| 摘要 |
PURPOSE:To enable a transfer with a small driving force as well as to decrease a space required by installing two heavy metalshutters at both sides of a wire hung up on a pulley. CONSTITUTION:Metal shutters 19, 20 are connected to a loop wire or chain 41 and the wire 41 is hung up with the upper and lower pulleys or sprockets 42, 43. Therefore, each weight of shutters 19, 20 is in a ballanced state. But, with transferring a breaker 11 to left, each opening of disconnecting switches 16, 17 of a main circuit is closed respectively with the shutter 19, 20. And, with transferring the breaker 11 to right, the shutter 19, 20 opens the disconnecting switch 16, 17 of the main circuit. |
