legs 8, 9 - and 6, 7 - are almost parallel to each other, and the scissor joint 29 is located at the same height as the central longitudinal axis of the spindles 21 and 22. In this position, the scissor legs do not yet offer a moment arm on which the spindle drive described could effectively engage. In order to enable starting from the flat basic position according to FIG. 1, the pedestal is equipped with two auxiliary lifting devices 30, 31. The motor 18 is mounted on a carriage 32 together with its gear 19, the chain drive 20 and the spindles 21, 22. The carriage 32 is supported by four wheels 33, 34, 35, 36 on guide plates 37, 38 of the lower frame 3. The guide plates 37, 38 carry on their inner longitudinal edges guide pieces 39, 40 which are provided with guide grooves 41, 42 in which a base plate 43 of the carriage 32 is guided exactly parallel to the subframe 3. The carriage 32 can be moved in the direction of the spindle nuts 23, 24 until it hits the stops 44, 45. On each side, the carriage 32 also carries an overrun roller 46, 47, to which attached ramp ramps 48, 49 are attached to the scissor legs 7 and 9. The ramps 48, 49 are each inclined by an angle a of approximately 30 ^° with respect to the longitudinal extent of the scissor legs 7, 9.

In the basic position according to FIG. 1, the run-up rollers 46, 47 rest against the upper end of the run-up ramps 48, 49, which fall off to the side of the spindle nuts 23, 24. The run-up ramps 48, 49 are - seen from the spindle nuts 23, 24 - beyond the scissor joint 29.

When the motor 18 is switched on in the position according to FIG. 1, the spindles 21, 22 rotate into the spindle nuts 23, 24 acting as abutments, so that the entire slide 32 moves to the right, the idler rollers 46, 47 being the Drive under ramp 48, 49 and raise scissor legs 7, 9 by an initial distance to the intermediate position shown in FIG. 2. As soon as the carriage 32 has reached the stops 44, 45, the auxiliary lifting devices 30, 31 lose their lifting function. From this point in time, the slide assembly forms the fixed abutment, onto which the spindle nuts 23, 24 and thus the movable ends 12, 12 of the scissor legs 7, 9 are now pulled when the spindles 21, 22 are rotated further, so that the further stroke of the pedestal in the usual way by moving the spindle nuts.

The invention is not restricted to the exemplary embodiment shown. For example, instead of two spindles 21, 22, a single central spindle can be provided, the two carriages 25, 26 being combined into one carriage.

The motor and the associated auxiliary lifting devices can also be attached to the upper frame instead of the lower frame. In such a modification, the pedestal shown in FIGS. 1 to 4 would be upside down and only the platform would have to be moved from one frame to the other frame.

Longer pedestals can also be provided at both ends with one of the pairs of scissors shown with associated lifting devices. In this embodiment, instead of X-shaped scissors, Y-shaped scissors can also be used, in which the movable end 13 of the scissor legs 6, 8, which are each not driven directly by the lifting device, can be omitted. In this modified embodiment, the slide and the auxiliary lifting devices are each arranged between the spread scissor leg halves of the Y-scissors.

5 to 11 show a second embodiment in which the spindle drive 50, which comprises the motor 18, the gear 19, the chain drive 20 and the spindles 21, 22 with their bearings, is supported on the subframe 3 in a stationary manner. An auxiliary lifting device 51, 52 is arranged on each spindle 21, 22. Each auxiliary lifting device comprises a carriage 53 which can be moved on a running surface of the lower frame 3 and a spindle nut 54 which has a flange as a driver 55 which is rigidly connected to the carriage 53. The auxiliary lifting devices 51, 52 are each designed as spreading devices and have an inclined ramp 56 on their carriage 53, which cooperates with an overrun member 57 designed as a roller, which is in each case attached to the adjacent scissor legs 7 and 9, cf. also the enlarged illustration according to FIG. 8. The auxiliary lifting devices 51, 52 are arranged in the area of the center of the pedestal below the platform 1.

At the movable ends 12, 12 of the scissor legs 7, 9 an approximately U-shaped transmission member 58 is articulated in plan view, the articulation being carried out on the axles carrying the rollers 15. The transmission member 58 can be moved by means of rollers 59 on the floor or on running surfaces of the lower frame 3. The spindles 21, 22 pass through holes 60 provided with play in the U-back of the transmission member 58 and protrude into the spindle bearings 61, 61 fixed to the frame. Between the bearings 61 and the U-back of the transmission member 58, a further spindle nut 62 is arranged on each spindle 21, 22, which has a flange-shaped driver 63 at its end facing the bearings 61. The spindle nut 62 can pass through the hole 60 in the transmission member 58 until its driver 63 strikes the back of the transmission member 58. In the basic pedestal position shown in FIG. 5, the catch 63 engages the transmission member 58 with a play S.

