JPS6224816Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a safety hook that is attached to the tip of a ladder, etc.

When connecting telephone lines supported by messenger wires, normally, as shown in Figure 1,
A ladder 1 with hooks 3 attached to the ends of supports 2, 2 on both sides is used.

The ladder 1 is constructed so that the hook 3 attached to the end of the support column 2 is engaged with the messenger wire A, and the ladder 1 is placed between the ground and the messenger wire A, or hung over the messenger wire A. Therefore, when the messenger wire A swings due to the movement of going up and down along the ladder 1, the hook 3 moves against the wire A.
There is a risk of it coming off, which poses a safety problem.

Therefore, this invention solves the above problems and provides an extremely safe hook that can be held in an engaged state by simply hooking it onto an object to be engaged, such as a messenger wire. is intended to provide.

The structure of this invention is that a lever support arm is swingably attached to one of the legs extending from the U-shaped bent portion of the hook body, and a swing limiting pin is attached to the tip of this lever support arm. The midway of the opening/closing lever extending diagonally between the opposing legs of the main body is swingably supported, and the opening/closing lever is moved between the pair of legs by the elasticity of the stiff spring provided between the lever support arm. a spring that deflects one lever support arm toward the other leg; a lock mechanism capable of holding the lever in a state where the opening/closing lever extends from the tip of the lever support arm; The hook body is engaged and disengaged by moving the hook body up and down relative to the messenger wire.

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

As shown in FIGS. 2 and 3, the hook body 10 has a pair of legs 1 at both ends of a U-shaped bent portion 11.
2 and 13, and one leg 12 swingably supports the opposing side plate 16 of the lever support arm 15 via a pin 14. Further, a spring 17 is supported by the pin 14, and the elasticity of the spring 17 deflects the lever support arm 15 so that the tip of the lever support arm 15 swings toward one of the legs 12.

A swing limiting pin 18 is passed between the tips of the side plates 16 of the lever support arm 15, and this limiting pin 18 allows the opening/closing lever 19 to be moved between the opposing side plates
0 is swingably supported. Further, a tight spring 21 is supported by the restriction pin 18 , one end of the tight spring 21 engages with the opening/closing lever 19 , and the other end engages with the lever support arm 15 . The elasticity of this tight spring 21 is stronger than the elasticity of the spring 17 for deflecting the lever support arm 15, so that the opening/closing lever 19 is held in a state extending between the opposing legs 12 and 13.

A lever support pin 22 is passed between the central portions of the side plates 16 of the lever support arm 15, and a locking lever 23 is swingably supported by the lever support pin 22. The locking lever 23 is provided with a pair of side plates 25 on both sides of a stopper plate part 24 at an interval in which a part of the legs 12 of the hook body 10 can be fitted, and an operating piece 26 on one side edge of the side plates 25. is formed. The locking lever 23 is biased by a spring 27 supported by the lever support pin 22, so that the end edge of the stopper plate portion 24 comes into contact with the inner surface of the leg 12 of the hook body 10.

A hook portion 28 is formed at the tip of the side plate 25 of the locking lever 23, and when the opening/closing lever 19 is swung around the swing limiting pin 18 to extend the lever 19 to the tip of the lever support arm 15. The end portion of the side plate 20 of the opening/closing lever 19 is adapted to engage with this hook portion 28.

The safety hook shown in the embodiment has the above-described structure, and is used by being attached to, for example, the tip of a support 2 of a ladder 1 as shown in FIG.

Now, when a part of the messenger wire A is brought into contact with the lower side of the opening/closing lever 19 extending diagonally between the legs 12 and 13 of the hook body 10 (see Fig. 3), and the hook body 10 is pulled down, the swing Movement limit pin 18
The opening/closing lever 19 swings around, and the tip of the opening/closing lever 19 and the other leg 13 of the hook body 10
A part of the messenger wire A tries to pass through the gap (see Fig. 4). When the messenger wire A completely passes between the two, the opening/closing lever 1
Reference numeral 9 swings in the opposite direction due to the elasticity of the stiff spring 21 and extends diagonally between the opposing legs 12 and 13, and the messenger wire A is opposed to the legs 12, 13.
Preventing from falling out of the 13-space. Therefore,
Even if the messenger wire A swings, the hook body 10 will not come off from the wire A, making it extremely safe.

