JP2713480B2 - Lifting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for lifting or lowering a tool or equipment part with respect to the ground in a high place work such as an electric wire construction on a power pole. The present invention relates to a suitably applied lifting device.

(Prior Art) In this type of conventional lifting apparatus, as shown in FIGS. 4 and 5, a moving rope 32 having a car operation ring 31 attached to one end thereof is supported near a work place at a high place. The pulley 33 is provided with a hook 35 for suspending a load 34 and a guide roller 36 for movably holding the moving rope 32. Have been. Then, when lifting and lowering the load 34 between the work place and the ground, the other end side of the moving rope 32 is pulled down and dragged on the ground, thereby pulling up the passing vehicle operation ring 31, and moving the moving rope 32 By pulling it out, the passing vehicle operation ring 31 is lowered.

(Problems to be Solved by the Invention) However, in the above-described configuration, when the load 34 is heavy, if the moving rope 32 held by the load 34 is lifted from the hand while the load 34 is being lifted, the load 34 It could fall and cause personal injury or equipment damage. In addition, when the hand holding the moving rope 32 is changed, the load 34 returns due to its weight, so that there is a problem that the lifting of the load 34 requires a large amount of labor. During attachment / detachment, there was a problem that the hands could not be released even if tired.

The present invention has been made in view of the above-described conventional problems, and has as its object to provide a lifting device capable of improving safety and reducing labor.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a hook portion for suspending a load on a passing vehicle operation ring, a guide roller for movably guiding and holding a moving rope, and the guide roller. And a vertically rotatable locking cam body disposed so as to clamp the moving rope therebetween, and when the locking cam body is rotated upward, the moving rope is more strongly clamped between the guide roller and the guide cam. Means for urging the locking cam body upward, and unlocking means for rotating the locking cam body downward, and the other end of the moving rope. Is connected to the unlocking means.

(Operation) According to the above configuration of the present invention, the moving rope is wound around the pulley supported at the upper position, the load is hung on the hook portion, and the operating side of the moving rope extending downward after passing through the pulley. Can be lifted by pulling
At this time, the locking cam body is urged to rotate upward, so that the locking cam surface comes into contact with the moving rope, but since the moving rope moves downward, the locking cam body resists the urging force together with the moving rope. The rope is rotated downward and the moving rope is not locked, and moves smoothly downward. On the other hand, if you intentionally remove your hand from the moving rope to stop lifting,
Even if the hand is momentarily removed from the moving rope when the hand holding the moving rope is changed, or if the hand slips unexpectedly, if the load starts to descend due to its weight, the guide roller and the locking cam body Since the operating side of the moving rope moves upward, the locking cam body rotates upward together with the moving rope, and the moving rope is sandwiched between the guide roller and the locking cam surface of the locking cam body. Since the clamping force is greater as the tension of the moving rope is larger, the moving rope is locked and the load is automatically prevented from falling. Furthermore, in order to release the lock, the free movement of the moving rope can be easily permitted only by pulling down the other end of the moving rope connected to the locking releasing means and rotating the locking cam body downward. .

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes a trolley wheel operating ring, and one end 3a of a moving rope 3 is connected to the upper end of the center frame 2 thereof. The moving rope 3
It is formed of a conductive material to prevent generation of static electricity. An intermediate portion of the moving rope 3 is wound around a pulley 4 made of bakelite having a high insulating property. The pulley 4 is mounted and supported at a position near a work place at a high place.
The operation side of the moving rope 3 extending downward from the vehicle is pulled downward to lift the passing vehicle operation ring 1.

The central frame portion 2 of the trolley wheel operating ring 1 is formed by bending a rod-like body vertically long into an annular shape. The rod-like body is extended to one side of the central frame portion 2 and bent into a U-shape to form a hook portion 5. Are integrally formed. A connecting plate 6 extends to the other side of the central frame portion 2, and a guide roller 7 made of nylon resin for movably guiding and holding the moving rope 3 is provided at an end thereof, and the moving rope 3 is formed from the guide roller 7. A pair of upper and lower rope guides 8a and 8b for preventing detachment are provided.