Fig. 7 illustrates the rotation lock of the spindle nut 62, which surrounds a bottom-side slide rail 65 with a fork-shaped projection 64 and is therefore only movable along this slide rail.

5 and 9, both spindle nuts 54 and 62 run synchronously to the left, ie towards the fixed corner points 11, 11 of the lifting scissor limbs. Since the spindle nuts 54, 54 immediately carry the carriages 53, 53 rigidly attached to them, the ramps 56, 56 located on the carriages 53, 53 become under the overrun members 57, 57 are pressed, which are increasingly raised to the intermediate height shown in FIG. 10 in accordance with the rise of the ramps 56, 56. During this initial stroke exerted by the auxiliary lifting devices 51, 52, the spindle nuts 62, 62, which initially run empty, reach the operative position shown in FIG. 10, in which their drivers 63, 63 have hit the transmission member 58. With a further advance of the spindle nuts 62, 62, the drivers 63, 63 take the transmission member 58 with them and are thus now in operative engagement with the movable lifting leg ends 12, 12, so that the further erection of the pedestal via the spindle nuts 62, 62 or their drivers 63, 63 takes place. The run-up members 57, 57 separate from the run-up ramps 56, 56 and, as shown in FIG. 11, rise with the lifting scissors 4, 5. The auxiliary lifting devices 51, 52 thus run empty in this main lifting phase. During the initial stroke, the auxiliary lifting devices 51, 52 are supported with the rollers of their carriages 53 on the running surfaces of the lower frame 3, which in this case act as abutment surfaces 66.

Fig. 12 illustrates a modification of the above-described embodiment, which consists in that each ramp ramp 56a on the rising scissor legs 9 and 7 and the roller-shaped ramp member 57a on the carriage 53 are arranged.

Fig. 13 illustrates a modification, which consists in that the drivers 55 and 63 are attached to the ends of a common carrier 67, which here as a enclosing the spindle 21 and 22 respectively and the transmission member 58 is formed through tube. The tubular support 67 is rigidly connected to a spindle nut 68 arranged in its interior, which moves the drivers 55, 63 when the motor 18 is switched on in the manner described with reference to the exemplary embodiment according to FIGS. 9 to 11.

14 to 19 show a schematic illustration of a further exemplary embodiment, in which the only difference from the embodiments according to FIGS. 5 to 13 is that the auxiliary lifting device - instead of a ramp / ramp member-spreading device - has a spreading lever 69 on the scissor joint 29 is permanently articulated and carries a roller 70 at its other end. 14, the roller 70 rests on the abutment surface 66, and the axis of the roller 70 lies lower than the scissor joint 29, so that the spreading lever 69 is inclined towards the driver 55.

When the spindle drive is switched on, the driver 55 immediately presses the spreading lever 69 into an increasingly steeper position according to FIGS. 15 and 16 via the roller 70. During this initial stroke, the second driver 63 initially runs empty. If the second driver 63 has hit the transmission member 58, cf. 16, the second driver 63 takes over the further erection of the pedestal, the spreading lever 69 separating from the first driver 55 and rising with the pedestal. The spreading lever 69 is thereby by a chain 71 attached to the scissor legs 9 in the approximately half-height pedestal position according to FIG Carrier 55 held in an inclined position so that when the pedestal is lowered from the position shown in FIG. 18, the roller 70 is again in a suitable manner to the right of the upper articulation point of the spreading lever 69 on the scissor joint 29 and the spreading lever 69 automatically in the position shown in FIG 1 can return again.

20 to 22 show a schematic representation of a further exemplary embodiment, in which - instead of the rod-shaped expansion lever 69 according to the exemplary embodiment according to FIGS. 14 to 19 - an eccentric disk 72 is provided, which in the basic position has a bearing mouth 73 at one end , which loosely receives a bolt 74 arranged coaxially to the scissors joint 29, also compare the enlarged illustration according to FIG. 23, which shows the eccentric disk 72 in an intermediate position which lies between the positions according to FIGS. 20 and 21. At its opposite end, the eccentric disc 72 is permanently articulated on the driver 55, the articulation point 75 on the driver 55 also being lower than the central axis of the bolt 74 in the basic position according to FIG. 20. The eccentric disc 72 carries at its edge a series of small support rollers 76 which roll in succession on the abutment surface 66 when the eccentric disc 72 is pivoted. After the initial stroke has been carried out by means of the driver 55, the eccentric disc 72 remains on the driver 55 while the bolt 74 rises together with the scissors.

