JPH0919038A - Fastening appliance for overhead wire - Google Patents

Abstract

PURPOSE: To provide a fastening appliance by which a coming-along part and an anchor metal fitting used in a sagging operation to an overhead wire to be stretched on a steel tower can be attached to the overhead wire by a simple operation, equally and surely. CONSTITUTION: A fastening appliance is formed of a body 1 in which one pair of right and left sandwiching and holding bodies 2 provided with coupling parts used to hang and stop a filament for traction are combined so as to be freely opened and shut via a hinge and which is formed to be pipe-shaped by closing both sandwiching and holding bodies 2 so as to be coupled integrally by the fastening appliance. One pair of gripping and holding bodies 4 whose cross section is semicircular are installed inside both sandwiching and holding bodies 2 at the closed body 1 so as to be slidable in the length direction inside the body 1 and so as to be pressable toward the shaft core of the body 1 by respective tightening cams 14 installed at both sandwiching and holding bodies 2. Then, the fastening appliance is fitted and mounted so as not to be escapable from the inside of the body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead wire having a cam-along mainly used for laying an electric wire on a power transmission tower and a function of a retaining bracket for fastening an overhead ground wire to the steel tower. Related to fasteners.

[0002]

2. Description of the Related Art The work of suspending an overhead wire such as an electric wire between steel towers is carried out after temporarily installing the overhead wire between the steel towers in a loose state.
After fixing the overhead line to one of the towers and attaching the cam-along to the overhead line on the other tower side, pull the wire fastened to the cam-along to tension the overhead line to the specified tension, and then come-along the overhead line. The part to be further extended is cut, a retaining clamp is inserted into the cut end part and compressed, and then the end part of the overhead wire is attached to the insulator. After that, the cam-along is removed from the overhead line, and this series of operations is called tightening operation. Also, in the case of an overhead ground wire, a fastening fixture and a fastening clamp having the same structure as the above-mentioned cam-along are used, and the cam-along and the fastening bracket are attached to the overhead ground wire, and the overhead It tightens the ground wire and secures the retaining clamp to the tower.

By the way, the conventional cam-along is of a wedge type, in which a tapered pipe-shaped main body can be vertically divided into two parts, which are combined in a pipe shape and fixed by tightening bolt nuts. After opening the main body and covering the electric wire, closing the main body and tightening it with bolts and nuts, a pair of wedges with a semi-circular section taper are driven from the large diameter side of the main body to firmly grip the electric wire etc. . In addition, ears that hang wires are protrudingly provided on each divided part of the main body.

[0004]

When the above-mentioned wedge type cam along is attached to the overhead wire, both divided bodies as described above should be tightened with bolts and nuts, and the mating surfaces of both bodies should be pressed against each other. When driving a pair of wedges, it is most important that both wedges are aligned and properly driven. In particular, if there is a problem with how much the wedge is driven in, and if the amount of driving is too large, the main body of the cam along is pulled when pulling the cam along. It will slip deeply into the wire, resulting in excessive tightening of the wire, and adversely affecting the wire. On the other hand, if the amount of hammering in is small,
Since the amount of wedge slip-in decreases and the gripping force of the wire weakens, sometimes the cam-along may come off the wire and cause an accident resulting in personal injury.Be careful when driving the wedge, and it is dangerous. There was a problem that I had to rely on the engineer who did it. Furthermore, the conventional one is made of steel and is very heavy, and there is a danger of handling it in high places, and it was necessary to always carry out inspection management to prevent rust or metal fatigue. .

The present invention has been developed for the purpose of facilitating the installation work at a high place, by being able to tighten and attach to an overhead wire without excess or deficiency without particularly relying on a skilled person among the above problems. It was done.

[0006]

According to a solution of the present invention, a pair of right and left holding bodies provided with a locking portion for hanging a towing line or the like is openably and closably combined via a hinge, and both holding bodies are connected. A pair of grippers, each of which has a semicircular cross-section, is formed in the two holding bodies of the closed body, and the body is formed into a tubular shape by being closed and integrally connected with a fastener. It is slidable, and is provided so that it can be pressed toward the shaft center of the main body by the tightening cams provided on both holding bodies, and is fitted so that it cannot be removed from the inside of the main body.

