JPH0865866A - Boltless electric wire holding tool and construction check method - Google Patents

Abstract

PURPOSE: To easily mount an electric wire in an accurate position and easily check it while mounting it. CONSTITUTION: A boltless electric wire holding tool 50 is one in which a clamp main body 52 and a clamp cap 54 are rotatably connected to each other by a hinge 56 at the one end side and a clamp cap opening end 54a is fastened to the clamp main body 52 by an eccentric can 58, and the eccentric cam 58 has a temporarily fastening surface for maintaining the state of temporarily fastening the clamp cap 54 and a regularly fastening surface for maintaining the state of strongly compressing the clamp cap 54.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boltless wire gripping tool used for a damper for preventing twisting of overhead wire, a spacer between overhead wires, and a method for confirming the construction thereof.

[0002]

2. Description of the Related Art An overhead wire twist prevention damper, an overhead wire spacer, and the like are used to hold an overhead wire with a clamp body and a clamp cap, and fix the clamp cap to the clamp body with bolts to attach it to the overhead wire. there were. However, in the case of using such a bolt, the bolt may loosen due to vibration during use, the clamp cap may open, and the twist prevention damper and the spacer may drop.

Therefore, in order to prevent such a drop, a boltless wire gripping tool that does not use a bolt has been proposed. What is shown in FIG. 6 is a conventional boltless electric wire gripping tool 1
0, a clamp body 12 and a clamp cap 14 are provided, and one end side of these is rotatably connected by a hinge portion 16. A hook rod 18 is slidably penetrated through the clamp body 12 corresponding to the opening end 14a of the clamp cap 14 on the side opposite to the hinge portion 16.

At the open end 14a of the clamp cap 14, a hook portion 18a at the tip of the hook rod 18 (see FIG. 7).
A long hole 14b for inserting the hook rod 18 is opened after passing through the hook portion 18a in parallel with the long hole 14b.
The hook portion 18a is hooked on and locked by the clamp cap 14 by rotating once. The clamp cap 14 is provided with a stopper 14c (see FIG. 7) so that the hook portion 18a does not rotate more than 90 degrees.

A clamp spring 20 is fitted to the base of the hook bar 18 projecting to the rear side of the clamp body 12. One end of the clamp spring 20 is in contact with the bottom surface of the groove 12a on the back surface of the clamp body 12. A spring receiver 22 is further slidably fitted to the base of the hook rod 18, and the other end of the clamp spring 20 is in contact with the spring receiver 22. An eccentric cam 24 is rotatably supported by a pin 26 at the base end of the hook rod 18.

As shown in FIG. 7, the outer peripheral surface of the eccentric cam 24 is a flat final fastening surface 2 having a large distance from the pin 26.
8 and a spherical cam surface 30 with a small distance from the pin 26
And are provided at different positions by 180 degrees. An operation hole 24a for inserting the tightening rod 32 for rotating the eccentric cam 24 is provided in a part of the eccentric cam 24.
At the other end of the clamp body 12, the line spacer body 34
(See FIG. 6) Alternatively, a twisting prevention weight is connected by a bolt, a nut, and a soundproof spring.

Next, a method of attaching the overhead wire of the boltless wire gripping tool 10 will be described with reference to FIGS. 6 and 7. Figure 6
As shown in, the hook rod 18 is pulled out to open the clamp cap 14, the overhead wire is passed between the clamp cap 14 and the clamp body 12, the clamp cap 14 is closed and the hook rod 18 is inserted, and the hook rod 18 is rotated by 90 degrees. Section 18a
To the clamp cap 14.

Next, as shown in FIG. 7 (a), a tightening rod 32 is passed through the operation hole 24a of the eccentric cam 24, and the eccentric cam 24 is rotated 180 ° by rotating the tightening rod 32 by 180 ° in the direction of the arrow. Then, as shown in FIG.
The final tightening surface 28 of the eccentric cam 24 is brought into contact with the spring receiver 22. Since the outer peripheral surface of the eccentric cam 24 moves from the cam surface 30 to the final tightening surface 28, the clamp spring 20 is strongly compressed by the compression action due to the increase in diameter. Therefore, the clamp cap 14 is strongly pressed against the clamp body 12 side by the hook bar 18 and the clamp spring 20, so that the clamped state can be reliably prevented from being released during use.

The boltless wire gripping tool 10 thus mounted is always subjected to a construction confirmation after the mounting. This construction confirmation method is carried out by visual confirmation from the ground or a helicopter after the mounting, or the eccentric cam 24 is attached. A clamp confirmation member 36 (see FIG. 7A) made of metal, plastic, or wood that is cut when tightened is attached to the spring receiver 22 in advance, and the clamp confirmation member 36 cut during the construction is collected and returned to the ground. The number was counted to confirm whether the clamp cap 14 was in the strongly compressed state.

