JP2623041B2 - Mast device for cargo handling vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mast device mounted on a cargo handling vehicle such as a forklift truck.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional mast device for a cargo-handling vehicle is provided so that outer masts 1 having a U-shaped cross section are opposed to each other, and inside the pair of outer masts 1 along the outer masts 1. A pair of inner masts 2 having a U-shaped cross section are provided to move up and down, and the inner mast 2 is moved up and down by a lift cylinder 7. The inner mast 2 has a lift 3
Are provided so as to be vertically movable. In this elevating body 3, finger bars 9 are fixed to a pair of vertical members 8 which move up and down inside the inner mast 2 via rollers, and a finger bar 9 is attached to the upper and lower two stages, and a fork 10 is mounted on the finger bar 9. . A chain 5 is mounted on the elevating body 3, and one end of the chain 5 is fixed to a rear part of the vertical member 8 of the elevating body 3, and is attached to a rear part of an upper part of the inner mast 2 therefrom. The other end is fixed to the upper part of the outer mast 1 by being suspended from the pulley 6. With this configuration, when the lift cylinder 7 is operated to move the elevating body 3 up and down, and the inner mast 2 is moved up and down, the chain 5 interlocks with the up and down movement of the inner mast 2, and
The lifting / lowering body 3 fixed to one end of the body is moved up and down.

[0003]

In the conventional mast device, a chain for moving the elevating body up and down is provided to be exposed behind a portion where the outer mast and the inner mast are provided together. For this reason, there is a danger that an object may be caught on the chain or a limb may come into contact with the chain, and lubricating oil adhering to the chain may be scattered to contaminate the surroundings. An object of the present invention is to solve these problems.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a mast device for a cargo handling vehicle, wherein a pulley for hanging a chain is axially mounted on an inner side surface of the outer mast and above an outer side surface of the inner mast, and the chain is connected to the outer mast. The arrangement between the inner mast and the inner mast minimizes the exposure of the chain.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a mast device for a cargo handling vehicle according to the present invention will be described with reference to FIGS. In a structure in which a pair of U-shaped inner masts 2 that move up and down along a pair of U-shaped cross-section outer masts 1 and a lifting body 3 are provided to be vertically movable, an L-shaped section 4 is provided behind the lifting body 3. The L-shaped member 4 is inserted between the outer mast 1 and the inner mast 2 so that the bent end portion is located inside the U-shaped outer mast 1.
Then, one end of the chain 5 is fixed to the tip end, and the chain 5 is axially mounted on the outer side of the inner mast 2 and hung on a pulley 6 located inside the U-shaped outer mast 1. Further, the other end is fixed to the upper inside of the outer mast 1.

In the engaging portion between the outer mast 1 and the inner mast 2, two mast rollers 12 are provided above the inner side surface of the outer mast 1, and a rail which contacts the mast roller 12 on the outer side surface of the inner mast 2. Part 1
1 is provided so as to protrude in the vertical direction.

With this configuration, the lift cylinder 7 operates to move the elevating body 3 up and down, and the rail portion 11 moves while abutting on the mast roller 12, thereby moving the inner mast 2 along the outer mast 1. When the chain 5 is moved up and down, the chain 5 interlocks with the elevating and lowering of the inner mast 2, so that the elevating body 3 fixed to one end of the chain 5 moves up and down. By being located inside the outer mast 1, that is, between the outer mast 1 and the inner mast 2,
It is possible to prevent a danger that an object is caught on the chain 5 or a limb comes into contact with the chain.

In the embodiment, the outer mast 1
Although the U-shaped cross section is used for the inner mast 2 and the inner mast 2, the present invention is not limited to this and can be used for an I-shaped cross section, a J-shaped cross section, and an H-shaped cross section.

[0009]

According to the present invention, in a mast device for a cargo handling vehicle, a mast roller is provided above an inner side surface of an outer mast.
And a plurality of rails are provided on the outer side surface of the inner mast so as to protrude in the vertical direction, and a pulley for hanging the chain is provided on the inner side surface of the outer mast. The shaft is mounted on the upper side and the chain is placed between the outer mast and the inner mast, reducing the exposure of the chain as much as possible, preventing the danger of things getting caught in the chain and limbs contacting In addition to this, it is possible to prevent the lubricating oil adhering to the chain from scattering and polluting the surroundings. In addition, since the chain is located between the outer mast and the inner mast, it is possible to prevent the visibility of the chain from being hindered during driving, and to provide an effect of improving visibility. Can be Furthermore, in the present invention, since what is arranged between the outer mast and the inner mast is the mast roller and the chain, the dimension of the space formed between the outer mast and the inner mast is It is sufficient that the mast device is slightly larger than the width of the mast device, and it is possible to provide a compact mast device, and both the outer mast and the inner mast can have a simple structure. Can be assembled.

[Brief description of the drawings]

FIG. 1 is a side view of a mast device of a cargo handling vehicle according to an embodiment of the present invention.

FIG. 2A is a sectional view taken along line AA of FIG. (B) BB sectional drawing of FIG. (C) CC sectional drawing of FIG.

FIG. 3 is a schematic perspective view of FIG. 1;

FIG. 4 is a schematic perspective view of a conventional mast device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outer mast, 2 ... Inner mast, 3 ... Elevating body, 4 ... L-shaped member, 5 ... Chain, 6 ... Pulley, 7 ... Lift cylinder, 8 ... Vertical member, 9 ... Finger bar, 1
0: Fork, 11: Rail, 12: Mast roller.

Claims (1)

(57) [Claims] 1. A pair of left and right outer masts 1 standing upright in front of a vehicle body, a pair of left and right inner masts 2 moving up and down along the inner side of the outer masts 1, and a vertically movable unit provided on the inner masts 2. Body 3 and inner mast 2
Is hung on a pulley 6 which is attached to the upper part of the
A chain 5 having the other end fixed to the outer mast 1
A mast device for a cargo handling vehicle, comprising: a mast roller 1 disposed above an inner side surface of the outer mast 1
One or a plurality of the inner masts 2 are provided, and a rail portion 11 is provided on the outer side surface of the inner mast 2 so as to protrude vertically, and the pulley 6 is provided on the inner side surface of the outer mast 1 by the inner side surface. A mast device for a cargo handling vehicle, wherein the mast device is mounted on an outer side surface of the mast 2 and the chain 5 is disposed between the outer mast 1 and the inner mast 2.