JP2770006B2 - lift device - Google Patents

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 mounting and dismounting a wheelchair, a trolley or other cargo on a vehicle, and more particularly to a lifting device mounted on a rear portion of a van type car (box type vehicle). The present invention relates to an elevating device suitable for:

[0002]

2. Description of the Related Art As an elevating device of this type, a device disclosed in Japanese Utility Model Publication No. Sho 63-44272 proposed by the present applicant is conventionally known. This conventional device has a structure in which a platform is attached to a lower end portion of a side frame that is raised and lowered by a parallel link mechanism. By rotating the parallel link, the platform is moved to a landing position and a vehicle body floor surface of a van type car or the like. It can be moved up and down between the substantially coincident ascending positions.

[0003]

When the above-mentioned conventional apparatus is used for getting on and off a wheelchair, the user of the wheelchair is required to make the platform at a height substantially coincident with the floor of the body of a van type car or the like. It is indispensable to move the wheelchair from the platform outside the vehicle to the floor of the vehicle or vice versa.Because there are some steps and gaps between the platform outside the vehicle and the floor of the vehicle, There was a possibility that it would hinder the movement of a wheelchair. In addition, since it is necessary to operate a wheelchair on a platform at a raised position outside the vehicle, the user may feel uneasy about a wheelchair user.

Further, the platform is stored upright so as to cover the rear opening of the body of a van-type car or the like. In the case of loading / unloading cargo that does not require the platform to be lifted and lowered, a lifting device is provided. There was also a problem that the existence hindered the unloading work.

[0005] A first object of the present invention is to solve the above problems,
In addition to raising and lowering the platform, it can be retracted into the body of a van type car etc., improving the operability of users such as wheelchairs and trolleys, realizing smooth use of wheelchairs and trolleys, and improving safety. An object of the present invention is to provide a lifting device that can be designed.

A second object of the present invention is to provide a lifting device which automates the operation of pulling the platform out of the vehicle body and retracting the platform into the vehicle body, thereby further improving the operability.

A third object of the present invention is to provide an elevating device which does not hinder loading and unloading of cargo or the like that does not use the platform when the platform is retracted or stored.

[0008] Other objects and novel features of the present invention will be clarified in embodiments described later.

[0009]

In order to achieve the above-mentioned object, a lifting apparatus according to the present invention comprises a main body frame fixed to a floor of a vehicle body and a substantially parallel link having one end pivotally connected to the main body frame. First and second arms, and the first and second arms
A stay arm pivotally attached to the other end of the arm, a platform holder attached to the lower end of the stay arm and supported substantially horizontally in the deployed state, and slidably forward and backward with respect to the deployed platform holder. A platform that is freely mounted, a cylinder that rotates the first or second arm to drive the platform up and down, a band or a chain body having both ends fixed to the platform, and a platform that is attached to the platform holder. is a drive motor and a drive wheel of the band-shaped or chain-like member is rotated by the drive motor has been wound, the Pratt
A front brace plate connected to the front edge of the platform so as to be able to undulate,
A rear side connected to the rear edge of the platform so as to be undulating;
At the stop position of the platform and the platform
A stopper mechanism for keeping the front wheel stopper plate in an upright state;
The platform is in the drawer limit position and the front stop
Detection means for detecting that the plate is in the upright state.
For example, the drive motor causes sliding the platform through the belt or chain body driven to rotate the drive wheel
At the drawer limit position of the platform.
The detection means detects that the front brace plate is in an upright state.
The platform can be raised and lowered only when it is detected at the step
It is a configuration to make.

[0010]

[0011]

The platform holder and the platform at the retraction limit position are pivoted such that a pivot for pivotally attaching the platform holder to the stay arm side is tilted with respect to the floor surface of the vehicle body and is supported high toward the rear. The platform may be configured so that an end of the platform opposite to the pivot is located inside the vehicle body in a state where the platform stands upright about the rotation axis.

[0013]

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.

FIG. 1 is a side view showing an entire configuration of an embodiment according to the present invention, in which a platform is pulled out, and FIG. 2 is a side view showing a movement of the platform from a lowered state to a raised state (pulled out state). , FIG. 3 is a plan view of the platform ascending, FIG. 4 is a front view of the same, FIG. 5 is a side view of the retracted state of the platform, FIG. 6 is a plan view of the same, and FIG. is there.

