JPH05112180A - Elevating device - Google Patents

Abstract

PURPOSE:To provide an elevating device, of which platform is formed so as to be a step-shape at the time of getting on/off of passengers and so as to be expanded to a flat plate-shape in the case of getting on/off of a wheelchair and which can be installed on a low-floor type vehicle. CONSTITUTION:In this elevating device to be installed to a getting on/off port 3 of a low-floor type vehicle, a platform 17 is formed so as to be a step-shape at the time of getting on/off of passengers and so as to be expanded to a flat plate-shape by an expanding flat link mechanism 20 in the case of getting on/off of a wheelchair. An extension plate 70 is projected with a lower frame 38 in the tip side of the platform 17 to form a platform structure having a sufficient depth dimension, and the platform structure is driven to be elevated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating device which is attached to an entrance / exit of a passenger vehicle such as a bus and which facilitates the elevating operation of a wheelchair or the like by elevating the platform.

[0002]

2. Description of the Related Art Conventionally, when a wheelchair lifting device is provided in a passenger vehicle such as a bus, an opening is provided separately from an entrance / exit for passengers to get in and out of the vehicle, and the wheelchair lifting device is provided in this opening. I was doing. This is because the conventional wheelchair elevating device has a structure that cannot be used for ordinary passengers getting on and off because it simply elevates and lowers a plate-shaped platform.

For this reason, when the wheelchair lifting device is stored, the space volume inside the vehicle becomes narrower, and a passage is required at the opening, so that the passage and seats in the room are functionally inconvenient. ..

In view of this point, the applicant of the present invention has filed Japanese Utility Model Application No. 2-9.
No. 9854 proposes an elevating device that can be used as a staircase platform for passengers getting on and off, and in the case of a wheelchair or the like as a flat plate-shaped platform.

[0005]

By the way, in a low floor type bus or the like, there is a problem that a sufficient depth dimension for a wheelchair or the like cannot be secured even when the platform is in a flattened state (if there is a large step in the stairs. , When the platform is expanded from a staircase to a flat plate, the depth can be increased, but if the steps of the stairs are small, the depth dimension cannot be increased even if expanded to a flat plate.)

In view of the above points, the present invention makes the platform stepwise when passengers get on and off, and in the case of a wheelchair or the like, puts the platform into a flat developed state and presses the extension plate toward the tip end side of the platform. It can be installed in a low-floor passenger vehicle without providing a special opening by securing a sufficient depth dimension by putting it out.
Therefore, an object of the present invention is to provide a lifting device that can effectively arrange the passages and seats in the room without deteriorating the transport function, and that is compact and can reduce the installation space.

[0007]

In order to achieve the above object, the lifting device of the present invention comprises: (a) a fixed main body frame fixed to the entrance / exit side of a vehicle; and (b) with respect to the fixed main body frame. A pair of fixed posts that are vertically erected vertically, and (c) movable posts that are respectively movable up and down on the pair of fixed posts, and (d) an elevating cylinder that drives the movable posts up and down. ) A cross member for connecting between the lower ends of the pair of movable posts, and (f)
A platform having a first step plate fixed to the cross member side, a connecting plate having one end pivotally attached to the tip of the first step plate, and a second step plate pivotally attached to the other end of the connecting plate, (G) A compression arm and a tension arm, each of which has one end pivotally supported on the movable post side and forms a parallel link having a turning radius longer than the turning radius of the connecting plate, and the other end of the compression arm and the tension arm. And a lower frame pivotally attached to each other, and by providing the second step plate on the lower frame, the first and second step plates of the platform and the connecting plate are stepwise bent. A link mechanism for deployment, which is in a flat plate-like deployed state and pushes the front part of the lower frame toward the tip side of the platform during deployment. The expansion cylinder for rotating the (h) the expansion link mechanism, the extension plate positioned protruding portion (Li) said low earth frame,
It has a configuration with.

[0008]

In the lifting device of the present invention, the platform has a structure in which the step plate and the connecting plate are sequentially connected,
Further, a lower frame provided with an extension plate can be pushed out to the tip side of the platform.
When the passengers get on and off normally, the platform is in a staircase shape and the extension plate is in a retracted state, and in the case of a wheelchair or the like, the platform is in a deployed state, that is, the tread plate and the connecting plate are in a flat plate shape and the extension plate is provided. With the lower frame projecting, the platform structure with sufficient depth (that is, the combined structure of the platform and extension plate) is moved up and down. Therefore, it can be mounted on a normal entrance / exit of a low-floor type vehicle with few steps on the stairs, and can be lifted up and down with a wheelchair or the like placed. In addition, lifting and lowering of the platform that became a flat plate,
This can be performed by driving the movable post that can slide vertically with respect to the fixed post with the lifting cylinder, and it does not move laterally when the platform moves up and down, allowing you to get on and off the wheelchair in a narrow space. Is.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a lifting device according to the present invention will be described below with reference to the drawings.

