HEAVY LOAD HANG-DOWN DEVICE

PROBLEM TO BE SOLVED: To provide a heavy load hang-down device capable of lifting or hanging down a heavy load safely by using two wires and holding a stop position of the lifting and hang-down of the heavy load even if an operation for switching the rotation regulation direction is not performed.SOLUTION: Because two wires drawn from both drums are used for the lifting or hang-down of a heavy load, compared with the case of one wire, the rotation and vibration of the heavy load during the lifting and hang-down are reduced, and the heavy load can be lifted or hung down safely. Moreover, because a worm gear power transmission mechanism with a self-lock function is established between a driving shaft and an input axis of an external force, the hang-down of the heavy load or the stop position of the hang-down can be maintained without performing the operation for switching the rotation regulation direction.