The gripping body is longer than the length of the holding body in the longitudinal direction, has a collar at each end, and has a through hole having a diameter larger than that of the guide pin penetrating the guide pin implanted in the holding body. ,
It is preferable that the grip body is provided so as to be slidable and movable toward the axis, and that the grip body is not disengaged from the grip body. Further, it is preferable to apply an urging force by a spring to the tightening cam in a direction in which the grip body presses the shaft center of the main body.

[0008]

[Function] To attach the main body to the overhead wire (including the electric wire and the overhead ground wire), simply open the sandwiching body and cover the overhead wire between both gripping bodies, then close the sandwiching body and connect them with the fasteners. ,
The installation work is completed. Therefore, by pulling the tow line hanging on the locking part, the holding body moves slightly with respect to the gripping body so as to tighten the amount of play between the gripping body and the overhead wire, but this movement causes the tightening cam to move. Since the gripping bodies are pressed toward the center portion, both gripping bodies can be reliably held between the overhead wire and the overhead wire. The cable is not limited to the overhead line, but can be applied to a communication cable.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to FIGS.
As shown by, a pair of holding bodies 2 and 2 formed in a gutter shape having a semicircular groove on the inner surface are connected via a hinge 3 so as to be closed in a tubular shape, and a main body 1 and a tubular body. Formed of a pair of semicircular gripping bodies 4 and 4 which are obtained by vertically dividing a cylindrical body fitted in the main body 1 that is abutted in a circular shape, and the length of the gripping body 4 is longer than the length of the holding body 2. In addition, semicircular collars 5 and 5 are provided at both ends of each gripping body 4 and 4.

On both holding bodies 2 and 2 of the main body 1, there are ears 6,
6 is projected on the side opposite to the attachment part of the hinge 3,
Several fasteners 9 consisting of bolts 7 and nuts 8 are provided across the ears 6, 6. The bolt 7 of the fastener 9 is rotatably supported on one ear 6 and the other ear 6 is provided with a groove 10 into which the bolt 7 is fitted. By tightening the nut 8 engaged in the groove 10 and screwed into the tip of the bolt 7 toward the outer surface of the ear 6 having the groove 10, the two holding bodies 2 and 2 are connected in a tubular shape. Also, loosen the nut 8 and the bolt 7 into the groove 10.
Both holding bodies 2 and 2 can be opened by tilting them so that they can escape more.

Further, the gripping bodies 4 and 4 are fitted in the respective holding bodies 2 and 2, and the brim 5 of each of the gripping bodies 4 and 4 is the holding body 2.
The guide pin 12 having a diameter smaller than that of the through hole 11 is inserted into the through hole 11 facing the end surface of the holding body 2 and opened in the collar 5. Therefore, the grasping body 4 is slid in the longitudinal direction with respect to the holding body 2, and the through hole 11 is provided with the guide pin 12.
Since it has a larger diameter, the gripping body 4 is attached so as to be movable in the axial direction from the state in which the gripping body 4 is in close contact with the inner surface of the holding body 2.

Further, a set of a pair of brackets 13, 13 facing the outer peripheral surface of each holding body 2, 2 is provided at the front and rear portions in the longitudinal direction, and the tightening cam 1 is provided between the facing brackets 13, 13.
4 is pivotally supported forward and backward in the longitudinal direction, and the tip of the cam 14 projects into the main body 1 through a hole 15 opened in the holding body 2 to form an outer peripheral surface of the gripping body 4. It is installed in pressure contact with. Further, one pair of both brackets 13, 1 of the pair of brackets 13, 13 provided at the front and rear
The pin is provided between the three pins, and the locking portion 16 for hooking the pulling wire W on the pin is provided.

By the way, the surface of the tightening cam 14 which comes into contact with the gripping body 4 is formed as a cam surface which forms an arcuate surface which is drawn by a core which is eccentric from the support shaft core. More specifically, when the holding body 2 is towed, the locking portion 16 precedes and moves forward. Therefore, when the locking portion 16 side is described as the front (left side in the figure), the eccentric position describing the cam surface is described. Is located on the front side of the support shaft core of the cam 14, and therefore, the length from the support shaft core of the cam 14 to the cam surface is short on the rear side and gradually increases toward the front side. Further, the tightening cam 14 is biased rearward by a spring 17.