In these figures, reference numeral 1 denotes a van-type vehicle (box-type vehicle), and a main body frame 2 is erected and fixed on a rear floor 1a near a rear opening of the body of the van-type vehicle.
In the main body frame 2, a position near one end of a main arm 3 constituting a substantially parallel link is pivotally connected to a pin 3 a, and one end of a sub arm 4 is pivotally connected to the pin 4 a. A stay arm 5 is pivotally connected to the other ends of the main arm 3 and the sub arm 4 by pins 3b and 4b. The lower part of the stay arm 5 is branched into two branches. As shown in FIGS. 3 and 4, the holder mounting bracket 6 is fixed to the lower end of the branch part 5a, and the platform holder 10 is fixed to the lower end of the holder mounting bracket 6 and the branch part 5b.
Vertical side plate 14 is pivotally connected by pins 19.

As shown in FIG. 1, one end of a double-acting hydraulic cylinder 20 for driving up and down is pivotally connected to the main body frame 2 by a pin 21. The piston rod of the double-acting hydraulic cylinder 20 is The arm 3 is pivotally attached to one end. Therefore, when the double-acting hydraulic cylinder 20 is extended, the platform holder 10 is in the raised position,
When is retracted, the platform holder 10 is at the lowered position. A power unit (not shown) for supplying hydraulic oil to the lifting / lowering double-acting hydraulic cylinder 20 through a hydraulic circuit is attached to the main body frame 2. Further, the platform holder 10 and the platform 30
The lifting and lowering operations can be performed by a push button switch 26 provided on the stay arm 5 side.

A platform 30 is slidably mounted on the platform holder 10 in the front-rear direction. That is, as shown in FIGS. 8 to 10, a vertical load roller (a roller that rotates in a vertical plane) that controls the vertical position of the platform 30 and receives a vertical load applied to the platform 30 is provided on the platform holder 10. ) 11, 12 and a roller 13 for preventing lateral deflection of the platform 30 (roller rotating in a horizontal plane) are pivotally mounted. On the bottom side of the platform 30, a vertical load roller 1 is provided.
The guide rails 31 and 32 having a horizontal cross section in which the sliding surfaces 1 and 12 slide inside, and the guide rail 33 having a substantially U-shaped cross section in which the roller 13 for preventing the lateral vibrations slide inside are fixed to each other. I have. A traveling roller 35 is pivotally mounted on the bottom surface of the platform 30 via a bracket 34. The traveling roller 35 travels smoothly when the platform 30 is retracted on the rail 37 mounted and fixed on the floor 1a in the passenger compartment of the van type vehicle 1,
This enables the storing operation to be performed.

As shown in FIGS. 9 and 10, the front and rear edges of the platform 30 have front and rear baffle plates 40 and 5 respectively.
0 are connected to each other by hinges 41 and 51 so as to be able to move up and down.

The front brace plate 40 is adapted to be manually raised and lowered, and a lock pin 43 is fixed to one side thereof via a mounting plate 42. Platform 3
A lock lever mounting bracket 44 is provided at a front end of the guide rail 32 having a substantially U-shaped cross section fixed to one side in the front-rear direction.
Is fixed, and a lock lever 46 is pivotally connected to the pin 45 by a pin 45. The lock lever 46 is biased by a spring in a direction in which a hook portion at the tip engages the lock pin 43. In a state where the lock pin 43 and the lock lever 46 are disengaged from each other, the front wheel stopper plate 40 is in a protruding state with its tip lowered by its own weight, but the front wheel stopper plate 40 is manually raised to about 45 degrees. By engaging the hook portion of the lock lever 46 with the lock pin 43, the front brace plate 40 can be held (locked) in an upright state.

The rear-side stop plate 50 is also used for manually raising and lowering, so that it can be kept upright. Further, when the platform 30 is unlocked, it can rotate freely, and when the platform 30 is stored, the virtual line F in FIG.
As shown in FIG. A permanent magnet 52 is fixed to the platform 30 so that the rear wheel stopper plate 50 can be held in close contact with the back side of the platform 30.

