JPS6342705Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a platform lift-type transport vehicle in which the platform is raised and lowered by an elevating mechanism, and the purpose of this invention is to facilitate movement in places with steps such as stairs.

Generally, in a transport vehicle, when climbing up the stairs 6, the center of curvature Q of the front end of the traveling device 1 is located lower than the height H of the stairs 6, as shown in FIG. Because of the contact with the surface 6b, it was not possible to climb the stairs, so a step board or the like was used to climb the stairs 6.
That is, once the vehicle starts climbing the stairs, it moves smoothly, but it has difficulty climbing the first step of the stairs.

Therefore, this invention was devised in view of the above circumstances, and is constructed as follows. That is, in a cargo lift type transport vehicle in which a cargo platform 5 is provided on a chassis 2 equipped with a traveling device 1 so as to be able to be raised and lowered by an elevating mechanism 4, the lower end P at the lowest position is lower than the position of the center of curvature Q of the front end of the traveling device 1. A support member 7, which is on the lower side, is provided protruding from the loading platform 5 on the front side of the traveling device 1, and when the lifted loading platform 5 is lowered, the supporting member 7 comes into contact with the tread 6a of the stairs 6, and the front side of the vehicle platform 2 is lowered. The traveling device 1 was raised to the top of the stairs 6 so that the traveling device 1 could run onto the stairs 6.

By configuring this invention as described above, the following effects can be achieved. That is, when the transport vehicle is about to climb up the stairs 6, first, the lifting mechanism 4 lifts the loading platform 5 until the lower end P of the support member 7 provided below the loading platform 5 is at least the height of the stair tread 6a. After that, the carrier is moved forward slightly until the support member 7 is positioned on the stair tread 6a. Then, if the loading platform 5 is lowered and the lower end P of the support member 7 is brought into contact with the ground, and the loading platform 5 is further lowered, the front of the vehicle platform 2 will float, but when the loading platform 5 is at the lowest position, the support Since the lower end P of the member 7 is provided as far as possible below the center of curvature Q at the front end of the traveling device 1, the center of curvature Q is higher than the stair tread 6a, and if the transport vehicle is moved forward in this state, it will not travel. The device 1 can now climb up the stairs 6. That is, in this invention, the front side of the traveling device 1 is raised to climb up the stairs 6 by using the lifting function of the platform lift-type transport vehicle, and there is no need to use an amyu board or the like as in the past. This made it possible to move up and down the stairs extremely efficiently.

Next, embodiments of this invention will be explained based on the drawings.

A traveling device 1 consisting of a pair of right and left crawlers is provided at the lower part of the chassis 2, and allows the transport vehicle to move and travel. An elevating mechanism 4 for elevating and lowering an elevating frame 8 is provided on a fixed frame 3 fixed to the vehicle chassis 2.

The elevating mechanism 4 is of a left and right cross-link type consisting of a main link 9 and a sub-link 10.
One end 11 of the main link 9 is pivotally supported by the end of the fixed frame 3, and the other end is rotatably engaged with a guide rail 12 with a groove-shaped cross section fixed to the elevating frame 8 via rollers 13. ing. Sublink 10
is connected and supported at the center by a shaft 14 in a manner that intersects with the main link 9, one end of which is pivotally supported by a pivot shaft 15 at the end of the elevating frame 8, and the other end is connected to the fixed frame 3 via a roller 16. The guide rail 17 is rotatably engaged with a guide rail 17 having a groove shape in cross section. This cross link is operated by a double-acting hydraulic cylinder 18 attached to the main link 9 and the chassis 2.

In this embodiment, the elevating mechanism 4 is of a cross-link type, but it may be of any type as long as it raises and lowers the platform frame 5 horizontally, for example, it may be of a parallel link type.

A cargo platform 5 is attached to an elevating frame 8 that is raised and lowered by the elevating mechanism 4 made of the cross link, and a cargo platform frame 19 is formed on the upper part of the elevating frame 8 . A support member 7 that pivotally supports a support roller 20 rotatable in the longitudinal direction of the vehicle chassis 2 is provided at the lower part of the platform 5 on the front side of the traveling device 1, and the support member 7 can be removed from the platform 5 with bolts 22. It is fixed freely. The lower end P of the support roller 20 is connected to the loading platform 5.
is configured to be located below the center of curvature Q of the front end of the traveling device 1 when it descends the most.

3 and 4 show the effect of this invention when climbing up the stairs 6. First, the platform 5 is raised by the lifting device 4 so that the lower end P of the support roller 20 is higher than the height H of the stair tread 6a, and then the carrier is moved forward slightly.

Next, as the loading platform 5 is lowered, the support roller 2
0 touches the stair tread 6a, and the front of the traveling device 1 rises up. If the transport vehicle is moved forward in this state, the traveling device 1 can easily climb up the stairs 6.

Incidentally, the support member 7 is not limited to the above-mentioned embodiment, and the present invention may also be implemented by using a sled-like body 23 whose lower end P is made of a smooth round bar, pipe, etc., as shown in FIG. It is possible to implement.

[Brief explanation of the drawing]

Figure 1 is a side view of the main parts of a conventional transport vehicle;
Fig. 2 is a side view of a platform lift type transport vehicle according to this invention, Figs. 3 and 4 are explanatory diagrams showing the operation of this invention, and Fig. 5 is a side view of main parts showing another embodiment. . 1... Traveling device, 2... Vehicle chassis, 4... Elevating mechanism, 5...
Loading platform, 6... Stairs, 6a... Stair treads, 7... Supporting member, P... Lower end of supporting member, Q... Center of curvature of the front end of the traveling device.

Claims (1)

[Scope of utility model registration request] In a cargo lift type transport vehicle in which a cargo platform 5 is provided on a chassis 2 equipped with a traveling device 1 so as to be movable up and down by an elevating mechanism 4, the lower end P is lower than the center of curvature Q position of the front end of the traveling device 1 at the lowest position. Side support member 7
is protruded from the loading platform 5 on the front side of the traveling device 1, and when the lifted loading platform 5 is lowered, the support member 7 comes into contact with the tread 6a of the stairs 6, raising the front side of the vehicle platform 2, and the traveling device 1 moves up the stairs. 6. A device for climbing up stairs in a cargo platform lift type transport vehicle, characterized in that it is capable of climbing onto the top.