JPH0319455Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a loading/unloading platform roof opening/closing device for a freight vehicle, and is particularly applicable to a loading platform for a freight vehicle, which allows cargo to be loaded and unloaded from both sides of the loading platform, and which also allows loading and unloading from above the loading platform using a crane or the like. Regarding roof opening/closing devices.

Conventionally, as shown in FIG. 1, a structure has been proposed (Utility Model Application Publication No. 17812/1983) in which the roof of the loading platform is openable and closable and is directly driven by a hydraulic cylinder.
In this figure, the loading platform 1 of a truck includes a front frame 2, a rear frame 3, a support member 4 that supports and connects the upper center portions of both, and roofs 5A and 5B that are pivotally connected to the support member 4 so as to be openable and closable. It consists of. Hydraulic cylinders 6A and 6B are directly connected between the front frame 2 and rear frame 3 and the roofs 5A and 5B, respectively, so as to be able to rise and fall freely. Note that 7 is a side gate.
The roofs 5A, 5B are opened and closed using hydraulic cylinders 6A, 6.
This is done by activating B to extend or retract the piston rod.

By the way, with the above configuration, the roofs 5A, 5
The opening/closing angle of B is smaller than 90 degrees, which has the disadvantage of making it difficult to handle cargo from above the loading platform 1 using a crane or the like.

On the other hand, as shown in Fig. 2, there is a sliding covered car with an accordion-type top 11 installed on the loading platform 10 as a structure that allows cargo handling by a crane or the like. There are drawbacks such as being troublesome, and it is still insufficient in terms of improving the efficiency of loading platform work.

In view of the above-mentioned points, the present invention aims to provide a loading/unloading platform roof opening/closing device for a freight vehicle, which allows cargo to be loaded and unloaded from both sides of the loading platform, and which also enables efficient loading and unloading of cargo from above the loading platform using a crane or the like. It is something.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a loading/unloading platform roof opening/closing device for a freight vehicle according to the present invention will be described with reference to the drawings.

FIG. 3 shows a link mechanism and two hydraulic cylinders each used in place of the hydraulic cylinders 6A, 6B that drive the roofs 5A, 5B in FIG. The support member 4 at the center of the upper side of the front frame 2 and rear frame 3
Roof 5A with hinge pin 20 as a fulcrum on both sides of
5B are provided so as to be openable and closable, respectively, and furthermore, a cylinder mounting table 21 is pivotally attached to the hinge pin 20, respectively. A tilt arm bracket 22 is fixed to the inside of the bottom surface of the cylinder mounting table 21, and a substantially triangular tilt arm 23 is rotatably connected to the tilt arm bracket 22 by a hinge pin 24. A roof tilt bracket 25 is fixed to the roofs 5A and 5B, and the roof tilt bracket 25 and the tip of the tilt arm 23 are connected by an adjuster stop rod 26 whose length is freely adjustable. In addition, a cylinder bracket 2 is attached to the bottom end of the cylinder mounting table 21.
7 is fixed to the bracket 27, and a double-acting hydraulic cylinder 28 for tilting is pivotally supported by a hinge pin 29. An adjustment block 30 is screwed onto the tip of the piston rod of the cylinder 28, and is pivotally attached to the top of the tilt arm 23 by a hinge pin 31 passing through a mounting hole of the adjustment block 30. Further, a double-acting hydraulic cylinder 40 for pushing is fixed to the inner bottom surfaces of the upper sides of the front frame 2 and the rear frame 3, and a roller 41 is provided at the tip of the piston rod of the cylinder 40, and a roller 41 is provided at the tip of the piston rod and the cylinder mounting table. A push rod 42 is connected between the lower end of 21. Note that a roller guide 43 for guiding the roller 41 is provided along the bottom surface of the upper side of the front frame 2 and the rear frame 3.

Although not shown in FIG. 3, a similar mechanism is symmetrically provided for the roof 5A.

Furthermore, as shown in Fig. 4, the roofs 5A and 5B are
Operator 5 at the tip to detect 90 degree opening
Limit switches 50 and 51 are provided, for example, at the ends of the support member 4, so that 0A and 51A touch each roof when rotated by 90 degrees.