Next, when the hook body 10 is pushed up in a state in which the safety hook is engaged with the messenger wire A, a part of the messenger wire A comes into contact with the upper side of the opening/closing lever 19 in an inclined state, and This part fits into the acute angle formed by the leg 12 and the opening/closing lever 19 (see FIG. 5). Then, when the hook body 10 is further lifted, the opening/closing lever 19
When the opening/closing lever 19 swings around the swing limiting pin 18 and swings to a position where it extends from the tip of the lever support arm 15, the end of the side plate 20 of the opening/closing lever 19 engages with the hook of the locking lever 23. 28, and the lever support arm 15 and the opening/closing lever 19 are integrally coupled (see FIG. 5). Therefore, when the hook body 10 is pulled down relative to the messenger wire A and the inside of the U-shaped bent portion of the hook body 10 is engaged with the wire, the lever support arm 15 swings due to the elasticity of the spring 17, and the hook The tip of the opening/closing lever 19 and the other leg 1 of the hook body 10 are aligned along one leg 12 of the main body 10.
3, a gap can be formed through which the messenger wire A can pass.

Note that after passing wire A through the above gap,
When the operating piece 26 of the locking lever 23 is pressed to swing the locking lever 23, the hook portion 2 of the locking lever 23 is rotated.
8 comes off from the end of the side plate 20 of the opening/closing lever 19,
The opening/closing lever 19 is swung by the elasticity of the locking spring 21, and the opening/closing lever 19 is swung by the elasticity of the tightening spring 21, and the opening/closing lever 19 swings to close the opposite legs 12, 13 of the hook body 10.
It will be over a period of time.

The safety hook according to this invention can be used for purposes other than hanging the ladder 1 on and off the messenger wire A as described above. For example, as shown in FIG. 6, by connecting the hook body 10 to the end of the master rope B and engaging the hook body 10 with a bar C or the like installed horizontally at a high place,
The master rope B can be suspended from the bar C. In this case, a connecting shaft 29 is formed at the end of the leg 12 of the hook body 10 to allow the telescopic rod D to be attached and detached so that the hook can be attached and removed by operating the telescopic rod D.

In the case of the embodiment, the opening/closing lever 19 extending to the tip of the lever support arm 15 is held in a state of being extended to the arm 15 by the action of the locking lever 23, but the locking mechanism of the opening/closing lever 19 depends on this. It is not limited.

As described above, in this invention, when the hook body is engaged with an installation object such as a messenger wire, the opening/closing lever supported at the tip of the lever support arm extends between the opposing legs of the hook body. It is extremely safe because it prevents it from coming off the structure. In addition, when a construction object is brought into contact with the lower side of the opening/closing lever and the hook body is pulled down, the hook body engages with the construction object and is prevented from coming off by the opening/closing lever.Next, when the hook body is pushed up, the opening/closing lever Since the lever support arm and the lever support arm are integrally connected to form a space between the tip of the opening/closing lever and the leg of the hook body through which the construction object can pass, it is extremely easy to operate the hook on and off the construction object. .

[Brief explanation of drawings]

Figure 1 is a perspective view of a ladder leaning against the messenger wire, Figure 2 is a front view showing one embodiment of the safety hook according to this invention, and Figures 3 to 5 are the messenger wire. FIG. 6 is a vertical sectional front view showing stepwise the operation of engaging and releasing the safety hook as described above, and FIG. 6 is a front view showing another example of use of the safety hook as described above. 10...Hook body, 11...Bending portion, 12,
13... Leg body, 15... Lever support arm, 16
... Side plate, 17 ... Spring, 18 ... Swing limit pin, 19 ... Opening/closing lever, 21 ... Tight spring.

Claims (1)

[Scope of utility model registration request] The opposing side plates of the lever support arm are swingably attached to one leg extending from the U-shaped bent portion of the hook body, and the tip of the arm swings toward the one leg of the hook body as described above. A spring is provided to deflect the arm, a swing limiting pin is passed between the ends of the side plates of the arm, and a swingable opening/closing lever whose central portion is supported by the limiting pin is inserted between the opposing legs of the hook body. The limit pin has a lever support so that the opening/closing lever deflects the lever in a direction spanning between the opposing legs, and the tip of the lever support arm moves in the direction of the other leg. A tight spring that deflects the arm is installed, and the elasticity of this tight spring is made stronger than the spring elasticity, so that when the opening/closing lever swings and extends from the tip of the lever support arm, this opening/closing lever is supported by the lever. A safety hook with a locking mechanism that connects to the arm.