Contractible handcuff

Claim 1

A contractible handcuff comprising a body composed of a left body component and a right body component, in which a reel, a motor, a battery, a conductor and a back cover are positioned in order, a hand gripping recession surface is designed on the outer surface, a hook and a control switch are incorporated on it, and the motor has a gear incorporated at its driving shaft to engage with a gear at the reel having a take-up drum to take up a handcuff, an U-like guide at the front end of the body to guide extension of the handcuff and to maintain the handcuff to extend straightly; a handcuff made of thin flexible metal tape with slightly curved cross section, winding around the reel normally, having a locker made of permanent magnet exposed outside the body and with a hook corresponding to some slots at the lower part, a ratchet at a side of the hook, a locking device composed of a stub, a latch and a spring arranged on the locker's spindle at a side of the locker, a protective edge at each lateral side, and a plurality of slots forming stopper between each two consecutive slots on the slightly curved cross-sectional surface for securing of the hook, and a chain connected to the handcuff by means of pins; characterized by the handcuff structure which can bend and bind any substance it touches immediately while it is extended, and has its locker attracted the handcuff, its hook to be firmly held by a stopper formed between two slots by inertia force, and secured thereto by the locking effect between the latch and the ratchet on the hook.