JP2000261940A - Wedge-type clamp and wedge push-in device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable both actions of pushing-in and pulling-out of a wedge through the use of a single device by fitting a wedge push-in device to arms, and enabling pushing a wedge into a clamp or to press the wedge from the opposite direction of the clamp and to make the wedge extractable. SOLUTION: A clamp 1 is fitted to a part of a loose electric wire in the rear of a temporarily fixed site, and arms 5 are turned to the iron tower side. Holes 5b of the arms 5 are connected to fitting metal fixtures K and anchored to an iron tower insulator G, and locked to an anchoring board by holes 5a. Under this condition, oil is transmitted to a cylinder C, and wedges are pushed in by a pressing board 9 to enable electric wire anchoring. After that, a come- along (A) is loosened, and tension is transferred from a wire W to an electric wire E, and the come-along is removed to finish work. When pull out of the wedges becomes necessary at a stage earlier than the removal of the come- along, anchoring of an anchoring board 6 by the arms 5 is released, a wedge push-in device is turned with right and left sides reversed and moved to the opposite side of the clamp, and the arms 5 are turned by 180 degrees and the anchoring board whose position has been changed is re-anchored. After that, the wedge is pressed from the opposite side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wedge-type clamp for retaining electric wires, and more particularly, to a wedge pushing-in device capable of both pushing and removing wedges.

[0002]

2. Description of the Related Art A hydraulic device for pushing wedges into gaps above and below a wire of a clamp for holding the wire is disclosed in Japanese Patent Laid-Open No. Hei 6-1894.
33 are known.

[0003]

However, once the wedge has been pushed in, the wedge may be pulled out and then re-pushed in due to adjustment of the wire slackness or other circumstances. In that case, since the above-mentioned reference can only be pushed in, it is necessary to prepare some other device for extracting. Since the work is performed in a high place space, there has been a long-awaited need for a clamp capable of both pushing and removing a wedge with a single device.

[0004]

In the above reference, U-shaped bearings are provided on both outer sides of the clamp, the arm is stopped on the shaft, and the other end of the arm is locked to the tower. This arm simultaneously supports the hydraulic cylinder and presses the wedge with its piston rod. However, the U-shaped bearing is a side-open type, and allows only the side locking of the arm. On the other hand, in the present invention, the U-shaped bearing is placed in the release phase in the vertical direction, and its axis is in the diameter direction of the electric wire. The arm is 180
The wedge can be pressed at one extreme point, and the wedge can be pressed on the opposite side, that is, withdrawn at the other extreme point.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a clamp 1 holds an electric wire with clamping pieces 1a and 1b having a C-shaped cross section facing each other. The wedges 2a and 2b are capable of filling the upper and lower gaps of the electric wire E. The wedges 2a and 2b are previously sandwiched with the electric wire E, tightened with bolts at the ears 2c, and the tips are inserted into the clamp. The clamp 1 has a U-shaped bearing 3 fixed at the center of both sides in a downward open phase, and a locking shaft 4 provided on the U-shaped bearing 3 locks one end of an arm 5. Axis 4
Is on the diameter line of the electric wire E, and the arm 5 is rotatable 180 degrees in the direction of the arrow on the lower surface of the electric wire E, and has two holes 5a and 5b at its ends. The arm 5 is locked to the steel tower by the hole 5b. 5 and 6 show another embodiment of the clamp 1. FIG. FIG. 5 shows that the hinge 1 is provided at the top or bottom of the opposing piece of the C-shaped cross section of the clamp 1 so that either one of the hinges can be selectively coupled to facilitate attachment to the electric wire E. FIG. 6 shows the left and right clamp pieces having the same shape that can be used interchangeably by inverting one of the opposed clamp pieces. When the left and right clamp pieces are inverted, the opening directions of the bearings are reversed with each other. However, if the rotation directions of the left and right arms are reversed with each other, there is no problem with the 180-degree rotation.
Next, in FIG. 4, the retaining plate 6 has a hydraulic cylinder C
A semicircular cut 6a that can be straddled on the electric wire E is provided at the center of the lower piece, and a cut 6b that allows the arm 5 to be inserted on both sides thereof.
Are provided respectively. The arm 5 inserted into the cut 6b is supported by the pin 7 by the hole 5a. A pressing plate 9 is fixed to an end of the piston rod 8 of the hydraulic cylinder C, and an adapter 9a is provided on the plate surface so as to be able to simultaneously press upper and lower wedges. This adapter has a U-shape that can be inserted into the electric wire E, and presses an upper wedge at a bent portion and a lower wedge at both leg ends.

