US Patent 7316137 High visibility double lock assembly for handcuff

The handcuff assembly includes a bow pivotally connected to a cheek plate frame assembly which includes a base frame. A removable lockset assembly for locking a pawl relative to ratchet teeth on the bow and including a slideable lock bar is received in the base frame. The lock bar has a lock setting slot therethrough for receiving an actuating pin to move the lock bar from a single lockposition to a double lock position. A key receiving structure on each side of the lockset assembly is provided for receiving a key and enabling the key to turned in one direction only for first unlocking a double-lock, which prevents movement of the bow in either direction and for secondly, completely unlocking the handcuff by moving the pawl away from the bow and against a spring mechanism. The lock bar has a color that contrasts with the color of the frame of the handcuff to indicate any one of several things, such as type of lock mechanism and a status of the lock bar.