JPS6243866Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a loading platform storage control device in a loading platform lifting/lowering device.

As shown in Fig. 1, the conventional cargo platform elevating device has a tension link 02 and a compression link 0 that are pivotally supported on the vehicle body 01 side.
3 supports the loading platform 04, and the links 02,
03 is rotated by a hydraulic cylinder 05, the cargo receiving platform 04 is raised and lowered in a horizontal state, and the single-acting cargo receiving platform storage cylinder 06, which forms a part of the compression link 03, is extended. The cargo receiving platform 04 is then stored upward.

However, in the case of the above structure, when the loading tray is stored in the storage position, that is, in the vertical position, the center of gravity G of the loading tray is located to the left in FIG. 1 from the rotation center 0 of the loading tray. There is a danger that the loading platform will be pulled out and rotate beyond its vertical position.

In addition, in order to return the loading platform to the operating state, the loading platform cannot be returned to the operating condition by its own weight alone, and the manual effort of an operator is required.

The present invention is intended to eliminate the above-mentioned drawbacks, and the following embodiments will be explained with reference to the drawings. Reference numeral 1 denotes a mounting member installed vertically at the rear of a truck body 2, and a rotating shaft 3 is fixed to the mounting member 1. A shaft 4 is provided.

The base end of a tension link 6 is pivotally supported on the rotating shaft 3 via an arm 5, and the fixed shaft 4 has a compression link composed of a compression link main body 7 and a single-acting loading platform storage cylinder 8. The base end of 9 is the bracket 10
It is pivoted through.

The tips of both the links 6 and 9 are pivotally supported at the upper and lower rear end positions of the loading platform 11, and by the extension of the storage cylinder 8, the loading platform 11 is moved to the pivot point 0 with respect to the tension link 6.
It is designed to rotate upwards, that is, to the retracted position.

A cross beam 12 and a rotating shaft 3 provided on the tension link 6
A cylinder 14 for raising and lowering the loading platform is provided between the arm 13 provided at Moreover, by returning the pressure oil in the lifting cylinder 14 to the tank (not shown) side, the loading platform 11 is lowered by its own weight. 15 regulates the rotation of the loading platform 11 beyond the stored state, and also controls the loading platform 1.
1 is a loading platform storage control device for returning the device to a use state, that is, a horizontal state, by its own weight, and the control device 1
5 is a bending link 16 which is a regulating member and a spring 1
It consists of 7.

The bending link 16 has brackets 18 at both ends,
It is pivotally supported by the crossbeam 12 and the loading platform 11 via the crossbeam 18, and when the loading platform 11 reaches the storage position, the bending link 16 becomes substantially in a straight line to prevent the loading platform 11 from rotating any further. It's becoming like that.

The spring 17 is provided on a shaft 19 that pivotally supports the bending link 16 and the bracket 18 on the crossbeam 12 side, and has one end attached to the crossbeam 12 and the other end attached to the bending link 1.
The springs 17 are adapted to be engaged with engagement pins 20 provided at 6, respectively, so that the spring 17 biases the cargo receiving platform 11 in a direction to return it to a horizontal state when the receiving platform is in the retracted state.

Reference numeral 21 denotes a safety device for preventing the rotating shaft 3 from rotating while the loading platform 11 is being raised and lowered;
is composed of a circular arc plate 22 and an engaging pin 23.

In the embodiment, the spring is provided between the bending link and the crossbeam, but the same effect can be obtained even if the spring is provided between the bending link and the loading platform.

The present invention has the above-mentioned structure. Next, the operation will be explained. When the loading platform 11 is raised, the second
When the lifting cylinder 14 is extended from the state shown by the one-dot chain line in the figure, each link 6, 9 rotates upward, and the loading platform 1
1 rises in a horizontal state.

When the loading platform 11 is lowered, the pressure oil in the lifting cylinder 14 is returned to the tank side from the state shown by the solid line in FIG. 2, and the loading platform 11 is lowered by its own weight.

Next, when storing the loading platform 11, when the storage cylinder 8 is extended from the state shown by the solid line in FIG. When the platform 11 is in the retracted position, that is, in the vertical state, the bending link 16 becomes substantially in a straight line, and prevents the loading platform 11 from rotating any further.

When the loading platform 11 is put into use, the pressure oil in the storage cylinder 8 is returned to the tank side, and since the bending link 16 is biased in the bending direction by the spring 17, the loading platform 11 is forcibly moved. When the loading platform 11 is rotated clockwise and the center of gravity G of the loading platform 11 moves to the right from the rotation center 0 of the loading platform 11, the loading platform 1
It will rotate to a horizontal state with its own weight of 1.

As described above, in the present invention, a regulating member is provided between the loading platform and the cross beam, and a spring is provided between the regulating member and the horizontal beam or loading platform, so that rotation of the loading platform beyond the retracted state is prevented. This can be reliably controlled, and furthermore, the loading platform can be automatically rotated to the operating state without relying on human power as in the past.

Furthermore, since the regulating member and the spring are provided in combination, the entire structure becomes very compact and can be installed in a small space.

[Brief explanation of the drawing]

Fig. 1 is a conventional example, Figs. 2 and 3 are general views of the present invention, Fig. 4 is Fig. 3 A-A, and Fig. 5 is a
It is a sectional view taken along line B-B. 6 is a tension link, 8 is a cylinder for storing a loading platform,
9 is a compression link, 11 is a loading platform, 15 is a loading platform storage control device, 16 is a bending link, and 17 is a spring.

Claims (1)

[Scope of utility model registration request] The cargo platform is held horizontally by a tension link and a compression link that are pivotally supported on the vehicle body side, and is raised and lowered by a lifting cylinder, and a single-acting cargo platform storage cylinder that is part of the compression link is used to raise and lower the cargo platform. In the loading platform elevating device that allows the loading platform to be retracted upward, a regulating member is provided between the cross beam provided on the tension link and the rear end of the loading platform to prevent the loading platform from rotating beyond the retracted state. A loading platform storage control device for a loading platform lifting/lowering device, comprising: a spring biased in a direction to return the loading platform to a horizontal state between the regulating member and the crossbeam or loading platform;