JP2002104788A - Ascending/descending device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ascend/descend a heavy object with a short stroke by a simple structure. SOLUTION: In this ascending/descending device, a hydraulic cylinder 20 for driving an ascending/descending action is disposed directly below a close part of one corner apex portion of a placing stand 18. On each of two side surfaces 18a, 18b adjoining the one corner apex portion and a side surface 18c opposite to the side surface 18a, balance chain 24 fixed at both ends is wrapped on a sprocket 22b far from the hydraulic cylinder 20 from the lower side, and wrapped on the other sprocket 22a from the upper side. Therefore, the placing stand 18 can be ascended/descended while keeping horizontality thereof only by one hydraulic cylinder 20, three balance chains 24, and two sprockets 22 for each chain 24, so that a vehicle that is the heavy object can be ascended/descended by a simple mechanism and the minimum required structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device for lifting a heavy object with a short stroke.

[0002]

2. Description of the Related Art As a device for raising and lowering a heavy object with a short stroke, there is known a driving means for performing a linear motion by pressure oil and generating a force proportional to an effective sectional area and a differential pressure. Is widely used because it is simple.

However, when a heavy object placed on a flat plate is lifted by a single driving means, a complicated link mechanism for simultaneously transmitting the driving force to a plurality of portions of the flat plate is required. Due to the complexity, there is a problem that the weight of the link mechanism becomes considerably large.

When a heavy object placed on a flat plate is lifted by a total of four driving means arranged at four corners of the flat plate, it is necessary to operate the driving means in synchronization with each other. As a result, there is a problem that it is difficult to control such a tuning operation, and it is difficult to realize the tuning operation with a simple mechanism.

Further, the mounting table and the base are connected by a plurality of support members, and the plurality of support members are rotated at a predetermined angle by the driving force of the motor around the support point on the base side, so that the mounting table is mounted on the mounting table. Although a technique of lifting and lowering a heavy object is also known, this technique requires a strong support member and a considerable motor driving force, and has a problem that the apparatus cost is considerably increased.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a lifting apparatus capable of lifting and lowering a heavy object with a short stroke by a simple mechanism. With the goal.

[0007]

In order to achieve the above-mentioned object, a lifting device according to the present invention comprises a flat mounting table having a substantially rectangular parallelepiped for mounting an object, and a corner near a vertex of the mounting table. A driving means fixed to a base immediately below the mounting table to move a corner vertex of the mounting table up and down, and opposing one of the two side faces adjacent to the corner vertex of the mounting table and one of the two side faces Two cars provided on each of the side surfaces to be rotatable at positions separated from each other in the longitudinal direction, and a car farther from the driving means among the two cars provided on any one of the side faces A first flexible elongate body fixed at both ends and wound around the other vehicle from above, and the two vehicles provided on the other of the two side surfaces. It is wrapped around the car far from the driving means from below,
A second flexible elongate body fixed at both ends wound around the other vehicle from above, and a lower one of the two vehicles provided on the opposite side faces, which is farther from the driving means than the driving means; And a third flexible elongated body fixed at both ends and wound around the other vehicle from above.

[0008] In the lifting device having such a configuration, two side surfaces adjacent to one corner vertex of the mounting table and two side surfaces facing either one of the two side surfaces are arranged two by two in the longitudinal direction. The car is rotatably provided at a position spaced apart along. Focusing on one of the side surfaces, a first flexible elongated body fixed at both ends is provided with a second flexible body provided on this side surface.
One of the two cars is wrapped around the car farther from the driving means from below, and the other car is wrapped around from above. It is a form that supports from.

Similarly, also on the other side of the two side surfaces, the second flexible elongated body is wound from below on the vehicle farthest from the driving means among the two vehicles provided on this side surface. The second flexible elongated body supports the vehicle far from the drive means from below, because the second flexible elongated body is supported by the other vehicle because it is wound around the other vehicle from above. Also, the third flexible elongated body supports the vehicle far from the driving means from below.

For this reason, even if the driving means is arranged only at one corner apex of the mounting table, the mounting table can be supported at four points and the balance can be maintained. In a configuration having only two flexible elongate bodies, only two side surfaces are supported, and the mounting table is supported at three points. Therefore, it is difficult to lift and lower a heavy object reliably and stably. Becomes Therefore, at least three flexible elongated bodies are required. That is, the present invention can be said to be a minimum configuration.

