Locks – Operating mechanism – Key
Patent
1985-09-30
1987-06-02
Wolfe, Robert L.
Locks
Operating mechanism
Key
70 15, 70422, 292DIG37, 292DIG38, E05B 1516
Patent
active
046692878
ABSTRACT:
A lock assembly has a lock barrel which slides in a housing so that a finger at the end of the barrel can release a latch. The lock barrel is prevented from sliding when the barrel is locked, by engagement of the finger with a blocking plate, but the barrel is freed when the key is inserted and turned. The finger is made so that it shortens if excessive axial force is applied while the barrel is locked. This shortening may be effected by including an easily rupturable connection between different sections of the finger. When the finger shortens, the connection ruptures and prevents the finger from getting near the latch to release it. Once the connection has ruptured, further movement of the barrel into the housing will bring the barrel into contact with the outer periphery of the blocking plate which is well supported.
REFERENCES:
patent: 1324428 (1919-12-01), Mair
patent: 2000280 (1935-05-01), Fitzgerald
patent: 2004434 (1935-06-01), Fitzgerald
patent: 2609679 (1952-09-01), Bremer et al.
patent: 2787154 (1957-04-01), Wesberry
patent: 3597949 (1971-08-01), Nigrelli
patent: 4074547 (1978-02-01), Seidewand
patent: 4074548 (1978-02-01), Milton
patent: 4446709 (1984-05-01), Steinbach
Charles John M.
Reader Michael W.
Ford Motor Company
Gall Lloyd A.
Sadler Clifford L.
Stock Daniel M.
Wolfe Robert L.
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