1 to 9 show the structure of an elevating device, and FIG. 10 shows a shared bus 1 as a vehicle in which the elevating device is mounted.
Here is an example:

As shown in FIG. 10, on the side surface of the shared bus 1,
The entrances and exits 2 and 3 are provided, and the lifting device 5 of the present invention is provided.
Is attached to the center entrance / exit 3, for example.

As shown in FIGS. 1 to 9, the lifting device 5 includes a fixed main body frame 10 fixed to a lower position of the entrance / exit 3 of the bus (the upper floor of the entrance / exit is indicated by 3A), and the entrance / exit 3 of the bus. Outer posts 11 as a pair of fixed posts vertically erected and fixed to the fixed body frame 10 so as to be located on both sides, and each hollow square pipe-shaped outer post 1.
1, an inner post 12 as a movable post slidably provided in the inner post 1, an outer connecting member 13 fixed to the lower end portions of the pair of inner posts and protruding to the outside of the outer post 11, and each outer connection. Member 13
The cross member 14 for connecting and integrating the bracket portions 13A integrated with each other, the support frame 15 fixed to the cross member 14, the first step plate 16A, and the connecting plate 16
B, a platform 17 in which the second step plate 16C is sequentially connected via a hinge, a parallel link mechanism 20 for deploying the platform 17 from a staircase-folded state to a flattened state, and the deployable parallel link mechanism 20. It has an extension plate 70 provided on the lower frame 38 below the link mechanism, and an end plate 50 also serving as a car stop that is provided at the tip of the lower frame 38 so that it can be raised and lowered and can be turned upside down.

The lifting hydraulic cylinder 21 for lifting and lowering the inner post 12 includes a hollow piston rod 2.
By using the inside of 4 as an oil supply passage, oil can be supplied into the cylinder from the oil supply port 26 on the upper end side surface of the outer post 11, and a single-acting hydraulic cylinder that operates in the piston rod contraction direction is configured. ing. The lifting cylinder 21 is disposed inside the hollow square pipe-shaped inner post 12, the upper end of the piston rod 24 is pivotally supported by the pin 27 on the upper end of the outer post 11, and the cylinder body 22 is pinned. Inner post 1 at 28
It is pivotally attached to the lower end of 2.

As shown in FIGS. 2 and 3, one side surface of the outer post 11 (the surface facing the front end side of the platform)
A vertical slit groove 30 is formed in the inner post 12, and the external connecting members 13 fixed to the lower ends of the inner posts 12 project to the outside of the outer post 11 through the slit groove 30.

Between the lower ends of the pair of inner posts 11,
That is, the bracket portion 13A integrated with the external connecting member 13
The cross member 14 and the support frame 1 secured by welding between them
A first step plate 16A is fixed to the upper part of the vehicle 5, and a rear end of a connecting plate 16B is pivotally attached to the first step plate 16A via a hinge. Further, one end of the compression arm 34 and the tension arm 36, which form a pair of links of the parallel link mechanism 20 for deployment with respect to the bracket portion 13A, have the pin 3 at one end.
It is pivotally attached at 1A and 32A.

The parallel link mechanism 20 for deployment includes a compression arm 34, a tension arm 36, and a lower frame 38, and the other ends of the compression arm 34 and the tension arm 36 are pins 31B and 32B, respectively. Is pivotally attached to. Then, the second tread 1 of the platform 17
6C is mounted on the lower frame 38. Here, the lower frame 3 with respect to the second step plate 16C.
8 is movable in the lateral direction by a predetermined amount. That is, as shown in FIGS. 4 and 5, a plurality of rollers 43 are pivotally attached to the roller mounting plate 42 fixed to the lower surface of the second step plate 16C, and the rollers 43 are formed inside the side surface of the lower frame 38. It is adapted to engage with the groove 44. The main body side of the expanding hydraulic cylinder 41 is pivotally attached to the side surface portion of the lower frame 38 via a pin 39A, and the piston rod tip end portion of the cylinder 41 is pivotally attached to the external connecting member 13 side by a pin 39B. The expansion assisting spring 45 is arranged between the first step plate 16A and the connecting plate 16B.

