CN115697878A

CN115697878A - Elevator installation

Info

Publication number: CN115697878A
Application number: CN202180043269.6A
Authority: CN
Inventors: 阿图尔·卡特科; 斯特凡·坦纳特; 斯特凡·克奈斯勒; 菲利普·吕斯; 托马斯·库泽拉
Original assignee: ThyssenKrupp Elevator Innovation and Operations GmbH
Current assignee: TK Elevator Innovation and Operations GmbH
Priority date: 2020-06-17
Filing date: 2021-06-15
Publication date: 2023-02-03
Also published as: EP4168344A1; WO2021254997A1; DE102020115998A1

Abstract

The invention relates to an elevator installation (1) comprising: -a car (5) movably accommodated in an elevator hoistway (4) and driven in particular by a primary drive (6), -a safety brake (9), wherein the safety brake (9) can be switched between a readiness position and a braking position, wherein the safety brake in the braking position brings about a standstill of the car (5), -an auxiliary drive (7) having a recuperation bearing means (75), in particular a recuperation traction bearing means or a recuperation thrust bearing means (55), arranged to temporarily transfer a load via a recuperation interface (55) of the car (5), wherein the elevator installation (1) is arranged to switch the safety brake (9) from the braking position into the readiness position depending on an operating state of the recuperation interface (55).

Description

Elevator installation

Technical Field

The invention relates to an elevator installation.

Background

DE10 2014 220 966 A1 discloses an elevator installation in which a plurality of cars are operated cyclically in a cyclic manner, similar to a bucket elevator. Unlike a classical bucket elevator, each car drives independently of the others and can therefore stop at any stop independently of the others. The switching unit is provided for switching the car from a vertical travel path to a horizontal travel path in order to finally switch the car between different vertical travel paths. The drive is effected by means of a linear motor. German patent application 10 2019 200 665.5 describes such an elevator installation, which is instead provided with a rack gear.

The car of such an elevator installation is significantly more complex than in the case of the conventional elevator installations. In this respect, measures are required for the case where the car cannot operate. In this case, the car must be removed smoothly from the travel route in order to maintain the operation of the elevator installation with the remaining cars.

For this purpose, it is conceivable to recover the car with an auxiliary drive in order to transfer it into the maintenance area. However, it is to be taken into account here that in the case of a recovery situation the inoperative car is fixed in the shaft by means of the activated safety brake.

The safety brake is provided in particular for fixing the car in a vertical shaft or in a vertical travel path.

Disclosure of Invention

The object of the invention is to improve the functionality of an elevator installation of the type mentioned at the outset. This object is achieved by an elevator installation according to claim 1; the embodiments are the subject matter of the dependent claims and the description.

The elevator installation of the invention comprises in particular: at least one car, which is driven along a travel path, in particular by means of a main drive. The elevator installation comprises a safety brake, which is provided for braking the car. In the ready position, the safety brake allows the car to move along the travel path; in the braking position, the safety brake prevents movement along the travel path.

The invention is particularly applicable to elevator installations having a shaft height of at least 100m, in particular at least 200m, in a first direction, in particular in a vertical direction.

The invention is particularly applicable to elevator installations having a maximum car speed of the car of at least 8m/s, in particular at least 9m/s or 10m/s, in a first direction, in particular in the vertical direction.

In one embodiment, the safety brake comprises a braking element which can be transferred between a readiness position and a braking position. In particular, the car is guided on at least one guide rail by means of guide rollers; the braking element is in frictional contact with one of the guide rails in its braking position.

In one embodiment, the braking element is transferred into the braking position after an initial actuation by the actuator; subsequently, the braking element is further held in the braking position by interaction with the guide rail. In particular, the safety brake is arranged such that a resetting of the actuator during a braking process does not result in a displacement of the braking element out of the braking position.

In one embodiment, the actuator can be provided for shifting the safety brake from the braking position into the readiness position also for resetting. In this embodiment, it is possible for the bridging actuator of the bridging device to be simultaneously the release actuator of the safety brake.

In particular, the safety brake is arranged such that activation positively leads to a stop of the car, in particular for disaster avoidance. In this respect, the safety brake is in principle different from a service brake, which is arranged to temporarily reduce the speed during operation or to firmly fix the car in a parking position during a floor stop.

