EP1876136B1 - Supporting element - Google Patents

Abstract

The supporting unit (2) has a sensor unit (4) for measuring a weight force that effects between a vehicle that is to be lifted and a bearing unit. The sensor unit outputs a signal, which is a characteristic of the weight force. A transmission unit outputs the characteristic signal or a signal that is derived from the characteristic signal. The transmission unit outputs the characteristic signal wirelessly to a receiving unit, where the supporting unit is removable from the bearing unit.

Description

The present invention relates to a lift for motor vehicles. Such lifts are known from the prior art for a long time. The invention will be described with reference to a car lift and more particularly to a two-pillar lift, with a lifting device which can be raised and lowered in the vertical direction on each pillar. This lifting device has horizontally pivotable support arms for receiving the motor vehicles.

In such lifts is always important to ensure that the individual support points between the support arms or their support surfaces and the areas to be lifted of the vehicle are precisely selected and do not change the balance of power in the course of the lifting process. In particular, it should be noted that the receiving elements of the lift are placed on the correct support points of the object or vehicle to be lifted. If a support surface is improperly mounted, it may come in the course of the lifting process to a complete relief of the corresponding receiving element and even to a tilting or falling of the vehicle.

From the DE 29 37 582 A1 is a lift, in particular a two-post lift for motor vehicles, known. This lift has on the support elements to force measuring devices whose output signals are forwarded to a downstream safety circuit. Through these output from the force measuring devices signals a possible imbalance of the vehicle can be detected. The force measuring device is firmly integrated into the system of the lift, or the support arms of the lift are already tuned to this force measuring devices. That from the DE 29 37 582 A1 known system is therefore not applicable to existing lifts or retrofitted. Also, in the case of the failure of individual force measuring devices, a replacement of the same is difficult, since they are firmly integrated into the lift system.

From the DE 9312286 U1 Designating a support element according to the preamble of claim 1 is a lift with a plurality of support arms designated at least one of these support arms, a sensor is arranged, which responds to a Gewichtsbelastuna the support arm and this sensor is connected to a display, monitor or the like.

The present invention is therefore based on the object to improve the safety of lifts and thereby equip existing or older models with such security systems can. Another object of the invention is to provide a lift that allows correction in case of imbalance occurring.

This is inventively achieved by a support element according to claim 1. Advantageous embodiments and further developments are the subject of the dependent claims.

The supporting element according to the invention for lifting platforms can be arranged between a carrying element of the lifting platform and a vehicle to be lifted and is removable from the carrying element according to the invention and has a sensor device for measuring a weight force acting between the vehicle and the carrying element or transmitted from the vehicle to the carrying element, wherein the sensor device outputs a signal that is characteristic of this weight. In addition, a transmitting device is provided which outputs the characteristic of this weight signal or a signal derived from this signal. According to the invention, the receiving element on a receiving plate (8) for receiving a portion of the vehicle and a sleeve body. A removable arrangement of the support element of the support member is understood to mean that this particular without material impairment of the support member or the support element can be removed from the support element, for example by peeling or unscrewing, in particular without the use of tools. It is also understood that the support element can be removed without high time or energy expense of the support member of the lift. In this way, a simple replacement or retrofitting older models is possible. Preferably, the support element can be inserted into an area of the support element.

A sensor device is understood to mean any sensor device which is suitable for measuring weight forces occurring between the vehicle and the carrying element of the lifting platform. Preferably, the sensor device is a force measuring device. The sensor device is particularly advantageously a strain gauge which is arranged in a region of the support element. In an advantageous embodiment, the support element is a body which is deposited on the support element and in another embodiment a support element which is screwed to a component of the support element. The carrying element is in particular a region of the support arm of the lifting platform or a segment of this carrying arm.

The support element is particularly preferably arranged on the support region of the support element for the vehicle.

In this way, it is also achieved that the sensor device is influenced directly by the weight of the vehicle and is not possibly further transmitted via a plurality of further support arms.

In a preferred embodiment, the support element has a transmitting device which outputs the characteristic signal output by the output device wirelessly to a receiving device. In principle, it would also be possible to connect the support element via a cable connection to a central device or to equip the support element directly with an output device such as a display. However, a wireless connection between the support elements and the receiving device is advantageous.

