JPS5826830Y2 - Locking device for loading platform in loading/unloading equipment - Google Patents

Description

[Detailed description of the invention] This invention is a loading/unloading device that is installed in the opening of a vehicle loading platform or cargo box, etc. to load and unload cargo, and maintains a cargo receiving platform that is pivotally supported in an undulating state. Regarding a locking device for.

In recent years, in order to load and unload cargo onto the loading platform or cargo box of a vehicle, a loading platform held almost horizontally is installed at the opening of the loading platform or cargo box, etc., and the floor surface of the loading platform, etc. is connected to the road surface. Cargo handling lifting devices that move up and down between the two have come into use.

For example, the one shown in Fig. 1 is a loading/unloading device that is attached to the rear opening of a cargo box of a bread-type truck, with space equal to the width of the opening being spaced on both sides of the opening. A runner 2 that is driven by a hydraulic cylinder device (not shown) and moves up and down along the column 1 is provided in a column 1 that stands parallel to each other. It is pivoted so that it can rise and fall freely.

The load receiving platform 3 is laid down almost horizontally and moves up and down from a raised position where its upper surface is almost flush with the floor of the cargo box to a lowered position where its lower surface touches the road surface, allowing it to load cargo. In addition to unloading, the lower half of the opening is closed by raising the container to the raised position and then standing it up in a substantially vertical position except during cargo handling.

Further, the upper half of the opening is connected to an upper door 4 whose upper end is pivotally supported.
It can be opened and closed by.

In order to maintain the upright state of the loading platform 3, conventionally, a means has been taken to lock the upper end of the loading platform 3 using a locking device fixed to the runner 2. In order to hold the runner 2 in position, a locking device is separately provided to fix the runner 2 to the column 1, so that the runner 2 can be locked in place due to oil leakage from the hydraulic cylinder device or hydraulic piping, or vibrations caused by the running of the vehicle. was prevented from descending relative to column 1.

That is, a locking device for holding the loading platform 3 in an upright state and a locking device for fixing the runner 2 to the column 1 were provided separately.

This invention aims to provide a locking device that can hold the cargo receiving platform 3 in an upright state, fix the runner 2 to the column 1, and has a simple structure.

This invention will be described in detail below based on embodiments shown in the drawings.

In FIG. 1, reference numeral 5 denotes a locking pawl rotatably provided on the side end surface of the loading platform 3, and 6 denotes an engaging member fixed to the column 1.

As shown in FIGS. 2 to 4, the locking pawl 5 extends substantially horizontally in the vertical center of the load receiving platform 3 and is pivotally supported on both left and right sides of the load receiving platform 3. The elastic force of a torsion coil spring 8, which is fixed to both the right and left ends of a shaft rod 7 which protrudes from the end thereof, and which protrudes in the radial direction of the shaft rod 7, and is fitted into the shaft rod 7, as shown in FIG. , the shaft rod 7
It is constantly biased to rotate counterclockwise around .

A support shaft 9 is protruded from one side end surface of the load receiving platform 3 near the shaft rod 7 and approximately parallel to the shaft rod 7, and the base end of the handle 100 is rotatably pivoted by the support shaft 9. support

One end of a link 11 is rotatably attached to a pin 12 approximately at the center of the handle 10 at a predetermined distance from the base end, and the other end of the link 11 is connected to the locking pawl 5 by the shaft rod. The handle 10 and the locking pawl 5 are pivoted by a pin 14 to a bracket 13 protruding in a direction opposite to the protruding side of the locking pawl 5 in the radial direction of the handle 10, and the handle 10 and the locking pawl 5 are rotated in directions opposite to each other. Concatenate so that

A torsion coil spring 15 is inserted into the support shaft 9, and the handle 10 is centered around the support shaft 9, as shown in FIG.
Constantly biased to rotate clockwise.

Further, a locking metal fitting 16 having a substantially L-shaped cross section is protrudingly provided on the side end surface of the cargo receiving platform 3 corresponding to a position below the center of the handle 10, so that the end edge of the handle 10 is secured to the locking metal fitting 16. It comes into contact with the stopper 16 to prevent the handle 10 from rotating in the counterclockwise direction in FIG.

On the other hand, the engaging member 6 is attached to the tip of a mounting plate 17 having a substantially L-shaped cross section fixed to the column 1 in a manner corresponding to the position of the locking pawl 5 when the load receiving platform 3 is erected. The recess 6a into which the retaining claw 5 is fitted is fixed with the recess 6a facing upward.

To explain the operation of the embodiment of the invention configured as above, first, when the locking device is engaged, as shown by the solid line in FIG. of the torsion coil spring 1 by raising the handle 10 up until it comes into close contact with the engaging member 6.
By rotating counterclockwise around the support shaft 9 against the elastic force of the torsion coil spring 5, the locking pawl 5 is rotated counterclockwise through the link 11 against the elastic force of the torsion coil spring 8. Then, rotate it clockwise about the shaft rod 7 so that the locking pawl 5 does not come into contact with the engaging member 6, and further raise the cargo receiving platform 3 until it becomes almost vertical. By raising the locking claw 5 up to this point, the tip of the locking claw 5 is fitted into the recess 6a of the engaging member 6.