When one corner apex of the mounting table is lifted by the driving means in a state of being supported at four points by the configuration according to the present invention, the first, second, and third flexible elongated bodies are respectively Since the flexible elongated body is fixed at both ends, the winding positions of the two cars rise together by the length of the corner apex, and these two flexible bodies are rotated around the wound car. The horizontal position of the car is maintained. Therefore, even if one corner vertex of the mounting table is lifted, the mounting table is held horizontally. The same applies to the case where the corner of the mounting table is lowered by the driving means, and the mounting table is held horizontally.

As described above, according to the present invention, one driving means, three flexible elongated bodies, and two flexible elongated bodies are provided for each flexible elongated body.
With only one car at a time, the mounting table can be raised and lowered while maintaining the horizontal position. With a simple mechanism and the minimum required configuration, it is possible to obtain a lifting device that can lift and lower heavy objects with a short stroke. .

Further, the driving means according to the present invention may be constituted by a hydraulic cylinder. Since the hydraulic cylinder has a simple structure and is low in cost, it is possible to further simplify the structure and reduce the apparatus cost.

Further, a sprocket and a pulley can be used as the vehicle according to the present invention, and a chain, a belt, a wire rope and the like can be used as the flexible long body. Of these, it is desirable that the car be constituted by a sprocket and the flexible elongated body be constituted by a chain. That is, by adopting a structure in which the chain is wound around the sprocket, reliable and stable power transmission can be realized, and the operation of the elevating device can be further stabilized.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a lifting apparatus according to the present invention; FIG. 2 is a perspective view of a lifting apparatus according to the present invention; The parking device will be described.

[Overall Configuration of Mechanical Parking Apparatus] As shown in FIG.
A berth 3 and a berth 9 are provided. The entry berth 3 is an area where the driver enters the vehicle 2 to automatically carry the vehicle 2 into the parking device 1 and the driver gets off the vehicle. This is an area where the driver gets on the vehicle 2 and gets out of the parking device 1 by driving the driver.

A hoistway extending downward is set in front of the entrance berth 3 in the vehicle traveling direction indicated by the arrow B so as to communicate with an area beside the running path 5 on the parking floor, which will be described later. A storage lift 7a that moves up and down the hoistway is installed.

In the direction opposite to the arrow B with respect to the unloading berth 9, a hoistway extending downward is set so as to communicate with an area beside the traveling path 5 on the parking floor, which will be described later. A delivery lift 7b that moves up and down the hoistway is provided.

A single or a plurality of parking floors are set below the floor A, and a plurality of parking sections 4 for accommodating the vehicles 2 are arranged in a plurality of rows on the parking floors. A traveling path 5 is set between the rows of the parking sections 4, and a traveling vehicle 6 that runs on the traveling path 5 is arranged on the traveling path 5.

As shown in FIGS. 2 and 3, a vertical conveyor 8S for transporting the vehicle 2 after the driver gets off to the storage lift 7a is installed in the storage berth 3, and the storage lift 7a has an arrow. A longitudinal roller conveyor 12 that transports the vehicle 2 to a predetermined position along the direction B and a traverse chain conveyor 14 that transports the vehicle 2 transported to the predetermined position to the traveling vehicle 6 along the direction C are installed. Have been.

Also, as shown in FIG. 1, the delivery lift 7b includes a traversing chain conveyor 14 for transporting the vehicle 2 carried out from the traveling vehicle 6 to a predetermined position along the vehicle width direction.
A traversing roller conveyor 12 that carries the vehicle 2 conveyed to a predetermined position along the direction of arrow B to a retrieval berth 9 is installed. The retrieval berth 9 moves the vehicle 2 to a predetermined driver's boarding position. A vertical conveyor 8S for conveying is provided.

The conveyors 12 and 14 installed on the incoming lift 7a and the outgoing lift 7b constitute a vehicle transport device 10 according to the present invention, and the configuration will be described later in detail.

In addition, the traveling carriage 6 and each parking section 4 include:
Each of the traversing conveyors 8 is provided. As shown in FIG. 2, the transverse conveyor 8 includes a front wheel conveyor 8a on which the front wheels 2a of the vehicle 2 are mounted and a rear wheel conveyor 8b on which the rear wheels 2b are mounted. These conveyors 8a and 8b are known belt conveyors, slat conveyors, roller conveyors, or the like, and have the same structure.

The conveyors 8a, 8b and the traversing chain conveyor 14 are adjacent to each other as the lifts 7a, 7b move up and down and the traveling carriage 6 moves by itself (the lifts 7a and 7b and the traveling carriage 6, the traveling carriage 6). 6 and the front wheel conveyor 8a and the rear wheel conveyor 8b) of the parking section 4
They are arranged in the width direction of the vehicle. The adjacent traversing conveyors 8 are simultaneously driven in the same direction,
Are transferred in the width direction of the vehicle 2 and the vehicle 2 is transferred from one adjacent horizontal conveyor 8 to the other horizontal conveyor 8. The transfer from the traversing conveyor 8 to the traversing chain conveyor 14 and in the opposite direction is performed in the same manner.

[Outline of Vehicle Transfer Apparatus] Next, the vehicle transfer apparatus 10 according to the present invention will be described. As shown in FIG.
A vertical roller conveyor 12 for transporting the vehicle 2 in the traveling direction indicated by the arrow B and a traversing chain conveyor 14 for transporting the vehicle 2 in the vehicle width direction are installed on the receiving lift 7a. The conveyor 14 can protrude from the gap between the rollers 12a of the vertical roller conveyor 12 (FIG. 3).
(See FIG. 3B) or retractable (see FIG. 3A). This traversing chain conveyor 14 is shown in FIG.
It is arranged only near the lower part of the front wheel 2a and near the lower part of the rear wheel 2b of the vehicle 2 transported to the predetermined position shown in FIG. Similarly to the above, the delivery lift 7b is also provided with a vertical roller conveyor 12 and a horizontal chain conveyor 14 that can protrude or retreat from the gap between the rollers 12a.

As shown in FIG. 4, the vertical roller conveyor 12 comprises a plurality of cylindrical rollers 12a arranged in a line in the width direction thereof, and sprockets 12b provided at both ends of each roller 12a. A motor 12c for rotational drive;
It includes a rotating portion of the motor 12c and a chain 12d wound around the sprocket 12b and transmitting the driving force of the motor 12c to the sprocket 12b and the rollers 12a. The drive of the motor 12c is controlled by a control device 30 described later.

As shown in FIG. 5, the traversing chain conveyor 14 comprises a front wheel chain conveyor 14a for traversing the front wheels of the vehicle and a rear wheel chain conveyor 14b for traversing the rear wheels of the vehicle. Each of the chain conveyors 14a and 14b has a plurality of endless chains 14c arranged in a row in the width direction,
The sprockets 14d and 14f around which c is wound and transmit rotational driving force to each chain 14c, a motor 14e for rotational drive, and a rotational shaft of the motor 14e and a rotational shaft of the driving sprocket 14f are connected to transmit rotational drive force. And a universal joint 14g. The drive of the motor 14e is controlled by a control device 30 described later.

[Configuration of Elevating Device] Next, the elevating device 16 for elevating and lowering the traversing chain conveyor 14 will be described with reference to FIGS. The elevating device 16 has a substantially rectangular parallelepiped mounting table 18 on which the front wheel chain conveyor 14a and the rear wheel chain conveyor 14b are mounted on the upper surface, and is disposed directly below one corner 18s of the mounting table 18 to raise and lower the one corner 18s. The hydraulic cylinder 20 to be driven and the surface 1 adjacent to the corner 18s
8a and 18b and a balance chain 24 fixed to both ends wound around sprockets 22a and 22b, two of which are respectively installed on the surface 18c facing the surface 18a. In FIG. 6, the front wheel chain conveyor 14a and the rear wheel chain conveyor 14b are simply represented by a rectangular parallelepiped.

On the surfaces 18a, 18b and 18c, the balance chain 24 is hung from below on the sprocket 22b farther from the corner 18s, and supports three corners other than the corner 18s from below. Configuration. When the one corner 18s of the mounting table 18 is raised by the hydraulic cylinder 20, for example, the surface 18b transitions from the solid line state shown in FIG. 7 to the broken line state. That is,
Since the chain 24 is fixed at both ends and in a balanced state, the entire mounting table 18 is also raised by the length H in which the one-corner portion 18s is raised by driving the hydraulic cylinder 20, so that the mounting table 18 is in the parallel state. Will be retained.