Note that, as shown in FIGS. 3 and 6, the position of the platform 30 at which the platform 30 can be pulled out is limited.
The platform 3 is defined by a stopper 36 provided at the end of a substantially U-shaped guide rail 33 fixed to the back side of the platform 3.
The retraction limit position of 0 is defined by another stopper means (not shown) so that the platform 30 and the front and rear baffle plates 40 and 50 are completely retracted into the passenger compartment of the van type vehicle 1 and do not come off the platform holder 10. I have.

As shown in FIGS. 8 to 10, an automatic platform slide mechanism 60 is provided for sliding the platform 30 between the retractable position and the retractable position with respect to the platform holder 10. . The platform automatic slide mechanism 60 includes a toothed belt 61 having both ends G and H fixed to the lower surface of a substantially U-shaped cross-section guide rail 32 provided in the front-rear direction of the platform 30, and a speed reduction mechanism installed on the platform holder 10. Motor (electric motor) 62, a belt wheel (drive wheel; pulley) 63 fixed to a rotation drive shaft of the motor 62 with a speed reducer, and a support plate 64 on the platform holder side
And a pair of guide rollers (driven wheels) 65 pivotally attached to the vehicle. The belt wheel 63 has irregularities on its outer peripheral surface that mesh with teeth on the toothed belt 61 side. The toothed belt 61 is guided by guide rollers 65 and is wound around the belt wheel 63. Here, the toothed belt 61 functions as a belt-like or chain-like body that drives the platform 30 by changing the rotational driving force of the motor 62 into a pulling force.

9 and 10, when the belt wheel 63 is rotated counterclockwise by the motor 62 with a speed reducer, the toothed belt 61 is sent rightward, and as a result, the platform 30 moves in the pulling-out direction from the passenger compartment. , The drawing limit position in FIG. Conversely, if the belt wheel 63 is rotated clockwise, the toothed belt 61 is sent to the left, and as a result, the platform 30 moves in the direction of being pulled into the vehicle interior, and reaches the retractable limit position in FIG.

If the platform 30 is not at the draw-out limit position with respect to the platform holder 10 when the platform 30 is moved up and down, there is a danger that the front wheel stopper plate 40 will interfere with (catch with) the vehicle bumper. In order to detect that the platform 30 is at the drawing-out limit position and the front-side stop plate 40 is in the upright state, as shown in FIG. The proximity switch 70 for preventing sliding at the time of lifting / lowering is fixed to the stay arm 5 (branch portion 5b) side by a mounting plate 71. The proximity switch 70 for preventing sliding at the time of elevating and lowering moves when the rear end portion (a magnetic metal plate such as an iron plate) of the lock lever 46 that locks the front vehicle stop plate 40 in an upright state is closely opposed (when the platform is in the drawing limit position). (In the state shown in FIG. 9 in which the front-side stop plate is in the upright state) and the hydraulic circuit is controlled so that the double-acting hydraulic cylinder 20 for elevation drive can be operated. When the platform 30 is not in the drawer limit position or when the front brace plate 40 is not in the upright state, the rear end of the lock lever 46 is moved by the proximity switch 7 for preventing sliding during elevating.
Since the switch 70 is not close to 0 and the switch 70 is off, the vertical drive double-acting hydraulic cylinder 20 cannot be operated. This prevents a device failure or danger from occurring due to an erroneous operation.

Further, in order to ensure safety, it is necessary that the front vehicle stopper plate 40 is maintained (locked) in an upright state when the platform 30 is moved up and down. Therefore, as shown in FIG. A stopper 80 is provided to keep the front brace plate 40 in the upright position at the limit position. The stopper 80 has an inverted L shape and is fixed to one vertical side plate 14 of the platform holder 10. The lock lever 46 in the locked state engaged with the lock pin 43 prevents the rear end of the lock lever 46 from lowering and being unlocked.