In such a parallel link mechanism 20 for expansion, the compression arm 34 and the tension arm 36 are in a suspended state when the hydraulic cylinder 41 for expansion is contracted, and the compression arm 34 and the tension arm 36 are rotated during expansion. The lower frame 38 is at the upper limit position. Therefore, the contraction of the hydraulic cylinder 41 for deployment,
With the extension, the lower frame 38 descends or rises while maintaining the horizontal state, and at the lower limit position of the lower frame 38, the platform 17 is bent in a stepwise manner as shown in FIG. 1, and the lower frame 38 rises. At the limit position, the platform 17 is in the state U of FIG. Here, the compression arm 3
Since the turning radii of 4 and the tension arm 36 are set to be larger than the turning radius of the connecting plate 16B when the platform 17 is changed from the stepwise bent state to the expanded state, the expanded state of the platform 17, that is, At the upper limit position of the lower frame 38, the lower frame 38 is in a state of protruding toward the tip side of the platform 17.

As shown in FIGS. 6 to 8, a tip plate 50 also serving as a car stop is connected to the tip portion of the lower frame 38 via a double hinge mechanism formed by connecting two hinges. Axis 5 of the two hinges of the double hinge mechanism
One shaft 53A of the 3A and 53B is fixed to the lower frame side, and the other shaft 53B is rotatable about the shaft 53A. Both shafts 53A, 5
Inverted V-shaped side plates 54 are fitted and fixed on both sides of 3B. As a result, the inverted U-shaped side plate 54 can rotate about the shaft 53A as a rotation fulcrum, and the tip plate 19 also serving as a car stop can rotate the shaft 5A.
3B is a fulcrum of rotation, and can be raised and lowered and can be rotated until it is turned over.

Further, the extension plate 7 is utilized by utilizing the shaft 53A.
0 is pivotally attached to the tip side of the lower frame 38.
The extension plate 70 is urged by a torsion spring (not shown) in a direction in which the rear end portion is lowered. As shown in FIG. 6, when the platform 17 has a stepped shape, it is stored below the second step plate 16C. In this state, as shown in FIGS. 7 and 8, when the platform 17 is deployed in a flat plate shape, the lower frame 38 with respect to the second step plate 16C is
It is located on the tip side of the platform 17 in accordance with the forward movement of the. Here, a roller attachment plate 71 is fixed to the lower side of the second step plate 16C, and a plate push-up roller 72 that pushes up the extension plate 70 is pivotally attached to the roller attachment plate 71. Therefore, when the lower frame 38 of FIG. 7 and FIG.
By riding on No. 2, the height is increased by a predetermined amount as compared with the time of storage of FIG.

As shown in FIGS. 6 to 8, a car stop rotating mechanism 51 for undulating the car stop and tip plate 50 and rotating it to an upside down state includes a double hinge mechanism and an inverted dogleg side plate 54. , One end of which is engaged with a horizontally elongated slot 81 of a perforated plate 80 fixed to both sides of the second step plate 16C by a pin 82A, and the other end of which is connected to an end of an inverted U-shaped side plate 54 by a pin 82B. And a double-acting hydraulic cylinder 62 for undulation, an undulation for connecting the tip end portion of the piston rod of the cylinder 62 and a small arm 55 for undulation fixed to an intermediate portion of the shaft 53B of the double hinge mechanism. Link 6
5 and. A cylinder mounting bracket 60 is fixed inside the lower frame 38 as shown in FIG.
The undulating double-acting hydraulic cylinder 62 is pivotally attached to the cylinder mounting bracket 60 by a pin 61. Also,
A small arm 63 is pivotally attached to the bracket 60 with a pin 64,
With respect to the tip of the small arm 63, the tip of the piston rod of the undulating double-acting hydraulic cylinder 62 and the undulating link 6
One end of 5 is pivotally attached by a pin 66. As a result, in the vehicle stop and tip plate 50, when the undulating double-acting hydraulic cylinder 62 is in a contracted state and the platform 18 is bent in a stepwise manner as shown in FIGS. The pin 82A at the engaging end is located at the right end of the elongated hole 81 as shown in FIG. 6, and the tip plate 50 is forcibly turned over and overlaps the second step plate 16C. Then, when the platform 17 expands into a flat plate shape, the lower frame 38 advances with respect to the second step plate 16C, the rotation link 83 engages with the left end of the elongated hole 81, and the platform 17 becomes a flat plate. 7, the inverted U-shaped side plate 54 is pulled by the rotation link 83 and the shaft 53A is pulled.
It can be rotated about 90 degrees using as a fulcrum. In the operation shown in FIGS. 6 to 7, the double-acting hydraulic cylinder 62 is driven, and further, from the state shown in FIG. As a result, as shown in FIG. 8, the tip can be lowered (fallen down). Further, by contracting the hydraulic cylinder 62 from the state shown in FIG.
Can be set up as a car stop.