Preferably, the transmitting device also outputs, in addition to the output characteristic signal for the force, an identification signal which uniquely characterizes the supporting element. It is thus possible, for example, for a signal characteristic of the measured force as well as an identification code to be output as part of a binary code. In this way, for example, a central computer can determine from which support element the corresponding signal originates. Thus, for example, it can be avoided that a signal is detected which is from another support element and thus confusion can be avoided.

Particularly preferably, the signal is transmitted via electromagnetic waves, wherein in particular radio, infrared light, ultraviolet light and the like come into consideration.

In a further preferred embodiment, the support element has a power storage device such as a battery. Thus, the support element can autonomously output all measured signals.

However, it would also be possible to supply the support element via other energy supply means such as induction loops and the like with the necessary energy. It would also be possible to connect the support element to an external power source.

In a further preferred embodiment, further force measuring devices such as strain gauges are provided on the support arms of the lift. Force measuring devices, in particular with strain gauges, can also be arranged on the corresponding lifting columns.

In a further preferred embodiment, transponders or the like can be used to transmit the measured data, such as the weight forces.

In a further advantageous embodiment, the sensor device is preferably provided in the sleeve body. In this embodiment, so that the support element is formed in two parts and consists of the receiving plate and the sleeve body. In this case, the sleeve body particularly advantageously has a sleeve section which accommodates a region of the receiving plate and a peripheral collar which is supported against the carrying element of the lifting platform. Particularly advantageously, the sensor device is arranged in this circumferential collar. The force acting by the motor vehicle weight is transmitted via the receiving plate on the sleeve portion and more precisely the peripheral collar. This can be measured by the arrangement of sensor devices in this circumferential collar directly the weight forces. Particularly preferably, the lower region of this circumferential collar is supported from the support element. This embodiment allows a quick and easy removal of the Supporting element of the support member, since the support element can be easily used for example in an opening of the support member. For a tool-free replacement of the support element is possible.

In a further preferred embodiment, the support element has a plurality of sensor devices which are distributed uniformly in the circumferential direction of the circumferential collar. In this way, the weight of the vehicle can be determined more accurately, for example, faulty sensor devices can be detected or the output values of the individual sensor device can be averaged.

It is possible that the individual sensor devices in each case transmit the values to the output device. In a further preferred embodiment, the receiving plate is movable relative to the sleeve body in a longitudinal direction of the sleeve portion. In this way, a correction of the individual receiving points relative to the vehicle can be achieved. At the same time, however, the force measurement is not influenced by this movement of the receiving plate relative to the sleeve body, since the circumferential collar is still supported relative to the support arm.

Particularly preferably, the receiving plate or the region of the receiving plate, which is received by the sleeve portion of the sleeve body, an external thread and the sleeve portion has an internal thread. By such an arrangement, a particularly low-wear power transmission and also a height adjustment can be made possible.

In another embodiment, the receiving element on a base body of a deformable material in at least one direction and the sensor device is provided in the interior of this body. In particular, the base body is deformable at least in the direction in which the weight of the vehicle acts. Preferably, an energy storage device and a transmitting device are arranged in the interior of this base material in addition to the sensor device. Preferably, the body is made of a hard rubber material which is capable of absorbing the high weight forces of a vehicle without being damaged. Also in this embodiment, the sensor device is particularly preferably a strain gauge. However, it would also be possible to measure deformations in one direction, which is perpendicular to the weight.

Furthermore, a support arm for a nitch claimed lift conceivable with a first Tragearmabschnitt and a second Tragearmabschnitt, which is in communication with the first Tragearmabschnitt and can be moved relative to this telescopically. According to the invention, a sensor device for measuring a weight of the vehicle is arranged on the second arm section. Advantageously, here too the sensor device is a strain gauge. This is particularly preferably arranged on the vehicle or the support point on the vehicle facing the end of the second Tragearmabschnitts. Also in this way a largely immediate measurement of the forces occurring is possible.

The present invention is further directed to a lift with at least one support element according to claim 1.

The present invention further relates to a measuring arrangement for lifting platforms with a plurality of erfindungemäßen support elements according to claim 1 and a central work unit, wherein the working unit has a receiving device for the output from the transmitting means of the support elements signals. This may be, for example, a central computer, which receives the signals of the support elements. Preferably, this working unit can distinguish the incoming signals on the basis of their identification signal and assign them to a specific support element.

Particularly preferably, the working unit has a memory device in which vehicle-specific characteristics are stored, such as, for example, the relationships between a weight load on the rear axle and a weight load on the front axle.

