| 摘要 |
PURPOSE:To exactly fix a leg rack and a working platform by moving a stopper block with stopper pins to be fitted into the toothed portion of a leg rack vertically and back and forth by means of upper and back jacks provided in the side holding grooves of the working platform. CONSTITUTION:The stopper pins 2a and 2b of a stopper block 1 are coupled with the tooth portion of a leg rack D to hold the position of a working platform A. If a coupling error arises between the stopper pins 2a and 2b and the leg rack D, they are moved vertically by an upper jack 5 and back and forth by a back jack 10 for adjustment. The upper jack 5 is turned by the engagement of a gear 8 and a spur gear 9 driven by a motor 7 and moved vertically by sliding and twisting actions between the gears 8 and 9. Also, the back jack 10 is turned by the engagement of a gear and a spur gear 13 driven by a motor 11 and the stopper block 1 is moved in the front and rear directions. |
