JPH0111561Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an improvement of a type of freight vehicle in which the entire loading platform moves back and forth and is tilted. More specifically, the present invention relates to an improvement in a support member that supports the lower surface of a cargo platform pushed out rearward.

[Conventional technology]

A type of freight vehicle in which the entire loading platform moves back and forth and tilts is described in Utility Model Publication No. 10176/1983. FIG. 3 explains this conventional freight vehicle. Same figure A
1 is a plan sectional view of the rear part of the truck, and FIG. 1B is a side view thereof. 1 is the chassis, and the rear wheel 2
is connected to chassis 1. A shaft 4 is provided at the rear of the chassis 1, and the loading platform sliding guide rail 5 is configured to be rotatable with respect to the chassis 1 using this as a rotational fulcrum. The loading platform slide guide rail 5 is a U-shaped frame as shown in Figure C, and has a plurality of rollers 8 (four in Figures A and B) that rotate around a shaft 81. has been done. The roller 8 is provided with a notch 82 in the upper part of the loading platform slide guide rail 5 so that its upper rotating surface can come into contact with the lower surface 63 of the loading platform rail 6. The loading platform 3 is fixed to a loading platform rail 6, and the loading platform rail 6 transmits a part of its load to the loading platform slide guide rail 5 by means of four rollers 8, and can move in the longitudinal direction A of the freight vehicle. A support member 7 is provided at the rear end of the loading platform slide guide rail 5 (third
In Figure A, there are one each on the left and right sides of the rear of the car). When the loading platform 3 moves rearward, the loading platform rail 6 moves on the rollers 8 as shown in FIG. ), the platform slide guide rail 5 rotates and tilts around the shaft 4 until the support member 7 comes into contact with the road surface 9. After the support member 7 touches the ground, the loading platform 3 can still move rearward, and a part of the load of the loading platform 3 after the movement is supported by the supporting member 7. If the loading platform 3 moves forward, the opposite process is followed.

In addition to the above configuration, a support member using a hydraulic device as described in Japanese Utility Model Application No. 56-118138 is known.

[The problem that the idea aims to solve]

In the above conventional configuration, the length of the support member 7 is adjusted by a fixed column or a hydraulic device, and in either configuration, the length does not change while the loading platform 3 moves back and forth. Loading platform 3 loaded with luggage
When moving forward and pulling up, while the support member 7 is in contact with the ground, the load of the loading platform 3 is supported by the support member 7 and the rear wheel 2 (via the shaft 4), but the center of gravity of the load As the truck moves closer to the shaft 4, a strong moment acts to rotate the chassis 1 clockwise around the rear wheels 2, so that the front of the truck is lifted up and the rear of the chassis 1 sinks downward.
In this case, if the support member 7 is away from the road surface 9, the load will be concentrated on the shaft 4, and the force of the above moment will be the largest. Therefore, if the support member 7 is kept in contact with the ground for as long as possible when the loading platform 3 is moved forward, and if part of the load can be supported by the support member 7, the force exerted by the moment described above will be weakened. It becomes possible to move the loading platform 3 smoothly.

In order to solve this problem, it is effective to increase the length of the support member 7 and decrease the inclination angle of the loading platform 3. If the inclination angle is small, the vertical movement width of the front part of the loading platform (there is a limit due to the design of the guide rail for tilting the loading platform (not shown)) can be made small, so even when the center of gravity of the load is passed by the shaft 4, the support member 7 can be made smaller. This is because it becomes possible to keep the vehicle in contact with the road surface 9. However, due to the design, there is a limit to the length from the axle to the rear end of the cargo bed, and in particular, when driving a freight vehicle in reverse, the rear angle α from the rear wheel contact point is limited.
If the support member 7 is a fixed support column, there is a limit to its length, as there are restrictions such as the fact that it is desirable that no member be present within the range of 12 degrees. Particularly today, there is a demand for lowering the height of the loading platform to facilitate loading and unloading of cargo, so it has become an issue to make the length of the support as short as possible in the design of freight vehicles. In addition, those with a structure that uses a hydraulic device to adjust the length of the support member require a hydraulic device, so the structure is complicated, the operation is complicated, maintenance is required, and the cost is high. There are problems such as rising. This idea is
It is an object of the present invention to provide a truck having a structure of a loading platform lower surface support member that solves the above-mentioned conventional problems with a simple structure and at low cost without using a hydraulic device.

[Means to solve the problem]

The present invention provides a freight vehicle having a chassis 1, a platform slide guide rail 5 rotatably provided at the rear of the chassis 1, and a platform rail 6 installed on the platform slide guide rail 5 so as to be movable back and forth. A support member 7 for grounding is provided at the rear end of the guide rail 5 for loading platform slide, and the support member 7
The upper tip of the truck is in contact with the lower surface of the loading platform rail 6, and the rear lower surface of the loading platform rail 6 has a curved portion that moves the upper tip of the support member 7 up and down in response to the back and forth movement of the loading platform rail 6. .