In this way, it is possible for the processor device to decide on the basis of the measured weight forces which support elements are assigned to the front region of the vehicle and which support elements are assigned to the rear region of the vehicle. So it is conceivable, for example, in a number of vehicles that on the front support elements the double weight load as on the rear support elements, since the engine is arranged in the front region of the vehicle. Join other vehicles in this case weight ratios of 2: 3. On the basis of these known conditions so that the support elements can be assigned to the positions of the vehicle. In this way, the load distributions provided by the relevant CE regulations can be monitored.

Furthermore, the processor device preferably makes the decision, taking into account the total weight of the vehicle, as to whether weight ratios of 2: 1 or 3: 2 are used. For example, for a total weight up to 3.0 tons, i. a weight ratio of 2: 1 and at a higher weight a ratio of 3: 2. In addition, the processor device can also allow certain deviations from the above-mentioned target ratios, such as deviations between + 5% and - 5 % of the setpoint.

However, it would also be possible that the individual support elements are provided with labels that allow the operator to assign them correctly, such as "front right", "rear left" and the like.

Preferably, the identification codes of the individual support elements are also stored in the processor device, so that the processor device can distinguish whether a specific signal originates from an associated support element or, for example, from another support element. Preferably, the identification codes stored in the working unit are changeable. In this way, for example, damaged support elements can be replaced by new support elements and continue operation in this way. In this case, the processor device can preferably be switched between a learning mode and a working mode, wherein new support elements can be read in the learning mode.

In a further preferred embodiment, the working unit also has a display or a display device. On this display, for example, the individual measured weights can be output. Also, an alarm device may be provided which outputs an alarm signal when exceeding or falling below a certain weight force value and, for example, stops a lifting operation. Furthermore, the alarm device can also cause only a downward movement of the lift is possible. In addition, this display can also provide more detailed information, for example be spent on the exact weight distribution at different support points.

The measurement of the weight forces preferably takes place at predetermined intervals, for example in the 5 sec cycle. However, it would also be possible to control the intervals as a function of the respective movement of the lift and to select a longer interval at standstill than a lifting movement. For this purpose, acceleration sensors could additionally be installed in the support elements, which detect a movement of the respective support element.

Advantages and advantages can be found in the following description in conjunction with the drawings.

Fig. 1

ein erfindungsgemäßes Auflageelement in einer ersten Ausführungsform;

Fig. 2

eine Draufsicht auf das Auflageelement aus Fig. 1;

Fig. 3

ein Auflageelement, das in einem Tragarm eingesetzt ist;

Fig. 4

einen Hülsenkörper eines Auflageelements nach Fig. 1;

Fig. 5

eine perspektivische Ansicht des Hülsenkörpers aus Fig. 4;

Fig. 6

eine vergrößerte Detaildarstellung des Hülsenkörpers aus Fig. 4;

Fig. 7

ein Auflageelement in einer weiteren nicht beanspruchten Ausführungsform;

Fig. 8

eine Draufsicht von unten auf das in Fig. 7 gezeigte Auflageelement;

Fig. 9

eine Darstellung des Auflageelements aus Fig. 8 entlang der Linie A-A;

Fig. 10

einen nicht beanspruchten Tragarm einer Hebebühne;

Fig. 11

eine Seitenansicht des Tragarms aus Fig. 10; und

Fig. 12

ein Blockdiagramm einer erfindungsgemäßen Messanordnung.

Showing:

Fig. 1

an inventive support element in a first embodiment;

Fig. 2

a plan view of the support element Fig. 1 ;

Fig. 3

a support element which is inserted in a support arm;

Fig. 4

a sleeve body of a support element after Fig. 1 ;

Fig. 5

a perspective view of the sleeve body Fig. 4 ;

Fig. 6

an enlarged detail of the sleeve body Fig. 4 ;

Fig. 7

a support element in a further unclaimed embodiment;

Fig. 8

a top view from below on the in Fig. 7 shown supporting element;

Fig. 9

an illustration of the support element Fig. 8 along the line AA;

Fig. 10

an unclaimed arm of a lift;

Fig. 11

a side view of the support arm Fig. 10 ; and

Fig. 12

a block diagram of a measuring arrangement according to the invention.

Fig. 1 shows a support element 2 in a first embodiment. This support element 2 has a receiving plate 8 for receiving a portion of a vehicle. This receiving plate 8 has a contact surface 3, which is the same when lifting the vehicle with parts. This contact surface is designed here as a rubber pad 3. Below the rubber pad 3 a Ronde 5 is provided, which is connected to a threaded piece 10. With the help of a cylinder screw 9, the rubber pad 3 is attached to the threaded part 10. The receiving plate 8 is thus composed of the threaded part 10, the rubber pad 3 and the blank 5 together.