Reference numeral 10 denotes an aluminum die-cast locking cam body, which is rotatably mounted in a vertical direction by a pivot pin 9 fixed to a position near the center frame 2 of the connecting plate 6. The operating side of the moving rope 3 extending downward from the pulley 4 is inserted between the body 10 and the guide roller 7. Locking cam body 10
The side facing the outer periphery of the guide roller 7 is a locking cam body.
When the 10 rotates upward, the locking cam surface 11 is formed so as to sandwich the moving rope 3 more strongly with the guide roller 7. As shown in the figure, the locking cam surface 11 is formed with a saw-toothed ridge 12 having a sawtooth cross-section so that the moving rope 3 bites when the moving rope 3 relatively moves upward. Also, the guide roller 7
The sliding surface of the outer moving rope 3 is formed in a satin finish.

Instead of the ridges 12 on the locking cam surface 11, a matte surface may be formed by shot blast, or a lining material such as urethane rubber which has abrasion resistance and a large friction coefficient may be applied.

Spring hooks 13a and 13b are attached to the center of the locking cam body 10 and the upper part of the center frame 2, and a coil spring 14 is interposed between the spring hooks 13a and 13b to rotate the locking cam body 10 upward. It is energizing.

On the other hand, one end of a release wire 15 is connected to the lower end of the distal end of the locking cam body 10, and this release wire 15 extends downward through a guide hole 17 of a guide piece 16 fixed to the lower end of the central frame portion 2, At its lower end, a connecting portion 18 with the other end 3b of the moving rope 3 is formed. In the middle of the release wire 15, a stopper 19 that engages with the lower surface of the guide piece 16 and regulates the upper limit of the rotation range of the locking cam body 10 is fixed. Further, on the lower side of the other side of the central frame portion 2, a releasing wire is provided in a state where the locking cam body 10 is rotated downward against the urging force of the coil spring 14 to a position where the locking with the moving rope 3 is released. Hooks 20 for holding the released state by hooking 15 are fixed.

A detachment preventing rod 21 for closing the opening of the hook portion 5 and preventing the detachment of the load is attached to the upper portion of one side of the central frame portion 2 so as to be horizontally rotatable. A locking piece 22 made of a leaf spring elastically engaged is attached.

Reference numeral 23 denotes a pivot shaft of the guide roller 7 fixed to the distal end of the connecting plate 6. A triangular end plate 24 is fixed to the distal end of the guide roller 7 and the rope guide 8 is fixed to the end plate 24.
a and 8b are fixed.

In the above configuration, the pulley 4 around which the moving rope 3 is wound is attached near the work position at a high place, the passing vehicle operation ring 1 attached to one end of the moving rope 3 is located near the ground, and the hook portion 5 is provided. After suspending the load 25 and preventing the load 25 from accidentally coming off with the detachment prevention rod 22, the load 25 can be lifted by pulling the operation side of the moving rope 3 downward. At this time, the locking cam body 10 is urged upward by the coil spring 14 so that the locking cam surface 11 comes into contact with the moving rope 3, but since the moving rope 3 moves downward, the locking cam body 10 is rotated. 10 rotates downward together with the moving rope 3 against the urging force of the coil spring 14, the moving rope 3 moves smoothly downward without being locked, and the load 25 is lifted.

On the other hand, when the load 25 has reached the vicinity of the work position or when lifting is stopped at an arbitrary position in the middle, if the hand is released from the moving rope 3, the load 25 starts to descend by its weight, and the guide roller 7 Since the moving rope 3 moves upward between the locking cam bodies 10, the locking cam body 10 rotates upward together with the moving rope 3, and the moving rope 3 becomes the locking cam of the guide roller 7 and the locking cam body 10. The movable rope 3 is locked and the load 25 stops at that position because the movable rope 3 is clamped between the surface 11 and the clamping force increases as the tension of the movable rope 3 increases.