It should be noted that the extension plate 70 is divided into two parts on the left and right sides in a relation that the hoisting link 65 of the car stop turning mechanism 51 for hoisting the car stop tip plate 50 is arranged at the center of the tip of the platform 17. There is.

The bottom surface of the entrance / exit 3 on the vehicle side is completely cut out so that the lower frame 38 of the lifting device 5 can be landed. Dust and splashes of rainwater may enter through the gaps. For this reason, the seal plate 86 to which an elastic seal material such as sponge is attached is attached to the front surface and the left and right side surfaces of the fixed main body frame 10 via the hinges 87. The seal plate 86 is biased by a spring (not shown) in a direction to shield the bottom surface of the entrance / exit 3. Therefore, when the inner post 12 is stored in the outer post at the upper limit position as when the vehicle is traveling, the gap between the platform 17 and the main body frame 10 which has a stepped shape as shown in FIG. 1 is closed. Further, when the inner post 12 is lowered, the seal plate 86 is automatically opened as shown by the phantom line in FIG. 9, so that the lowering of the inner post 12 and the like is not hindered.

As shown in FIG. 2, a lock mechanism 90 is attached to the lower frame 38 in order to keep the platform 17 locked in a staircase state. That is, the lock mechanism 90 includes a lock lever 92 that is pivotally attached to the lower frame 38 and has a hook 91 at its tip, and a lock hydraulic cylinder 93 pivotally attached to the lower frame 38 by a pin 95. .. The piston rod 94 of the hydraulic cylinder 93 is connected to the rear end of the lock lever 92. Therefore, when the hydraulic cylinder 93 extends, the hook 91 engages with the lock pin 96 fixed to the main body frame 10, and the lower frame 38 is locked to the main body frame 10. On the contrary, when the hydraulic cylinder 93 contracts, the engagement of the hook 91 is released, and the lower frame 38 can move according to the parallel link mechanism 20 for deployment.

In the configuration of the above embodiment, the lifting device 5
Is in the state J of FIGS. 1 and 9, the lifting hydraulic cylinder 21
The inner post 12 is in the upper limit position in the most contracted state, and the first post fixed on the cross member 14
The upper surface of the tread board 16A substantially coincides with the upper floor surface 3A of the entrance / exit 3. Further, the platform 17 is bent in a stepwise manner while the expanding hydraulic cylinder 41 is in a contracted state, and the lower surface of the second step plate 16C is supported by the lower frame 38. Further, the extension plate 70 is pulled under the second footboard 16C together with the lower frame 38, and the car stop / tip plate 50 overlaps the second footboard 16C in an upside-down state and functions as a footboard. In this state, the first and second treads 1 of the platform 17 are
Normal passengers can get on and off by using 6A, 16C and the front end plate 50 that also serves as a car stop.

When moving up and down a wheelchair or the like, first, the lock hydraulic cylinder 93 is contracted to lower the lower frame 3.
8 is made free, and the platform 17 is driven from the bent state in the stepwise state to the flattened state like the state U in FIG. That is, the hydraulic cylinder 41 for expansion is extended, and the lower frame 38 is raised by the parallel link mechanism 20 for expansion. At this time, the compression arm 34 and the tension arm 36 rotate clockwise,
At the upper limit position of the lower frame 38, the platform 17 on the lower frame deploys like a flat plate. At this time, since the turning radii of the compression arm 34 and the tension arm 36 are set to be larger than the turning radius of the connecting plate 16B, the lower frame 3
8 is in a state of being pushed out to the tip side of the platform 17. The extension plate 70 is located on the tip side of the platform 17 to form a platform structure having a depth dimension (for example, 1100 mm or more) sufficient to mount a wheelchair or the like as a whole. At this time, as shown in FIGS. 7 and 8, the extension plate 70 rides on the plate push-up roller 72, and the extension plate 70 is lifted by a predetermined amount, and the step with the tip of the platform 17 is reduced. Simultaneously with the unfolding of the platform 17, the car stop and tip plate 50 is erected by the function of the car stop turning mechanism 51 as shown in FIG. The expanded platform 17 can be lowered to the landing position of the lower frame 38 in the state L of FIG. 9 by the extension operation of the lifting hydraulic cylinder 21.

