JPS602155Y2 - Lift chain jamming prevention device for forklift trucks - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lift chain jamming prevention device for a forklift truck. Specifically, when slack occurs at the lower end of the lift chain connected to the lift bracket side, the slack is absorbed by the inner mast. This invention relates to a device that prevents a lower tie beam from getting caught.

In general, in a forklift truck in which two lift cylinders for raising and lowering the lift bracket are arranged separately on the left and right sides of the vehicle body, the lift cylinders are guided in sliding by an outer mast that is installed vertically at the front of the vehicle body so that it can tilt forward and backward. The piston rods are disposed substantially rearward of the inner masts, and their piston rod tips are connected to the inner masts.

Further, a lift chain hung on a guide pulley pivoted inside the upper end of the inner mast, which is moved up and down by the operation of the lift cylinder, has one end attached to the upper part of the lift cylinder and the other end attached to the lift bracket. The lower tie beam moves the front part of the lower tie beam which connects the left and right rear parts of the inner mast.

However, in the forklift truck configured as described above, when a loaded pallet is placed on a shelf having a predetermined height by the fork attached to the lift bracket, the pallet is not placed on the shelf. However, if the lowering operation of the lift cylinder continues, the lift chain becomes slack, and the lower tie beam of the inner mast gets caught in the slack, causing a problem.

When such a trouble occurs, not only the chain is damaged, but also the anchor bolt may be deformed because the chain is pulled behind the inner mast.

The present invention aims to solve the above problem.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In the figure, reference numeral 1 denotes an outer mast that is erected at the front of a vehicle body (not shown) so as to be tiltable forward and backward.

2 is an inner mast whose sliding movement is guided by the outer mast 1 via a mast roller 3, and has an upper tie beam 2a on its upper back surface, a lower tie beam 2b on its lower back surface,
2c is fixed.

Reference numeral 4 denotes lift cylinders, two on the left and right, which are disposed approximately at the rear of the inner mast 2, and are erected on the lower end cross beam 1a of the outer mast 1, and the tip of the piston rod 4a is fixed to the upper end of the inner mast 2. ing.

A lift chain 5 is hung around a guide pulley 6 that is pivotally supported inside the upper end of the inner mast 2. One end of the chain 5 is anchored to the upper part of the lift cylinder 4, and the other end is anchored to the back of the side plate 7a of the lift bracket 7. They are connected via bolts 8.

The lift bracket 7 moves up and down while being slidably guided by the inner mast 2, which moves up and down by the operation of the lift cylinder 4, via lift rollers 7b.

9 is a fork attached to the lift bracket 7.

The above configuration is the same as the conventional device, but the present invention has a third
As shown in the figure, the regulating plate 10 extends from the lower end of the lower tie beams 2b, 2c connected to the inner mast 2 to the anchor bolt 8 portion for the lift chain 5 when the lift bracket 7 is at its lowest position. lift chain 5
It is distinctive in that it is disposed on the inner mast 2 opposite to the back of the inner mast 2.

According to the device of the present invention having the above configuration, even if the lift cylinder continues to be lowered after the pallet on the fork is placed on the shelf during cargo handling work, the slack in the chain caused by the lowering of the inner mast can be reduced. is prevented from protruding rearward from below the lower tie beam of the inner mast due to the regulating plate, and the slack is refracted to the front part of the lower tie beam, so it does not interfere with the lifting and lowering movements of the lift bracket and inner mast, and the lift chain This has the excellent effect of improving cargo handling efficiency without damaging anchor bolts, etc.

In addition, although the inner mast 2 provided with the several lower tie beam 2bv2c was shown in the Example, it is also possible to apply to the inner mast provided with only one lower tie beam.

[Brief explanation of drawings]

The figure shows an embodiment of the invention. FIG. 1 is a partially sectional side view showing the main part, FIG. 2 is a partially sectional plan view, and FIG. 3 is a perspective view of the main part. 1...Outer mast, 2...Inner mast, 2b, 2c...Lower tie beam, 4...
...Lift cylinder, 5...Lift chain, 7...Lift bracket, 7a...
・Lift bracket side plate, 10...Regulation plate.

Claims (1)

[Scope of utility model registration request] A lift chain connected to the lift bracket is arranged at the front part of the lower tie beam of the inner mast, whose sliding movement is guided by the outer mast which is erected on the front part of the vehicle body so as to be tiltable forward and backward, and which guides the vertical movement of the lift bracket. In the forklift truck, from the lower end of the tie beam, at least when the lift bracket is lowest,
A lift chain jamming prevention device for a forklift truck, characterized in that a regulating plate extending up to the chain connection end of the lift bracket is disposed opposite to the back of the lift chain.