High contact conical bow
View Patent ↗The handcuff assembly includes a bow pivotally connected to a cheek plate frame assembly which includes a unitized frame that is die stamped from a metal plate and which is overmolded with a polymer overmold. The bow and arcuate cheek arms engage a wrist of a person to be restrained with an envelope of the bow being defined by a conic path with an increasing arc. The bow and cheek arms have rounded inner edge surfaces. The cheek arms have reinforcing ribs. The molded polymer covering surrounding the cheek arms provide a round on the inner edge of the cheek arms which engage a wrist. The unitized frame has interlocking tabs on folded side plates of a base frame. A flat is provided on an outer surface of the bow for lining up a point of contact with a wrist. 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. 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. A deflectable detent is provided on a lockset housing for releaseably locking the lockset assembly within the base frame of the molded cheek plate assembly. A swivel cup is fixed in the base frame of the cheek plate assembly prior to polymer overmolding and a swivel with a welded chain link mounted thereon and has a swivel pin which is received in the swivel cup.
1. In a handcuff assembly for use in a pair of handcuffs wherein each handcuff assembly comprises a bow pivotally connected to and between cheek plates of a cheek plate assembly that also includes a base frame containing a lock mechanism, the improvement residing in said bow having an inside envelope defined by a conic path having an increasing arc so as to form an envelope for receiving various size wrists at different positions of said bow relative to said cheek plates with a minimum of pressure to the wrist.
2. The bow of claim 1 wherein said conic path is a b-spline curve generated by projection of a portion of a conic onto a flat plane.
3. In a handcuff assembly for use in a pair of handcuffs wherein each handcuff assembly comprises a bow pivotally connected to and between cheek plates of a cheek plate assembly that also includes a base frame containing a lock mechanism, the improvement residing in said bow having a first arcuate portion and a second curved portion including a tooth track portion and said first curved portion and second curved portion having an inside envelope defined by a conic path having an increasing arc so as to form an envelope for receiving various size wrists at different positions of said bow relative to said cheek plates with a minimum of pressure to the wrist.
4. In a handcuff assembly for use in a pair of handcuffs wherein each handcuff assembly comprises a bow pivotally connected to and between cheek plates of a cheek plate assembly that also includes a base frame containing a lock mechanism, the improvement residing in said bow having an inside envelope defined by a conic path having an increasing arc so as to form an envelope for receiving various size wrists at different positions of said bow relative to said cheek plates with a minimum of pressure to the wrist, said bow including a tooth track portion having teeth which ratchet with teeth on a pawl in the lockset assembly and when a last tooth on the bow engages a tooth on the pawl a minimum envelope is created with the cheek plate assembly encompassing approximately 2.8 square inches.
5. In a handcuff assembly for use in a pair of handcuffs wherein each handcuff assembly comprises a bow pivotally connected to and between cheek plates of a cheek plate assembly that also includes a base frame containing a lock mechanism, the improvement residing in said bow having an inside envelope defined by a conic path having an increasing arc so as to form an envelope for receiving various size wrists at different positions of said bow relative to said cheek plates with a minimum of pressure to the wrist, said bow including a tooth track portion having teeth which ratchet with teeth on a pawl in the lockset assembly and when a last tooth on the bow engages a tooth on the pawl a maximum envelope is created with the cheek plate assembly encompassing approximately 5.67 square inches.
6. In a handcuff assembly for use in a pair of handcuffs wherein each handcuff assembly comprises a bow pivotally connected to and between cheek plates of a cheek plate assembly that also includes a base frame containing a lock mechanism, the improvement residing in said bow having an inside envelope defined by a conic path having an increasing arc so as to form an envelope for receiving various size wrists at different positions of said bow relative to said cheek plates with a minimum of pressure to the wrist and said bow having a flat contact face for engaging the side of a wrist upon application of the handcuff to a wrist.
7. In a handcuff assembly for use in a pair of handcuffs wherein each handcuff assembly comprises a bow pivotally connected to and between cheek plates of a cheek plate assembly that also includes a base frame containing a lock mechanism, the improvement residing in said bow being a unitary, one piece, powered metal bow and having an inside envelope defined by a conic path having an increasing arc so as to form an envelope for receiving various size wrists at different positions of said bow relative to said cheek plates with a minimum of pressure to the wrist.