JPH0441691Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Field of industrial application The present invention relates to a wire tensioner used for tensioning electric wires between utility poles.

(2) Prior art A wire tensioner in which one end of a hydraulic cylinder is attached to the arm of a telephone pole and a wire gripper for grasping the electric wire is attached to the other end of the hydraulic cylinder is described in, for example, Japanese Utility Model Application Publication No. 159808/1983. This is conventionally known.

(3) Problems that the invention aims to solve However, in the conventional wire tensioner, the electric wire is stretched by reducing the size of the hydraulic cylinder attached to the arm of the utility pole and moving the wire gripper attached to the hydraulic cylinder. In order to tie a main power cable to a utility pole on both sides, attach a wire tensioner to each side of the arm attached to the pole, and use these wire tensioners to tension the wires on both sides, centering on the utility pole. Alternatively, use one wire tensioner to stretch and hold the wires on one side around the pole, then change the wire tensioner and tension the wires on the other side. The wire must be tied down, which makes the work complicated, and there is a problem in that the cross arm bends when the wire tensioning work is carried out using a single wire tensioner.

(4) Means for Solving the Problems In order to solve the above problems, the present invention provides a pair of sheaves that are detachably attached to the arms of utility poles.
2 and 13, a cylinder with a rod extending downward and retractable from the bracket and a sheave 11 at the tip of the rod, and a U-shaped sheave 11 guided by the sheaves 12 and 13. It is equipped with a belt wrapped around the belt, and wire grippers attached to each end of the belt.

(5) Effect With the above configuration, when the bracket is attached to the arm of the utility pole, and the wire grippers attached to both ends of the belt are attached to the wires on both sides with the utility pole as the center, and the cylinder is extended, the belt will extend the cylinder. The wire grippers are simultaneously pulled toward the utility pole, and the wires on both sides of the utility pole are tensioned at the same time with the same tension.

(6) Examples Examples of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, in the aerial work vehicle, the base end of a telescoping boom 4 is pivotally supported on a turntable 3 provided on a vehicle body 1 supported by outriggers 2.
The telescopic boom 4 is extended and contracted by a telescoping device (not shown), and is also raised and lowered by the extension and contraction of the undulating cylinder 5. A work platform 6 is held in balance at the tip of the telescopic boom 4, and a control device is installed inside the work platform 6. 7 is provided, and this control device 7 is connected to a wire tensioner 8.

As shown in FIG. 1, the wire tensioner 8 includes a bracket 9 that is detachably attached to the arm 18 of the utility pole 17 and has protrusions 91 and 92 that protrude on both sides of the arm 18, and a bracket 9 in the center of the bracket 9. A hydraulic cylinder 10 is pivotally supported at one end and telescopically suspended from a bracket 10 with a rod pointing downward, and a hydraulic cylinder 10 is rotatably supported on the rod tip of the hydraulic cylinder 10 and protrusions 91 and 92 of the bracket 9, respectively. A belt wrapped around the sheave 11 pivoted at the tip of the hydraulic cylinder 10 in a U-shape, guided by the sheaves 12 and 13 pivoted on the protruding parts 91 and 92 of the bracket 9, respectively. 14, and wire grippers 15 and 16 that are attached to both ends of this belt 14 and grip the wires to be stretched.
When the belt 14 is slack, it opens and the electric wire 19
The hydraulic cylinder 10 is configured to close and grip the electric wire 19 when tension is applied to the belt 14 without gripping
As shown in FIG. 2, the oil chambers on the extension side and the contraction side are removably connected to a control device 7 through hydraulic hoses 20 and 21, respectively, and the hydraulic cylinder 10 expands and contracts by controlling the control device 7.

With the above configuration, when performing wire tensioning work on both sides of the utility pole 17 with the wire tensioner 8, the bracket 9 of the wire tensioner 8 is attached to the arm 18 of the utility pole 17, and the extension side and contraction side of the hydraulic cylinder 10 are The hydraulic cylinder 10 is connected to a control device 7 provided in the work platform 5 of the aerial work vehicle through hydraulic hoses 20 and 21, and the hydraulic cylinder 10 is contracted by controlling the control device 7, and is attached to both ends of the belt 14. Wire grippers 15 and 16 are respectively attached to the electric wire 19 to be stretched so as to grip the electric wire 19, and the control device 7 is controlled to extend the hydraulic cylinder 10. As the hydraulic cylinder 10 expands, both ends of the belt 14 are pulled toward the center, and the wire gripper 1
5 and 16 respectively grip the electric wire 19 on both sides of the utility pole 17, and the wire grippers 15 and 16 each pull the electric wire 19 toward the utility pole 17 with a tension equivalent to 1/2 of the output of the hydraulic cylinder 10. Therefore, the wires 19 on both sides of the utility pole 17 are simultaneously stretched with the same tension. After the electric wire 19 is stretched and fastened to the arm 18 etc., the control device 7 is controlled to reduce the hydraulic cylinder 10 to reduce the belt 14.
is loosened, and the wire 19 is released from the wire grippers 15 and 16.

(7) Effects of the invention As described above, according to the invention, there is provided a wire tensioner that can tension electric wires extending on both sides of a utility pole at the same time and with the same tension, with a simple structure.
The present invention is effective in improving the efficiency of wire tensioning work.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of a wire tensioner, and FIG. 2 is a side view of an aerial work vehicle that performs wire tensioning work. 8... Wire tensioner, 9... Bracket, 10... Hydraulic cylinder, 11, 12, 13... Sheave, 14
... Belt, 15, 16 ... Wire gripping device.

Claims (1)

[Scope of utility model registration request] A bracket that is detachably attached to the arm of a utility pole and has a pair of sheaves 12 and 13; a cylinder that is telescopically suspended from the bracket with a rod facing downward; and a sheave 11 provided at the tip of the rod; A wire tensioner comprising a belt guided by wires 12 and 13 and wound around a sheave 11 in a U-shape, and wire grippers attached to both ends of the belt.