The front wheel chain conveyor 14a and the rear wheel chain conveyor 14b mounted on the mounting table 18
(That is, the portion indicated by the one-dot chain line in FIG. 5) ascends and descends. However, by disposing the universal joint 14g at the connection portion with the motor 14e, the chain conveyor 14
a, 14b is absorbed.

[Configuration of Control System] Next, a configuration related to a control operation of the vehicle transport device 10 will be described with reference to FIG. The vehicle transport device 10 is provided with a control device 30 including a microcomputer. The control device 30 includes a motor 12c for driving the longitudinal roller conveyor 12, and a front wheel chain conveyor 14a. The motor 14e for driving, the motor 14e for driving the rear wheel chain conveyor 14b, the hydraulic cylinder 20, the driving unit for the entry lift 7a, the driving unit for the exit lift 7b, and the vehicle 2 are located at predetermined positions of the entry lift 7a. A weight sensor 32 for detecting that the vehicle 2 has arrived, a weight sensor 34 for detecting that the vehicle 2 has reached a predetermined position of the traveling vehicle 6,
36, an optical sensor 38 for detecting that the mounting table 18 has risen to a predetermined upper limit position indicated by a broken line in FIG.
An optical sensor 40 for detecting that the mounting table 18 has been lowered to a predetermined lower limit position indicated by a solid line in FIG. 7, a storage button 42 for instructing a start of a storage operation, a vertical conveyor 8S, and a horizontal conveyor. 8 are connected by signal lines.

The weight sensor 32 is buried in the area E of FIG. 2, the weight sensor 34 is buried in the area F1 of FIG. 2, and the weight sensor 36 is buried in the area F2 of FIG. Optical sensor 38
7 includes a light projector 38a and a light receiver 38b shown in FIG. 7, and is arranged at a position where the optical path is cut off when the mounting table 18 reaches the upper limit position shown by the broken line in FIG. Similarly, the optical sensor 40 also includes a light emitter 40a and a light receiver 40b, and is arranged at a position where an optical path is cut off when the mounting table 18 reaches a lower limit position indicated by a solid line in FIG.

The control device 30 includes weight sensors 32, 34,
36, the optical sensors 38 and 40, and the signals from the storage button 42 are taken in. The operation of the vertical roller conveyor 12 is controlled by controlling the motor 12c, and the operation of the chain conveyors 14a and 14b is controlled by controlling the motor 14e. And controls the operations of the hydraulic cylinder 20, the incoming lift 7a, the outgoing lift 7b, the vertical conveyor 8S, and the horizontal conveyor 8. The operation will be described in detail in the following operation.

Although not shown, the delivery lift 7b
Also, the vehicle 2 is unloaded from the traveling trolley 6 and the retrieval lift 7b
A weight sensor for detecting that the vehicle 2 has reached the predetermined position and a weight sensor for detecting that the vehicle 2 has been unloaded from the exit lift 7b are embedded. Reference numeral 30 controls the automatic unloading operation of the vehicle 2.

[Operation of the present embodiment] Next, as an operation of the present embodiment, the operation of the vehicle transport apparatus 10 relating to the automatic warehousing process will be described with reference to FIG.

When the driver stops the vehicle 2 at a predetermined position at the storage berth 3 and operates a predetermined storage button 42 after dismounting, the control device 30 starts execution of the processing in FIG.

In step 202 of FIG. 9, the vertical conveyor 8S is operated, and the vertical roller conveyor 12S is operated.
The motor 2c is driven to operate the vertical roller conveyor 12, and the vehicle 2 is transported in the direction of arrow B in FIG. This conveyance is continued until it is confirmed in step 204 that the vehicle 2 has reached the predetermined position G in the storage lift 7a by the detection result of the weight sensor 32 embedded in the area E.

When the vehicle 2 reaches the predetermined position G by the above-described conveyance, the weight sensor 32 detects a weight equal to or more than a predetermined value, and
The detection signal is transmitted to the control device 30. The control device 30 that has received the detection signal determines that the vehicle 2 has reached the predetermined position G, and proceeds to step 206, in which the vertical conveyor 8
S and the vertical roller conveyor 12 are stopped. Then, in the next step 207, the drive of the storage lift 7a is driven to lower the storage lift 7a to the target floor where the vehicle 2 should be parked.

