JPH049220Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an elevating device that is attached to the rear or side of a truck body, such as a truck, to facilitate the loading and unloading of cargo by raising and lowering a platform.

(Prior Art and Problems) Conventionally, a lifting device mounted on a freight vehicle has generally had a structure in which a platform is raised and lowered via a parallel link mechanism.

By the way, if the load of cargo on the platform is not large, no special measures are required for the parallel link mechanism, but if the load of cargo on the platform is extremely large, the parallelism of the parallel link mechanism will collapse, and the tip of the platform will In some cases, the inconvenience of lowering the value may occur. This kind of sagging of the tip of the platform is dangerous as it may cause the load to collapse or become loose.

(Means for Solving the Problems) In view of the above points, the present invention is capable of reliably preventing the tip of the platform from lowering when the load on the platform is large when the platform is raised and lowered by a parallel link mechanism. The purpose of this invention is to provide a lifting device that has a simple structure and is easy to manufacture.

The present invention includes a fixed support member fixed to the rear or side part of a vehicle body, a rotating shaft rotatably supported by the fixed supporting member, a cylinder for driving the rotating shaft, and both sides of the rotating shaft. A rotating member fixed to the rotating member, a main arm having one end pivoted to the rotating member and rotating integrally with the rotating member in the upward direction, and forming a parallel link for lifting and lowering together with the main arm. a sub-arm having one end pivoted to the fixed support member side; a vertical link having the other end of the main arm pivoted to its upper end and the other end of the sub-arm pivoted to its lower end; and an upper end of the vertical link. a platform that is pivotally connected with the main arm to the vertical link and maintains a horizontal state by contacting the vertical link; and a platform that can come into contact with the upper surface of the main arm when the tip of the main arm is in a raised position and is pivoted on the fixed support member side. The above-mentioned problems of the prior art are solved by the configuration including the roller.

(Function) In the lifting device of the present invention, the attachment base of the main arm, which forms one link of the parallel link, to the rotating member has an arcuate upper surface, and when the tip of the main arm is in the raised position, it is fixedly supported. It can come into contact with a roller supported on the member side. Therefore, the roller can reliably prevent the main arm from lifting off from the rotating member. Further, when the main arm is in the lowered position, the roller and the main arm are separated, and the platform can be tilted to allow the tip of the platform to land on the ground.

(Example) Hereinafter, an example of the elevating device according to the present invention will be described with reference to the drawings.

1 to 6, the lifting device is attached to the rear or side part of the vehicle body 1 of a freight vehicle, and as shown in FIG. 2, a round pipe 3 that is fixed to the vehicle chassis 2 and serves as a bearing. A fixed support member 4 having a fixed support member 4, a rotary shaft 5 that passes through the round pipe 3 of the fixed support member 4 and is rotatably supported, a hydraulic cylinder 6 that drives the rotary shaft 5, and a hydraulic cylinder 6 for driving the rotary shaft 5. It includes a rotating member 7 fixed to both sides, and a main arm 8 and a sub-arm 9 forming a parallel link mechanism for lifting and lowering.

As can be seen from FIGS. 2 and 3, the main body side of the hydraulic cylinder 6 is pivotally connected to a cylinder arm 10 fixed to the rotating shaft 5 with a pin 11. Further, a lower round pipe 13 is fixed in parallel to the fixed round pipe 3 via a connecting plate 12, and a pin 15 is attached to a bracket 14 fixed to the lower round pipe 13.
The tip of the piston rod of the cylinder 6 is pivotally connected through the piston rod. Therefore, when the piston rod of the cylinder 6 extends, the cylinder arm 10 rotates counterclockwise in FIG. 3 and the like. That is, the rotating shaft 5 rotates to the left in FIG. 3 and the like.

One end of the main arm 8 is pivotally connected to the rotating member 7 with a pin 20, and as shown in FIGS. The positional relationship between the rotary member 7 and the rotating member 7 can be adjusted. When the rotating member 7 attempts to rotate counterclockwise due to the left rotation of the rotating shaft 5, the stopper bolt 21 comes into contact with the main arm 8, and the main arm 8 rotates together with the rotating member 7. Raise the tip.

A bracket 51 is fixed to the fixed round pipe 3, and a roller 52 is pivotally supported on the bracket 51. When the tip of the main arm 8 is raised to some extent, the roller 52 comes into contact with the arcuate upper surface U of the attachment base of the main arm 8 to the rotating member 7, as shown in FIG. This is to prevent the arm 8 from lifting up.

As shown in FIGS. 1, 2 and 6, one end of the sub-arm 9, which forms a parallel link for lifting with the main arm 8, is pinned to a bracket 25 fixed to the round pipe 3 of the fixed support member 4. It is pivoted at 26.

The other ends, ie, the tips, of the main arm 8 and the sub-arm 9 are pivotally connected to a vertical link body 30, respectively.

Here, the vertical link body 30, as shown in FIG. Rear bracket 3 of platform 40
It is pivotally connected to 3A to 33D.

At this time, the tip of the main arm 8 is pivotally attached to the upper end of the main arm side link portion 30A, and a balance spring 34 is provided around the pin 31 between the brackets 33C and 33D. Here, the balance spring 34 is a torsion spring that biases the main platform 40 in the direction of standing up (however, it is not strong enough to actually make it stand up; Subplatform 4 connected to this
This is to reduce the operating force required when folding and standing up 1 and 2. ).

Further, the tip of the sub-arm 9 is pivotally attached to the lower end of the sub-arm side link portion 30B with a pin 35,
The pin 35 is further connected to the main arm side link portion 30A.
It passes through the underside of and is pivotally attached to it. Therefore, both link parts 30A and 30B move together.

The main platform 40 is configured such that its rear end abuts against such a vertical link body 30 to maintain a horizontal state.