Not only in the case where the hand is intentionally removed from the moving rope 3 as described above, but when the hand holding the moving rope 3 is changed, the hand is momentarily detached from the moving rope 3 or the hand slips unexpectedly. Also in this case, when the load 25 starts to descend, the moving rope 3 is locked, so that the load 25 is automatically prevented from falling.

Next, in order to release the lock, the other end 3b of the moving rope 3 connected to the release wire 15 is pulled down and the locking cam body is released.
The operation side of the moving rope 3 can be easily pulled downward simply by rotating the lower part 10, and the load 25 can be continuously lifted. The load 25 can be unloaded by pulling the other end 3b of the moving rope 3 and moving the operating side of the moving rope 3 upward while rotating the locking cam body 10 downward. By stopping the lock release operation, the load 25 can be stopped.

When the load 25 is light and there is no danger of an accident due to the drop of the load 25, the release rope 15 is hooked on the hook 20 as shown by the phantom line in FIG. What is necessary is just to evacuate to the position which does not contact. Then, the operation of the moving rope 3 becomes lighter, and since the operating side of the moving rope 3 is slightly moved upward for some reason, the moving rope 3 is locked unintentionally and the unlock operation is performed every time. There are no operational inconveniences such as having to do it.

The present invention is not limited to the above embodiment. For example, the coil spring 14 is used as the urging means of the locking cam body 10, but a weight may be provided to urge by the gravity. Also, as an example of the means for holding the locking cam body 10 in the released state, the example in which the release wire 15 is pulled and hooked on the hook piece 20 has been described, but when the locking cam body 10 is swung downward to the release position. Alternatively, the coil spring 14 may be configured to extend beyond the axis of the pivot pin 9 of the locking cam body 10 and held at the release position by the urging force of the coil spring 14. Further, a roller may be used instead of the guide piece 16.

(Effect of the Invention) According to the lifting device of the present invention, the moving rope is wound around the pulley supported at the upper position, and the load is hung on the hook portion.
The load can be lifted by pulling down the operating side of the moving rope that extends downward through the pulley, and the hand is intentionally removed from the moving rope to stop the lifting, or the hand is gripping the moving rope. If the hand is momentarily detached from the moving rope or the hand slips unexpectedly when switching, the moving rope is immediately locked and the load is automatically prevented from falling, which may result in personal injury or equipment damage. And safety can be improved. Further, since the lock can be easily released by pulling down the other end of the moving rope and operating the unlocking means, the load can be stopped at an arbitrary position, and the labor for lifting the load can be reduced. The effect is obtained.

[Brief description of the drawings]

1 to 3 show one embodiment of the present invention. FIG. 1 is a front view of a passing vehicle operating ring of a lifting device, and FIG.
II-II sectional view, FIG. 3 is an overall front view of the lifting device,
FIGS. 4 and 5 show a conventional example, FIG. 4 is an overall front view of the lifting device, and FIG. DESCRIPTION OF SYMBOLS 1 ... Carrying wheel operation ring 3 ... Movement rope 4 ... Pulley 5 ... Hook part 7 ... Guide roller 10 ... Locking cam body 11 ... Locking cam surface 14 ... Coil spring 15 ... Release wire 18 …… Connection part 25 …… Load

Claims (1)

(57) [Claims] 1. A lifting device in which a trolley wheel operating ring for hanging a load is attached to one end of a moving rope wound around a pulley supported at an upper position, a hook portion for hanging the load on the trolley wheel operating ring. And a guide roller for movably guiding and holding the moving rope, and a vertically rotatable locking cam body disposed so as to clamp the moving rope between the guide roller and the locking cam. When the body is rotated upward, a locking cam surface for holding the moving rope more strongly between the guide roller and the guide roller is formed, means for urging the locking cam body to rotate upward is provided, and the locking cam body is moved downward. A lifting device, wherein a rotation releasing operation is provided on the moving rope, and the other end of the moving rope is connected to the locking releasing device.