The invention is particularly applicable to an elevator installation having a plurality of travel paths each associated with a guide rail, which elevator installation has at least one switching device provided for switching the car from a first travel path to a second travel path.

The switching device comprises in particular at least one movable, in particular rotatable, guide rail; in particular, the movable toothed rack can be moved synchronously with one of the movable guide rails.

In one embodiment, the release force is applied to the safety brake as required. The release force is in particular dimensioned such that the safety brake is transferred from the braking position into the readiness position.

The car is driven in particular by a linear drive as the main drive.

The recovery bearing device is especially a recovery traction bearing device. The retrieval load-bearing device is in particular a load-bearing rope or a load-bearing belt. Alternatively, the recovery bearing means may be a recovery thrust bearing means, in particular a connecting rod.

In particular, the retrieval load bearing device is inoperative during normal operation of the main drive and is used to support the car in the event of a failure of the main drive.

If in one case the jumper has a failure, the jumper function is immediately cancelled. This may occur, for example, when the hydraulic line leaks. Then, even in the loaded state, the safety brake can be switched to the braking position again, so that the safety state is achieved.

In one embodiment, the auxiliary drive comprises a stationary winch with a traction cable. As a function vehicle, in particular an emergency carriage can be coupled to the retrieval carriage in order to guide the pulling cable at least during the fall. In this case, a coupling hook is provided, in particular, at the end of the rope that can be lowered, by means of which coupling hook the rope can be coupled to the car. The function vehicle can be moved by a linear drive.

This embodiment has the advantage that the car can be towed smoothly, wherein the weight force of the car is transmitted via the traction ropes and the winch during the towing process. In contrast to the variant in which the car is towed by a winch arranged above the car without the use of an emergency carriage, there is no risk here that the traction ropes start to swing when they fall towards the defective car. On the one hand, damage to components in the elevator shaft in the event of a collision with a freely swinging coupling hook on the end of the traction rope is thus avoided. On the other hand, it is ensured that the coupling hook reaches the car in a well-defined position. Therefore, the coupling hook can be smoothly engaged with the coupling member of the car. The emergency carriage is then used only as a guide system in order to guide the traction rope and the coupling hook in a targeted manner to the defective car. In principle, in this embodiment it is also possible to dispense with the second rail system and to move the emergency carriage along the first rail system.

Drawings

The invention is explained in detail below with the aid of the figures. Therein are respectively schematically shown

Fig. 1 partially shows an elevator installation according to the invention in a perspective view;

fig. 2 shows a detail of a car of an elevator installation according to fig. 1 with an activated safety brake;

fig. 3 shows the car of the elevator installation according to fig. 1 in a recovery situation;

fig. 4 shows a further embodiment of the car of the elevator installation according to fig. 1 in a recovery situation;

fig. 5 shows a further embodiment of the car of the elevator installation according to fig. 1 in the recovery situation;

fig. 6 shows the car of the elevator installation according to fig. 1 a) during a braking state, b)

Another design in the case of recycling;

fig. 7 shows a modification of the elevator installation according to fig. 2.

Detailed Description

Fig. 1 shows a part of an elevator installation 1 according to the invention. The elevator installation 1 comprises a plurality of travel routes 2H, 2VL,2VR, along which a plurality of cars 5 are guided.

A plurality of (here, for example, two) vertical travel paths 2VL,2VR are oriented in a first direction z, along which the car 5 can be moved between different floors. Between the two vertical travel tracks 2VL,2VR, a horizontal travel path 2H is provided in a second direction y, in which the cars 5 can be moved in each case within a floor. Further, the horizontal traveling route 2H connects the two vertical traveling routes 2VL,2VR to each other. The horizontal travel path 2H is therefore also used to transfer the car 5 between the two vertical travel paths 2VL,2VR, for example in order to perform modern bucket elevator operation. In the elevator installation 1, further horizontal travel paths 2H are provided which connect two vertical travel rails to one another. Furthermore, other vertical travel routes, not shown, may be provided.

Guide rails

22V, 22H, 22B for guiding the car are provided along the travel route. The car 5 has guide rollers 51 for guiding on the guide rails.

Via the switching device 3 with the two switching units 30, the car 5 can be switched between one of the vertical guide rails 2VR, 2VL and the horizontal guide rails 22H and 7 or between two vertical guide rails, respectively. The switching unit 30 has a movable guide rail 22B, which is rotatable in the present case.