[Effect]

A support member 7 for grounding is provided at the rear end of the guide rail 5 for loading platform slide, and generally, one support member 7 is provided for each of the left and right guide rails 5 for loading platform sliding.
All you need to do is provide one. The support member 7 includes a cylinder 71 and a grounding member 7 arranged to be movable up and down inside the cylinder 71.
It is composed of 2. The cylinder 71 is fixed to the platform sliding guide rail 5, and a stress is applied to the grounding member 72 by a spring or the like provided inside the cylinder 71 so that it always moves upward within the cylinder 71. The upper end of the grounding member 72 is always brought into contact with the lower surface of the platform rail 6 by the stress of the spring or the like. Curved portion 61 of loading platform rail 6
When the loading platform is in the front (a situation in which a truck is driven), the upper tip of the grounding member 72 is located above the lower surface of the loading platform sliding guide rail 5,
Further, when the loading platform rail 6 moves rearward, the upper tip of the grounding member 72 is configured to move downward along the curved portion while coming into contact with the curved portion, and descend to the lower surface of the loading platform sliding guide rail 5. There is. Therefore, the feet 7 provided at the bottom of the grounding member 72
When the cargo platform 3 makes contact with the road surface 9, the length of the support member becomes longer, and the angle of inclination of the cargo platform 3 can be reduced.

〔Example〕

FIG. 1 is a rear side view of a freight vehicle showing an embodiment of the present invention, and FIG. 2 is a rear view of a portion thereof. Both show the loading platform rail in the front (normal position). In the figure, 1 is the chassis, 2 is the rear wheel, 3 is the cargo bed, 4 is the shaft, 5 is the guide rail for the cargo bed slide,
6 is a loading platform rail, 61 is a curved portion of the loading platform rail 6,
62 is a flat part of the loading platform rail, 7 is a support member, 71
is a cylinder, 72 is a grounding member, 73 is a foot, and 74 is a roller. The loading platform 3 is placed on the loading platform rail 6,
The loading platform rail 6 is engaged with the loading platform sliding guide rail 5 so as to be movable back and forth, and the loading platform sliding guide rail 5 is fixed to the chassis 1 via the shaft 4. The loading platform 3 is moved in the front and back direction by a hydraulic system (not shown) grounded at the front, and when moving backward, the front part of the loading platform 3 is moved by a guide rail for tilting the loading platform (not shown) installed in the front. (not shown) or by the second hydraulic system, the entire loading platform tilts as it moves backward. The loading platform 3 is tilted until the foot 73 of the grounding member 72 touches the road surface 9 (imaginary line in the figure), and after that, the loading platform 3 is tilted.
Only backward movement is performed. The entire grounding member 7 is held by the cylinder 71 being fixed to the rear part of the guide rail 5 for loading platform slide, and the grounding member 72 is arranged so as to be movable in the vertical direction inside the cylinder 71. It is always biased upward by the spring that is attached to it. Grounding member 7
A roller 74 is provided at the upper end of the roller 2 and is in contact with the lower surface of the loading platform rail 6. The lower surface near the rear end of the platform rail 6 has a tapered curved portion 61, and the other portion has a flat portion 62. Therefore, when the loading platform 3 is in the normal position, the rollers 74 are located above the lower surface of the loading platform slide guide rail 5 and are in contact with the lower surface of the loading platform rail 6, as shown by the solid line, and the loading platform 3 is in the rearward position. Colo 7 when moving
4 moves downward along the lower surface of the curved portion 61 and comes into contact with the lower surface of the flat portion 62, and as the loading platform 3 moves, the grounding member 72 moves up and down in accordance with the depth B of the curved portion 61. That will happen.

[Effect of idea]

Since the present invention has the above-mentioned configuration, when the loading platform is in the normal position, the grounding member is in a state that escapes upward, and when the loading platform is tilted, the grounding member is in a state that protrudes downward. It became a freight vehicle that solved the problems of .

[Brief explanation of the drawing]

FIG. 1 is a rear side view of an embodiment of the present invention, FIG. 2 is a partial rear view thereof, and FIG. 3 is an explanatory diagram of the prior art. 1 is a chassis, 3 is a loading platform, 4 is a shaft, 5 is a guide rail for loading platform sliding, 6 is a loading platform rail, 61 is a curved portion, 7 is a supporting member, 72 is a grounding member, and 74 is a roller.

Claims (1)

[Scope of utility model registration request] In a freight vehicle having a chassis, a guide rail for a platform slide rotatably provided at the rear of the chassis, and a platform rail installed so as to be movable back and forth above the guide rail for the platform slide, the rear end of the guide rail for the platform slide. A support member is provided for grounding, the upper tip of the support member contacts the lower surface of the loading platform rail, and the rear lower surface of the loading platform rail has a curved portion that moves the upper tip of the supporting member up and down in response to the back and forth movement of the loading platform rail. A freight car featuring