JP2992290B1 - Sliding lifting device - Google Patents

Abstract

[PROBLEMS] To make it possible to use a drive source such as an electric motor other than a hydraulic cylinder, and to facilitate fine adjustment of a tilt of a platform with respect to a horizontal plane, thereby enabling smooth use of a wheelchair, a bogie, and the like. . A main arm (20) pivotally attached to a horizontally movable runner (4), a side frame (23) having a tip portion pivotally attached thereto, and a platform (40) and a runner (4) slidably attached to the main frame (20). It includes a chain 27 connected between the side frames 23 and an elevating assist arm 30 pivotally supported near the opening and closing opening of the vehicle body. By driving the runner 4 in the front-rear direction, the intermediate portion of the main arm 20 is moved. In this configuration, the main arm 20 is rotated by being supported by the elevation assist arm 30, and the platform 40 is raised and lowered in a substantially horizontal state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating device mounted on a vehicle for getting on and off a wheelchair, a trolley and the like.
More particularly, the present invention relates to a slide type elevating device suitable for being mounted on a rear portion of a van type vehicle (box type vehicle).

[0002]

2. Description of the Related Art Conventionally, as an elevating device of this type, there has been known an apparatus disclosed in Japanese Patent Application Laid-Open No. 9-183333 proposed by the present applicant. This conventional device has a structure in which a platform is slidably attached to a platform holder which is moved up and down by a parallel link mechanism in a front-rear direction. The platform can be raised and lowered between a raised position higher than the vehicle body floor surface and the platform can be drawn into the vehicle body at the raised position.

[0003]

Incidentally, the above-mentioned conventional apparatus requires a large operating force to rotate the parallel link, and is premised on using a hydraulic cylinder. Etc. were needed. Also,
Each arm constituting the parallel link also needs to be strong enough to withstand a large operating force, and this has led to an increase in the size and weight of the mechanism. Furthermore, although the parallel link is constituted by two arms on each side, the length between the pivot points of each arm is constant, and it is difficult to adjust the subtle inclination of the platform with respect to the horizontal plane after assembly. there were.

In view of the above, the present invention makes it possible to use a drive source such as an electric motor other than a hydraulic cylinder as a mechanism for raising and lowering a platform on which a wheelchair, a trolley and the like are mounted while sliding the platform. Facilitates delicate tilt adjustments for wheelchairs,
An object of the present invention is to provide a slide-type elevating device capable of smoothly using a bogie or the like.

[0005] Other objects and novel features of the present invention will be clarified in embodiments described later.

[0006]

In order to achieve the above object, the present invention provides a sliding type lifting device which is fixed to a vehicle body and has a front end extending to a vicinity of an opening / closing opening of the vehicle body; A runner supported movably in a horizontal direction by a rail, a main arm having a base end pivotally connected to the runner, a side frame having a tip end of the main arm pivotally connected, and a base end of the main arm A first arc-shaped member fixed to the runner concentrically with the pivot point of the second arm; a second arc-shaped member fixed to the side frame concentrically with the pivot point of the main arm tip; A chain-like, band-like or cord-like body fixed to the runner and stretched around the outer peripheral portions of the first and second arc-shaped members and the other end fixed to the side frame; Movably mounted A platform, and an elevating auxiliary arm pivotally supported at a position near the opening / closing opening of the vehicle body, wherein the length between the first and second arc-shaped members of the chain, band, or cord is defined by the following. The distance substantially coincides with the distance between the pivot points of the main arm, and by driving the runner in the front-rear direction of the guide rail, the intermediate portion of the main arm is supported by the lifting / lowering auxiliary arm, and the main arm is moved. The platform is turned up and down in a substantially horizontal state.

[0007] Further, in the slide type lifting device,
A configuration may be provided in which a screw shaft supported in parallel with the guide rail and driven to rotate by an electric motor, and a nut member screwed to the screw shaft and fixed to the runner are provided.

[0008] It is preferable that a roller abutting on an intermediate portion of the main arm is provided on the lifting assist arm.

[0009] It is preferable that a lifting assist cam that is in contact with a roller pivotally attached to an intermediate portion of the main arm is fixed to the lifting assist arm.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a slide type lifting device according to the present invention.

1 to 5, reference numeral 1 denotes a vehicle body of a van type car, 2 denotes a floor thereof, and a pair of horizontal guide rails 3 are fixed along the floor 2 on the floor. The pair of horizontal guide rails 3 are arranged in parallel so that the front ends reach the vicinity of the opening / closing opening of the vehicle body 1 and the rear ends are drawn in the depth direction of the vehicle body. The runner 4 has a plurality of rollers 5 sliding on the inside of the horizontal guide rail 3 pivotally mounted (rotatably attached), and is slidably supported between the front end and the rear end of the guide rail 3. The left and right runners 4 are shown in FIG.
As shown in FIG.