The platform holder 10 and the platform 30 can be manually operated from the horizontal state J of the imaginary line in FIG. 7 to the vertically stored state K of the solid line in FIG. 7 when the platform 30 is at the retraction limit position. In order to lock in this stored state, a platform side upright lock mechanism 90 is provided as shown in FIG. 4, FIG. 7, and FIG. That is, an eyebolt 91 as a locking member is fixed to the upper end surface of the stay arm 5, and a lock fitting 100 having a hole 101 fitted into the eyebolt 91 as shown in FIG.
Is connected to the side end of When the platform holder 10 and the platform 30 are stored in the upright position, the lock fitting 100 is inverted as shown by the solid line in FIG. 7 and the hole 101 of the lock fitting 100 is fitted into the eyebolt 91 as shown in FIG. And platform 3
Lock so that 0 does not expand horizontally.

As shown in FIG. 5 and the like, a pin 19 as a pivot for pivotally attaching the platform holder 10 to the stay arm 5 is supported so that it is inclined with respect to the floor of the vehicle body and becomes higher rearward. Have been. This is because, when the platform holder 10 and the platform 30 at the retraction limit position are set upright (the imaginary line L in FIG. 5) with the pin 19 as the rotation center, the platform 30 is located on the opposite side of the pin 19 from the pin 19. This is because the end is located closer to the inside of the cabin of the van-type vehicle 1. As a result, as shown by the phantom line in FIG. 5, the platform 30 can be stored even when the rear surface of the van-type vehicle 1 is curved and the upper side of the rear part of the cabin is narrow.

Next, the overall operation of the embodiment according to the present invention will be described.

First, a side view of the rear of the passenger compartment of the van type car 1 is shown in FIG.
When the platform holder 10 and the platform 30 are stored in an upright state as in the above, the lock fitting 100 of the side upright lock mechanism 90 of the platform is removed from the eyebolt 91 in order to enable the use of the elevating device.
The platform holder 10 and the platform 30 are deployed horizontally by manual operation. Then, the wheelchair or the like in the vehicle compartment can be transferred onto the platform 30 by temporarily setting the front side stopper plate 40 to the downside. At this time, the rear side stop plate 50 is locked in an upright state,
Prevent wheelchairs from falling.

Then, before the pull-out operation of the platform 30, the front wheel stopper plate 40 is set up. That is, as shown in FIG. 10, the lock lever 46 of the platform 30 is engaged with the lock pin 43 of the front brace plate 40 and locked. Thereafter, power is supplied to a motor 62 with a speed reducer of the platform automatic slide mechanism 60, and the belt wheel 63 is driven to rotate.
The platform 30 at the retraction limit position in FIGS. 6 and 10 is pulled out to the pullout limit position in FIGS. 1, 3, 4, and 9. Since the front-side stop plate 40 is in the upright state before the platform 30 is pulled out, the lock lever 46 is prevented from moving in the unlocking direction by the inverted L-shaped stopper 80 as shown in FIG. By setting this state, the rear end of the lock lever 46 approaches the proximity switch 70 for preventing sliding at the time of lifting and lowering, and the proximity switch 70 for preventing sliding at the time of lifting and lowering is turned on. It is ready for operation.

As shown by the phantom line Q in FIGS. 1 and 2, the double-acting hydraulic cylinder 20 for raising and lowering the drive is actuated (compressed) from the drawing limit position of the platform 30, and the main arm 3 and the sub-arm 4 are rotated. 30 is lowered from the rear edge position of the vehicle body floor surface to the landing state indicated by the solid line R in FIG. At this time, the front wheel stopper plate 40 is locked in the upright state by the stopper 80, and the rear wheel stopper plate 50 is also kept (locked) in the upright state. Therefore, the wheelchair CH shown by a virtual line in FIGS. Etc. can be reliably prevented.

As shown by the solid line R in FIG.
When 0 is completely landed, the wheelchair CH and the like can be moved to the ground by operating the rear wheel stop plate 50 so as to be in a prone state as shown by a virtual line S in FIG. The main arm 3 and the sub arm 4 only need to constitute substantially parallel links (including those in which the lengths of both arms are slightly shifted). As can be seen from the solid line R in FIG. It is preferable that the rear end side (the end side where the rear wheel stopper plate 50 is connected) be slightly lowered. This is for facilitating getting on and off the platform 30 such as the wheelchair CH and not forgetting the manual operation for erecting the rear wheel stopper plate 50.