The elevator installation has a main drive 6, by means of which the car is driven during normal operation. The main drive 6 is designed in particular as a linear drive and has a stator 61 mounted in the elevator hoistway and a mover 62 mounted on the car 5.

In the present embodiment, the vertical direction and the horizontal direction are only one example of the first or second direction.

All guide rails are mounted at least indirectly in the wall of the shaft. Up to this point, the elevator installation corresponds to the basis described in WO 2015/144781 A1 and DE10 2016 211 997A1 and DE10 2015218 075A1.

Details of the car are described in detail with reference to the other figures. The invention uses a safety brake 9 which can stop the car 5 in an emergency. The safety brake 9 comprises a brake element 91, here for example in the form of a brake wedge 91, which is movably held in a housing 93. Fig. 2 shows the safety brake 9 and the brake element 91 in the braking position, respectively. In this case, the braking element 91 is loaded upward with a storage force S by an energy store (e.g., a spring) 95 and comes into contact with the support surface 92. As a result, the braking element is loaded in the direction of the vertical guide rail 22V and is therefore in frictional contact therewith. As a result, a wedging action is generated between the braking element 91 and the guide rail 22V, which results in an emergency stop of the car 5. The design of fig. 2 comprises, by way of example and only optionally, two such braking elements 91, which are arranged on opposite sides of the guide rail.

For comparison: fig. 3 shows the safety brake 9 and the brake element 91 in the ready position, respectively, in which no braking action takes place. In the stand-by position when the cabin is travelling along the guide rails in normal operation.

The upward displacement of the brake wedges is triggered by a manipulator 94, as is described, for example, in WO2018/060751 A1. The manipulator 94 is connected to the braking element 91 via a connector 96. Movement of the connector in the triggering direction causes movement of the braking element from the ready position to the braking position.

The car 5 can be driven by an auxiliary drive 7 if required. The auxiliary drive device 7 is used to recover the car 5 when the main drive device 6 fails, for example. The auxiliary drive has a recovery carrier 75, which may be a rope or belt, for example, and is driven by a recovery motor 71 and a drive disc 72. The retrieval load bearing device 75 is connected to the retrieval interface 55 of the car 5 in a retrieval situation. The recovery carriage 75 is not connected to the car in normal operation. The retrieval load bearing device 75 may be a load bearing line with a crane hook; the recovery interface 55 can include a hoist ring into which a crane hook can be engaged. The suspension ring itself can be designed to be removable.

Fig. 2 shows the recycle interface 55 in a wait state. Fig. 3 shows the recycling interface 55 in a loaded state. In the waiting state, no load transfer is performed between the recovery interface 55 and the recovery bearer 75; in particular, if the recovery interface 55 is not connected to a recovery bearer, the recovery bearer is always in a standby state. In order to transfer the retraction interface 55 from the waiting state into the loaded state, the retraction interface 55 in this example comes into contact with the load stop 56 by being acted upon by a force by the retraction carriage 75.

In the case of recovery, the car 5 should be recovered and moved further even if the safety brake was previously activated. In order to deactivate the safety brake 9 temporarily, the elevator installation 1 has a bridging device 8.

The bridging device 8 comprises a bridging actuator 81 which is provided for applying a release force L to the safety brake 9. The release force L may act in opposition to the stored force S of the accumulator 95. Thereby, the safety brake 9 is released and the car 5 can be towed.

The first crossover actuator 81 is coupled to the recovery interface 55. For this purpose, a bridging trigger 82 is provided, which is provided to provide an actuating force B for actuating the actuator 81. For this purpose, a jumper connection 83 is provided between the jumper trigger 82 and the jumper actuator 81.

In this case, the jumper trigger 82 is operatively connected to the recovery interface 55, so that the actuating force B is only available when the recovery interface 55 is in the loaded state. In this case, the retrieval interface 55 and retrieval load bearing device are now at least partially loaded by the weight of the car 5, provided that the car 5 is attached to the retrieval load bearing device 75.