Reference symbol list

1

platform

2nd

Top frame

3rd

Subframe

4th

Lifting shears

5

Lifting shears

6

Scissor thighs

7

Scissor thighs

8th

Scissor thighs

9

Scissor thighs

10th

Corner point

11

Corner point

12

movable ends of 7 and 9

13

movable ends of 6 and 8

14

role

15

role

16

Slideways

17th

Slideways

18th

engine

19th

transmission

20th

Chain drive

21

spindle

22

spindle

23

Spindle nut

24th

Spindle nut

25th

dare

26

dare

27th

Wheel

28

Articulation axis

29

Scissors joint

30th

Auxiliary lifting device

31

Auxiliary lifting device

32

carriage

33

wheel

34

wheel

35

wheel

36

wheel

37

Guide plate

38

Guide plate

39

Guide piece

40

Guide piece

41

Guide groove

42

Guide groove

43

Base plate

44

attack

45

attack

46

Caster

47

Caster

48

Ramp

49

Ramp

50

Spindle drive

51

Auxiliary lifting device

52

Auxiliary lifting device

53

dare

54

Spindle nut

55

Carrier

56

ramp

57

Overrun link

58

Transmission link

59

roll

60

hole

61

warehouse

62

Spindle nut

63

Carrier

64

approach

65

Slide rail

66

Abutment surface

67

carrier

68

Spindle nut

69

Spreading lever

70

Roll (lower end of 69)

71

Chain

72

Eccentric disc

73

Camp mouth

74

bolt

75

Pivot point

76

Support roller

a

angle

S

game

56a

ramp

57a

Overrun link

Claims (23)

