JPH0728569U - Hook for step bolt - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent breakage and fall of the step bolt that hooks the hook of the auxiliary rope used by workers at high altitude to prevent fall. A pressing cap is provided for shielding a predetermined area in the hook of the hook body, and the pressing cap maintains a pressed state against an object to be locked (step bolt). [Effect] Since the step bolt can be fixed to a position near the electric pole surface, it can withstand an impact load at the time of a fall, prevent the step bolt from being broken, and prevent a fall accident.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present application relates to a fall prevention auxiliary rope hook for use in work at heights, particularly in communication line work for distribution poles and electric work.

[0002]

[Prior Art and Problems]

 Conventionally, when working on utility poles, auxiliary ropes have been used in addition to the so-called safety belts on the poles, which connect the operator and the utility pole, to prevent falls while moving the work position. When working at a certain position on the utility pole, perform a U-shaped suspension work by holding the utility pole with a safety belt rope, and when moving the work position, the protrusions from the surface of the utility pole such as the sleeve sign will obstruct the work. Then, if it is difficult to move in the U-shaped suspension state, first hook the auxiliary rope on the step bolt, then remove the safety belt rope and move, and when the movement is over, remove the safety belt rope first. It was hung and then the hook of the auxiliary rope was removed. In this way, it was possible to eliminate the occurrence of an unprotected state even for a moment. As shown in FIG. 5, a step bolt generally has a base end portion embedded in a utility pole P and a tip end portion formed with a non-slip protrusion. Although the hook of the auxiliary rope is hooked on the step bolt S, it was thought that a dangerous state might occur depending on the position of the lock. If there is a hook at the position that comes into contact with the protrusion, if a crash occurs at that position, an impact load of nearly 1 ton will be applied, and the step bolt may break on the pole surface, and it may not be possible to prevent the crash. The length of the step bolt projecting from the pole surface is about 100 mm, and when the operator drops the rope length of 1 m with the hook hanging 80 mm from the pole surface, the drop impact load is 730 kgf. Yes, the moment applied to the step bolt on the surface of the utility pole is 58400 kgf · mm. Therefore, there is a possibility that the step bolt may be bent or cut depending on the position of the pole surface. Even if a similar drop occurs, if the hook is hooked at a position 10 mm from the pole surface, the moment will be 730 kgf · mm, and it will be able to withstand the impact of a fall. Although it can be understood that it is safe to hang the hook of the auxiliary rope at a position close to the electric pole surface of the step bolt in this way, there was a problem in actual work. As shown in Fig. 5, the hook of the auxiliary rope that is commonly used at present has an opening / closing cap for closing the hook and a safety cap for controlling its rotation. The inner diameter of the hook was about 18 to 22, and the step bolt could be freely moved in the closed state. This margin was due to the ease of hooking and removing the hook. Therefore, when instructing the worker to place the auxiliary rope near the pole surface of the step bolt, even if this was observed, the hook that was connected to the worker's waist with a 1m rope would not , The movement of the worker is transmitted and moves on the step bolt. Therefore, it was impossible to maintain the position close to the pole surface.

[0003]

[Means for Solving the Problems]

 Instruct the operator to hang the hook on the power pole of the step bolt when using the auxiliary rope, and make sure that the hook does not move during the work and the hook is strong when an impact load is applied. The problem is solved by adopting a structure for securing the position in the hook for the auxiliary rope. Specifically, a pressure cap that overlaps with the opening and closing cap and rotates in the same manner is provided, and the tip of the pressing cap is projected into the hook that is normally closed, and the step bolt is inserted into the hook. When it is positioned, the tip of the pressing cap is removed from the hook against the spring, and the spring exerts a pressing force on the step bolt to maintain the locked position.

[0004]

【Example】

 An opening / closing cap 4 is provided on the abdomen side of the hook body 1 for rotating the hook 2 so as to open and close, and a safety cap 5 for engaging with the opening / closing cap 4 to control the rotation is provided on the back side. Another rotation shaft 61 is provided at a position near the rotation shaft 41 of the opening / closing cap 4 and close to the back side, and a spring 63 is arranged at the base end of the pressing cap 6 to lock it. The pressure cap 6 has a shape similar to that of the open / close cap 4, overlaps with the inside of the open / close cap 4, and the tip portion is protruding into the hook 2 unlike the open / close cap 4, and is always in the hook 2 The inside is shielded over a predetermined range. Further, the tip of the protruding portion 62 is formed in an eccentric arcuate shape whose distance gradually becomes longer than that of the rotating shaft 61. The open / close cap 4 is engaged with the safety cap 5, and the hook 2 cannot be opened by rotating the safety cap 5 unless the safety cap 5 is rotated, but the pressing cap 6 is free regardless of the safety cap 5. It is in a state of turning to. The hook of the present application having the above structure, the rope 7 is attached to the rope connecting ring 3 for use. When hanging the hook on the step bolt S of the utility pole P when moving the work position, hang it as close to the utility pole surface as possible. When the step bolt S enters the hook 2, the protruding portion 62 of the pressing cap 6 protruding into the hook 2 is pushed and stops at the position against the spring 63, and the pressing cap 6 presses the step bolt S. Continue to maintain its locked position. This pressing is applicable to the step bolts S having different diameters because the arc of the protrusion 62 is eccentric with respect to the rotating shaft 61 and the pressure of the spring 63 is constantly applied. Therefore, the hook does not move on the step bolt S when the rope sways along with the worker's motion. In this state, even if a fall occurs, the hook is locked at a position close to the electric pole surface of the step bolt S, that is, at a position with a large withstand load at the base, so no breakage accident of the step bolt S occurs, There is no crash. Further, in the above embodiment, the rotating shaft 61 of the pressing cap 6 is provided separately from the rotating shaft 41 of the opening / closing cap, but as shown in FIG. 4, it is provided coaxially and has an engaging relationship with the safety cap 5. The structure which does not have the same effect as that of the above embodiment. In addition, the protrusion 62 of the pressing cap 6 is formed in a sawtooth shape so that the pressing of the step bolt becomes more reliable.

[0005]

[Effect of device]

 As described above, by using the hook of the present invention, it is possible to prevent accidents due to breakage of the step bolt during work on the electric pole. When locking the hook of the auxiliary rope to the step bolt, it is necessary to keep the assumption that the utility pole must be contacted, but if this is possible, the possibility of a fall accident during movement during work on the utility pole is possible. It eliminates the problem.

[Brief description of drawings]

FIG. 1 is a front view of an engaged state of a hook of the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 is a front view of the hook of the present invention.

FIG. 4 is a front view of a second embodiment of the present hook.

FIG. 5 is a perspective view of a conventional hook locking state.

[Explanation of symbols]

 1 Hook body 2 Hook 3 Rope connecting ring 4 Opening / closing cap 5 Safety cap 6 Press cap 7 Rope 41, 61 Rotating shaft 62 Projection 63 Spring P Utility pole S Step bolt

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Ryuichi Iwaki 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation

Claims (1)

[Scope of utility model registration request] 1. A hook provided with an opening / closing cap 4 for pivoting the hook 2 provided at one end of the hook body 1 so as to open and close, and a safety cap 5 for controlling the pivoting of the opening / closing cap 4. The base end is fixed coaxially with the rotation axis 41 of the cap 4 or in the vicinity of the rotation axis 41, the tip projects into the hook 2 to shield a predetermined area in the hook 2, and the spring 63 always opens and closes the cap. 4) and they rotate at the same time.
A hook for a step bolt, which is provided with a pressing cap 6 for maintaining a pressed state against an object to be locked.