JP4121081B2 - Cam Along for securing overhead wires - Google Patents

Description

  The present invention relates to an operation of replacing an existing overhead ground wire with an optical fiber composite overhead ground wire during an operation of removing or connecting the overhead ground wire or the optical fiber composite overhead ground wire from the steel tower of the steel tower. The present invention relates to an overhead wire retaining cam along for temporarily attaching an overhead wire or the like.

In order to remove an existing overhead ground wire or to keep a new optical fiber composite overhead ground wire, temporarily hold it on a cam-along coupled to a steel tower, temporarily remove the tension, and then perform removal or retention work. The conventional cam along includes a split wedge member that grips the electric wire, a split cam along main body into which the wedge member is inserted, and an arm that is integrally coupled to the cam along main body. The outer peripheral surface of the wedge member is formed in a tapered shape, and the inner peripheral surface of the cam along body is also formed in a tapered shape corresponding to the outer peripheral surface of the wedge member. When the wedge member into which the electric wire is inserted is attached to the cam along body and the arm connected to the steel tower via the wire is pulled, the wedge member is drawn into the cam along body along the taper surface, and the electric wire is strongly tightened and gripped. . The split cam along body is hinged on one side, and the other side is configured to be openable and closable.
Japanese Patent Application Laid-Open No. 07-177626

  In the conventional cam along, the cam along main body and the wedge member are separated, and after setting the electric wire on the wedge member, the wedge member is set on the cam along main body and the cam along the main body is held between them. Because of this structure, there is a risk of detaching and falling when working on the tower, and there is a risk of hitting the insulators that hold the transmission line located below and causing damage to workers.

In order to solve the above problems, in the present invention, a clamp having an arm 2 for connecting a wire W coupled to a power transmission tower T and a pair of opposing clamping pieces 3a and 3b for receiving and holding an overhead wire G inside. 3 is connected to the first and second links 4 and 5. By the relative movement in the extending direction between the arm 2 and the clamp 3, the clamping pieces 3a and 3b of the clamp 3 can be opened and closed. One end of the first link is pivotally attached to one clamping piece 3a located on the arm side, one end of the second link is pivotally attached to the other clamping piece 3b, and an intermediate portion is clamped to one It is pivotally attached to the piece 3a. The pivot 8 that pivotally supports the second link on one clamping piece 3a , the pivot 8 that pivots on the other clamping piece 3b, or the pivot 9 that pivots on the arm 2, for example, the pivot 9 is A long axis extending a predetermined length from the second link 5, the second link 5 is moved on the long axis 9 between a closed position approaching the clamp 3 and an open position away from the clamp 3. The ends of the other two pivots 8, 8 are detachable with respect to the second link 5, and when the second link 5 is in the closed position, the two pivots 8, 8 When engaged, the second link 5 is configured to come out of the two pivot shafts 8 and 8 to form a gap between the clamp 3 when the second link 5 is in the open position. When the second link 5 is in the open position, the overhead wire G can be inserted between the sandwiching pieces 3 a and 3 b through the gap between the second link 5 and the clamp 3 .

  In the present invention, since the entire tool is always integrated and the components are not separated, it is possible to prevent the parts from falling during the tower operation for setting the overhead wire, and to prevent the breakage of the insulator series, etc. In addition, the safety of workers and the like can be improved.

An embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, in the work of replacing the existing overhead ground wire G stretched on the transmission tower T with the optical fiber composite overhead ground wire, the overhead ground wire G is removed from the steel tower T during the work of removing the overhead ground wire G from the insulator series. Temporarily secure it separately with Cam Along 1 and leave the tension once. The cam along 1 includes an arm 2 coupled to a wire W coupled to the steel tower T, a clamp 3 that holds the overhead ground wire G, and front and rear links 4 and 5 that couple the clamp 3 to the arm 2.

  As shown in FIGS. 2 to 5, the arm 2 extends substantially along the extending direction, and has a handle 2 a for connecting a wire W connected to the steel tower T at one end thereof.

  The clamp 3 includes a pair of opposing sandwiching pieces 3a and 3b each having an arcuate groove 3c in the longitudinal direction for receiving the overhead ground wire G inside.

  The link 4 has a pair of left and right so as to sandwich the arm 2 and the clamp 3 from both sides, and one end is connected to the arm 2 and the other end is rotatably connected to one holding piece 3a of the clamp 3 by a bolt 6 and a nut 7, respectively. Yes.