[0010]

However, in such a boltless wire gripping tool, since the cam surface of the eccentric cam is spherical, the eccentric cam is stopped during rotation to temporarily tighten the clamp cap to position the clamp body. Therefore, even if you want to temporarily tighten it, temporarily tighten it completely,
In the case of readjustment, it was necessary to release the fully tightened state again. As described above, when the clamp main body is attached at an incorrect position, the clamp main body must be attached again from the beginning, which is very troublesome.

Further, the method of confirming the construction of the boltless wire gripping tool is visual, but it is difficult to confirm it visually when the construction site is in a mountainous area, a river, etc., and using a helicopter or the like increases the cost. There is a problem. Further, the clamp confirmation member has a problem that the clamp confirmation member is uncollected and the clamp confirmation member is easily lost.

[0012]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a boltless electric wire gripper which can be easily attached at an accurate position.

Another object of the present invention is to provide a method of confirming the construction of a boltless electric wire gripper, which enables the construction to be confirmed easily while mounting.

[0014]

In order to achieve the above-mentioned object, the present invention has a clamp body and a clamp cap, which are rotatably connected to each other at a hinge portion at one end side thereof, the clamp cap opening end or the clamp body. In the boltless wire gripping tool fixed by tightening the eccentric cam, the eccentric cam has a temporary tightening surface for maintaining the clamp cap in a temporarily tightened state and a final tightening surface for maintaining the clamp cap in a strongly compressed state. is there.

Further, as a means of claim 2, the eccentric cam in the temporarily tightened state is tightened by a tightening rod having a counter to rotate the eccentric cam, and thereby the eccentric cam is finally tightened and the finally tightened state is set. The number of rotations of the eccentric cam is counted, and the construction is confirmed by the number of counts.

[0016]

As described above, since the eccentric cam has the temporary tightening surface for maintaining the clamp cap in the temporarily tightened state and the final tightening surface for maintaining the clamp cap in the strongly compressed state in the boltless wire gripping tool of the present invention. , Easy temporary tightening and easy release.

Further, the eccentric cam in the temporarily tightened state is tightened with a tightening rod having a counter to rotate the eccentric cam,
As a result, the eccentric cam is in the final tightened state, the number of revolutions of the eccentric cam in the final tightened state is counted, and the construction confirmation is performed based on the number of counts. The problem of uncollected and lost items also disappears.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, in the boltless wire gripping tool 50, a clamp body 52 and a clamp cap 54 are rotatably connected at one end side by a hinge portion 56, and the clamp cap opening end 54 a is eccentric to the clamp body 52. 58
It is fixed by tightening.

As shown in FIG. 2A, the eccentric cam 58 has a U-shaped cross section and has an operation hole 60 at the bottom of the U-shape. Further, as shown in FIG. 2B, the outer peripheral surface of the eccentric cam 58 has cam surfaces 62 and 63 for gradually compressing the clamp cap 54 and a temporary tightening surface 64 for maintaining the clamp cap 54 in a temporarily tightened state. , And a final tightening surface 66 for maintaining the clamp cap 54 in a strongly compressed state.

The cam surfaces 62 and 63 are formed in a spherical shape so that the eccentric cam 58 can easily rotate with a small force. The temporary fastening surface 64 is formed with a concave surface portion 64a having a corrugated shape, a rectangular shape,
The eccentric cam 58 is supported by the crests 64b at both ends of the concave surface portion 64a, and the rotation is stopped. Note that FIG.
As shown in (c), the temporary fastening surface 64 may be a flat surface portion 64c. In this case, the flat surface portion 64c has a structure that supports the eccentric cam 58 and stops the rotation.

FIG. 3 shows the rotating state of the eccentric cam 58. When the eccentric cam 58 in the state shown in FIG. 3A is rotated, the clamp spring 68a is gradually compressed by the compression action due to the increase in the diameter of the cam surface 62 from the pin. As shown in FIG. 3B, when the temporary tightening surface 64 contacts the spring receiver 68, the clamp spring 68a is in a weakly compressed state and prevents the eccentric cam 58 from rotating. The clamp body is positioned in this state. And further eccentric cam 5
8 is rotated, the clamp spring 68a is gradually compressed from the weakly compressed state by the compression action of the cam surface 63, and FIG.
As shown in (c), when the final tightening surface 66 contacts the spring receiver 68, a strong compression state is established. Although not shown, the cam surface 63 may be omitted. In this case, the cam surface 62, the temporary fastening surface 64, and the final fastening surface 66 are brought into contact with the spring receiver in this order.

FIGS. 4A and 4B show another embodiment of the eccentric cam, in which two eccentric cams 70 and 71 having different sizes are used. The larger eccentric cam 71 has a larger diameter portion 71a than the smaller eccentric cam 70.
Since it is formed larger than the large-diameter portion 70a, the compression action due to the increase in diameter is large. Therefore, a small eccentric cam 70 for temporary tightening is used when the clamp cap 54 is in the slightly compressed state, and a large eccentric cam 71 for final tightening is used when the clamp cap 54 is in the strongly compressed state.

