JP2002248984A - Slide mechanism for retractable loading platform lift - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slide mechanism for a retractable loading platform lift which permits overall length of the equipment to be shortened, a loading platform section to be moved freely along a guide rail and the space under a bed to be utilized usefully. SOLUTION: In the slide mechanism for the retractable loading lift wherein loading platform 5 is mounted to the bed 1 via a link mechanism so that the loading platform is lifted and lowered by means of a lifting means and a loading platform section including the link mechanism and the lifting means can be moved between a retracted position A under the bed and a operating position B rear of the bed, there are mounted a pair of extensible cylinders 61 between the bed and the loading platform section, both of the front ends of the pair of cylinders being connected to the respective side end of the bend and the rear ends of the cylinders being mutually joined around the center line of the bed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retractable loading / unloading platform in which a loading platform is slidable back and forth along a guide rail between a storage position below the loading platform and a working position behind the loading platform by a slide mechanism. More specifically, the present invention relates to the structure of the slide mechanism.

[0002]

2. Description of the Related Art Conventionally, a loading platform is provided on a loading platform via a link mechanism so as to be able to move up and down by a lifting mechanism, and the loading platform including the link mechanism and the lifting mechanism is moved by a slide mechanism to a storage position below the loading platform and a rear of the loading platform. A retractable loading tray elevating device that is configured to be slidable back and forth along a guide rail with respect to the working position of the storage tray is provided.

The slide mechanism in the conventional retractable loading / unloading device is constituted by a pair of left and right or two telescopic cylinders having both ends connected to the loading side and the loading side.

[0004] More specifically, in the case of a pair of left and right telescopic cylinders, they are arranged in parallel in the front-rear direction on both left and right sides in the width direction on the loading platform side and the loading receiving platform side at predetermined intervals. In the case of one telescopic cylinder, the telescopic cylinder is disposed at the center in the width direction in the front-rear direction.

[0005]

However, as in the above-described conventional case, a pair of left and right telescopic cylinders or one telescopic cylinder is arranged in a straight line in the front-rear direction.
The length of the front and rear installations by the telescopic cylinders is increased, and the increased length is subject to restrictions for avoiding interference with peripheral members and the like. This becomes more remarkable when the slide stroke on the load receiving side must be lengthened.

[0006] In particular, when one telescopic cylinder is disposed in the front-rear direction of the center, for example, if a spare tire is installed at a position where the telescopic cylinder is disposed, the ground height of the spare tire becomes low. There is a high possibility of interference with an obstacle on the road, and there is a problem that the space in the center cannot be used effectively.

In the case where the load receiving side is slid by a pair of left and right telescopic cylinders arranged in parallel, when the load receiving side is slid, pressure oil pulsation for operating the two telescopic cylinders is used. There is a case where the right and left slides are displaced on the load receiving side, which hinders a smooth sliding operation.

[0008]

According to a first aspect of the present invention, there is provided a slide mechanism in a retractable loading / unloading device of a retractable loading platform, wherein the loading platform is provided on the loading platform via a link mechanism so that the loading platform can be raised and lowered by the lifting mechanism. A slide mechanism in a retractable loading / unloading device that is configured so that the loading receiving side including the lifting / lowering means can slide back and forth along a guide rail between a storage position below the loading platform and a working position behind the loading platform by a sliding mechanism. A pair of left and right telescopic cylinders are provided between the loading side and the receiving side, and these telescopic cylinders have front ends connected to left and right sides in the width direction of the loading side, and have rear ends connected to each other. Are connected to the center in the width direction on the receiving table side.

[0009] The slide mechanism in the retractable loading tray elevating device according to the second aspect of the present invention, wherein the space formed in the center below the loading platform to which the front end of the telescopic cylinder is connected,
Spare tires are installed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a configuration of a slide mechanism in a retractable loading / unloading device according to the present invention.

In FIG. 1, reference numeral 1 denotes a loading platform mounted on a vehicle body frame 11, and a retractable loading platform lifting device 2 is provided below the rear end of the loading platform 1.

The retractable loading tray lifting device 2 includes a mounting member 3 provided on the vehicle body frame 11 and a loading tray 5 provided on the mounting member 3 via a link mechanism 4.

The mounting member 3 is slidable in the front-rear direction along an outward U-shaped guide rail 12 disposed in the front-rear direction at the rear end of the vehicle frame 11. Specifically, front and rear rollers (not shown) provided on the mounting member 3 are rotatably disposed in the guide rail 12, and the mounting member 3 is moved along the guide rail 12 by a slide mechanism 6 described later. By sliding, the entire retractable loading / unloading device 2 on the loading tray side can be slid forward and backward below the floor of the loading platform 1.