When a wheelchair or the like on the ground is to be loaded in the van-type vehicle 1, the wheelchair CH is placed on the platform 30 in the landing state via the rear side stop plate 50 in a prone state as shown by a solid line R in FIG. And the like, and after raising the rear-side stopping plate 50, the double-acting hydraulic cylinder 20 for raising and lowering drive is operated (extended) to raise the platform 30 to the upper limit position (the platform holder indicated by the phantom line Q in FIG. 2). 10 is floor 1a
Move to the upper position. ).

Next, FIG. 1, FIG. 2 virtual line Q, FIG. 3, FIG.
Also, the platform 30 at the drawer limit position as shown in FIG. 9 is energized to the motor 62 with a speed reducer of the platform automatic slide mechanism 60 to be pulled into the draw limit position in FIGS. 5, 6, and 10. After the retraction is completed, the wheelchair CH
Is transferred to the floor 1a.

The front brace plate 40 is held upright by the stopper 80 shown in FIG. 9 when the platform 30 is in the withdrawn state, and the rear brace plate 50 is
Is locked in the upright state except when the platform 30 is landing, so that the fall of the wheelchair CH or the like can be reliably prevented.

According to this embodiment, the following effects can be obtained.

(1) The platform 30 can not only be raised and lowered but also retracted into the vehicle body, thereby improving the operability of a user such as a wheelchair or a trolley, realizing a smooth use of the wheelchair or a trolley, and ensuring safety. Improvement can be achieved. That is, there is no need to perform a wheelchair operation on the platform when the vehicle is at the ascending position outside the vehicle body, and the wheelchair user does not feel uneasy.

(2) The operation of retracting the platform 30 into and out of the vehicle body can be automated by the platform automatic slide mechanism 60, so that the operability can be further improved.

(3) When the platform 30 is in the retracted state, or the platform holder 10 and the platform 30 are further turned 90 degrees from the retracted state to the storage state of FIG. Loading and unloading of cargo and the like that does not use a platform can be performed smoothly, and the presence of a platform and the like does not hinder the loading and unloading of other cargo.

(4) The platform holder 10 has longitudinal load rollers 11 and 12 for regulating the vertical position of the platform 30 and a lateral deflection preventing roller 13 for regulating the horizontal position of the platform 30. As a result, the platform 30 can be smoothly pulled out and pulled in.

(5) A front wheel stop plate 40 and a rear wheel stop plate 50 are respectively connected to the front and rear edges of the platform 30 so as to be able to move up and down. Can be.

(6) As a detecting means for detecting that the platform 30 is in the limit position for pulling out and the front-side stop plate 40 is in the upright state, a proximity switch 70 for preventing sliding at the time of elevating is provided. Since the platform 30 can be moved up and down only when the front-side stop plate 40 is in the upright state, it is possible to prevent damage to the device due to an erroneous operation, a fall accident, and the like.

(7) As shown in FIG. 5 and the like, a pin 19 as a pivot for pivotally attaching the platform holder 10 to the stay arm 5 side is inclined with respect to the vehicle body floor surface so as to become higher rearward. When the platform holder 10 and the platform 30 at the retraction limit position are set upright with the pin 19 as the center of rotation (the imaginary line L in FIG. 5 and FIG. 7) because of being supported, the platform 30 It is possible to make the end opposite to the pin 19 closer to the inside of the vehicle body. Thereby, the platform of the virtual line L in FIG.
The platform 30 can be stored even when the rear surface of the van-type vehicle 1 is curved and the upper side of the rear part of the cabin is narrowed.

The mounting position of the cylinder 20 can be appropriately changed as long as at least one of the first and second arms forming a substantially parallel link can be rotated.

Further, a toothed belt 61 is used as a belt-shaped or chain-like body, and a belt wheel 63 is used as a driving wheel for driving the toothed belt 61, but a chain or the like is used as a belt-shaped or chain-like body. A configuration in which a sprocket or the like is used as a driving vehicle for driving a chain or the like may be adopted.

Although the embodiments of the present invention have been described above, it is obvious to those skilled in the art that the present invention is not limited to the embodiments and various modifications and changes can be made within the scope of the claims. There will be.

[0047]

As described above, according to the elevating device according to the present invention, it is possible not only to raise and lower the platform, but also to retract the platform into the body of a van-type car or the like.
The operability of the user of the trolley or the like can be improved, the smooth use of the wheelchair, the trolley, or the like can be realized, and safety can be improved. In particular, since it is not necessary to operate the wheelchair on the platform when the vehicle is at the ascending position outside the vehicle body, the user does not feel uneasy.

