| 摘要 |
A falling down-preventive cable is provided in addition to a lifting cable, with the intermediate portion of said falling down-preventive cable being wrapped a plurality of turns around a drum or pulley provided in a lifter, and brake means for said drum or pulley is held inactive during normal operation by the weight of the lifter, thereby permitting the up and down movements of the lifter. Upon breakage of the lifting cable, the brake means is actuated to control the rotation of the drum or pulley and henceforth said falling down-preventive cable prevents the lifter from falling down. Other advantages and details of the construction will be made clear.
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