Height-adjustable pedestal for building theater stages, grandstands or the like, with a platform (1) carried by lifting scissors (4, 5) and with at least one spindle (21, 22) which can be driven by a motor (18) and is oriented parallel to the platform the lifting scissors (4, 5), each spindle (21, 22) carrying a spindle nut (23, 24) and one of the scissor legs (7, 9) of each lifting scissors (4, 5) articulated to a spindle nut (23, 24) characterized in that the motor (18) and the spindle (21, 22) are arranged together on a slide (32) which in the direction of the spindle nut (23, 24) until it hits a stop (44, 45) is movably guided that an auxiliary lifting device (30, 31) is formed on the carriage (32) and on a rising part (7, 9) of the pedestal, which translates the horizontal movement of the carriage (32) into a lifting movement of the pedestal that when switching on the motor (18) in the flat pedestal base The slide (32) moves towards the spindle nut (23, 24) acting as an abutment and in this case raises the lifting scissors (4, 5) by an initial path via the auxiliary lifting device (30, 31) and that after the slide (32 ) on the stop (44, 45) the spindle nut (23, 24) with further erection of the lifting shears (4, 5) on the slide (32). Pedestal frame according to claim 1, characterized in that it has an upper frame (2) supporting the platform (1) and a lower frame (3), that the lifting scissors (4, 5), each with two leg ends, are stationary at corner points (10, 11) lying one above the other ) are articulated from the upper frame (2) and lower frame (3) and that the carriage (32) carrying the motor (18) and the spindle (21, 22) is arranged either on the upper frame, lifting itself, or preferably on the lower frame (3) is. Pedestal frame according to claims 1 or 2, characterized in that it has two X-shaped lifting scissors (4, 5) whose scissor legs (6, 7; 8, 9) have approximately the same length as the platform (1). Pedestal frame according to claims 1 or 2, characterized in that it has two pairs of Y-shaped lifting scissors and that auxiliary lifting devices are each arranged between the spread scissor leg halves. Pedestal frame according to one or more of claims 1 to 4, characterized in that each lifting shear (4, 5) is assigned a spindle (21, 22) and an auxiliary lifting device (30, 31) which are operated by a common motor (18). are driven. Pedestal frame according to claim 5, characterized in that each auxiliary lifting device (30, 31) consists of an inclined ramp (48, 49) attached to one of the scissor legs (7, 9) and an idler roller (46, 47) arranged on the slide (32) and underneath the ramp (48, 49). Pedestal frame according to claim 6, characterized in that each ramp (48, 49) - seen from the spindle nuts (23, 24) - is arranged beyond the scissor joint (29). Pedestal frame according to claims 6 or 7, characterized in that each ramp (48, 49) is inclined by approximately 30 ^° with respect to the longitudinal extent of its scissor arm (7 or 9). Pedestal frame according to one or more of claims 1 to 8, characterized in that the slide (32) has a base plate (43) which on opposite sides in guide grooves (41, 42) of guide pieces (3) or upper frame fastened to the lower frame 39, 40) is performed. Pedestal frame according to one of claims 6 to 9, characterized in that each spindle nut (23, 24) is carried by a movable carriage (25, 26) on which the movable end (12, 12) of the associated scissor arm (7, 9) is articulated, the two movable scissor leg ends (12, 12) being connected to a common articulation axis (28) which passes through both carriages (25, 26). Pedestal frame according to one or more of claims 1 to 10, characterized in that the motor (18) has a self-locking gear (19) and the spindles (21, 22) have a self-locking trapezoidal thread. Pedestal frame according to one or more of claims 1 to 10, characterized in that the motor (18) is a stepping motor. Height-adjustable pedestal for the construction of theater stages, grandstands or the like, with a platform (1) carried by lifting scissors (4, 5) and with a motor-driven spindle drive (50) fixed to the pedestal, which is attached to horizontally movable scissor arm ends (12, 12) the lifting scissors (4, 5) engage in order to pull them towards the fixed corner points (11, 11) of the lifting scissors, characterized in that - An auxiliary lifting device (51, 52), which can also be driven by the motor-driven spindle drive (50), is arranged in the area of the center of the pedestal below the platform (1), - That the spindle drive (50) when switching on the motor (18) in the flat pedestal base position initially only actuates the auxiliary lifting device (51, 52), which raises the pedestal by an initial stroke, during which initial phase the attack of the spindle drive (50) at the movable ends of the scissors legs (12, 12) - And that only towards the end of the initial phase of the spindle drive (50) acts on the movable scissor leg ends (12, 12) and further raises the pedestal, during which time the auxiliary lifting device (51, 52) runs empty. Pedestal frame according to claim 13, characterized in that the spindle drive (50) drives two synchronously running drivers (55, 55; 63, 63) which can move parallel to its spindle (21, 22), of which a first driver in the basic pedestal position
(55, 55) is in operative connection with the auxiliary lifting device (51, 52) and the second driver (63, 63) engages behind a transmission member (58) articulated on the movable scissor leg ends (12, 12) with such play (S), that the second driver (63, 63) comes into operative connection with the transmission member (58) only after actuation of the auxiliary lifting device (51, 52). Pedestal frame according to claims 13 and 14, characterized in that the auxiliary lifting device (51, 52) consists of a spreading device which is arranged between an ascending pedestal frame part (57) and a bottom abutment surface (66) and the horizontal movement of the first driver ( 55, 55) into a vertical lifting movement. Pedestal frame according to claim 15, characterized in that the auxiliary lifting device (51, 52) consists of two parts (57, 57a, 69, 74; 56, 56a, 55, 72) which can be separated from one another and of which the parts are attached to the ascending part of the pedestal frame Parts (57, 57a, 69, 74) after executing the initial stroke separate from the other parts (56, 56a, 55, 72) when you raise the pedestal further. Pedestal frame according to claims 14, 15 or 16, characterized in that the two drivers (55, 63) are attached to a common support (67) which is rigidly mounted on a spindle (21, 22) of the spindle drive (50) Spindle nut (68) is attached. Pedestal frame according to claims 14, 15 or 16, characterized in that each driver (55, 63) is attached to an associated spindle nut (54, 62) running on a spindle (21) of the spindle drive (50). Pedestal frame according to one or more of claims 15 to 18, characterized in that each auxiliary lifting device (51, 52) has a ramp element (57) which interacts with an inclined ramp (56). Pedestal frame according to one or more of claims 15 to 18, characterized in that each auxiliary lifting device has an inclined spreading lever (69) which is articulated at its higher end to an ascending pedestal part (at 29) and at its lower end (roller) 70) is supported on the abutment surface (66) and that the first driver (55) engages at the lower end of the spreading lever (69) and when the motor (18) is switched on in the flat pedestal base position, the spreading lever (69) in a steeper position transferred. Pedestal frame according to claim 20, characterized in that the first driver (55) acts as a loose stop on the spreading lever (69), which also rises when the pedestal frame is further erected. Pedestal frame according to claim 20, characterized in that the spreading lever is designed as an eccentric disc (72) which is detachably articulated on a scissor-side bolt (74) with a bearing jaw (73) and on one also in the flat pedestal base position below the bolt (74 ) located point (75) is firmly articulated to the first driver (55). Pedestal frame according to claim 22, characterized in that the eccentric disc (72) carries at its edge a row of small support rollers (76) which roll in succession on the abutment surface (66) when the eccentric disc is pivoted.

Images