Further, the operability can be further improved by automating the operation of pulling the platform into and out of the vehicle body. In addition,
The platform is in the drawer limit position and the front brace plate stands upright.
Platform only when it is detected by the detection means
Since the platform can be moved up and down, the device due to erroneous operation
Damage and falling accidents can be prevented.
Also in this respect, safety can be improved.

Further, if the platform is retracted, or the platform holder and the platform are stored upright at the lateral position inside the vehicle body, the loading / unloading operation of the cargo or the like without using the platform can be performed smoothly. Does not hinder the loading and unloading of other cargo.

[Brief description of the drawings]

FIG. 1 is a side view of a general configuration of an embodiment of a lifting device according to the present invention, in which a platform is pulled out.

FIG. 2 is a side view showing a movement of the platform from a lowered state to a raised state (extended state) in the embodiment according to the present invention.

FIG. 3 is a plan view of the embodiment according to the present invention in a state where the platform is raised.

FIG. 4 is a front view of the same.

FIG. 5 is a side view of the embodiment according to the present invention in a state where the platform is retracted.

FIG. 6 is a plan view of the same.

FIG. 7 is a front view of a state where the platform holder and the platform are stored upright in the embodiment according to the present invention.

FIG. 8 is a front view of a platform holder used in the embodiment according to the present invention.

FIG. 9 is an enlarged side view of the platform holder and the platform used in the embodiment according to the present invention, when the platform is at a drawer limit position.

FIG. 10 is an enlarged side view of the platform holder and the platform used in the embodiment according to the present invention, when the platform holder is at the retraction limit position.

FIG. 11 is a partially enlarged plan view showing a side standing lock mechanism of the platform according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Van type vehicle 1a Body floor 2 Body frame 3 Main arm 4 Sub arm 5 Stay arm 6 Holder mounting bracket 10 Platform holder 11, 12 Vertical load roller 13 Lateral run-out prevention roller 20 Double-acting hydraulic cylinder for lifting drive 30 Platforms 31, 32, 33 Guide rails 34 Brackets 35 Traveling rollers 40 Front brace plate 41 Hinge 50 Rear brace plate 51 Hinge 60 Platform automatic slide mechanism 61 Toothed belt 62 Motor with reduction gear 63 Belt wheel 65 Guide roller 70 Up / down Proximity switch for slide prevention 80 Stopper 90 Side upright lock mechanism

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60P 1/44

Claims (2)

(57) [Claims] 1. A main body frame fixed to a floor of a vehicle body, first and second arms forming substantially parallel links having one end pivotally connected to the main body frame, and a first arm and a second arm. A stay arm pivotally attached to the other end, a platform holder attached to the lower end of the stay arm and supported substantially horizontally in a deployed state, and slidably attached to the deployed platform holder in the front-rear direction. A platform, a cylinder for rotating the first or second arm to drive the platform up and down, and a band-shaped or chain-shaped body having both ends fixed to the platform.
A drive motor mounted to the platform holder, a driving wheel in which the strip-shaped or strand-like body is rotated by the drive motor has been wound, of the platform
A front brace plate connected to the front edge so as to be able to undulate;
Rear brace plate connected to the rear edge of the platform
And the front side at the drawer limit position of the platform
A stopper mechanism that keeps the wheel stopper plate upright,
The platform is in the drawer limit position and the front brace plate is raised.
And detecting means for detecting that it is in stand state, the drive motor is intended for sliding said platform through said band or chain body driven to rotate the drive wheel
And the front vehicle is located at the position where the platform can be pulled out and the front vehicle
The detection means detects that the stopper plate is in the upright state.
An elevating device capable of elevating the platform only when the elevating operation is performed . 2. A pivot axis for pivotally mounting the platform holder on the stay arm side is supported at a high angle rearward inclining with respect to a floor surface of the vehicle body, and the platform holder and the platform at a retraction limit position are supported. 2. The lifting device according to claim 1, wherein an end of the platform opposite to the pivot is located inside the vehicle body in a state where the platform is set upright with the pivot as a rotation center.