If the actuating force is removed (for example by breaking a bridging connection or by breaking the recovery carriage), the recovery receiver automatically again automatically switches to the standby state. The automatic return to the waiting state can be effected by a return spring 57 on the recovery interface or by means of a spring 95 or a bridging device of the safety brake 9. The bridging function is automatically cancelled and the safety brake 9 is transferred back into the braking position again. Thus, the safety brake 9 can also be used as a safety brake during the recovery process. A limit value FG, from which the load FL transmitted to the recovery connection 55 is to be brought into a loaded state, can also be set by means of the return spring 57 and/or other springs.

In the exemplary embodiment according to fig. 2 and 3, the bridging device is hydraulically designed. The crossover actuator 81 and the crossover trigger 82 are each formed by hydraulic cylinders which are connected to one another via a hydraulic line 83 as a crossover connection. The actuating force B and the release force L can be adjusted by a suitable choice of the bore cross section of the cylinder.

In the embodiment according to fig. 4, the bridging device is implemented with a rope drive. The bridge actuator has a lever arrangement, by means of which the transmission ratio between the actuating force B and the release force L can be set. The structure and function also correspond to the embodiments according to fig. 2 and 3.

The car can comprise a carriage and a cabin, for example as described in WO 2018/234211 A1. The recovery interface may be provided on said cabin or on said carriage, for example.

In fig. 2 to 4, the recovery carriage 75 is configured as a traction carriage. Likewise, the retrieval bearing device can also be configured as a thrust bearing device, in particular as a push rod. Fig. 5 shows a corresponding design in the loaded state as a variant of the design according to fig. 2. The retrieval carriage 75 can in this case be brought into engagement with the retrieval interface 55, wherein the retrieval interface 55 is transferred by the retrieval carriage 75 from the waiting state into the loaded state by applying a pushing force. The other functions are then as described above. Both the hydraulic cross-over 8 according to the drawing and the mechanical cross-over according to fig. 4 can be used, which each need to be slightly adapted.

The thrust bearing means according to fig. 5 may be a hydraulically driven push rod. In one embodiment, the thrust-carrying device is connected to a separate vehicle 52, in particular to a further cabin or a functional vehicle, which can be moved in the shaft.

Similarly, in the embodiment according to fig. 2 to 4, the traction support device 75 can also be connected to the separate vehicle 52 instead of the auxiliary drive, which then pulls the cabin.

A further embodiment is described with reference to fig. 6a and 6 b. Fig. 6a shows the hydraulic diagram of the car with the safety brake 9 in the braking state. The safety brake 9 has a brake element 91 (e.g. a brake disc) which is held in a braking position relative to the guide rail 22 by the spring force of a spring 95 (fig. 6 a). A release actuator 97 in the form of a hydraulic cylinder can selectively provide a release force L (fig. 6 b) acting counter to the spring force S and thus transfer the safety brake 9 and the brake element 91 from the braking position into the readiness position.

In this embodiment, a manipulator 94 is also provided, which can hold the brake in the ready position. The manipulator 94 comprises in particular a hydraulic device.

The manipulator 94 has a hydraulic pump 941, which can be driven by an electric motor M, for example. Alternatively, the kinetic energy for driving the pump can also be derived from the driving movement of the cabin (similar to a bicycle generator). A valve arrangement 942 with switching valves 942a, b, c, throttles 942d, e and a non-return valve 942f is provided, according to which different operating states can be adjusted. An accumulator 943 is provided in order to keep the hydraulic medium under pressure, so that the pump does not have to be operated continuously. The release actuator 97 is loaded by the hydraulic medium such that it provides a release force L which overcomes the stored force S of the spring 95.

Fig. 6a shows the device in a braking state. Due to the position of the valve in the valve arrangement 942, no hydraulic medium is applied to the release actuator, so that it cannot provide the required release force L. The braking element 91 is thus loaded into the braking position by the spring 95. The release actuator is decoupled from the pressure accumulator 943 and the pump 941. The hydraulic medium in the release actuator may flow freely out into the reservoir 944. In the ready position (not shown), the valves of valve arrangement 942 are switched such that accumulator 943 is connected to release actuator 97. In particular, the two switching valves 942a, b are switched into different switching positions than the respective switching positions shown in fig. 6 a.

