present invention, a pedestal for supporting, are located in said base, a detection unit for detecting the direction of movement of the winch pulling rope, is located in said base, and a brake unit which is coupled to the detection unit the detection unit, when detecting a reverse movement of the winch pulling rope, is operated triggering the brake unit to provide a back prevention device for locking the winch pulling rope to the brake unit. The present invention automatically detects the direction of movement of the winch pulling rope, and when the reverse movement of the traction rope has occurred, engaged in a timely manner, by preventing the occurrence of situations such as back, back it is possible to avoid each type of accident by.FIELD 1
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