JPS6232915Y2 - - Google Patents

Description

[Detailed explanation of the invention] In this invention, one end of the cross link that is pivotally supported in the center is pivotally supported between the vehicle body and the loading platform, and a roller that is pivotally supported at the other end is fitted into rails provided on the vehicle body side and the loading platform side respectively. At the same time, by expanding and contracting this cross link, the loading platform can be kept parallel to the vehicle body and moved up and down, and a notch is provided in the rail on either the vehicle body side or the loading platform side. This invention relates to a lift/dump switching device for a lift/dump transport vehicle in which the loading platform is tilted with respect to the vehicle body by disengaging the rollers from the rails, and the roller movement of the cutout portion is smoothed.

There are transport vehicles that use cross-links to function as both a lift and a dump, but these lift/dump switching devices have cutouts in the rails that fit the rollers.
Since this notch is directly opened and closed, the sliding surface of the roller becomes uneven at this notch, and the movement of the roller, that is, the movement of the loading platform, is not smooth, and there is a concern that the load may fall.

This invention is intended to eliminate such inconveniences and is constructed as follows. That is, in a lift/dump carrier that is equipped with a cargo platform 11 on the upper part and a cross link 10 that enables the cargo platform 11 to perform lift and dump operations, the cross link 10 of the pivot shaft 6 passing through the cross link 10 A notch 4 is provided in the rail 3 on which the roller 2 that is pivotably supported is fitted on the outer side and rolls, and a guide body 5 that prevents the roller 2 from separating from the notch 4 is provided on the pivot shaft 6. This is a lift/dump switching device for a lift/dump transport vehicle which is detachably provided on the inner side of a cross link 10.

By configuring this invention as described above, the invention has the following technical effects. That is,
When moving the roller 2 without separating it from the rail 3 to move the loading platform up and down parallel to the vehicle body, a guide body 5 slides into contact with the roller pivot shaft 6 to control the movement of the notch 4 of the roller 2.
Since the rollers 2 are guided by the rollers 2, it is possible to completely eliminate vertical movement of the rollers 2, and the movement of the rollers 2 is smooth, eliminating unstable movement of the loading platform. or,
A configuration in which a pivot shaft 6 is passed through the cross link 10, a roller is pivotally supported on the outside of the cross link 10 of the pivot shaft 6, and a guide body 5 is provided inside is, for example, between the roller 2 and the cross link 10. Since the cross link 10 is provided closer to the rail 6 than in the configuration in which the guide body 5 is provided, the distance between the left and right cross links can be made larger within the limited width of the left and right rails 3.
This makes it possible to realize a cross-link type loading/unloading platform lift device that is strong enough to cope with stresses such as torsion received when lifting the loading platform. Furthermore, in the conventional configuration in which the guide body 5 directly opens and closes the notch 4, the guide body 5 must be placed in a limited narrow space; Avoiding direct opening and closing of 4, the pivot shaft 6 is configured as described above,
By arranging the position of the guide body 5 that engages and disengages from the pivot shaft 6 within the space between the left and right cross links 10, which has a relatively large space, the position of the guide body 5 can be freely selected in the direction of the pivot shaft 6. At the same time, the work of assembling the guide body 5 becomes easier. Furthermore, the guide body 5 needs to have a strong structure to prevent the roller 2 from lifting up during lifting, and in the structure where the guide body 5 is provided in the notch 4, it is necessary to have a strong structure to strengthen the guide body 5 part. The guide body 5 naturally becomes bulkier than the width of the rail 3, and due to this bulk, the upper rail 3 cannot approach the lower rail 3 when the lift is lowered.
However, there is a problem in that the ground clearance of the loading platform 11 becomes high, which makes it difficult to load cargo, etc.
As in this invention, the above-mentioned problems can be solved by making the guide body 5 detachable from the inner side of the cross link 10 of the pivot shaft 6 at a position away from the rail 3.
When the lift is lowered, the upper and lower rails 3, 3 can be brought into substantially close contact with each other, and the ground clearance of the loading platform 11 can be lowered.

