Abstract: A handcuff comprising a bolt and a bolt spring which work to double lock the handcuff. The bolt comprises an underside having teeth which are engagable with the teeth of a jaw. The underside of the bolt comprises a groove through which a stud disposed on a cheek head of the handcuff is positioned to thereby further secure the bolt in position when the handcuff is locked. The bolt further comprises an upper side comprising a groove, a spring stop, and a detent. The bolt spring comprises a body bent to form a side wall which bridges a first spring leg portion to a second spring leg portion, wherein the first and second spring leg portions engage with the upper side of the bolt to hold the bolt spring in a first position. The spring stop prevents the bolt spring from over-rotation, and therefore, prevents breakage of the bolt spring.

Abstract: A handcuff comprising a bolt and a bolt spring which work in combination to double lock the handcuff. The bolt comprises an underside having teeth which are engagable with the teeth of a jaw. The underside of the bolt further comprises a groove through which a stud disposed on a cheek head of the handcuff is positioned to thereby further secure the bolt in position when the handcuff is locked. The bolt further comprises an upper side comprising a groove, a ridge, and a detent. The bolt spring comprises a body bent to form a side wall which bridges a first spring leg portion to a second spring leg portion, wherein the first and second spring leg portions engage with the upper side of the bolt to hold the bolt spring in a first position.

Abstract: A restraint locking mechanism provides a double-radiused, double-rounded spring for biasing the bolt toward the jaw, and for resisting movement of the stop when the stop is in the double lock position. The resistance provided by the double-radiused, double-rounded spring to movement of the stop increases to a maximum level of resistance as the stop is moved toward the single lock position, and then decreases, as contrasted with providing maximum resistance at the beginning of the stop's movement, and no resistance thereafter. The double-radiused, double-rounded spring design provides for improved fatugue resistance in the spring.

Abstract: In a handcuff device of the double locking type having a latch with inclined teeth which allows the locking arm of the cuff to rotate about and enclose the wrist and hold the locking arm in place around the wrist and having a bolt behind the latch that is slideable under the action of an externally actuated drift pin over the latch to a locking position that locks the latch against the locking arm preventing movement of the locking arm in either direction. The unintentional movement of the bolt into its locking position is prevented by providing a restraining means--a spring loaded pin--that operates against the casing and the bolt to resiliently urge the bolt against the latch and against the spreading action of mating shoulders on the bolt and latch that cause the two to spread apart against the action of the restraining means as the bolt moves forward towards the locking position and the shoulders engage.