FIG. 5 shows a partial configuration of an electric circuit using the limit switch. 60 is a power unit consisting of a pump and a motor; 61
An electromagnetic switch 61 receives power from a battery 62 through the electromagnetic switch 61. And key switch 6 for operation
A limit switch 50 is inserted in series with 3. The limit switch 50 is located on the left roof 5.
A is turned off when detecting that the roof 5A is opened more than 90 degrees, and by cutting off the excitation of the electromagnetic switch 61, when the left roof 5A is opened more than 90 degrees, the push cylinder 40 of the roof 5B is activated. The operation of the power unit 60 for the purpose of this operation is stopped. Similarly, roof 5B on the right
When the button is opened, the limit switch 51 is activated to prevent the push cylinder that operates the left roof 5A from operating.

In the above configuration, as shown in FIG. 6, if hydraulic pressure from a power unit provided in a separate system from that for push is supplied to only the double-acting hydraulic cylinder 28 for tilt to cause its piston rod to protrude,
The tilt arm 23 moves in the direction shown by arrow A in FIG. 6 using the hinge pin 24 as a fulcrum, and as a result, the roof 5B is pushed up by the push rod 26, allowing opening and closing operations to be performed within a rotational angle range of 0 degrees to slightly less than 90 degrees. can. Furthermore, when the double-acting hydraulic cylinder 40 for push is operated and its piston rod is protruded, the cylinder mounting base 21 is moved to the arrow B.
As a result, the roof 5B rotates more than 90 degrees to nearly 180 degrees. As shown in FIG. 7, when the roof 5B is fully opened, the upper part of the loading platform is also opened, allowing efficient loading and unloading of long or heavy objects using a crane or the like.

In addition, in FIG. 6, the tilt hydraulic cylinder 28 is operated to rotate the roof 5B within the range of 0 degrees to less than 90 degrees, but conversely, the tilt hydraulic cylinder 28 is not operated and only the push hydraulic cylinder 40 is rotated. Even when activated, the roof 5B can be rotated within a range of 0 to less than 90 degrees.

As explained above, the freight vehicle loading platform roof opening/closing device of the present invention can configure a freight vehicle that has both the characteristics of a box-type vehicle and the versatility of a flat-bottomed vehicle, and allows efficient forklift work from the side of the loading platform. It is possible to carry out the crane operation from above the loading platform efficiently. In addition, if the tilt hydraulic cylinder and the push hydraulic cylinder are operated by separate hydraulic systems, the roof can be opened and closed within the range of 0 degrees to less than 90 degrees even if one of the hydraulic systems fails. . moreover,
It is also easy to configure such a structure that when one roof is rotated by 90 degrees or more, the other roof is automatically restricted to an opening/closing angle of less than 90 degrees.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a conventional truck roof opening/closing device, FIG. 2 is a perspective view showing a sliding covered car, and FIG. 3 is an embodiment of the truck loading platform roof opening/closing device according to the present invention. FIG. 4 is an explanatory diagram showing an example of the mounting position of the limit switch in the embodiment, FIG. 5 is a circuit diagram showing the insertion position of the limit switch, and FIG. Figure 7 is a front view showing a state in which the roof has been rotated within a range of less than ~90 degrees, and Figure 7 is a front view showing a state in which both the tilt and push hydraulic cylinders are activated and the roof has been rotated more than 90 degrees. It is. 1... Loading platform, 2... Front frame, 3... Rear frame, 4
... Support material, 5A, 5B ... Roof, 21 ... Cylinder mounting table, 23 ... Tilt arm, 26 ... Push rod, 28 ... Double-acting hydraulic cylinder for tilt, 40 ... Double-acting hydraulic cylinder for push, 42
...Putshurotsudo, 50,51...Limit switch.

Claims (1)

[Scope of utility model registration request] In the loading/unloading platform roof opening/closing device for a freight vehicle, which uses the upper center of the front frame and the rear frame of the loading platform as an opening/closing fulcrum and has a substantially L-shaped cross section covering the top and side surfaces of the loading platform and opens/closes a bilaterally symmetrical roof. A cylinder mounting table is rotatably attached to the center of the upper side of the rear frame or the rear frame, and a first cylinder is pivotally supported on the cylinder mounting table.
The roof portion located above the cylinder mounting table can be pushed up by a cylinder, and a second cylinder for rotating the cylinder mounting table is attached to the upper side of the front frame or the rear frame,
A loading/unloading platform roof opening/closing device for a freight vehicle, characterized in that the opening/closing angle of the roof is set to be greater than 90 degrees.