A ball screw shaft 10 is rotatably supported on the vehicle body floor 2 in parallel with each horizontal guide rail 3, and a nut member 11 screwed to the ball screw shaft 10 is fixed to the runner 4. Further, an electric motor 12 that rotationally drives the ball screw shaft 10 via a gear reduction mechanism is mounted on a mounting bracket 13.
To the floor 2 of the vehicle body.

The base end of the main arm 20 is pivotally connected to the runner 4 by a pin 21 at a pivot point P, and the distal end of the main arm 20 is pivotally connected to the side frame 23 by a pin 22 at a pivot point Q. ing. Rollers 2 necessary for rotating the main arm are provided in the middle portion of the main arm 20.
4 is pivoted.

A sprocket 25 as a first arc-shaped member is fixed to the runner 4 so as to be concentric with the pivot point P at the base end of the main arm 20. A sprocket 26 serving as a second arc-shaped member is fixed so as to be concentric with the pivot point Q of the sprocket. A chain 27 as a chain is stretched between the sprockets 25 and 26, one end of the chain 27 is fixed to the runner 4 side by a position-adjustable fixing tool 28, and the other end is fixed to the side frame 23. .

The position-adjusting fixture 28 is, for example, a chain 2
7 has a bolt 28a connected to one end thereof and a nut 28b screwed to the bolt 28a, and variably adjusts the protruding length of the bolt 28a with respect to the mounting portion 4a integrated with the runner 4 to finely adjust the fixing position of the chain 27. Can be adjusted. Normally, in order to provide the same function as the parallel link corresponding to the main arm 20, the radii of the sprockets 25 and 26 are made equal (or substantially equal), and the length of the chain 27 between the sprockets 25 and 26 is made main. The distance between the pivot points P and Q of the arm 20 is substantially equal. Thus, as will be described in detail later, when the main arm 20 rotates, the posture of the side frame 23 can be raised and lowered as a substantially constant posture without substantially changing.

The length of the chain 27 between the sprockets 25 and 26 is the length between the contact point R where the chain 27 starts to contact the sprocket 25 and the contact point S where the chain 27 starts to contact the sprocket 26.

A lifting assistance arm 30 is provided with a pin 31 near the front end of a horizontal guide rail 3 extending to the opening and closing opening of the vehicle body 1.
The arm 30 is pivotally attached to the vehicle body floor 2 side. A roller 32 is pivotally attached to the tip of the arm 30 so as to contact the lower part of the intermediate portion of the main arm 20, and the arm 30 faces the main arm 20. A plate cam 33 which is in contact with the main arm side roller 24 is fixed to the surface of the roller. 3 and 6A, the lift assist arm 30 is capable of standing upright and maintaining its standing state (the center of gravity is at a position capable of standing upright and the spring 34 for assisting standing up).
Is provided, it is also possible to keep the state in which the tip of the arm 30 is lowered and extended to the outside of the vehicle body opening / closing opening as shown by the solid line DN.

The left and right side frames 23 are connected and integrated by a connecting plate 36 to form a platform holder 35, and a platform 40 is mounted on the platform holder 35 so as to be slidable in the front-rear direction. The forward movement of the platform is a movement in a direction protruding from the vehicle body, and the backward movement is a movement in a direction of retracting into the vehicle body). That is, U-shaped cross-section rails 41 are integrated on both side surfaces of the platform 40, and a plurality of rollers pivotally supported inside the side frames 23 (that is, inside the side surfaces of the platform holder 35) in side recesses of the rails 41. The engagement of 37 allows the platform to move smoothly in the front-rear direction. As shown in FIG. 5, a small-diameter pinion 50 is located on the back side of the platform 40.
And the large-diameter pinion 51 is coaxially pivotally supported (rotatably supported) on the platform holder 35 side.
The fixed rack 52 meshes with the vehicle body floor side with respect to 0,
Rack 5 on the platform side for large diameter pinion 51
3 meshes. Therefore, if the runner 4 is advanced rightward and the platform holder 35 is similarly advanced in the platform retracted state of FIG.
The small-diameter pinion 50 meshing with the vehicle body floor side rack 52 is driven to rotate, and the large-diameter pinion 51 associated therewith also rotates to move the platform-side rack 53 forward, so that the platform 40 is driven forward to project from the vehicle body opening / closing opening. . At this time, the platform holder 35 with respect to the vehicle body is determined based on the diameter ratio between the small-diameter pinion 50 and the large-diameter pinion 51.
The platform 40 can be driven forward more than the above movement. Note that a roller 38 for supporting the lower surface of the platform 40 is mounted on the floor surface 2 in order to smoothly advance and retreat the platform 40 inside the vehicle body.