The link mechanism 4 includes a lower link 41,
And an upper link 42. The base ends of the lower link 41 and the upper link 42 are rotatably supported by the mounting member 3 side, and the lower link 41 or the upper link 42 is moved up and down by unillustrated lifting means provided on the mounting member 3 side. It is configured to be rotatable.

The above-described guide rail 12, mounting member 3,
Each member such as the link mechanism 4 and the lifting / lowering means is provided in a pair on the right and left sides of the vehicle frame 11. The right and left mounting members 3 are synchronized so that the connecting members 3 slide on the guide rail 12.
a.

The receiving table 5 includes a distal member 51 and a proximal member 52. The distal member 51 and the proximal member 52 are connected to each other by a hinge 53 so that the distal member 51 is located on the proximal side. The member 52 is formed so that it can be folded in two on the surface side.

A bracket 55 is connected to both left and right sides of the base end of the base side member 52 via hinges 54. The top ends of the brackets 55 are pivotally supported by the front ends of the left and right upper links 42. The lower link 4 on the left and right below it
One tip is pivotally supported.

That is, the proximal end member 52 is also mounted on the bracket 55.
Is foldably provided on the upper surface side, and the entire loading tray 5 is folded in three in the retracted state shown in FIG.

The distal end of the distal end side member 51 is formed in a wedge shape, and is tilted when the load receiving table 5 reaches the ground, so that the distal end comes into contact with the ground without any step.

In the storage type lifting / lowering device 2 configured as described above, the storage mechanism A slides the mounting member 3 to the front end of the guide rail 12 in the state where the loading tray 5 is folded by the slide mechanism 6, and stores the storage position A. (Refer to the solid line in FIG. 1), the mounting member 3 is slid to the rear end of the guide rail 12, and the folded loading tray 5 is deployed. In this deployed state, the loading tray 5 is moved between the ground and the floor of the loading tray 1. Working position B to be moved up and down by
(See the two-dot chain line in FIG. 1).

The above-mentioned slide mechanism 6 comprises a pair of left and right telescopic cylinders 61, 61 as shown in FIG. Specifically, each of the telescopic cylinders 61 is connected to the left and right sides of a mounting stay 62 extending in the width direction with its front end supported by the guide rail 12 serving as the loading platform 1 side, and has a rear end. The portions are connected to the distal end of a mounting stay 63 extending rearward from the center of the connection member 3a on the side of the receiving table 5. That is, each of the telescopic cylinders 61 is attached to the mounting stay 62 in a state of forming an isosceles triangle with the mounting stay 62 as a base.

Next, the operation of the retractable loading / unloading device 2 configured as described above will be described focusing on the sliding operation by the sliding mechanism 6.

First, in order to move the retractable loading / unloading device 2 from the storage position A stored below the loading platform 2 to the working position B as shown in FIG. 1, each telescopic cylinder 61 is extended. Due to the extension operation of the telescopic cylinder 61, the entire retractable loading / unloading device 2 slides along the guide rail 12 toward the rear end of the loading platform 2, and is located at the working position B as shown by a two-dot chain line in FIG. You.

At this time, as shown in FIG. 2, each telescopic cylinder 61 extends in such a manner that the center portions in the width direction of the retractable loading / unloading device 2 are pushed toward each other. Is not. That is, when the telescopic cylinders 61 are extended, the component forces at the distal ends of the telescopic cylinders 61 act perpendicular to the sliding direction, so that the respective component forces acting in the width direction of the retractable loading tray lifting device 2 are applied. As a result, the retractable loading tray elevating device 2 can be smoothly moved along the guide rails 12.

When the retractable loading tray elevating device 2 is placed at the working position B in this way, the proximal member 52 of the folded loading tray 5 is moved to the distal member 5 as shown by a two-dot chain line in FIG.
1 (the distal end member 51 is omitted in the illustration of the two-dot chain line in FIG. 1), and is rotated rearward so that the proximal end member 52 is unfolded so as to be on the same horizontal plane as the bracket 55. Subsequently, although not shown, the distal-side member 51 is rotated rearward, and the distal-side member 51 is developed so as to be on the same horizontal plane as the bracket 55 and the proximal-side member 52. As a result, the loading tray 5 can be moved up and down between the ground and the floor of the loading platform 1 by the lifting / lowering means, and the loading / unloading operation between the ground and the loading platform 1 through the loading tray 5 is performed by this lifting operation. Do.