The above-mentioned main body 1, gripping body 4 and tightening cam 1
The main members such as 4 are preferably forged products such as aluminum alloy or high strength steel, or molded with carbon fiber,
The material makes it possible to reduce the weight and facilitates handling in high places. Further, the number of the tightening cams 14 is not limited to two on each side as shown in the drawing, and when the thickness of the overhead wire and a large tightening force are required, the tightening cams 1
Although the same number of 4 is provided on each side, two or more tightening cams 14 are provided on each side.

With the above structure, the main body 1 is formed in a size having a diameter according to the thickness of the overhead wire, and when performing a tight line work, the main body 1 is designed according to the thickness of the overhead wire. The main body 1 having a size is selected and used. To attach the main body 1 to an overhead wire temporarily erected between steel towers, both holding bodies 2, 2
4 is sandwiched between the overhead wires W in the open state as shown in FIG. 4 to close the two holding bodies 2 and 2, and the nuts are tightened to complete the installation. Therefore, as shown in FIG. 3, when the pulling wire Y hung on the two holding bodies 2 and 2 is pulled, the tubular body 1 is slightly moved forward with respect to the gripping bodies 4 and 4. In accordance with the operation, each gripping body 4, 4 is pressed by each tightening cam 14 toward the axis of the overhead wire, and in particular, in the embodiment in which the spring 17 is applied to the tightening cam 14. If so, the pressing action is surely performed, so that the overhead wire can be more reliably and strongly held by both gripping bodies 4 and 4. After that, pull the towing wire further to attach the aerial wire to a predetermined degree of tension, then cut the aerial wire extending to the front side of the main body 1 and attach it to the end of the aerial wire that has been cut. The cam along body 1 is removed by fastening the insulator to the insulator via a retaining clamp.

In the case of an overhead ground wire, the main body 1 is attached to the overhead ground wire.
And the retaining clasps are installed in a row in front and back, and after attaching the overhead ground wire by the body, the retaining clasp on the rear side is fastened to the tight line plate on the steel tower side, and the other body is removed. .

[0017]

According to the overhead wire fastener according to the present invention,
A tubular body is divided into two parts via a hinge, and a gripper having a semicircular cross section is inserted into each main body that can be closed in a tubular shape by a fastener. It is slidable and movable toward the axis of the main body, and is provided so as not to come off the main body, and each holding body is provided with a tightening cam that presses the gripping body toward the axis. When installing on the overhead wire, the main body is divided into two parts, the main body is closed so that the overhead wire is sandwiched between both gripping bodies, and the fastener is tightened to complete the installation. Moreover, since both gripping bodies are pressed toward the axis of the main body by the tightening cam by pulling the main body, the overhead wire can be reliably held.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing an overhead wire fastener according to the present invention.

FIG. 2 is a transverse sectional view of the same.

FIG. 3 is a perspective view showing the main body of the overhead wire fastener according to the present invention in a closed state.

FIG. 4 is a front view showing the same state where the main body is opened.

[Explanation of symbols]

 1 Main Body 2 Holding Body 3 Hinge 4 Grip Body 5 Collar 9 Fastener 11 Through Hole 12 Guide Pin 14 Tightening Cam 16 Locking Part 17 Spring

Claims (3)

[Claims] 1. A locking portion (1) for hooking a pulling wire or the like.
6) A pair of right and left holding bodies (2) provided with 6) are openably and closably combined with each other through a hinge (3), both holding bodies (2) are closed and integrally connected with a fastener (9). The main body (1) comprises a main body (1) formed into a tubular shape by means of a pair of gripping bodies (4) each having a semicircular cross section in the two holding bodies (2) of the closed main body (1). It is slidable in the longitudinal direction and can be pushed toward the shaft center of the main body (1) by each tightening cam (14) provided on both holding bodies (2) and escape from the main body (1). An overhead wire fastener characterized by being immovably fitted. 2. The gripping body (4) is longer than the length of the holding body (2) in the longitudinal direction, and has a collar (5) at each end, and the holding body (2) is attached to each of the collars (5). ) Larger diameter through hole (11) than the guide pin that penetrates the guide pin (12)
The overhead wire fastener according to claim 1, wherein the fastener is provided. 3. The tightening cam (14) is provided with an urging force by a spring (17) in a direction in which the grip body (4) presses toward the axis of the main body (1). The overhead wire fastener according to claim 1 or 2.