A front brace plate 45 is connected to the front edge of the platform 40 so as to be able to move up and down.
A rear-side stop plate 46 is connected to the rear edge so as to be able to move up and down. Each of them has a mechanism for locking in a standing state in order to prevent a wheelchair, a bogie or the like from falling down.

Next, the operation of this embodiment will be described with reference to FIGS. However, in FIGS. 6 to 8, the illustration of the platform 40 provided on the side frame 23 is omitted.

In the state shown in FIGS. 1 to 3 in which the platform 40 is housed in the vehicle body 1, the runner 4 and the nut member 11 integrated therewith as shown in FIG.
In this state, the lift assist arm 30 is also standing up (solid line UP state) and is drawn inward from the vehicle body opening / closing opening. When lowering the platform 40, first, the tip of the lifting assist arm 30 is lowered (solid line DN state) in FIG. 6A. Next, the ball screw shaft 10 is rotationally driven by the electric motor 12, and the runner 4 having the nut member 11 integrated therein is advanced (moved to the right in FIG. 6). In the forward movement of the runner 4 from FIG. 6A to FIG.
When the roller 24 at the intermediate position of 0 slides on the upper side of the horizontal guide rail 3, the base end pivot point P and the distal end pivot point Q of the main arm 20 are kept horizontal. In addition,
In the state shown in FIG. 6B, the platform 40 is driven so as to be at the most advanced position with respect to the side frame 23 (by rotating the pinions 50 and 51 of FIGS. 2 and 3 clockwise to the racks 52 and 53). To advance the platform 40).

When the runner 4 is further advanced, the roller 24 at the intermediate position of the main arm 20 moves onto the plate cam 33 of the lifting / lowering auxiliary arm 30 as shown in FIG.
As shown in FIG. 4B, the tip of the main arm 20 is gradually lowered, that is, the side frame 23 is gradually lowered.

The roller 2 is moved by the advance of the runner 4.
At the time when the plate cam 33 and the plate cam 33 are disengaged (or shortly before), the roller 32 at the distal end of the lifting assist arm 30 supports the lower side of the main arm 20 as shown in FIG. As the runner 4 advances, FIG.
As shown in (C), the tip of the main arm 20 descends while being supported (guided) by the roller 32.
Finally, the platform holder 35 in which the side frames 23 of FIG. 9 are integrated on both sides and the platform 40 held by the platform holder 35 are in a landed state.

In the state shown in FIG. 9, the front wheel stopper plate 45 is turned down, and a wheelchair, a trolley, etc. are placed on the platform 40,
Conversely, a wheelchair, a trolley or the like on the platform 40 can be lowered to the ground.

The operation of raising the platform 40 and the operation of retracting the platform 40 into the vehicle body may be the reverse of the operation of pulling out and lowering the platform 40 up to now. That is, the motor 12 drives the ball screw shaft 10 in the reverse direction to rotate the nut member 11.
Then, the runner 4 integrated with the main arm 20 is retracted, the lower side of the main arm 20 is guided by the rollers 32 of the lifting / lowering auxiliary arm 30 as shown in FIG. 8, and the leading end of the main arm 20 is lifted up. Then, as shown in FIG. Plate cam 3 of auxiliary arm 30
At 3, the roller 24 at the intermediate position of the main arm 20 is guided to return the pivot points P and Q before and after the main arm 20 to the horizontal position. Thereby, the platform 40 can be raised from the landing position to a position higher than the vehicle body floor surface 2 while maintaining the substantially horizontal state. Then, as shown in FIG. 6, the roller 24 slides on the guide rail 3 to pull the platform holder 35 to the storage position, and the platform 40 is retracted with respect to the side frame 23 as shown in FIGS. The platform 40 is stored in the vehicle body.

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

(1) When the ball screw shaft 10 is rotationally driven by the electric motor 12, the runner 4 integrated with the nut member 11 screwed thereto is horizontally moved, and the movement of the runner 4 is used to move the main arm. This is a mechanism that raises and lowers the platform 40 at the distal end while sliding the 20, and does not require a hydraulic cylinder, a solenoid valve, a hydraulic pipe, and the like, and can simplify the configuration.

