| 摘要 |
<p>PURPOSE: To keep electric-wire tension force in a given range, by providing a horizontally expanding/contracting hydraulic cylinder and a pair of tube- shaped supporting rods almost linearly in a body between both ends of a valve gear unit for controlling delivery pressure of a hydraulic pump. CONSTITUTION: An electric-wire tension tool 11 includes a main valve gear unit 13 at a center thereof and a pair of tubular supporting bodies 31 elongated linearly to both sides. A cylinder 33, a piston 35, a hydraulic cylinder 38, and a wire holding unit 39 are provided at an end part of the left supporting body 31. A sealed oil chamber 37 is constituted by a left end face and the inner circumferential face of the cylinder 33, and a piston head 35a of the piston 35. A hydraulic cylinder 38 and the wire holding unit 39 are provided at an end part of the right supporting body 31, in which an oil tank 41 connected to the main valve gear unit 13 is provided. A rechargeable oil pump 42 is connected through the main valve gear unit 13 with the oil tank 41 and a pipe 40 extended to the oil chamber 37. Then, the tensile force between the wire holding units 39 are kept in a desired given range, and the replacement of a new electric wire or the removal and setting work of the electric wire between old and new poles is carried out safely.</p> |