It is possible to weld the Ronde 5 with the threaded part 10 and after the welding process in the top plate grinding to grind. The receiving plate 8 rests in the assembled state in a sleeve body 12. More specifically, for this purpose, the sleeve body 12 has an internal thread which can be screwed to a corresponding external thread of the support plate 8 and the threaded part 10. The sleeve body 12 has a sleeve portion 15 and a collar 16. Opposite this collar 16, the Ronde 5 of the support plate 8 is supported. In this case, the rubber pad 3 is also attached to the peripheral edge of the blank 5 by a projection 19. The receiving plate is also referred to below as a support plate.

The reference numeral 17 refers to a pin of the sleeve body 12, with which this can be arranged in a preferred position on a support arm. This pin engages in a corresponding opening of the support arm. In this way, the support element on the one hand rotationally fixed in the support arm can be arranged on the other hand but also easily, namely by pulling, are removed from the support arm. Conversely, a pin could also be provided in the support arm, which engages in a corresponding opening of the support element 2.

The reference numeral 11 denotes a locking ring which prevents complete removal of the receiving plate 8 from the sleeve body 12.

By a rotation of the receiving plate 8 relative to the sleeve body 12 is a displacement of the receiving plate relative to the sleeve body 12 in the longitudinal direction L in Fig. 1 possible. At or in the circumferential collar or peripheral edge 16, the sensor device 4 according to the invention is provided for force measurement. More specifically, at the in Fig. 1 shown embodiment, four sensor devices evenly distributed in the circumferential direction of the receiving plate 8 and the circumferential collar 16. It should be noted that the full weight force between the bottom 16a and the peripheral edge 16 and the support arm of the lift acts. This can be achieved by an arrangement of the sensor device 4 at the in Fig. 1 shown point the transmitted weight force are measured, regardless of whether the receiving plate 8 is completely screwed into the sleeve body 12. In the case of a defect or failure of individual sensor devices therefore not the entire arm must be replaced, but it is sufficient to replace the sleeve body 12 against another sleeve body.

Fig. 2 shows a plan view of the in Fig. 1 shown support element. It can be seen here both the cylinder screw 9, which serves to attach the rubber pad and the rubber pad 3 itself.

Fig. 3 shows a further embodiment of a support element according to the invention, which is installed in a support arm of a lift. For this purpose, the support arm has an end portion 34 with an opening 35 into which the sleeve body 12 is inserted. The sensor device is likewise arranged here on the peripheral edge 16 of the sleeve body 12.

Fig. 4 shows a sleeve body 12 and more precisely its peripheral collar 16. Within the sleeve portion 15, the threaded portion 10 of the receiving plate 8 can be arranged. The circumferential collar is executed here circumferentially, but could also have interruptions.

Fig. 5 shows a perspective view of the in Fig. 4 shown sleeve body. In addition to a round design of the sleeve portion 15 but here also other versions are selected, for example, elliptical cross sections, polygonal cross sections and the like.

Fig. 6 shows a detailed representation of the peripheral edge 16. This has individual holes or recesses 6, in which the sensor devices 4 are arranged. It is for example possible to pour the sensor device 4 in this recess 6 and secure in this way. It would also be possible to choose the opening so thin that essentially only the sensor element finds room. Furthermore, further devices of the sensor device (shown only schematically) may be provided in the opening, such as an output device 13 which outputs measurement signals. In addition, a transmitting device 14 is provided, which forwards the measured signal to a receiving device. Finally, an energy storage device 7 is preferably provided, which supplies the sensor device 4 and the transmitting device 14 with electrical energy. This energy storage device is preferably a battery.

However, the energy storage device 7 and the devices 13 and 14 may also be arranged further inside the sleeve body 12 or in a region of the sleeve body 12 which is not exposed to high weight forces. It is also possible to insert into the sleeve body a sensor module which is composed of the sensor device 4, the transmitting device 14, the energy storage device 7 and optionally further components. In a further preferred embodiment, the energy storage device is arranged such that it can be replaced individually. However, it would also be possible to make the entire sensor module interchangeable.

In addition to the energy storage device 7, however, it would also be possible to achieve the necessary energy supply, for example, via solar cells at the peripheral edge of the peripheral collar 16.