Next, when the loading / unloading operation of the luggage is completed and the retractable loading / unloading device 2 is to be stored, the retractable loading / unloading device 2 is stored from the working position B by an operation reverse to the above-described operation. It is arranged at the position A. That is, at the work position B,
After the storage platform 5 of the retractable loading platform elevating device 2 is arranged at a predetermined height for storing, the storage platform 5 is folded in three, and the telescopic cylinders 61 are respectively retracted in this state. By the retracting operation of the telescopic cylinder 61, the entire retractable loading / unloading device 2 slides below the loading platform 2 along the guide rails 12 and is located at the storage position A as shown in FIG.

At this time, since each telescopic cylinder 61 is retracted by pulling the center part of the retractable loading / unloading device 2 in the width direction, the retractable loading / unloading device 2 is not displaced on the left and right. That is, when each telescopic cylinder 61 is retracted, as in the case of extending the telescopic cylinder 61 described above,
Since the component forces at the distal ends of the telescopic cylinders 61 act perpendicular to the sliding direction, the respective component forces acting in the width direction of the retractable loading / unloading device 2 cancel each other out and balance each other. The loading tray elevating device 2 can be moved smoothly along the guide rail 12.

Therefore, the retractable loading tray elevating device 2 can be smoothly moved back and forth by the slide mechanism 6.

Further, by arranging the telescopic cylinders 61 in an isosceles triangular shape as described above to constitute the slide mechanism 6, the installation length of the telescopic cylinders 61 in the front-rear direction can be reduced in the front-rear direction as in the prior art. Can be shortened as compared to those arranged in a straight line, and by this amount, constraints to avoid interference with peripheral members can be relaxed,
The front-back length of the entire device can be reduced.

Thus, a space for installing other members is formed in a central portion below the loading platform 1 to which the front end of the telescopic cylinder 61 is connected, and this space can be effectively used. .

As an example of utilizing the space, a spare tire 7 can be installed as shown in FIGS. Specifically, a support member 71 is fixedly provided at the center of the mounting stay 62, and the spare member 7 is supported by the support member 71 in a suspended state.

By installing the spare tire 7 in this manner, the telescopic cylinder 61 does not become an obstacle, so that the spare tire 7 is positioned at a height above the ground as far as possible without interfering with the retractable loading / unloading device 2. Can be installed in

[0034]

As described above, according to the slide mechanism of the retractable loading / unloading device of the present invention, a pair of right and left telescopic cylinders are provided between the loading platform and the receiving platform. The front end is connected to the left and right sides in the width direction on the loading platform side, and the rear ends are connected to the center in the width direction on the loading platform side. It is possible to reduce the length as compared with those arranged in a straight line in the direction, so that restrictions for avoiding interference with peripheral members and the like can be alleviated, and the front-to-rear length of the entire apparatus can be shortened.

Further, since the telescopic cylinder expands and contracts by pushing or pulling the center portions in the width direction of the load receiving side, the load receiving side is not displaced left and right, and the load receiving side is connected to the guide rail. It can be moved smoothly along.

In addition, a space for installing other members is formed in a central portion below the carrier to which the front end of the telescopic cylinder is connected, and this space is effectively used as a spare tire installation portion. Can be done,
Since the telescopic cylinder does not interfere, the spare tire can be installed at a position where the height above the ground is as high as possible without interfering with the retractable loading tray elevating device.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a slide mechanism in a retractable loading tray elevating device of the present invention.

FIG. 2 is a partially omitted plan view showing the configuration of a slide mechanism in the retractable loading tray elevating device of the present invention.

[Explanation of symbols]

 Reference Signs List 1 loading platform 12 guide rail 2 retractable loading platform lifting device 4 link mechanism 5 loading platform 6 slide mechanism 61 telescopic cylinder 7 spare tire

Claims (2)

[Claims] 1. A loading platform is provided on a loading platform via a link mechanism so as to be able to move up and down by lifting means, and the loading platform side including the link mechanism and the lifting mechanism is operated by a slide mechanism to store a position below the loading platform and work behind the loading platform. In a slide mechanism in a retractable loading / unloading device that is configured to be slidable back and forth along a guide rail between positions, a pair of left and right telescopic cylinders are provided between the loading platform and the loading platform. The telescopic cylinder has a front end connected to the left and right sides in the width direction on the loading side, and a rear end connected to the center in the width direction on the loading side. Slide mechanism in the lifting device. 2. A slide mechanism in a retractable loading tray raising / lowering device, wherein a spare tire is installed in a space created below a loading platform to which a front end of the telescopic cylinder is connected.