In order to place a wheelchair or the like on the platform 17 and the extension plate 70 landing on the surface of the ground, the tip plate 50 also serving as a car stop needs to be in a down state. Therefore, as shown in FIG. The cylinder 62 is extended to lower the tip of the vehicle stop and tip plate 50 (phantom line K in FIG. 9). In this state, the wheelchair or the like can be moved onto the extension plate 70 and the platform 17.

As shown in FIG. 7, when the platform 17 is lifted with a wheelchair or the like placed, the double-acting hydraulic cylinder 6 for undulation is used.
2 is contracted to erect the car stop and tip plate 50 (phantom line M in FIG. 9), and the lifting hydraulic cylinder 21 is contracted while maintaining the deployed state of the platform 17 and the car stop and tip plate 50 in an upright state. By As a result, the inner post 12 rises to the upper limit position in the outer post 11, the platform 17 and the vehicle-side entrance / exit upper floor surface 3A are at the same height, and the wheelchair or the like is moved from the platform 17 to the upper floor surface 3A. Can be moved.

On the contrary, a wheelchair or the like can be transferred to the ground by placing a wheelchair or the like on the platform 17 and the extension plate 70 at the upper limit position from the vehicle side and lowering the platform 17. When the platform 17 descends, the tip plate 50 that also serves as a car stop stands up to prevent the wheelchair or the like from falling. After the landing of the platform 17, the tip of the wheel stop and tip plate 50 can be lowered to move the wheelchair or the like to the ground side.

After the lifting of the wheelchair or the like is completed, the inner post 11 is returned to the upper limit position and the deploying hydraulic cylinder 41 is contracted, so that the platform 17 is re-staired as in the state J of FIGS. 1 and 9. And the extension plate 70
Is stored.

The structure of the above embodiment has the following features. (1) Platform 17 is used for normal passengers getting on and off.
Steps 16A, 16 for wheelchairs, etc.
C and the connecting plate 16B are formed in a flat plate shape, and the platform 17 is moved up and down with the extension frame 70 protruding toward the tip side of the second step plate 16C together with the lower frame 38. Therefore, it can be attached to a normal entrance / exit of a low-floor bus or the like, and the projection of the extension plate 70 can sufficiently increase the depth of the platform for mounting a wheelchair or the like. The platform can be lifted up and down by driving the inner post 12 which is slidable inside the outer post 11 in the up-down direction (vertical direction) by the lifting hydraulic cylinder 21. It is possible to get in and out of a wheelchair etc. in a narrow space without the movement of. (2) The turning radius of the compression arm 34 and the tension arm 36 of the deploying parallel link mechanism 20 is set to be larger than the turning radius of the connecting plate 16B when the platform 17 is changed from the stepped bent state to the deployed state. Therefore, the lower frame 38 and the extension plate 70 can be pushed out to the tip side of the platform 17 in conjunction with the unfolding operation of the platform 17. Therefore, a special drive mechanism for moving the extension plate 70 in and out is unnecessary (because the parallel link mechanism 20 for deployment can be used), and since there is no slide object in the lower frame 38, the structure is simple and lightweight and solid. is there. (3) The extension plate 70, which is pushed out when the platform 17 is deployed, is lifted up by a predetermined amount by the plate push-up roller 72, and the step with the tip of the platform 17 is reduced, so that the wheelchair can be smoothly moved. (4) The front end plate 50 also serving as a car stop on the front end side of the platform 17 is the second foot plate 16 of the platform 17.
Since it is used as a footboard by lining it upside down on C,
The length of the car stop and tip plate 50 can be made large enough,
It is possible to reduce the inclination of the upper surface of the vehicle stop and tip plate 50 when the platform 17 is in the lowered position and the tip of the vehicle stop and tip plate 50 is lowered to be in a landing state. Therefore, transfer to a platform such as a wheelchair can be carried out smoothly. (5) When the inner post 12 is stored in the outer post 11 such as when the vehicle is traveling, the bottom opening of the entrance 3 is shielded by the seal plate 86 to which an elastic sealing material such as sponge is attached. Therefore, it is possible to prevent dust and rainwater from entering.

