Locks – Operating mechanism – Key
Patent
1995-04-18
1997-03-18
Boucher, Darnell M.
Locks
Operating mechanism
Key
70495, 70496, E05B 1516
Patent
active
056112254
ABSTRACT:
A mechanical lock is provided which prevents forced rotation of the cylinder when a mated key is not present in the key slot. The lock includes a cylinder rotatably supported within a sleeve. The cylinder defines a longitudinal axis and a keyway disposed along the axis for slidably receiving a key therein. A cylinder head extends circumferentially about a first end of the cylinder and includes a frangible ring portion which fractures in response to a predetermined rotational force. A tab extends from the cylinder head and includes a frangible base which also fragments in response to a predetermined rotational force. The mechanical lock further includes a sidebar for preventing rotation of the cylinder when a mated key is not present therein. The sidebar includes a rib extending therefrom which prevents the longitudinal sliding of the sidebar out of the mechanical lock when the cylinder head has been broken away from the cylinder.
REFERENCES:
patent: 1705344 (1929-03-01), Thompson
patent: 2004433 (1935-06-01), Fitz Gerald
patent: 2004434 (1935-06-01), Gerald
patent: 2024441 (1935-12-01), Fitz Gerald
patent: 2031155 (1936-02-01), Gerald
patent: 3287944 (1966-11-01), Crumb
patent: 3455130 (1969-07-01), Basseches
patent: 3499209 (1970-03-01), Laviana
patent: 4008588 (1977-02-01), Miller et al.
patent: 4074547 (1978-02-01), Seidewand
patent: 4074548 (1978-02-01), Milton
patent: 4195502 (1980-04-01), Best et al.
patent: 4413493 (1983-11-01), Meinsen et al.
patent: 4454736 (1984-06-01), Mochida
patent: 4550581 (1985-11-01), Best et al.
patent: 4559795 (1985-12-01), Zagoroff
patent: 4667994 (1987-05-01), Foshee
patent: 4669287 (1987-06-01), Reader et al.
patent: 4685317 (1987-08-01), DeWalch
patent: 4773240 (1988-09-01), Foshee
patent: 5010755 (1991-04-01), Best
Janssen David C.
Resch Dennis E.
Boucher Darnell M.
Strattec Security Corporation
LandOfFree
Breakaway cylinder head does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Breakaway cylinder head, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Breakaway cylinder head will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1698487