JPH06107399A - Crane arm suspension structure - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to attach and detach the rope to and from the crane arm suspension. [Structure] A hook body 4 comprises a base portion 4a and an upper arm portion 4b and a lower arm portion 4c extending forward from the upper and lower portions of the base portion 4a. A retaining portion 9 is provided upright in front of the hook body 4. A spring 7 is arranged below the base portion 4a.
The hook guide member 8 regulates the hook body 4 so as to be capable of reciprocating only in the vertical direction. Notch 1 in base 4a
0 is formed. The lock rod 11 is arranged behind the through hole 8 a of the hook guide member 8 and
Are supported by the housing 12 so as to be movable only in the front-rear direction. A spring 13 is arranged on the rear surface side of the lock rod 11. One end of a wire rope 14 is fixed to the rear surface of the lock rod 11, and the wire rope 14 communicates with the driver's seat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane arm which is an attachment of a forklift truck, and more particularly to a structure of a hanging part for hanging a load.

[0002]

2. Description of the Related Art As a conventional crane arm which is an attachment for lifting and transporting cargo instead of fork work, for example, there is one disclosed in Japanese Utility Model Laid-Open No. 63-93400. However, in the configuration of this publication, the closing arm that prevents the rope hooked on the hook from falling off does not operate to the closed position unless the load of the load is transmitted to the load receiving arm through the rope by raising the crane arm. Therefore, depending on the rigidity of the rope, the rope may come off the hook before the crane arm rises.

Therefore, there is one as shown in FIG.
A crane arm 3 is attached to a mast 2 of a forklift truck 1 so as to be able to move up and down, and a lifting tool for locking a rope 6 for lifting a load is provided above the tip of the crane arm 3. The structure of the suspending tool is such that the clamp arm 30 is pivotally supported on the upper surface of the arm 3 so as to be pivotable in the vertical direction, and the tip of the clamp arm 30 can be vertically opposed to the upper portion of the arm 3 to prevent the rope from coming off. Clamp protrusion 31 is provided. The clamp arm 30 is pivoted up and down to open and close by driving the connected cylinder device 32 from the driver's seat or the like.

When hoisting a load, the cylinder device 32 is driven to pivot the clamp arm 30 upward to open it, and the operator lifts the hoisting rope 6 over the clamp convex portion 31 to the arm 3. It is hooked, the cylinder device 32 is driven again, and the clamp arm 30 is swung and closed. In addition, when unloading a load, the cylinder device 32 is driven to pivotally open the clamp arm 30, and the operator removes the rope 6 hooked from the arm 3 so as to move over the clamp protrusion 31. It was

[0005]

However, in the above-described crane arm suspension, when the rope 6 for suspending a load is hooked, the cylinder device 30 is driven from the driver's seat or the like to dismount the clamp arm 30. After the rope 6 is swung in the opening direction and maintained in that state, the rope 6 for hanging the load is inserted between the arm and the clamp arm 30, and then the clamp arm 30 is swung in the closing direction to be closed. Therefore, it is necessary for the worker to individually perform the operation of opening and closing the clamp arm 30 and the operation of hooking the rope 6 and holding the state when the clamp arm 30 is in the open state.

Also, when the hanging rope is removed, the cylinder device 32 is once driven from the driver's seat to turn the clamp arm 30 into the open state, and then the operator reaches the tip of the crane arm 3. It is necessary to move and hook the rope 6 so as to move it over the clamp protrusion 31 of the arm 3 and lower it. As described above, when the rope is attached to and detached from the hanging device, it is necessary to rotate the clamp arm via the cylinder device and hang the rope on and off the arm in synchronization with each other, which is troublesome. There is a problem.

The present invention has been made in view of the above problems, and an object thereof is to enable attachment / detachment of a rope to / from a hanging tool of a crane arm by a simple operation.

[0008]

In order to achieve the above object, the crane arm suspension structure of the present invention comprises:
In a crane arm suspension that is an attachment for suspending loads, a hook main body that is supported on the upper surface of the crane arm so as to be capable of reciprocating in the vertical direction, and the opening is arranged to face forward, and the hook main body of the hook main body. A hook retaining member that stands upright in front of the opening, closes the opening of the hook body when the hook body descends, and releases the opening when the hook body rises; It is characterized by comprising hook body urging means for urging the hook body upward and lock means for holding the hook body in a lowered state against the hook body urging means.