  The link 5 is pivotally attached to the arm 2 at a distance from the link 4 in the front-rear direction. The link 5 has a substantially U-shape with an intermediate portion bent, and includes a pair of left and right link pieces 5a and 5b sandwiching the arm 2 and the clamp 3 from both sides. One end of each of the link pieces 5a and 5b is pivotally supported on the arm 2 by a pivot 8, the middle part is pivotally supported by a long pivot 9, and the other end is pivotally supported by a pinch 8b by a pivot 8. Is done. The long pivot 9 extends laterally, and the link piece 5b on the opposite side of the arm 2 can move on the long pivot 9 so that an aerial ground wire G can be inserted between the clamping pieces 3a, 3b of the clamp 3. It can be arranged away from the clamp 3. The link piece 5b can be positioned by a wing nut 10 screwed onto the long shaft 9. Both end portions of the link piece 5b are removably inserted into the pivot shaft 8.

In this cam along 1, the wire W connected to the steel tower T is coupled to the puller 2a, and the overhead ground wire G stretched on the steel tower T is gripped by the clamp 3 and temporarily fixed. If the clamp 3 loosens the wing nut 10 and moves the link 5b to the side on the long pivot 9 and then comes out of the pivot 8, the clamp 3 can be spaced from the clamp 3, as shown in FIGS. Since it can do, the overhead ground wire G can be inserted between the clamping pieces 3a and 3a. At this time, the wing nut 10, the long pivot 9 and the link 5b are not separated from the other members, and the cam along 1 is maintained integrally and there is no part to be detached. When the overhead ground wire G is disposed in the clamp 3, the pivot 8 is inserted into the link 5 b and the clamp 3 is applied, and the butterfly bolt 10 is tightened, the overhead ground wire G is held without being detached from the clamp 3. If the wire W is pulled from above the steel tower T in this state, the clamping pieces 3a and 3a of the clamp 3 which are shifted in the extending direction and are alternately arranged are clamped by the links 4 and 5 along with the movement of the wire W of the arm 2. The pieces 3a, 3a approach each other in the axial direction and the interval direction, and hold and hold the aerial ground wire G between them strongly. Therefore, as the tension of the overhead ground wire G increases, the clamp 3 grips the overhead ground wire G more strongly. Since the overhead ground wire G stretched on the steel tower T is entrusted with tension on the cam along 1 side, it can be removed from the insulator series.
The long pivot 9 pivotally attaches the link 5b to the clamping piece 3a of the clamp 3. However, instead of this, the other pivot 8 is configured to be long and the link 5b is connected to the other clamping piece 3b or the arm 2. You may comprise so that it may hold | maintain.

  In the cam along according to the present invention, not only the work of replacing the existing overhead ground wire with the optical fiber composite overhead ground wire, but also the overhead wire such as the wire to be extended is connected to the wire connected to the steel tower and temporarily fixed to the steel tower. Can be widely applied when

It is a front view of the use condition of the cam along which concerns on this invention. It is a perspective view of a cam along. It is a front view of a cam along. It is a top view of a cam along. It is a side view of a cam along. It is a front view of the cam along with the clamp opened. It is a side view of the cam along with the clamp opened.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cam along 2 Arm 3 Clamp 3a Clamping piece 3b Clamping piece 4 Link 5 Link 5a Link piece 5b Link piece 9 Long pivot 10 Wing nut T Power transmission tower G Overhead ground wire W Wire

Claims (2)

An arm for connecting wires coupled to the transmission tower;
A clamp with a pair of opposing clamping pieces that receive and hold an overhead wire inside;
The arm and the clamp are connected, and the arm and the clamp are arranged apart from each other in the extending direction so as to open and close the clamp clamping pieces by relative movement in the extending direction, and one end is connected to the clamp and the other end An overhanging cam-along comprising first and second links pivotally attached to the arms, respectively .
One end of the first link is pivotally attached to one of the clamping pieces located on the arm side of the clamp,
One end of the second link is pivotally attached to the other clamping piece of the clamp, and an intermediate portion is pivotally attached to the one clamping piece,
At least one of the pivot that pivotally supports the second link to one of the sandwiching pieces, the pivot that pivotally supports the other sandwiching piece, or the pivot that pivots to the arm is predetermined from the second link. A long axis extending in length, and holding the second link movably between a closed position close to the clamp and an open position away from the clamp on the long axis; The end of the pivot is detachable with respect to the second link and engages the two pivots when the second link is in the closed position and the two links when the second link is in the open position. Configured to exit from the pivot and form a gap with the clamp;
An overhead wire retaining cam along characterized in that an overhead wire can be inserted between the holding pieces through the gap between the second link and the clamp when the second link is in the open position . The wing nut is screwed onto the long shaft, and the second link can be positioned in a closed position and an open position by changing a screwing position of the wing nut. Cam Along for securing overhead wires as described in 1.

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