| 摘要 |
<p>PURPOSE:To enable line extension without applying excessive tension by passing a drawing rope and a coupling rope, at each supporter position of a messenger wire, through a guide body at a certain interval from the messenger wire. CONSTITUTION:When a shifting roller A passes a messenger wire supporter C, the front-side pressing plate 14 of an opening/closing door 11, which is provided between the end of the shaft 2 of the roller A and the end of an arm 5, hits on the pushing arm 42 of the supporter C, and the pressing plate 14 is pressed, whereby the movable locking piece 12 of the opening/closing door 11 draws back into the opening/closing door 11, and gets out of a pin 13 at the end of the arm 5, and the lock is released, and the opening/closing door 11 is further pushed by a pushing arm 42 and rotates around the shaft 2 and goes over the pushing arm 42. Thereafter, the opening/closing door 11 rotates around the shaft 2 by dead weight and returns to its place, and the movable locking piece 12 projects from the bottom of the opening/closing door 11 by the spring force, and is locked by the pin 13. And the opening/closing door 11 is locked again in the closed conditions.</p> |