In the next step 208, the hydraulic cylinder 20
Is driven to raise the traversing chain conveyor 14. This raising operation is continued until it is confirmed from the detection result of the optical sensor 38 that the mounting table 18 has risen to the predetermined upper limit position in step 210.

When the mounting table 18 rises to a predetermined upper limit position by the above-described ascent operation, the optical path of the optical sensor 38 is interrupted by the mounting table 18 that has reached that position, and the detection signal from the optical sensor 38 changes from on to off. Switch. The control device 30 recognizing this change determines that the mounting table 18 has risen to the predetermined upper limit position, proceeds to step 212, stops driving the hydraulic cylinder 20, and stops the raising operation of the traversing chain conveyor 14. Let it.

In the next step 214, the traversing conveyor 8 of the traveling vehicle 6 is operated, and the motors 14e of the traversing chain conveyors 14a, 14b are driven to operate the traversing chain conveyors 14a, 14b, thereby to operate the vehicle 2
Is transported in the direction of arrow C in FIG. This conveyance is continued until it is confirmed in step 216 that the vehicle 2 has reached the predetermined position H based on the detection results of the weight sensors 34 and 36.

When the vehicle 2 reaches the predetermined position H by the above-described transport, the weight sensors 34 and 36 detect a weight equal to or more than a predetermined value, and transmit a detection signal to the control device 30. Control device 30 having received this detection signal indicates that vehicle 2 has been moved to predetermined position H
Is reached, the process proceeds to step 218, and the traversing conveyor 8 and the traversing chain conveyors 14a and 14b are stopped.

In the next step 220, the hydraulic cylinder 20
Is driven to lower the traversing chain conveyor 14. This lowering operation is continued until it is confirmed in step 222 that the mounting table 18 has been lowered to the predetermined lower limit position by the detection result of the optical sensor 40.

When the mounting table 18 is lowered to a predetermined lower limit position by the above-described lowering operation, the optical path of the optical sensor 40 is interrupted by the mounting table 18 that has reached that position, and the detection signal from the optical sensor 40 changes from on to off. Switch. The control device 30 that recognizes this switch determines that the mounting table 18 has been lowered to the predetermined lower limit position, proceeds to step 224, stops driving the hydraulic cylinder 20, and stops the lowering operation of the traversing chain conveyor 14. Let it.

As described above, according to the present embodiment, when the vehicle 2 is conveyed to the predetermined position G in the storage lift 7a by the traversing roller conveyor 12, the control device 30
Makes the traversing chain conveyor 14 protrude from the gap of the traversing roller conveyor 12, and conveys the vehicle 2 in the protruding state in the vehicle width direction by the traversing chain conveyor 14,
After the transfer is completed, the traversing chain conveyor 14 is retracted by the elevating device 16, so that the operation of projecting the traversing chain conveyor 14 can be automated and stabilized, thereby preventing inconvenience due to human error and saving labor. Can be achieved.

Further, when the transport by the traversing chain conveyor 14 is performed, the traversing chain conveyor 14 is configured to protrude from the gap between the traversing roller conveyors 12, so that the vehicle can be mounted with a simple mechanism without taking up space. 2
Can be transported in any direction.

Further, since the traversing chain conveyor 14 is arranged only near the lower part of the front wheel position and the lower part of the rear wheel position of the vehicle 2 conveyed to the predetermined position G, the conveyance in the vehicle width direction is performed. While realizing, the configuration of the traversing chain conveyor 14 for performing such conveyance can be suppressed to a necessary minimum, and the cost and weight of the apparatus can be reduced.

Further, regarding the lifting / lowering device 16, one hydraulic cylinder 20, three balance chains 24,
With only two sprockets 22 for each chain 24, the mounting table 18 can be raised and lowered while maintaining the horizontal position. With a simple mechanism and a minimum required configuration, a heavy vehicle can be raised and lowered. it can.

In addition to the hydraulic cylinder, a motor or the like can be used as the lifting / lowering drive means. However, in the above embodiment, the lifting / lowering drive means is constituted by the hydraulic cylinder 20 having a simple structure and a low cost. The structure can be simplified and the cost of the apparatus can be reduced.

