JPS6320595Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The invention is a lift device for freight cars that serves as a horizontal platform during cargo handling, and that stands up (vertical) to serve as a door (or tilt) when driving. Regarding
In particular, it concerns its safety equipment.

(Prior art) Generally, this type of lift device is
As disclosed in Publication No. 36270, the platform rises and falls horizontally during cargo handling, and when the cargo handling is finished, the horizontal platform rises and stands up to serve as a door, gate, etc.; In order to prevent the platform from standing up due to the lifting and lowering operations, when the platform is leveled at the start of cargo handling, the engaging part that engages with the cam of the parallel link mechanism that raises and lowers the platform is released using a manual operation lever to raise and lower the platform. The platform is constructed so that it does not rotate even when the platform is raised.

(Problems to be solved by the invention) Cargo handling work is frequently performed on such freight vehicles, and the operation of moving the platform in an upright position horizontally is essential for cargo handling work. Although this is always done, the operation of releasing the engagement part using the manual operation lever is difficult because the platform is in a horizontal state at the time.
When cargo handling work has to be carried out in a hurry, it may be forgotten or may not be released reliably due to erroneous operation. If the engagement part is not released, the cargo will be placed on the lowered platform and
When the platform is raised to load this cargo onto the loading platform of a freight vehicle, there is a problem in that the platform rotates to an upright position, causing the cargo and workers on the platform to fall, creating a very dangerous situation. Ta.

The present invention has been developed based on the above-mentioned problems, and is intended to prevent the platform from rotating during cargo handling work due to operator error and to safely perform the work. The purpose of this invention is to provide a safety device for a truck lift device that can be used in a truck.

[Structure of the invention] (Means for solving the problems) The present invention provides a lift device for a freight vehicle that rotates by an engaging means as the platform moves up and down under the control of an appropriate lifting mechanism. an engaging part that is engageable with the engaging means when the platform is raised; and an engaging part that is disengaged from the engaging part in conjunction with a rotational movement of the platform from standing up to a horizontal position. The device includes a disengagement bullet that holds the platform in position, and a manual operation unit that holds the engagement portion in the engagement position against the force of the bullet when the platform rotates from horizontal to upright. It is something that

(Function) At the start of cargo handling work, the engagement part and the engagement means are automatically disengaged in conjunction with the rotation of the platform from standing up to horizontal, and the engagement part is moved by the elastic force of the bomb. The platform is held in the released position and does not rotate even when the platform is raised or lowered.

(Example) Next, an example based on the above characteristics of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, in a lift device configured such that a platform 1 is rotated by an engaging means A as it moves up and down under the control of a parallel link mechanism 2, one link in the parallel link A cam 3 forming an engaging means A is pivotally attached to the base end of the arm 2a, and an engaging member 3a of the engaging means A is rotatably provided on the cargo bed side on the side of the cam 3. 3a is provided with a tensioning spring 5 for rotating the member 3a in the disengagement direction, and a handle 6 as a manual operation part is provided on the pivot 4 of the engaging member 3a.

As shown in FIG. 1, since the engaging member 3a is always held in the disengaged position by the tensile force of the bomb 5, the cam 3 and the engaging member 3a do not engage with each other and the platform 1 is not engaged during cargo handling operations. moves up and down reliably while remaining horizontal.

When the platform 1 is erected after cargo handling and used as a rear door, first grasp the handle 6 and move the engagement member 3a fixed to the pivot 4 against the force of the spring 5 to the engagement position shown in FIG. Continue to rotate and hold.

When the platform 1 is raised in such a state, the platform 1 rotates due to the engagement between the cam 3 and the engaging member 3a and is stored in an upright state. In addition, when starting cargo handling, the platform 1 rotates from an upright position to a horizontal position and descends a little, and the cam 3 engages the engaging member 3.
When the engaging member 3a moves away from the position a, the force of the bullet 5 automatically holds the engaging member 3a from the engaged position to the released position shown in FIG. There is no risk of engagement of the cam 3 or operation errors such as forgetting or erroneous operation by the operator. In addition, the lifting mechanism is not limited to parallel links, but also includes cylinders and rollers, rails or motors, chains,
It may also be composed of a sprocket or the like.

The above describes a type in which the engaging means A is provided on the link arm.
This section explains the type of platform-mounted type.

That is, the engaging portion 3b of the engaging means B is formed at the base end of the platform 1, and the engaging member 3c is formed on the loading platform side.
is rotatably provided, a tensioning bullet 5 for rotating the member 3c in the disengagement direction is provided, and a handle 6 is provided on the pivot 4 of the engaging member 3c. In the figure, 7 is a restraining wall of the engaging member 3c.

As shown in FIG. 3, the engaging member 3c is always held in a hanging state, that is, in the disengaged position by the force of the bullet 5, and when the handle 6 is operated, the engaging member 3c resists the force of the bullet 5. The platform 1 is rotated by raising and lowering the platform 1 while holding it in the horizontal state, that is, in the engaged position as shown in FIG.

At the start of cargo handling, when the platform 1 rotates from an upright position to a horizontal position and descends a little, the engaging part 3b separates from the engaging member 3c.
It is automatically held in the release position by the force of .

Although two embodiments have been shown as the engagement means, it is of course applicable to other types. Also, although a lever is shown as a holding member, a solenoid,
It may also be a cylinder, etc. Further, although the engaging member is shown as being moved to the release position by rotation, it may be moved by sliding or the like. Also, the operating cylinders of the parallel links are not shown.

As described above, the present invention is a lift device for a freight vehicle in which the platform 1 is rotated by the engaging means A and B as the platform 1 moves up and down under the control of the parallel link mechanism 2. In conjunction with the rotation from the standing position to the horizontal position, the engaging member 3a,
3c is automatically forcibly removed from the engaged position, the danger of the platform 1 rotating as the platform 1 moves up and down during cargo handling operations and causing an unexpected accident such as falling is eliminated, and a high level of safety is achieved. Ru.

In addition, since the platform 1 is rotated by the manual operating section while holding the engaging members 3a and 3c in the engaged position against the force of the ammunition 5, the operation is simple and reliable, and there is no need to worry about operational errors. This has a great practical effect.

[Effects of the invention] As detailed above, according to the invention, the engaging portion is released from the engaging means by the force of the bullet in conjunction with the rotation of the platform from standing to horizontal, and is held in the released position. This is a safety device for truck lift equipment that prevents the platform from rotating during cargo handling operations due to operator errors and causing unforeseen accidents. can be provided.

[Brief explanation of the drawing]

1 and 2 are side views showing the operation of one embodiment of the present invention, and FIGS. 3 and 4 are side views showing the operation of another embodiment. 1...Platform, 2...Parallel link mechanism, 3a, 3c...Engaging member (engaging portion), 5...
Bullet machine, 6...handle (manual operation part), A, B...
...Engagement means.

Claims (1)

[Scope of utility model registration request] In a truck lift device in which a platform rotates by means of an engaging means as the platform moves up and down under the control of an appropriate elevating mechanism, the platform is provided so as to be engageable with the engaging means and is engaged with the engaging means when the platform is raised. an engaging part that moves the platform from a horizontal position to a horizontal position, an engagement release spring that disengages the engaging part and holds the platform in a released position in conjunction with a rotational movement of the platform from a standing position to a horizontal position; 1. A safety device for a truck lift device, comprising: a manual operation section that holds the engagement section in the engagement position against the force of the bullet during a rotational movement.