[0009]

[Operation] The rope for hanging the luggage is inserted into the pocket of the hook body through the opening of the hook body and hooked, and the hook body is pushed downward against the biasing force of the hook body biasing means. Then, the hook main body descends downward, the opening of the hook main body is closed by the stopper, and the hook is closed. At this time, since the tip of the lock rod faces the locking portion provided on the hook body, the lock rod moves toward the locking portion by the urging force of the lock urging means and is inserted into the locking portion. The hook body is prevented from moving upward, and the hook is locked in the closed state.

This prevents the rope from coming off from the hook body during the transportation of the load, especially before the crane arm is raised and the rope is no longer loose. Also, when removing the rope hooked on the hook body, lower the crane arm to loosen the rope hanging the luggage and operate the lock release means from the driver's seat, etc. The lock is released by retracting from the locking portion against the biasing force and separating from the hook body. Then, the hook body moves upward by the biasing force of the hook body biasing means.

As a result, the opening of the hook main body is opened, and the rope is moved relatively forward and disengaged from the hook main body by retracting the crane arm.

[0012]

Embodiments of the present invention will be described with reference to the drawings.
First, the structure will be described. As shown in FIG. 4, a crane arm 3 is fixed to a mast 2 arranged on the front side of a forklift truck 1. Then, the crane arm 3 is moved up and down by driving the mast 2 up and down.

As shown in FIGS. 1 and 2, the structure of the hoisting tool provided on the crane arm 3 is such that the front end of the crane arm 3 has a hook groove wide enough to engage a hook body 4 described later. 5 is formed, and the hook main body 4 is placed in the hook groove 5. The hook body 4 is composed of a base portion 4a and an upper arm portion 4b and a lower arm portion 4c that extend forward from the upper and lower portions of the front surface of the base portion 4a, and the opening 4d has a U-shaped vertical cross section with the front facing forward. Has become. The upper arm portion 4b of the hook body 4 extends forward of the lower arm portion 4c.

Further, a retaining portion 9 is erected from the upper surface of the tip of the crane arm 3 which vertically opposes the tip portion 4e of the upper arm portion 4c, and the hook body 4 is lowered to part of the upper surface of the crane arm 3. When contacting the bottom portion 5a of the hook groove 5 which is the
The opening 4d of the hook main body 4 is brought into a closed state by coming into contact with or close to the lower surface of the tip 4e of b.

Further, a spring hole having a shaft up and down is formed in the lower surface of the base portion 4a of the hook body 4, and a hook serving as a hook body urging means is provided between the ceiling surface of the spring hole and the hook groove 5. Springs 7 are arranged above and below the shaft.
The hook body 4 is biased upward by the
A cylindrical hook guide member 8 is provided upright from the hook groove 5 so as to surround the outer periphery of the base portion 4a excluding the front thereof, and regulates the hook body 4 so as to be capable of reciprocating only in the vertical direction. Further, a notch portion 10 serving as a locking portion is formed on the upper rear side of the base portion 4a.

Further, on the rear wall portion of the hook guide member 8, the shaft is moved back and forth at the same height as the cutout portion 10 of the hook body 4 when the hook body 4 is lowered until it comes into contact with the hook groove 5. A through-hole 8a facing to is opened.
Behind the through hole 8a, the lock rod 11 is provided with the through hole 8a.
The lock rod 11 is arranged coaxially with the housing 1
Crane arm 3 that can be moved only forward and backward by 2
Supported by. The housing 12 is provided with a hole 12a extending rearward from the front side, and the lock rod 11 is slidably inserted into the hole 12a. Further, the hole 12a communicates with another hole 12b having a small diameter which is opened from the rear surface side of the housing 12 toward the front.

Further, a spring 13 for the lock rod 11, which is a lock rod urging means having its axis oriented horizontally in the front-rear direction, is arranged on the rear surface side of the lock rod 11 inserted in the housing 12, and the spring 13 The lock rod 11 is urged forward by the urging force, and the tip end portion thereof is brought into contact with the rear surface of the base portion 4a of the hook body 4 through the through hole 8a of the hook guide member 8.

Further, one end of the wire rope 14 is fixed to the rear surface of the lock rod 11. That wire rope 1
4 extends rearward through a hole 12b on the rear side of the housing 12, and the other end communicates with the driver's seat. And
The lock rod 11 is retracted by pulling the wire rope 14 rearward, and constitutes lock releasing means.