Fig. 7 shows a further nitch claimed embodiment of a support member 20. This support member 20 has a base body 24 which consists of a deformable material such as hard rubber. This support member has an upper support surface 22 which is applied to a portion of the vehicle during the lifting of the vehicle. This embodiment is particularly suitable for underfloor lifts. In addition to the in Fig. 7 shown frusto-conical shape, the support element can also take other forms such as cylindrical shapes, parallelepiped shapes, hemispherical shapes, in particular flattened shapes, elliptical-diameter shapes, trapezoidal shapes, combinations thereof, and the like.

At the in Fig. 7 In the embodiment shown, the support element 20 is formed like a truncated cone and is, as in Fig. 7 shown, for example, placed on lifting pads of a lift.

Fig. 8 shows the bottom of the in Fig. 7 shown support element. In this bottom two larger openings 26 and four smaller openings 25 are arranged. These smaller openings can be used for example for the spatial fixing of the support element relative to the support arm of a lift.

Fig. 9 shows an interior view of the support element Fig. 7 along the line AA in Fig. 8 , It is also possible to integrate in the larger opening 26 electronic components, such as the above-mentioned transmitting device, the energy storage device and processor devices. These elements can be poured into the support element 20. The reference numeral 4 also indicates a sensor device which serves to measure the weight force acting along the arrow P. Again, several such sensor devices can be provided as strain gauges. The sensor device can be designed here as a flat element, which is arranged perpendicular to the plane of the figure.

The advantage of this support element 20 is that it can be arranged in principle at any point of the motor vehicle. Also, this support element can be easily replaced with another support element.

In addition, the support element 20 on one of its side surfaces 23 (FIG. Fig. 7 ) Have labels that indicate to a mechanic, at which point with respect to the vehicle to arrange this support element, for example, "VR" for the front right. In this embodiment as well, the support element emits, in addition to a measurement signal, an identification signal which enables a receiving device to be assigned to the relevant support element. With the correct arrangement of the support elements, the position at which the support element is arranged with respect to the vehicle can thus also be determined.

Fig. 10 shows an unclaimed support member 30 of a lift, which here has a first Tragearmabschnitt 36 and a relative to this first Tragearmabschnitt displaceable second Tragearmabschnitt 40. More specifically, this is a support arm 36 on which a middle drawer arm 38 and a front drawer arm 40 are arranged. This front extension arm 40 has an end portion 34 with an opening 35. In this opening 35, in the Figures 1 - 3 shown support element to be inserted.

However, it is also possible to use a conventional support element in the opening or to design the end portion 34 itself as a support surface. In this case, the sensor device 4, as in Fig. 10 shown disposed directly in the end portion 34 so as to allow an immediate measurement of the weight. Preferably, a rotation measuring strip is also used as the sensor device in this case. In this case, the strain gauge can be arranged in the end portion so that it can be easily exchanged in this case.

The reference numeral 43 refers to a slider for the middle extension arm. Instead of a support element 2 according to the invention, however, a conventional support element could also be inserted into the opening 35. In this case, a sensor device 4 would then have to be arranged in the front extension arm 40. Particularly preferably, then, the sensor element is arranged in the end portion 34, since here, as in the peripheral edge 16, a largely immediate measurement of the weight forces occurring is possible. It would also be possible in this embodiment to integrate transmission devices and output devices directly into the front extension arm 40. In the sliding element 43, one or more sensor elements can also be arranged in the end section 34 instead of or next to the sensor element.

The reference numeral 37 refers to a linkage with which the support arm 30 can be arranged on the vertical lifting elements of the lift and is thereby pivotally held.

The reference numeral 44 refers to a cylinder screw to prevent complete removal of the central extension arm 38 from the support arm 36. A corresponding cylinder screw 41 is also arranged on the front support arm 40.

Fig. 12 shows a block diagram of a measuring arrangement according to the invention for lifts. This measuring arrangement has four support elements in the Figures 1 - 3 shown on. Each of these support elements emits a signal when loaded, which is characteristic of a measured weight force. These signals are delivered to a working unit 50. This working unit 50 has a receiving device 51 for receiving the signals emitted by the support elements 2 and 20, respectively. In addition, a processor device 53 is provided which receives and analyzes signals. In this case, the processor device can not only determine the measured weight forces, but also determine on the basis of identification signals, from which support element which signal comes.