Thereafter, when the handle 10 is rotated clockwise around the support shaft 9, the locking pawl 5 is rotated counterclockwise around the shaft rod 7 via the link 11, and at a point in FIG. As shown by the chain line, when the handle 10 is inserted into the recess 6a of the engagement member 6 and further rotated, the edge of the handle 10 comes into contact with the locking metal fitting 16, as shown in FIG.
The locking pawl 5 reliably engages with the engaging member 6, and the loading platform 3 is completely locked.

In the middle of closing the loading platform 3, before the edge of the handle 10 comes into contact with the locking metal fitting 16, a straight line ( 4 and 5), link 11 turns over, i.e.
In the figure, the center of the pin 14 is located on the left side with respect to the above-mentioned line XX, but in FIG. 4, the center of the pin 14 is located on the right side with respect to the line XX, From the position where the center of the pin 14 overlaps on the aforementioned X-X line to the position where the handle 10 abuts the locking metal fitting 16, the locking pawl 5 also rotates clockwise as the handle 10 rotates clockwise. I come to do it.

As a result, when a force is applied to the loading platform 3 in the opening direction when the loading platform 3 is in the closed state shown in FIG. The pawl 5 attempts to rotate clockwise around the shaft 7, but the force is transmitted to the handle 10 via the link 11, causing the handle 10 to rotate clockwise around the support shaft 9. try to make it happen.

However, since the handle 10 comes into contact with the locking metal fitting 16 and is prevented from rotating clockwise, the locking claw 5
can hold the loading platform 3 in a closed state without rotating.

At the same time, the locking pawl 5 is aligned with the upwardly facing recess 6aK of the engaging member 6 fixed to the column 1 [because of this, the loading platform 3 and the runner 2 are lowered relative to the column 1]. Never.

Next, to disengage the locking device, rotate the handle 10 counterclockwise about the support shaft 9 against the elastic force of the torsion coil spring 15, as described above. This can be done by the exact opposite effect to that in the case of engagement.

When the load receiving platform 3 is opened, the handle 10 is moved against the locking metal fitting 1 by the elastic force of the torsion coil springs 8 and 15.
6 and does not protrude from the front of the loading platform 3.

In the above-mentioned embodiment, the two locking claws 5 provided at both ends of the loading platform 3 are configured to be rotated simultaneously by one handle 10, but the - number of locking claws may be configured to be rotated by a single handle, respectively.

Further, in the above-mentioned embodiment, the handle 10 and the locking pawl 5 are connected via the link 11, and are configured to rotate in mutually opposite directions, so that the recessed portion 6a facing upward is formed. By making it possible to engage the locking pawl 5 into the engagement member 6 by rotating the handle 10 downward, the locking device can be easily installed at a high position relative to the road surface. However, the present invention is not limited to this, and the locking claw 5 may be rotated by directly fixing the handle to the locking claw 5 or the shaft rod 7. ○ As described in detail above, the loading platform locking device according to this invention has a locking claw rotatably provided on the loading platform, and a recess into which the locking claw is fitted, facing upward. This hydraulic cylinder device not only reliably holds the loading platform in an upright position when the loading platform is not in use, but also drives the loading platform up and down. Alternatively, it is possible to reliably prevent the runner from descending relative to the column in the event of oil leakage from hydraulic piping or the like, or due to vibrations caused by running the vehicle.

[Brief explanation of drawings]

The drawings show an embodiment of this invention; Fig. 1 is an overall perspective view of a cargo handling lifting device attached to the rear of a cargo box of a pan-type truck; Fig. 2 is a partially cutaway front view of a locking device; FIG. 3 is an enlarged front view of the main part, FIG. 4 is a side view thereof, and FIG. 5 is a side view showing the operating state. 1...Column, 2...Runner, 3...
... Loading platform, 5 ... Locking claw, 6 ...
- Engagement member, 6a... recess, 7... shaft rod.

Claims (1)

[Scope of utility model registration request] In a cargo handling lifting device in which a base end of a load receiving platform is pivotably pivoted to the lower end of a runner that is driven up and down along a pair of columns erected in parallel with each other at a predetermined interval, the load receiving platform includes: A shaft rod having at least one end protruding from the outer end of the loading platform is pivoted approximately horizontally, and a locking pawl is fixed to the outer end of the shaft with a locking claw protruding in the radial direction, and the column is fixed to the locking claw. A locking device for a load receiving platform, characterized in that an engaging member having a recess into which the locking pawl is fitted in correspondence with the locking pawl is fixed with the recess facing upward.