In the hanging structure having the above construction, in the initial state, as shown in FIG. 3, the hook body 4 is in a state of being raised upward by the biasing force of the hook spring 7. The upper surface of the lower arm portion 4c of the hook body 4 is located at the same height as the upper end surface of the slip-off preventing portion 9 located forward, and thus the hook is in the open state. Then, when carrying the luggage, the worker attaches the rope 6 slung to the luggage,
The hook body 4 is inserted into the pocket of the hook body 4 through the opening 4d of the hook body 4, and the hook body 4 is pushed downward.

When the hook body 4 descends and comes into contact with the bottom surface of the hook groove 5, as shown in FIG. 1, the tip end of the lock rod 11 biased toward the hook body 4 causes the hook body 4 to move. The hook body 4 is inserted into the notch portion 10 and is prevented from moving upward. At this time, the tip of the upper arm portion 4b of the hook body 4 comes close to the upper end surface of the retaining portion 9, and the opening 4d of the hook body 4 is closed to close the hook.

As a result, the rope 6 hooked on the hook is prevented from coming off the pocket of the hook main body 4, and the crane arm 3 is raised to lift the cargo for a predetermined period while the rope 6 for the cargo is hooked on the hook. To the location. And when unloading, the crane arm 3
To lower the rope 6 of the luggage by placing the luggage in a predetermined place, and further pulling the wire rope 14 from the driver's seat to resist the biasing force of the spring 13 for the lock rod 11 Retreat 11.

Then, the tip portion of the lock rod 11 is retracted and disengaged from the notch portion 10 of the hook body 4, and the hook body 4 is moved upward by the urging force of the hook spring 7 to be in the same position as in the initial state. Then, the opening 4d is opened. Next, the crane arm 3 is retracted by retracting the forklift truck 1, and the rope 6 in the hook body 4 is retracted.
However, the hook body 4 is relatively moved forward from the pocket and disengaged, and the luggage is unloaded.

In the above embodiment, the hook body 4 has a U-shape, but the shape is not limited to this shape as long as the opening 4d faces forward.
The upper and lower arms may have another shape such as an arc shape. In the above embodiment, the locking portion 10 for locking the lock rod 11 is formed by cutting out the rear surface of the base portion 4a. It is also possible to form a groove into which can be inserted as a locking portion.

Further, the hook groove 5 is provided on the upper surface of the crane arm 3.
Although the groove 5 is formed, the hanging structure may be formed directly on the upper surface of the crane arm 3 without forming the groove 5.

[0025]

As described above, in the crane arm lifting device structure of the present invention, the rope for hanging the load is simply inserted into the hook body and the hook body is pushed downward, whereby the rope is easily hooked to the hook. Is locked and the hook is locked in the closed state, and the lock is released only by activating the unlocking means from the driver's seat and retracting the crane arm, and the rope is disengaged from the hook body and the luggage can be unloaded. Only one driver of a forklift truck will be able to easily attach and detach the rope to the suspension.

[Brief description of drawings]

FIG. 1 is a side view showing a structure for suspending a crane arm according to an embodiment of the present invention.

FIG. 2 is a front view showing a structure for suspending a crane arm according to an embodiment of the present invention.

FIG. 3 is a front view showing an initial state of a crane arm suspension structure of an embodiment according to the present invention.

FIG. 4 is a side view showing a forklift truck including a crane arm suspension structure according to an embodiment of the present invention.

FIG. 5 is a side view showing a forklift truck provided with a conventional crane arm suspension structure.

[Explanation of symbols]

 3 Crane Arm 4 Hook Main Body 4d Opening 6 Rope 7 Spring (Hook Main Body Energizing Means) 8 Hook Guide Member 9 Detach Prevention Part 10 Notch (Locking Part) 11 Lock Rod 12 Housing 13 Spring (Lock Bar Energizing Means) ) 14 wire rope

Claims (1)

[Claims] 1. A hanging device for a crane arm, which is an attachment for hanging a load, comprising: a hook main body, which is supported on the upper surface of the crane arm so as to be capable of reciprocating in the vertical direction and has an opening facing forward. Of the hook that stands upright in front of the opening of the hook body, closes the opening of the hook body when the hook body descends, and releases the opening when the hook body rises. And a lock means for holding the hook body in a lowered state against the hook body urging means. Crane arm hanging structure.