In addition, vehicle data which serve to associate the individual support elements with certain points of the vehicle can also be stored in the processor device or a memory device 55 associated therewith. Thus, for example, based on the transmitted values for the weight force, it can be determined whether the respective support element is arranged under a front region of the vehicle or under a rear region of the vehicle, since, as mentioned above, these respective weight components differ depending on the vehicles. Furthermore, the processor device can also determine the position of the support elements and take this into account in the control of the lift.

Finally, in the working unit 50, an alarm device may be provided, which triggers an alarm, for example, when determining a too low weight acting on one of the support elements, or a non-uniform weight distribution on one or more support elements and, for example, sets a lifting operation.

In addition, the working unit 50 has a display device 54 which outputs to the user the respectively measured weight forces, preferably with an association with the respective support element or the area of the vehicle. Such a display can determine whether the support points of the lift are correctly attached to the vehicle. Thus, as stated above, the working unit is connected to the control of the lifting platform in order to influence the occurrence of incorrect weight distributions can. The work unit may further include an alarm output device (not shown) indicating erroneous weight distribution.

The processor device 53 is therefore also able to distinguish signals originating from the support elements 2, 20 from signals originating from other support elements or other transmission devices. If individual support elements can be exchanged, it is possible to store in the work unit the corresponding new addresses of the replacement support elements. This re-storage can also be done automatically, in which, for example, a read mode is provided which reads in new support elements or their identification codes. Preferably, the working device can also be connected to a computer.

The working unit 50 thus also serves for evaluating the signals of the individual sensor devices in order to determine the loads on the individual contact areas between the support elements and the vehicle in this way. By measuring the weight forces acting on the individual support elements, the evaluation can be used to determine whether the load of the vehicle is correctly distributed in order to enable a safe lifting of the vehicle.

LIST OF REFERENCE NUMBERS

2

support element

3

Contact surface, rubber pad

4

sensor devices

5

Ronde

6

recess

7

Energy storage device

8th

Shot plate

9

Cylinder head screw

10

threaded piece

11

circlip

12

sleeve body

13

output device

14

transmitting device

15

sleeve section

16

peripheral flange

16a

bottom

19

Got over

20

support element

22

bearing surface

23

faces

24

body

25, 26

openings

30

carrying member

34

end

35

opening

36

support arm

37

linkage

38

middle extension arm

40

front extension arm

41

Cylinder head screw

43

Slide

44

Cylinder head screw

50

work unit

51

receiver

53

processor means

54

display

55

memory device

L

longitudinal direction

P

arrow

Claims (9)

1. Rest element (2, 20) for lifting platforms, which can be arranged between a support element (30) of the lifting platform and a vehicle to be lifted, wherein the rest element (2, 20) can be removed from the support element (30) and has a sensor device (4) for measuring a weight force acting between the vehicle and the support element (30), wherein the sensor device (4) outputs a signal which is characteristic of this weight force, and a transmitting device (14) which outputs this characteristic signal or a signal derived from this characteristic signal, characterised in that the rest element comprises a holding plate (8) for holding a region of the vehicle and a sleeve body (12).
2. Rest element according to claim 1, characterised in that the transmitting device (14) outputs the characteristic signal wirelessly to a receiving device (51).
3. Rest element (2) according to claim 1 or 2, characterised in that the sensor device (4) is provided in the sleeve body (12).
4. Rest element according to one of the proceeding claims, characterised in that the sleeve body (12) has a sleeve section (15) which holds a region of the holding plate (8), and also a circumferential collar (16) which can be supported against the support element of the lifting platform, wherein the sensor device (4) is arranged in this circumferential collar (16).
5. Rest element according to claim 4, characterised in that the rest element (2, 20) has a plurality of sensor devices (4) which are distributed uniformly in the circumferential direction of the circumferential collar (16).
6. Rest element according to one of the proceeding claims, characterised in that the holding plate (8) can be moved with respect to the sleeve body (12) in a longitudinal direction (L) of the sleeve section (15).
7. Measuring arrangement for lifting platforms, comprising a plurality of rest elements (2, 20) according to at least one of the proceeding claims and a central working unit (50), wherein the working unit (50) has a receiving device for the signals output by the transmitting devices (14) of the rest elements.
8. Measuring arrangement according to claim 7, characterised in that the working unit has a processor device (53) which assigns the signals output by the rest elements to bearing points on the vehicle to be lifted.
9. Lifting platform comprising at least one rest element (2, 20) according to at least one of the proceeding claims 1 - 6.

Images