(2) Sprockets 25 and 26 of the same diameter or substantially the same diameter are provided concentrically with the pivot points P and Q on the proximal and distal ends of the main arm 20, and a chain 27 is stretched between the sprockets 25 and 26. The main arm 20 has a function similar to that of a link substantially parallel to the main arm 20. In this case, it is easy to adjust the length of the chain 27, and the platform 4
Slight adjustment of the inclination with respect to the horizontal plane of 0 is facilitated, and smooth use of a wheelchair, a dolly, or the like becomes possible.

(3) Since the platform 40 is moved up and down by the set of the main arm 20 and the chain 27, it is possible to reduce the size and weight of the parallel link mechanism in comparison with the conventional parallel link mechanism.

In the above embodiment, the lifting assist arm 30 provided for raising and lowering the tip while sliding the main arm 20 is provided so as to abut on the lower side of the main arm 20 or to be fixed to the main arm 20. A structure in which a plurality of rollers are arranged so as to contact the plate cam may be adopted.

A pivot point P at the base end of the main arm 20
A sprocket 25 as a first arc-shaped member fixed to the runner 4 concentrically with the sprocket 26, and a sprocket 26 as a second arc-shaped member fixed to the side frame 23 concentrically with the pivot point Q at the tip of the main arm. The chain 2 is used as a chain member stretched between the two sprockets 25 and 26.
7 was used, but a pulley was used as each arc-shaped member, and a belt was used as a belt-shaped or cord-like body stretched between the two pulleys.
A wire rope or the like can also be used.

Further, the means for moving the platform with respect to the platform holder may be manual instead of electric.

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 that various modifications and changes can be made within the scope of the claims. There will be.

[0034]

As described above, according to the slide type lifting device of the present invention, a drive source such as an electric motor other than a hydraulic cylinder is used as a mechanism for raising and lowering while sliding a platform on which a wheelchair, a carriage and the like are mounted. , And delicate adjustment of the inclination of the platform with respect to the horizontal plane is facilitated, so that a smooth use of a wheelchair, a bogie or the like can be realized.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a slide-type elevating device according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a front view as seen from the vehicle body opening / closing side.

FIG. 6 is an operation explanatory view showing a process of moving the side frame from a retracted position to a position where the side frame can be moved up and down in the embodiment.

FIG. 7 is an operation explanatory view showing a process in which the main arm rotates while being guided by the plate cam of the lifting assist arm in the embodiment.

FIG. 8 is an operation explanatory view showing a process in which the main arm rotates while being guided by the roller at the tip of the lifting assist arm in the embodiment.

FIG. 9 is an operation explanatory diagram showing a side frame landing state in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Floor 3 Horizontal guide rail 4 Runner 5,24,32,37,38 Roller 10 Ball screw shaft 11 Nut member 12 Electric motor 20 Main arm 23 Side frame 25,26 Sprocket 27 Chain 30 Elevating auxiliary arm 35 Platform holder 40 platform 50 small diameter pinion 51 large diameter pinion 52,53 rack

Claims (4)

(57) [Claims] 1. A horizontal guide rail fixed to a vehicle body and having a front end near an opening and closing opening of the vehicle body, a runner supported movably in the horizontal direction by the guide rail, and a base end portion connected to the runner. A pivotally mounted main arm, a side frame to which a distal end of the main arm is pivotally mounted, a first arc-shaped member fixed to the runner concentrically with a pivot point of the main arm base end; A second arc-shaped member fixed to the side frame concentrically with the pivot point of the main arm tip, and first and second arc-shaped members fixed at one end to the runner;
A chain-like, band-like or string-like body that is stretched around the outer peripheral portion of the arc-shaped member and the other end is fixed to the side frame, a platform slidably attached to the side frame in the front-rear direction, An elevating assist arm pivotally supported at a position near an opening and closing opening of the vehicle body, wherein a length between the first and second arc-shaped members of the chain, band, or cord is pivotally attached to the main arm. The distance substantially coincides with the distance between the points, and by driving the runner in the front-rear direction of the guide rail, an intermediate portion of the main arm is supported by the lifting / lowering auxiliary arm, and the main arm rotates, A slide-type elevating device for raising and lowering a platform in a substantially horizontal state. 2. A screw shaft supported in parallel with the guide rail and driven to rotate by an electric motor, and a nut member screwed to the screw shaft and fixed to the runner are provided. The slide type lifting device according to 1. 3. The slide-type lifting device according to claim 1, wherein the lifting assistance arm is provided with a roller that comes into contact with an intermediate portion of the main arm. 4. The slide type lifting device according to claim 1, wherein said lifting assistance arm is fixed to a lifting assistance cam which comes into contact with a roller pivotally attached to an intermediate portion of said main arm.