Patent ID: 8156771

Claim:
Disposable handcuffs comprising: a flat strap of flexible material including a central section, two outer sections and two loop sections between said outer sections and said central section; a box for locking the flat strap therein having a first side, a second side and a pair of passages for receiving the flat strap for longitudinal motion within the passages, the ends of the outer sections extending from the passages on the first side of the box and the loop sections extending from the passages on the second side of the box; a fixing element able to fix the central section on the box; each of the passages having a strap supporting wall and an opposite partially offset wall forming a cavity between said walls open to the first side of the box; a rotational body located within each of the cavities for contact of the rotational surface thereof with the offset wall on one side and the flat strap on the other side; a boss including a sharp end formed as a tip extending from the rotational surface to engage the flat strap in the area adjacent to the first side of the box and to protrude inside the flat strap to a position where the tip leans against the strap supporting wall; and a cover fixed on the first side of the box and overlapping the cavities.