Next, an embodiment of this invention will be described with reference to the drawings. A loading platform 11 having a driving unit 9 on one side of a vehicle body 8 having a traveling device consisting of a crawler 7 and connecting the left and right side portions to the vehicle body 8 with cross links 10 on the other side. will be established. The driving unit 9 is provided with an operation unit 12 for operating a traveling operation and a hydraulic operation for horizontally raising and lowering the platform 11 or tilting it.

The cross link 10 is composed of a main link 14 having a hydraulic cylinder 13 mounted between it and the vehicle body 8, and a sub link 15 pivotally supported in the middle of the main link 14. One end of the main link 14 is pivotally supported on the side end of the vehicle body 8, and the other end is pivotally supported with a roller 2, and the roller 2 is fitted into a rail 3 provided on the loading platform 11. The side of the sub link 15 that is the same as the side of the main link 14 that is pivoted to the vehicle body 8 is pivoted to the side end of the loading platform 11, and the other end is pivoted to the roller 2, and the roller 2 is pivoted to the vehicle body 8. Fit into the provided rail 3. Rail 3 on the car body 8 side
A notch 4 is provided in the hole. Therefore, roller 2
If it does not separate from the notch 4, the loading platform 11 is moved to the vehicle body 8 by expanding and contracting the hydraulic cylinder 13.
When the roller 2 leaves the notch 4, the loading platform 11 tilts around the pivot point of the main link 14 to the vehicle body 8 by expanding and contracting the hydraulic cylinder 13. I will do it.

Next, FIGS. 3 and 4 show a switching device that allows the roller 2 of the sub link 15 to be removed from the notch 4 of the rail 3. A pivot shaft 6 for pivotally supporting the roller 2 is provided to pass through the sub link 15. One end of the pivot shaft 6 located inside the sub-link 15 is screwed into a screw shaft 18 provided across the left and right rails 3 of the vehicle body 8, and the support frame 19 is guided by rotation of the switching lever 1. A guide body 5 that moves in the axial direction of the pivot shaft 6 within the groove 20 is configured to come into sliding contact. At the position where the guide body 5 is in sliding contact with one end of the pivot shaft 6 of the roller 2, the roller 2 does not come off from the notch 4, and at the position where it is not in sliding contact, the roller 2 is moved from the notch 4 of the rail 3. It becomes possible to leave.

In this way, while the roller 2 moves in the notch 4, the guide body 5 slides on the pivot shaft 6 other than the roller 2 to prevent the roller 2 from coming off the rail 3.
The structure can be as simple as simply providing the notch 4, and the roller 2 does not come into contact with the corner of the notch 4, causing the sub-link 15 to move up and down. This will allow it to move smoothly. Furthermore, since the guide body 5 is not provided in the notch 4, the guide body 5 and the surrounding structures of the guide body 5 do not protrude from the lower rail surface 3a, and when the lift descends, the guide body 5 and the surrounding structures of the guide body 5 do not protrude from the upper rail surface 3b. The lower rail surface 3a can be brought into substantially close contact. That is, the ground clearance of the loading platform 11 located above the upper rail 3 can be lowered when the lift is lowered, thereby improving the workability of loading cargo and the like.

[Brief explanation of the drawing]

The figures show an embodiment of this invention, with Fig. 1 being a front view, Fig. 2 being a partially enlarged front view, Fig. 3 being a plan view showing the switching device, and Fig. 4 showing the switching device. It is a front view. 2...Roller, 3...Rail, 4...Notch, 5
... Guide body, 6 ... Roller pivot shaft, 10 ... Cross link.

Claims (1)

[Scope of utility model registration request] In a lift/dump transport vehicle equipped with a loading platform on the upper part and a cross link that enables the loading platform to perform lift and dump operations, a roller that is pivoted on the outer side of the cross link of a pivot shaft that penetrates the cross link is provided. A lift is provided with a notch in the rail to be fitted and rolled, and a guide body for preventing the roller from coming off from the notch is removably attached to the inner side of the cross link of the pivot shaft. Lift/dump switching device for dump and transport vehicles.