A sub-platform 41 is foldably connected to the main platform 40 via a double hinge 42, as shown in FIGS. 3 and 4.
As shown in the figure, contact blocks 46 and 47 are fixed to the lower portions of both platforms 40 and 41, respectively, so that they form a single horizontal plate when extended.

Next, the operation of the lifting device shown in the embodiment will be explained.

In the lifting operation from the height where the main platform 40 and the sub-platform 41 are aligned with the floor surface of the vehicle body 1 in FIG. 3 until the lower end of the vertical link body 30 in FIG. 4 lands, the main platform arm The rotation center P of 8, the pivot point Q at the tip of main arm 8, the pivot point R at the tip of sub arm 9, and the rotation center S of sub arm 9 form a parallelogram, and one half QR is placed on the vertical line. If this is done, by extending or retracting the hydraulic cylinder 6, the main platform 40 and sub-arm 41 will rise or fall while maintaining their horizontal state. At this time, when the tips of the main arm 8, that is, the main platform 40 and the sub-platform 41 are raised to some extent, the roller 52 comes into contact with the arcuate upper surface U of the main arm base as shown in FIG. Even when the load of cargo on both platforms 40, 41 is extremely large (near the rated load), the main arm 8 does not rise, and the inconvenience of the platform being tilted and the tip lowering does not occur.

Further, from the state shown in FIG. 4, the hydraulic cylinder 6
If the rotation member 7 is retracted, the rotation member 7 rotates clockwise, but the main arm 8 cannot rotate together with the rotation member 7, and as shown in FIG. The main arm 8 rises from the stopper bolt 21 on the side, and the side PQ becomes longer. At that time, the roller 52 and the upper surface of the main arm 8 are separated, the upper side of the main arm 8 is in an open state, and the main arm 8 is in an open state.
It does not become an obstacle to the lifting of the surface. As a result, the vertical link body 30 can be tilted, and the tip of the sub-platform 41 will land on the ground.

Therefore, in the state shown in Fig. 5, cargo can be loaded and unloaded onto both platforms 40, 41 using a trolley etc. very easily, and the cargo on the platform can be unloaded onto the floor of the car body using both platforms 40 and 41 as shown in Fig. 4. After the platforms 40, 41 are leveled, the operation is carried out as shown in FIG.

To store the main platform 40 and sub-platform 41, first fold the sub-platform 41 onto the main platform 40 side with the main arm 8 and sub-arm 9 lowered as shown in Figures 1 and 2. , by leaning against the storage guide 50 fixed to the fixed side round pipe 3, and then extending the cylinder 6 to lift the tips of the main arm 8 and sub-arm 9 as shown in FIG. . This allows each platform 4
0 and 41 are stored under the floor of the vehicle body 1 so as not to get in the way.

In the above embodiment, the platform is folded and stored under the floor, but the present invention can also be applied to a single platform structure which also serves as a vehicle gate plate.

(Effects of the invention) As explained above, according to the elevating device of the invention, there is a fixed support member fixed to the rear or side part of the vehicle body, and a rotating shaft rotatably supported by the fixed support member. and a cylinder that drives the rotating shaft.
a rotating member fixed to both sides of the rotating shaft; a main arm having one end pivoted to the rotating member and rotating integrally with the rotating member in the upward direction; and a main arm for lifting and lowering together with the main arm. a sub-arm forming a parallel link, one end of which is pivotally connected to the fixed support member side, and the other end of the main arm at the upper end,
a vertical link to the lower end of which the other end of the sub-arm is pivotally connected, and a platform which is pivotally connected to the upper end of the vertical link together with the main arm and abuts against the vertical link to maintain a horizontal state;
Since the structure includes a roller that can come into contact with the upper surface of the main arm in the raised position of the tip of the main arm and is pivotally supported on the fixed support member side, even when the load on the platform is large, the roller can be moved in the raised position. This prevents the tip of the platform from falling, allowing for highly safe and reliable cargo handling operations. Moreover, the mechanism is simple and manufacturing is easy.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of the lifting device according to the present invention, with the main platform and sub-platform folded up and leaning against each other, Fig. 2 is a front view of the same, and Fig. 3 is a main platform. Figure 4 is a side view when the platform and subplatform are in the raised position; Figure 4 is a side view when the platform and subplatform are in the lowered position;
The figure is a side view when the tip of the sub-platform is in a landing state, and FIG. 6 is a side view when the main platform and sub-platform are folded and stored. DESCRIPTION OF SYMBOLS 1... Vehicle body, 3... Round pipe, 4... Fixed support member, 5... Rotating shaft, 6... Hydraulic cylinder, 7...
...Rotating member, 8...Main arm, 9...Sub arm, 10...Cylinder arm, 30...Vertical link body, 40...Main platform, 41
...Subplatform, 42...Hinge, 52...
…roller.

Claims (1)

[Scope of utility model registration request] A fixed support member fixed to the rear or side part of the vehicle body, a rotating shaft rotatably supported by the fixed supporting member, a cylinder that drives the rotating shaft, and a cylinder fixed to both sides of the rotating shaft. A rotating member, a main arm whose one end is pivotally connected to the rotating member and which rotates together with the rotating member in the upward direction, and which together with the main arm forms a parallel link for lifting; a sub-arm which is pivotally attached to the fixed support member side, a vertical link to which the other end of the main arm is pivoted to its upper end and the other end of the sub-arm to its lower end, and the main arm is attached to the upper end of the vertical link. a platform that is pivotally connected to the vertical link and maintains a horizontal state by contacting the vertical link; and a roller that is pivotable to the fixed support member and that can come into contact with the upper surface of the main arm when the tip of the main arm is in a raised position. A lifting device characterized by comprising: