JPH05319792A - Chain protector for fork-lift - Google Patents

Abstract

PURPOSE:To increase a visual field in front of a driver's seat and in the lateral direction thereof. CONSTITUTION:Chain wheels 4 are rotatably supported inside an inner mast 1. A lift chain 5 is run around the chain wheel 4. A hose 6 is disposed in parallel to the lift chain 5 internally of the mast of the lift chain 5. The hose 6 is run around a hose pulley 7. The hose pulley 7 is rotatably supported from the inner side of the mast. The pulley shaft 8 intercouples a pulley bracket 10 and a chain protector 11. The pulley bracket 10 is fixed to an upper tie beam 2. The chain protector 11 is fixed to the pulley bracket 10 through the pulley shaft 8, and a horizontal part 11b is extended through a position below the hose pulley 7 to a position below the chain wheel 4 and arranged in the vicinity of the chain wheel 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a hose arranged inside a mast alongside a lift chain for an attachment mounted for efficiently performing various cargo handling operations other than fork work. Involved in a forklift,
Particularly, it relates to a chain protector for protecting a mast chain wheel.

[0002]

2. Description of the Related Art In a forklift, when an attachment such as a rotary clamp is attached to a mast, for example, Japanese Utility Model Laid-Open No. 61-168097 and Japanese Utility Model Laid-Open No.
As described in JP-A-3-88698, a hose for connecting between a drive device (hydraulic cylinder or hydraulic motor) for an attachment and a hydraulic control unit on the vehicle body is provided inside the inner mast with a lift chain. It is usually installed side by side.

That is, as shown in FIG. 3, a chain wheel 4 is rotatably attached to a chain wheel shaft 3 attached to the upper parts of the left and right inner masts 1 which are lifted and lowered by a lift cylinder (not shown), and the chain thereof is attached. A lift chain 5 is hung on the wheel 4. In addition, the upper portion of the pulley bracket 10 is fixed to the upper tie beam 2 which is horizontally provided between the upper ends of the left and right inner masts 1, and the hose pulley 7 is rotatably supported by the pulley shaft 8 fixed to the pulley bracket 10. ing. A hose 6 is mounted on the hose pulley 7, and the hose 6 is arranged along the inner mast 1 so as to be aligned with the lift chain 5.

Further, a vertically elongated plate-like chain protector 11 is bolted to the upper tie beam 2 at its upper portion. The chain protector 11 extends downward between the chain wheel 4 and the hose pulley 7,
The lower part is bent at a right angle and is arranged in close proximity to the chain wheel 4 so as to face the chain wheel 4 from below. Therefore, the chain protector 11 prevents foreign matter attached to the lift chain 5 between the lift chain 5 and the chain wheel 4. It is prevented from being caught.

Reference numeral 9b is a restriction rod, which is fixed to the pulley bracket 10 via a restriction plate 9 to allow the hose pulley 7 to move.
The hose 6 is regulated so as not to come off due to vibration or the like.

[0006]

However, in the arrangement of the chain protector as described above, since the chain protector 11 is interposed between the hose pulley 7 and the chain wheel 4, the chain protector 11 is directed in the left-right direction, that is, inward of the mast. The side of the chain wheel 4 and the chain protector 1
It is necessary to secure clearances at predetermined intervals so that the chain protector 11 and the hose pulley 7 do not come into contact with each other. For this reason, the hose 6 is arranged close to the inside of the mast to secure the two clearances, and the view from the driver's seat in the front left and right directions is hose 6.
There is a problem of being narrowed down by.

The present invention has been made in view of the above problems, and an object thereof is to widen the field of view from the driver's seat in the front left and right directions.

[0008]

In order to achieve the above object, in a chain protector for a forklift according to the present invention, a lift chain and a hose are arranged side by side inside the mast in order from the outside.
In a forklift mounted on a chain wheel and a hose pulley arranged side by side inside the upper part of the mast, support the chain protector inside the mast rather than the hose pulley, and place the chain protector below the hose pulley and below the chain wheel. It is characterized by having been set up.

[0009]

[Operation] Since the chain protector is not arranged between the hose pulley and the chain wheel, the left-right clearance between the hose pulley and the chain wheel is smaller than before, and the hose pulley is moved closer to the mast side (outer side) than before. Can be placed. Therefore, the hose hooked on the hose pulley is also closer to the mast side, and the field of view in the front left and right directions from the driver's seat of the forklift is widened.

Further, since the chain protector of the present invention not only faces the tune wheel from the lower side but also the hose pulley from the lower side, foreign matter adhering to the chain between the chain wheel and the chain is prevented. Prevents pinching, and also prevents foreign substances adhering to the hose between the hose pulley and the hose.

[0011]

Embodiments of the present invention will be described with reference to the drawings.
First, the structure will be described. Outer masts are installed upright on the front side of the forklift truck body. An inner mast is arranged inside the outer mast, and a lift cylinder is erected on the rear side of the inner mast, and the inner mast can be moved up and down along the outer mast by expansion and contraction of the cylinder rod of the lift cylinder. There is. An upper tie beam 2 is horizontally installed between the upper ends of the left and right inner masts 1.

Further, as shown in FIG. 1, chain wheel shafts 3 are respectively provided on the inner surfaces of the upper parts of the left and right inner masts 1 so as to project laterally, and the chain wheels 4 are rotatable on the chain wheel shafts 3. Supported by. A lift chain 5 is hung on the chain wheel 4. The lift chain 5 is arranged along the inner side of the inner mast 1 and has one end (front side) connected to a lift bracket that moves up and down along the inner mast 1 and the other end (rear side) connected to a lift cylinder. ing.

Further, inside the lift chain 5, two hoses 6 are arranged in parallel with the lift chain 5. The hose 6 is mounted on a hose pulley 7. The hose pulley 7 is disposed on the side of the chain wheel 4 with a predetermined clearance, and is rotatably supported by a pulley shaft 8 having its shaft oriented to the left and right from the inside of the mast.

As shown in FIG. 2, the pulley shaft 8 has a shaft 8a rotatably supporting the center of rotation of the hose pulley 7 on one end side extending toward the inner mast 1 side and an outer peripheral surface on the other end side extending inside the mast. A male screw is formed on the to form the bolt 8b. The bolt 8b is provided with the regulation plate 9, the pulley bracket 10, and the chain protector 1.
1 penetrates through the through holes 9a and 10a respectively provided and the nut 12 is screwed into the tip of the through holes 9a and 10a, so that the regulating plate 9, the pulley bracket 10, and the chain protector 11 are integrally attached to the pulley shaft 8. It is fixed.

The regulating plate 9 has two regulating rods 9b projecting from the upper portion thereof toward the inner mast 1 side, that is, the pulley 7 side. The restriction rod 9b faces the hose pulley 7 from above with a predetermined space therebetween, and thus prevents the hose 6 hooked on the hose pulley 7 from falling off the hose pulley 7. The pulley bracket 10 is formed into a substantially hook shape by vertically bending the upper end of a vertically elongated flat plate, and the upper end 10b is fixed to the upper tie beam 2 by a bolt or the like. Rotatably supports the hose pulley 7.

Further, the chain protector 11 is formed in an L shape in which the middle portion of a vertically elongated flat plate is bent at a right angle, and the vertical portion 11a is fixed to the pulley bracket 10 via the pulley shaft 8. A horizontal portion 11b extends below the hose pulley 7 to below the chain wheel 4 and is provided near the lower side of the chain wheel 4.

In the mast structure of the forklift having the above-described structure, the left and right inner masts 1 are raised by driving a lift cylinder (not shown), and the chain wheel 4 and the hose pulley 7 follow the rise of the inner mast 1.
Also rises. When the chain wheel 4 moves up, the front portion of the lift chain 5 moves upward and moves rearward via the chain wheel 4, thereby moving the connected lift brackets upward. At this time, even if foreign matter attached to the chain moves together with the ascending chain 5, the foreign matter hits the horizontal portion 11b of the chain protector 11 located below the chain wheel 4 before coming into contact with the chain wheel 4, Foreign matter is prevented from being caught between the wheel 4 and the lift chain 5.

Further, in this embodiment, since the horizontal portion of the chain protector 11 is also provided under the hose pulley 7, foreign matter is sandwiched between the hose 6 and the hose pulley 7 as in the above. Is also prevented. Further, when the inner mast 1 rises, the hose 6 comes to a position that obstructs the field of view in front of the driver's seat through the hose pulley 7. However, in the present embodiment, the clearance between the chain wheel 4 and the hose pulley 7 is larger than in the conventional case. Since the hose 6 can be set small, the hose 6 approaches the inner mast 1 side, and the field of view in the front left and right directions from the driver's seat becomes wide.

Further, since the chain protector 11 is fixed together with the pulley bracket 10 by the bolts 8b of the pulley shaft 8, bolts for fixing the chain protector 11 are not necessary. In addition, in the present embodiment, the hose 6 is an example in which it is arranged only on one inner mast 1 side, but of course, when the hose 6 is arranged on the other inner mast 1 side as well, the same applies to the hose 6. A wide space can be secured by widening the interval.

[0020]

As described above, in the chain protector for a forklift according to the present invention, the hose can be arranged closer to the mast side than in the conventional case, so that the field of view in the front left and right directions from the driver's seat is widened. There is an effect.

[Brief description of drawings]

FIG. 1 is a front view showing an arrangement of a chain protector according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a pulley, a restriction plate, a pulley bracket, a chain protector, and a pulley shaft according to an embodiment of the present invention.

FIG. 3 is a front view showing an arrangement of a conventional chain protector.

[Explanation of symbols]

 1 Inner Mast 4 Chain Wheel 5 Lift Chain 6 Hose 7 Hose Pulley 8 Pulley Shaft 10 Pulley Bracket 11 Chain Protector

Claims (1)

[Claims] 1. A forklift in which a lift chain and a hose are arranged side by side in order from the outside on the inside of a mast, and the lift chain and hose are respectively hooked on a chain wheel and a hose pulley arranged side by side inside the upper part of the mast. The chain protector in a forklift according to claim 1, wherein the chain protector is supported on the inner side of the mast than the hose pulley, and is provided near the lower part of the chain wheel via the lower part of the hose pulley.