JPS6121519Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a forklift car in which the width between forks can be freely varied, and more specifically, a fork moving device that can obtain good visibility in a forklift car having variable width forks. be.

In recent years, forklift trucks have come into frequent use to improve the efficiency of cargo handling operations.

In this lift car, the width between the left and right forks can be changed depending on the size of the load to be handled, and each fork can be moved left and right to move the support point of the load to the left and right in order to balance the load left and right when lifting the load. There is a fork lift car with variable width between sliding forks.

In conventional fork lift cars with variable width between forks, in order to move the left and right forks, hydraulic piping is required for the left and right cylinders, respectively, so there are normally four, but at least three, hydraulic piping from the vehicle body to the lift bracket. was necessary.

By the way, the lift bracket to which the fork is attached moves up and down along the mast, and therefore the hydraulic piping must also be installed along the mast.Since the hydraulic pressure in the piping is high pressure, these hydraulic piping are thick. Not only do they use solid rubber pipes, which complicate inspection and maintenance, but these hydraulic pipings have considerable rigidity and are thick, several centimeters in diameter. There were drawbacks such as worsening the operating efficiency of forklift cars.

The present invention eliminates the above-mentioned drawbacks and reduces the number of hydraulic piping from the vehicle body to the lift bracket to two.Even if the number of piping is reduced to two, it is possible to operate each fork on the left and right at the same time or on the left and right as before. Each fork can be moved left and right separately as follows.

That is, in the present invention, an electromagnetic switching valve is provided in the lift plate, and the electromagnetic switching valve allows one hydraulic pipe to be connected to both the left and right cylinders or separately, and one hydraulic pipe to the electromagnetic switching valve is connected to the left and right cylinders. Two hydraulic pipes are installed along the mast from the lift plate to the vehicle body: one hydraulic pipe is directly connected to the cylinder rooms of the left and right cylinders in the lift plate.

By using the electromagnetic switching valve in this way, the left and right forks can be moved left and right in the same way as in conventional fork-to-fork width variable fork lift cars, and by providing the electromagnetic switching valve inside the lift plate,
The number of hydraulic piping from the lift plate to the vehicle body is 2.
Can be reduced to books.

Hereinafter, embodiments of the present invention will be described using planes.

As shown in FIG. 1, a lift portion such as a lift plate 10 of a fork lift car with variable width between forks according to the present invention includes two L-shaped forks 15,
At 16, a sliding hole 18 is provided at each upper end 17, and the rod-shaped body 14 passing through the hole 18 is fixed to the upper part of the lift plate 10. Furthermore, the left cylinder 2 is located between the left end of the lift plate 11 and the right fork 16.
1, and a right cylinder 25 is provided between the right end 12 of the lift plate and the left fork 15.

Further, as shown in FIGS. 1 and 2, the piping from the front chambers 22, 26 of the left and right cylinders 21, 25 is one in the lift plate 10, and becomes the first hydraulic piping 36, and the piping from the left cylinder rear chamber 23 is connected to the lift plate 10. the third
The pipe 38 goes to the A port of the switching valve 32, and the fourth pipe 39 from the right cylinder rear chamber 27 goes to the B port of the switching valve 32.
A second hydraulic pipe is connected to the P port of the switching valve 32 and pulled out from the P port.

And the chambers 22 of the left and right cylinders 21, 25,
one first hydraulic pipe 36 pulled out from 26;
For example, B of the main valve 31 installed near the driver's cab.
A second hydraulic pipe 37 leading to the port and drawn out from the P port of the electromagnetic switching valve 32 is connected to the A port of the main valve 31.

The switching valve 32 provided on the lift plate is a 4-port, 3-position switching valve, and is preferably of a neutral position tank port (R port) block type electromagnetic operation type.

Note that the shape of the lift plate etc. is not limited to one having through holes in the upper ends 17 of the forks 15 and 16 as shown in FIG.
An enlarged portion 19 may be provided at the upper end of each of the enlarged portions 5 and 16, and a prismatic column 14' may be provided to support the lower portion of the enlarged portion 19.

As described above, in the variable fork width fork lift car in which the left and right forks 15 and 16 are independently slidable left and right, the electromagnetic switching valve 32 is installed in the lift plate 10, and the left and right cylinders 2
4 and 25 cylinder rooms in the same direction (for example, the cylinder rear chambers 23 and 27 of the left and right cylinders),
They are connected to the A and B ports of the switching valve 32 with third and fourth pipes 38 and 39, respectively, and are connected to other cylinder rooms of the left and right cylinders (for example, the cylinder front chambers 22 and 26 of the left and right cylinders). te1
a first hydraulic pipe 36;
and a second hydraulic pipe 37 connected to the P port of the switching valve 32 are pulled out from the lift plate 10, thereby connecting the lift plate 10 and the vehicle body with two hydraulic pipes. It was used as a fork moving device in a forklift car.

Therefore, only two hydraulic pipes, the first and second pipes, are required from the lift plate 10, which is a movable part, to the vehicle body, so the number of thick hydraulic pipes that greatly obstruct visibility can be reduced to two, making it easier to operate the lift car. There are various advantages such as not only improving the forward visibility but also making it easier to maintain and inspect the vehicle. Note that wiring to control the switching valve 32 is required between the lift plate 10 and the driver's seat, but the wiring for remotely controlling the electromagnetic switching valve 32 has a smaller diameter than hydraulic piping and obstructs the view. Needless to say, there is very little risk of interference, and the wiring itself is extremely easy.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a fork lift section according to the present invention, FIG. 2 is a diagram showing a hydraulic circuit of a fork cylinder, and FIG. 3 is a schematic diagram of a lift section showing another embodiment. 10=lift plate, 11=lift plate left side, 12=lift plate right side, 14=bar, 14'=prismatic column, 15=left fork, 16=right fork, 17=top fork, 18=through hole, 1
9=Ampulla, 21=Left cylinder, 22=Left cylinder front chamber, 23=Left cylinder rear chamber, 25=Right cylinder, 26=Right cylinder front chamber, 27=Right cylinder rear chamber, 31=Cylinder, 32=Electromagnetic Switching valve, 36 = first hydraulic pipe, 37 = second hydraulic pipe, 38 = third hydraulic pipe, 39 = fourth hydraulic pipe.

Claims (1)

[Scope of utility model registration request] In a forklift with a variable width between the forks in which a pair of left and right forks can be slid independently from side to side, an electromagnetic switching valve is installed in the lift plate, and the same direction cylinder room, which is the rear chamber of each piston, of the left and right cylinders, for example, is installed in the lift plate. each connected to a different port of the switching valve, and connecting other cylinder rooms in each of the left and right cylinders to form one hydraulic pipe, and the hydraulic pipe and the hydraulic pipe drawn out from the port of the electromagnetic switching valve. A fork movable device having a structure in which two hydraulic pipes are pulled out from a lift plate, and two hydraulic pipes are connected between the lift plate and the main body.