[0006]

FIG. 7 shows a case where the electric wire E is extended through a steel wheel (not shown) for stopping a steel tower and temporarily fixed by a cam-along A. Attach the clamp 1 to a part of the slack electric wire behind the temporary fixing point, rotate the arm 5 toward the tower,
b is connected to the mounting bracket K and stopped on the insulator G of the steel tower.
It is locked to the retaining plate 6 by a. In this state, the oil is fed to the cylinder C, the wedge 2 is pushed by the pressing plate 9, and the electric wire can be stopped by the clamp. Then, the cam-along A is loosened to transfer the tension from the wire W to the electric wire E, and the cam-along is removed to complete this work. If it is necessary to remove the wedge at a stage before the removal of the cam-along, the locking of the locking plate 6 by the arm 5 is released, and the wedge pushing device of FIG. Numeral 5 re-locks the locking plate rotated 180 degrees and repositioned. Then the wedge is pressed from the opposite side. However, in the case of FIG. 6, the arms 5 are turned 180 degrees to opposite sides as described above. If the tip of the wedge is hidden in the clamp, the adapter 9a may be pressed with an appropriate distance piece.

[0007]

As described above, wedges are all operations in a high space, as described above. Preparing another set of equipment for sampling and arranging it on the opposite side of the wedge was an unbearable labor for workers. The present invention rationalizes this point, and is characterized in that one set of pushing devices can be diverted to extraction.

[Brief description of the drawings]

FIG. 1 is a side view of a clamp.

FIG. 2 is a plan view of upper and lower wedges.

FIG. 3 is a perspective view of a clamp.

FIG. 4 is a perspective view near a cylinder.

FIG. 5 is another embodiment of the clamp.

FIG. 6 is another embodiment of a clamp.

FIG. 7 is an operation explanatory view of the present invention.

[Explanation of Signs] 1 Clamp 2a, 2b Wedge 3 U-shaped bearing 4 Lock shaft 5 Arm 6 Lock plate 7 Pin 8 Piston rod 9 Press plate 9a Adapter C Hydraulic cylinder A Cam-Along G Insulator W Wire E Wire K Mounting bracket

Claims (3)

[Claims] 1. A clamp for holding an electric wire by opposing C-shaped cross-section pieces, a pair of wedges which are inserted into upper and lower gaps between the clamp and the electric wire and which can fix both by pushing, and are fixed to the center portions on both sides of the clamp. A U-shaped bearing having a shaft that is opened downward or upward, and a pair of arms each having one end supported by the shaft and capable of rotating the clamp lower surface or upper surface by 180 degrees and the other end being locked to a steel tower, A wedge-type clamp, wherein a wedge pushing device is mounted on the arm so that the wedge can be pushed into the clamp or pressed out from the opposite direction of the clamp so that the wedge can be removed. 2. The wedge-type clamp according to claim 1, wherein the top or bottom of the C-shaped section facing piece is a clamp capable of being hinged. 3. A hydraulic cylinder is fixed at right angles to the plate surface at the upper center of the rectangle, a semicircular cut corresponding to the electric wire is inserted at the center of the lower piece, and the arm according to claim 1 is inserted at both sides thereof. A locking plate provided with notches that can be locked, a pressing plate fixed to the piston rod end of the cylinder and facing the wedge end, and an adapter fixed to the pressing plate surface and capable of simultaneously pressing upper and lower wedges. The wedge pushing device according to claim 1 or 2, wherein