Next, a method of confirming the construction of the boltless wire gripping tool will be described. The method for confirming the construction of the boltless electric wire gripping tool 10 is as follows: the tightening rod 7 having the counter shown in FIG.
4 to the operation hole 6 of the eccentric cams 58 and 71 as shown in FIG.
The number of times that the clamp cap 54 is inserted into 0 and rotated in the direction of the arrow A to make the clamp cap 54 in the strongly compressed state is counted, and the construction is confirmed by the counted number.

The tightening rod 74 shown in FIG. 5A includes a grip portion 76, a spring portion 78, and a count display plate 80. The grip portion 76 is connected to the count display plate 80 via the spring portion 78. When the grip portion 76 is strongly pushed with a force larger than the repulsive force of the spring portion 78, the number on the count display plate 80 is increased by one.

Therefore, since the force required for the temporary tightening state is smaller than the repulsive force of the spring portion 78, the grip portion 76 cannot be pushed in, and the large force required for the final tightening state is the spring portion 7.
Since it is larger than the repulsive force of 8, the grip portion 76 can be pushed in and is counted.

Further, as shown in FIG.
4 includes a count display plate 80 and a button 82, which are connected to each other. When the button 82 is pressed, the number on the count display plate 80 increases by one.

If a spacer or the like having four boltless wire grippers is attached to the overhead wire with such a tightening rod 74, if the count display plate 80 of the tightening rod 74 is 4, there is no forgetting to tighten, and if it is 3. You can immediately see that you have forgotten to tighten it in one place, and you can tighten it immediately. Therefore, it is possible to confirm the construction while mounting the boltless electric wire gripping tool.

[0028]

As described above, in the boltless wire gripping tool of the present invention, the eccentric cam keeps the clamp cap in a temporarily tightened state, and the clamp cap keeps the clamp cap in a strongly compressed state. Since it has, it can be attached after positioning the clamp body. Therefore, the boltless wire gripping tool can be easily and accurately attached to the position.

The method for confirming the construction of the boltless electric wire gripping tool is as follows.
Tighten the temporarily tightened eccentric cam with a tightening rod that has a counter to rotate the eccentric cam.Then, the eccentric cam is finally tightened, and the number of revolutions of the eccentric cam in this final tightened state is counted. Since the work is checked, it is possible to check the work while mounting the clamp body. Further, unlike the conventional case, there is no problem that the clamp confirmation member is not recovered or lost, and the count number can be surely confirmed. Therefore, a trouble such as forgetting to tighten the boltless electric wire gripping tool does not occur, and it is possible to easily and surely confirm the construction after mounting.

[Brief description of drawings]

FIG. 1 is a side view showing a boltless electric wire gripper of the present invention.

2 (a) is a plan view showing an eccentric cam, FIG.
2B is a side view of FIG. 2A, and FIG. 2C is a side view of another embodiment of the eccentric cam.

3A is an explanatory view showing a non-compressed state of the clamp cap, FIG. 3B is an explanatory view showing a weakly compressed state of the clamp cap, and FIG. 3C is a strongly compressed state of the clamp cap. FIG.

4 (a) is a plan view showing still another embodiment of the eccentric cam, and FIG. 4 (b) is a side view of FIG. 4 (a).

5 (a) is an explanatory view showing a tightening rod, FIG.
(B) is an explanatory view showing another embodiment of the tightening rod.

FIG. 6 is a side view showing a conventional boltless wire gripping tool.

7 (a) is an explanatory view showing a non-compressed state of the clamp cap of FIG. 6, and FIG. 7 (b) is an explanatory view showing a weakly compressed state of the clamp cap of FIG.

[Explanation of symbols]

 50 Boltless wire gripping tool 52 Clamp body 54 Clamp cap 56 Hinge part 58 Eccentric cam 60 Operation holes 62, 63 Cam surface 64 Temporary tightening surface 66 Final tightening surface 68 Spring bearing 70, 71 Eccentric cam 72 Counter 74 Tightening rod 76 Grip 78 Spring part 80 Count display plate 82 Button

Claims (2)

[Claims] 1. A boltless electric wire gripper in which a clamp body and a clamp cap are rotatably connected at one end side thereof by a hinge portion, and an opening end of the clamp cap is fixed to the clamp body by tightening an eccentric cam. The eccentric cam has a temporary tightening surface for maintaining the clamp cap in a temporarily tightened state, and a final tightening surface for maintaining the clamp cap in a strongly compressed state. 2. An eccentric cam in a temporarily tightened state is tightened with a tightening rod having a counter to rotate the eccentric cam, thereby bringing the eccentric cam into a final tightened state and counting the number of revolutions of the eccentric cam in the finally tightened state. Then, the construction confirmation method of the boltless electric wire gripping tool is characterized in that the construction confirmation is performed by the count number.