Patent ID: 7975987

Claim:
A wire-twisting prevention device of a lifting reel with a four-line wire structure, the device comprising: a fixed body fixed to a ceiling of a structure; first and second drums installed to the body at a predetermined interval and rotated by a driving motor; wires respectively connected to the first and second drums; and first, second, third and fourth guide rollers arranged on a top of a lifting body at regular intervals and suspended on the wires to form a four-line wire; a guide tube having a predetermined length and having a moving space formed therein; a body inserted into the guide tube to be movable along the guide tube; and slow sensors respectively installed to both sides of the guide tube to be spaced apart from the body by a predetermined distance, wherein the slow sensors detect that the body moves in one direction, and then the slow sensors make a drum, to which the body approaches, be operated slowly; wherein the wire-twisting prevention device is installed between an end of the wire connected to the first drum and an end of the wire connected to the second drum so as to connect both wires with each other; wherein the wire-twisting prevention device includes bearings installed to the ends of the wires to be rotatable, respectively; wherein the bearings prevent the wires from being twisted while the wires are wound around or unwound from the drums.