Fig. 6b shows the device in a loaded state. In this case, the recovery interface 55 is transferred into the load state. As in the previous embodiment, the braking element 91 or the brake 9 is loaded into the release position by means of the bridging device 8,

here, a hydraulic cross-over trigger 82 in the form of a hydraulic cylinder is actuated, which loads the release actuator 97 into the release position. Thus, the release actuator 97 similarly constitutes the bridge actuator 81. Here, the switching valve 942c prevents an undesired outflow of hydraulic medium from the crossover actuator 81.

In this embodiment, safety during the towing process is also ensured. If a malfunction of the actuator 94 or of the bridging device 8 occurs, the pressure in the hydraulic medium on the release actuator 97 or the bridging actuator 81 and thus the release force are cancelled. The spring 95 can then shift the braking element into the braking position again.

In fig. 6, a device with a thrust bearing device is shown. Alternatively, even with slight adjustment (compare fig. 5 and 2), such a device can be realized when a traction support device is used.

Fig. 7 shows a supplement to the elevator installation according to fig. 2. The second rail system 27 extends on the lateral shaft wall 14 b. The function vehicle 52, in particular the emergency carriage, can be moved along the rail 22. A winch 71 is arranged above the car 15, by means of which winch the traction carrying means 75 can be lowered to the car 15. On the car-side end of the traction support 75, a coupling hook 751 is arranged, with which the traction support 75 can be coupled to the retrieval opening 55 of the car 5. In the coupled state, the car 5 can be towed (i.e., pulled up or dropped down in the elevator hoistway) by means of the winch 71. To prevent the traction support from starting to swing when falling down towards the car 5, the traction ropes 73 can be coupled to the functional vehicle 29. For this purpose, the utility vehicle 52 has a guide 752, which ensures that the traction support 75 is guided at least in the horizontal direction.

On the one hand, damage to components in the elevator shaft 21 in the event of a collision with the freely swinging coupling hook 75 on the end of the traction rope 73 is thus avoided. On the other hand, it is ensured that the coupling hooks 751 reach the car 15 in a well-defined position. Therefore, the coupling hook 75 can be smoothly engaged with the coupling portion 67 of the car 15. The emergency carriage 29 thus serves as a guide system for the targeted guidance of the traction ropes 73 and the coupling hooks 75 to the defective car 15. In principle, in this embodiment it is also possible to dispense with the second rail system 27 and to move the emergency carriage 29 along the first rail system 13.

Description of the reference numerals

1 Elevator installation

2H horizontal driving route

2VL,2VR vertical driving route

22V fixed vertical guide rail

22H fixed horizontal guide rail

22B movable guide rail

75 retrieve carrier

3 switching device

30 switching unit

4 elevator shaft

5 cage

51 guide roller

52 individual vehicle

527 guiding device

55 recovery interface

56 load stop

57 return spring

6 Main driving device

61 stator

62 mover

7 auxiliary driving device

71 recovery motor

72 drive disk

75 retrieve carrier

751 coupling hook

8 bridging device

81 bridge actuator

82 bridging flip-flop

83 bridging connection

9 safety brake

91 movable brake wedge

92 support surface

93 brake housing

94 manipulator

941 pump

942 valve arrangement

942a-c switching valve

942d-e throttle valve

942f check valve

944 reservoir

95 spring

96 connector

97 Release actuator

S storage force

L Release force

Operating force B

Load transferred by FL

FG limit value

Claims

1. An elevator installation (1) comprising:

a car (5) which is movably accommodated in the elevator shaft (4) and is driven in particular by means of a main drive (6),

a safety brake (9), wherein the safety brake (9) can be switched between a readiness position and a braking position, wherein the safety brake in the braking position brings about a standstill of the car (5),

an auxiliary drive (7) having a recuperation bearing device (75), in particular a recuperation traction bearing device or a recuperation thrust bearing device, arranged to temporarily transfer the load through a recuperation interface (55) of the car (5),

it is characterized in that the preparation method is characterized in that,

the elevator installation (1) is designed to switch the safety brake (9) from a braking position into a standby position as a function of an operating state of the recovery interface (55).

2. Elevator installation (1) according to the preceding claim,

it is characterized in that the preparation method is characterized in that,

the recovery interface (55) being capable of switching between at least two operating states, a waiting state and a load state,

wherein, in the loaded state, the weight force of the car (5) is transmitted at least partially, in particular above a limit value, to the retrieval load carrier (75) via the retrieval interface (55).