[0031]

As described above, according to the present invention,
When the passengers get on and off, the platform should be in a staircase shape, and in the case of getting on and off (loading) of a wheelchair, etc., the platform should be in a flat state and the extension plate should be projected to the tip side of the platform together with the lower frame. Since it can be used as a platform structure (elevation plate) having a depth dimension, it is possible to obtain a small elevating device that can be suitably mounted in an entrance / exit of a low-floor passenger vehicle. Further, since the platform performs the vertical ascending / descending operation, it is possible to get on and off the wheelchair and the like even if the empty space around the platform is small. Furthermore, the structure is such that the unfolding operation of the platform and the protruding of the lower frame and the extension plate are mechanically interlocked, and the mechanism can be simplified.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of a lifting device according to the present invention when a platform has a step shape.

FIG. 2 is a partial plan view of a part of which is also a cross section.

FIG. 3 is a front view of the same portion.

FIG. 4 is a second example of the lower frame in the embodiment.
FIG. 3 is an enlarged side view of a main portion showing the stepped plate mounting structure.

FIG. 5 is a front sectional view of the same.

FIG. 6 is an enlarged cross-sectional side view of essential parts showing a state in which the front end plate also serving as a car stop and a mechanism portion for driving the front end plate also serving as a car stop are turned over and overlapped with the second tread plate in the embodiment.

FIG. 7 is an enlarged cross-sectional side view of essential parts showing a state in which the front end plate also serving as a car stop and the mechanism portion for driving the front end plate also serving as a car stop are erected in the embodiment.

FIG. 8 is an enlarged side sectional view of an essential part showing a state in which the tip plate also serving as a car stop and a mechanism portion for driving the tip plate also serving as a car stop are turned down in the embodiment.

FIG. 9 is a side sectional view for explaining the operation of the embodiment.

FIG. 10 is a side view showing a shared bus as an example of a passenger vehicle equipped with a lifting device.

[Explanation of symbols]

 1 Bus 2, 3 Entrance / Exit 10 Fixed Main Frame 11 Outer Post 12 Inner Post 13 External Connection Member 14 Cross Member 17 Platform 20 Parallel Link Mechanism for Deployment 21 Hydraulic Cylinder for Lifting 34 Compression Arm 36 Tension Arm 38 Lower Frame 41 Hydraulic for Deployment Cylinder 50 Tip plate that also serves as a car stop 51 Car stop rotation mechanism 62 Double-acting hydraulic cylinder for ups and downs 70 Extension plate 72 Plate push-up roller 86 Seal plate

Claims (4)

[Claims] 1. A fixed main body frame fixed to an entrance / exit side of a vehicle, a pair of fixed posts vertically erected and fixed to the fixed main body frame, and a pair of fixed posts provided to be movable up and down respectively. A movable post, a lifting cylinder that drives the movable post up and down, a cross member that connects between the pair of lower ends of the movable posts, a first step plate fixed to the cross member, and the first foot plate. A platform having a connecting plate whose one end is pivotally attached to the tip of the tread plate and a second tread plate which is pivotally attached to the other end of the connecting plate; and one end of which is pivotally supported on the movable post side, A compression arm and a tension arm that form a parallel link with a turning radius longer than the turning radius, and are pivotally attached to the other ends of the compression arm and the tension arm, respectively. A lower frame, and by providing the second step plate on the lower frame, the first and second step plates of the platform and the connecting plate are stepwise bent from a bent state to a flattened expanded state. In addition, a deployment link mechanism that pushes out the front portion of the lower frame to the platform tip side during deployment, a deployment cylinder that rotates the deployment link mechanism, and a deployment link mechanism that is disposed in the pushed out portion of the lower frame. An elevating device characterized by having an extended plate. 2. The elevating device according to claim 1, wherein a roller that raises the extension plate by a predetermined amount when the platform is deployed is provided on the second footboard side. 3. A vehicle stop and tip plate is movably connected to the tip of the lower frame.
Lifting device described. 4. A car stop rotation mechanism for rotating the car stop and tip plate from a state where the tip of the car stop and tip plate is lowered to a state where the car stop and tip plate is turned over and overlaps the second step plate. The lifting device according to claim 3.