JPS6030313Y2 - Piping structure of push-pull device - Google Patents

Description

[Detailed explanation of the invention] Various attachments for forklifts have a link mechanism such as a push-pull device and a device that uses hydraulic pressure at the tip. Conventionally, the links have a triple structure due to the piping that runs along the links. It had become.

To explain a forklift equipped with a conventional push-pull device using Fig. 1, 1 is a forklift, 2 is
is a mast, and 3 is a push-pull device.

This push-pull device 3 is composed of a frame 4 attached to a mast 2, a face plate 5, a link 6, and a platen 7.

The frame 4 and the face plate 5 are connected by a link 6, and the face plate 5 is moved back and forth by the operation of a hydraulic cylinder (not shown).

A sheet pallet loading device 8 is provided at the bottom of the face plate 5;
A face plate 5 that moves back and forth is disposed between the valve and a sequence valve (not shown in FIG. 1) fixed on the poom 4.
Hydraulic piping is required to absorb the amount of movement (the amount of expansion and contraction of the link 6).

Fig. 2 is a perspective view of one side of the link showing the hydraulic piping part in the push-pull device 3 of Fig. 1, and Fig. 3 is a perspective view of A of Fig. 2.
It is an arrow view.

In FIGS. 2 and 3, oil that has passed through an operation valve (not shown) passes through a sequence valve 9, flows to a rubber hose 11 via a steel pipe 10 fixed to the frame 4, and is further fixed to a link 6a. The flow flows into the steel pipe 12, and then through the rubber hose 13, which bends as the face plate 5 moves, into the steel pipe 14 fixed to the link 6b, and then onto the sheet pallet (not shown in FIGS. 2 and 3). It is led to a hydraulic cylinder 15 which activates the clamping device.

However, the hydraulic piping structure shown in FIGS. 2 and 3 has the following drawbacks.

That is, the steel pipes 12 and 1 are connected to the links 6a and 6b.
4 is directly fixed, the link mechanism becomes a triple structure as shown in FIG. (face plate 5 is fully retracted), it becomes very small.
There was a problem with the durability of the rubber hose.

The present invention was proposed in order to eliminate the above-mentioned disadvantages of the conventional method, and it simplifies the link structure by eliminating the conventional piping along the link, and also provides a clamp device to prevent bending of the rubber hose. It is an object of the present invention to provide a piping structure for a push-pull device that can improve durability.

An embodiment of the present invention will be described below with reference to the drawings. In Figs. 4 and 5, 16 is a push-pull device showing an embodiment of the present invention, and 17 is a frame attached to a forklift mast (not shown). , 18 is a face plate, and the same frame 17 and face plate 18 are link 1
9, and the face plate 18 can be moved back and forth by the operation of a hydraulic cylinder (not shown).

Further, a sheet pallet insertion device 20 is provided below the face plate 18.

The sheet pallet clamping device 20 includes a hydraulic cylinder 21
, an arm 22, a gripper jaw 23, a pad 24, etc. The arm 22 and gripper jaw 23 are fixedly attached to a shaft 25, rotate together by the action of a hydraulic cylinder 21, and are fixed to the lower part of the face plate 18. The sheet pallet 26 is held between the pad 24 and the gripper jaws 23.

The present invention includes a sheet pallet insertion device 20 disposed at the bottom of a face plate 18 that moves forward and backward, and a frame 1.
The structure of the hydraulic piping between the sequence valves 27 fixed to the upper part of the valves 7 is a feature.

Now, a sequence valve 27 connected to an operation valve (not shown)
A pipe 28 is connected to the frame 17, and the pipe 28 is fixed to the frame 17 and a rubber hose 29 is connected thereto.

Further, clamp devices 31a, 31a are attached to a cross member 30a that connects the left and right links 19, 19.

The clamp device 31a is attached to a bracket 32 as shown in FIG.
, an arm 33 and a bolt 34, and a pin 35.
The cross member 30a is swingably attached to the cross member 30a.

A pipe 36 is attached between the clamp devices 31at31a, and one end of the pipe 36 is connected to the rubber hose 29, and the other end is connected to a rubber hose 37.

On the other hand, a clamp device 31 is attached to another cross member 30b.
b, 31b are swingably attached, and a pipe 38 is attached between the clamp devices 31b, 31b.

The rubber hose 37 is connected to one end of the pipe 38, and the rubber hose 39 is connected to the other end.

The other end of the rubber hose 39 is connected to the face plate 1.
A pipe 41 fixed to the face plate 18 is connected to the distribution connector 40 attached to the face plate 18.
is connected.

A rubber hose 42 is connected to the pipe 41, and the rubber hose 42 is connected to the hydraulic cylinder 21.

In this way, the sequence valve 27 and the hydraulic cylinder 2
1 is connected with hydraulic piping, and rubber hose 29.37.3
One end or both ends of 9 are swingably connected to a cross member 30a.
, 30b by means of clamping devices 31a, 31b attached to pipes 36,38.

Therefore, when the link 19 expands and contracts to move the face plate 18 back and forth, the clamp devices 31a+31b swing, so that the unreasonable load applied when the rubber hose bends can be absorbed.

Note that the lengths of the pipes 36, 3 and 8 may be short, and only one clamping device for each cross member may be used.

As explained in detail above, the present invention includes attaching a swingable ramp device to a cross member connecting links of a push-pull device, having the clamp device support a pipe member along the cross member, and supporting the pipe member and the sheet. Since the hydraulic cylinder for the pallet loading device and the sequence valve are connected with a flexible rubber hose, there is no possibility that excessive force will be applied to the rubber hose, unlike the conventional case where the piping along the link is connected with a rubber hose. The durability of the rubber hose can be improved.

In addition, the pipe member is placed along the cross member that connects the links, and the piping is not placed along the link as in the past.
The link may have a double structure instead of the conventional triple structure, and the link mechanism can be simplified.

The present invention can be applied to a push-pull device for a forklift, various attachments for a forklift that have a link mechanism, and a device that utilizes hydraulic pressure at the tip.

[Brief explanation of the drawing]

Fig. 1 is a side view of a forklift truck equipped with a conventional push-pull device, Fig. 2 is a perspective view showing only one side of the piping structure of the push-pull device shown in Fig. 1, and Fig. 3 is a side view of a forklift truck equipped with a conventional push-pull device.
4 is a plan view of the piping structure of a push-pull device showing an embodiment of the present invention, FIG. 5 is a view taken along line B-B in FIG. 4, and FIG. C is an enlarged sectional view. Explanation of main parts of the figure, 16...Push-pull device, 17...Frame, 18...Curved face plate, 19...Link, 20... Sheet pallet clamping device, 21...Hydraulic cylinder, 27/curve/sequence valve, 28.36.38
．． 41...Pipe (pipe member), 29.37,3
9.42...com hose, 30at30b...
...Cross member, 31ay31b...
clamping device.

Claims (1)

[Scope of utility model registration request] In the piping structure that connects the hydraulic cylinder for the sheet pallet insertion device installed at the bottom of the face plate of the push-pull device that moves forward and backward, and the sequence valve fixed to the frame, the link of the push-pull device is Attach a swingable lamp device to the connecting cross member,
A piping structure for a push-pull device, characterized in that the clamp device supports a pipe member along the cross member, and the pipe member, the hydraulic cylinder, and the sequence valve are connected by flexible rubber hoses. .