3. Elevator installation (1) according to the preceding claim,

it is characterized in that the preparation method is characterized in that,

when the recycling interface (55) is separated from the recycling carrying device (75)

And/or

When the load (FL) transmitted to the recycling carrier (75) via the recycling interface (55) is below a predetermined limit value (FG),

a wait state is obtained.

4. Elevator installation (1) according to one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

functionally, a bridging device (8) is arranged between the recovery connection (55) and the safety brake (9),

wherein the bridging device (9) is configured to apply a release force (L) to the safety brake depending on the operating state of the recovery interface (55).

5. Elevator installation (1) according to the preceding claim and claim 2,

it is characterized in that the preparation method is characterized in that,

the bridging device (8) is arranged to provide a release force (L) when the recovery interface (55) is in a loaded state.

6. Elevator installation (1) according to claim 4 or 5,

it is characterized in that the preparation method is characterized in that,

the jumper (8) has a jumper actuator (81) and a jumper trigger (82).

7. Elevator installation (1) according to the preceding claim,

it is characterized in that the preparation method is characterized in that,

the jumper trigger (82) is provided for providing an actuating force (B) for the jumper actuator (81) depending on the operating state of the recovery connection (55), in particular when the recovery connection (55) is in the loaded state,

wherein the bridging actuator (81) is designed to provide a release force (L) for the safety brake (9) in the presence of an actuating force (B).

8. Elevator installation (1) according to one of the claims 4 to 7,

it is characterized in that the preparation method is characterized in that,

the elevator system is provided for transferring the safety brake (9) into the braking position during a load state and for retaining the safety brake in the braking position if the bridging device (9) has a fault.

9. Elevator installation (1) according to one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the safety brake (9) comprises a braking element (91) which can be transferred between a readiness position and a braking position,

in particular, the braking element (91) is transferred into the braking position after an initial actuation by the actuator (94) and then remains in the braking position by interaction with the guide rail (22).

10. Elevator installation (1) according to one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the recovery carrier is a traction carrier, in particular a carrier rope or a carrier belt.

11. Elevator installation (1) according to one of the claims 1 to 9,

it is characterized in that the preparation method is characterized in that,

the recovery bearing means are thrust bearing means, in particular connecting rods.

12. Elevator installation (1) according to one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the car comprises an actuator (94), wherein the actuator (94) is provided for the transfer of the safety brake (9) from the readiness position and into the braking position.

13. Elevator installation (1) according to the preceding claim,

it is characterized in that the preparation method is characterized in that,

the manipulator (94) is provided for the transfer of the safety brake (9) from the braking position into the readiness position.

14. Elevator installation (1) according to the preceding claim,

it is characterized in that the preparation method is characterized in that,

the safety brake (9) comprises a release actuator (97) which is provided to transfer the brake element (91) from a braking position into a ready position after actuation by the actuator (94).

15. Elevator installation (1) according to the preceding claim and claim 6 or 7,

it is characterized in that the preparation method is characterized in that,

the bridge actuator (81) constitutes the release actuator (97).

16. Elevator installation (1) according to the preceding claim,

it is characterized in that the preparation method is characterized in that,

the safety brake (9) is arranged to be transferred from a braking position into a readiness position by hydraulic actuation and/or by mechanical actuation.

17. Elevator installation (1) according to one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the recovery support device (55) is a traction support device which can be mounted on the car (5) from above, wherein a functional vehicle (52) is provided which can be moved in the elevator shaft and which is provided to guide the traction support device at least in the horizontal direction when the traction support device is moved towards the car.

18. Elevator installation (1) according to one of the preceding claims, comprising

A plurality of travel paths having respective guide rails (2VL, 2VR, 2H),

at least one switching device (3) which is provided for switching the car from a first travel path to a second travel path,

the switching device (3) comprises in particular at least one movable, in particular rotatable, guide rail (22B).

19. Method for modernizing an elevator installation according to one of the preceding claims, wherein in a modernization situation the car cannot travel, in particular the main drive cannot move the car, and wherein in a modernization situation the safety brake is in the braking position;

the method comprises the following method steps:

an auxiliary drive device (6) is provided,

the auxiliary drive (6) is connected to the retraction interface of the car (5) after a retraction situation,

wherein the safety brake is switched from the braking position into the release position depending on the operating state of the recovery interface.