| 摘要 |
PURPOSE:To prevent the device from damaging in case of turning a driving shaft too much when pulling out or inserting and operating switches by additionally installing a specific structure of idling device in a pull mechanism with use of toothed wheels of switches for pulling out. CONSTITUTION:In a structure in which a pull mechanism (unshown in the figure) is interlocked, and switches are inserted and drawn out by turning a worm wheel shaft 4 in the direction of C or D through engagement of a worm 2 and a worm wheel 5 in a gear box 7 by turning a head 13, a geared shaft 11 is provided on the same axis of a driving shaft 12, and the both shafts 11, 12 are coupled through a coupling 14 to be engaged with bosses 11a, 12a. An L-letter shaped slide 15 is fixed to the coupling 14, and the coupled position of the coupling 14 is given impetus by means of springs 17, 18 which are arranged on both sides of its vertical portion. On another part, the horizontal portion of the slide 15 is extended to the side of the wheel 5, and it is integrated so as to release the connection of the coupling 14 to the shaft 11 when thrusting the end of a thrust plate 19 in the semicircular shape which is installed on the wheel 5. |