Further, as the driving force transmitting means for raising and lowering, a configuration in which a belt is wound around a pulley can be adopted. However, in the above-described embodiment, since the balance chain 24 is wound around the sprocket 22, a reliable and stable power can be obtained. Transmission can be realized, and the operation of the elevating device can be further stabilized.

The sensor for detecting that the vehicle has reached the predetermined position in the lift or the predetermined position of the traveling trolley is not limited to the weight sensor, but may be an optical sensor or a limit switch. .

The sensor for detecting that the mounting table has moved up to the predetermined upper limit position or lowered to the predetermined lower limit position is not limited to an optical sensor, but detects that the mounting table has passed a predetermined position. A limit switch or the like may be employed.

[0053]

As described above, according to the present invention,
When one corner vertex of the mounting table is moved up and down by the driving means, the first, second, and third flexible elongated bodies respectively rotate around the wound vehicle, but are fixed at both ends. In each flexible elongate body, the winding positions of the two cars rise together by the length of the one corner apex raised, and the horizontal positional relationship between these two cars is maintained, and the mounting table is held horizontally. Therefore, with only one driving means, three flexible elongated bodies, and two cars for each flexible elongated body, it is possible to move up and down while keeping the mounting table horizontal, With a simple mechanism and a minimum required configuration, it is possible to obtain a lifting device capable of lifting and lowering a heavy object with a short stroke.

If the drive means is constituted by a hydraulic cylinder, the hydraulic cylinder has a simple structure and is low in cost, so that the structure can be further simplified and the cost of the apparatus can be reduced.

Further, if the vehicle is constituted by a sprocket and the flexible elongated body is constituted by a chain, and the chain is wound around the sprocket, a reliable and stable power transmission can be realized, and the operation of the lifting device can be improved. Further stabilization can be achieved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing the entire configuration of a mechanical multi-story parking device according to an embodiment of the present invention.

FIG. 2 is a plan view showing an arrangement of a vehicle transport device, a vertical conveyor, and a horizontal conveyor.

FIG. 3A is a diagram illustrating a state in which the traversing chain conveyor is retracted between the vertical roller conveyors, and FIG. 3B is a diagram illustrating a state in which the traversing chain conveyor protrudes from between the vertical roller conveyors. FIG.

FIG. 4 is a schematic configuration diagram of a vertical roller conveyor.

FIG. 5 is a schematic configuration diagram of a traversing chain conveyor.

FIG. 6 is a schematic configuration diagram of a lifting device.

FIG. 7 is a view for explaining the elevating operation of the mounting table of the elevating device and the arrangement of the optical sensors.

FIG. 8 is a block diagram showing a configuration of a control system.

FIG. 9 is a flowchart showing an automatic warehousing process.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mechanical three-dimensional parking device, 2 ... Vehicle, 7a, 7b ... Lift, 10 ... Vehicle conveyance device, 12 ... Roller conveyor for traversing, 14 ... Chain conveyor for traversing, 16 ... Elevating device,
18 mounting table, 20 hydraulic cylinder, 22 sprocket, 24 balance chain, 30 control device

Claims (3)

[Claims] 1. A substantially rectangular parallelepiped flat mounting table for mounting an object, fixed to a base immediately below a corner of a corner of the mounting table,
Driving means for vertically moving a corner apex of the mounting table; two side faces adjacent to the corner apex of the mounting table;
A car rotatably provided at a position spaced apart along the longitudinal direction by two on each of the side faces facing one of the two side faces, and two cars provided on the one of the side faces A first flexible elongate body fixed at both ends, which is wound from below on a car farther from the driving means of the car and wound on the other car from above, and the other of the two side faces, A second flexible elongate body fixed at both ends, which is wound from below on a car farther from the driving means out of the two cars provided on the side, and is wound on the other car from above, A third flexible elongate body fixed at both ends, which is wound from below on a car farther from the driving means among the two cars provided on opposing side faces, and wound on the other car from above; A lifting device having: 2. The lifting device according to claim 1, wherein said driving means is a hydraulic cylinder. 3. The lifting device according to claim 1, wherein the vehicle is a sprocket, and the flexible elongate body is a chain.