Patent ID: 6854562

Claim:
In a tower crane including a vertical ladder enabling an operator to move to an overhead operator cab, and a wire rope serving as safety means for the operator, a climbing safety device comprising: a wire rope winding unit installed at an upper portion of the tower crane, the wire rope winding unit including a drive motor adapted to freely rotate in a forward or backward direction, thereby winding or unwinding the wire rope, and a winch operatively connected to the drive motor; the wire rope having a ladder structure to have wires at both sides thereof, respectively, while being provided, at each side thereof, with engagement balls vertically spaced apart from one another along an associated one of the wires, the wire rope being fixed, at one end thereof, to the winch so as to be wound on the winch, and provided, at the other end thereof, with a connecting ring for connecting the wire rope to a certain body portion of the operator; and a safety unit installed beneath the wire rope winding unit, and adapted to guide a movement of the wire rope while controlling a sudden unwinding of the wire rope, the safety unit including a sensor for sensing the sudden unwinding of the wire rope.