Locks – Operating mechanism – Key
Patent
1990-07-24
1991-03-26
Gall, Lloyd A.
Locks
Operating mechanism
Key
70419, E05B 2904
Patent
active
050019147
ABSTRACT:
A pick-resistant lock having a housing and a keyway cylinder rotatably mounted within the housing includes a plurality of tumblers and a lock bar associated with the cylinder to render picking of the lock difficult by conventional techniques. The housing has a cylinder-accepting bore provided with a pair of locking grooves arranged so as to face one another. The tumblers and lock bar are movable into and out of locking relationship with a corresponding one of the locking grooves and along parallel paths when the cylinder is positioned in a lock mode position. Springs mounted within the cylinder urge the lock bar and tumblers against one another and toward positions out of the locking grooves while maintaining the lock bar in a locked relationship within its corresponding locking groove so that the cylinder is prevented from rotating. Insertion of the proper key within the cylinder shifts the tumblers and lock bar to positions at which the cylinder may be rotated, but improper manipulations of the cylinder and tumblers may either bind the lock bar in a locked relationship within its corresponding locking groove or shift a tumbler into a locked relationship within its corresponding locking groove.
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patent: 3479848 (1969-11-01), Golden
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patent: 4750342 (1988-06-01), Nakai
Gall Lloyd A.
Hurd Lock and Manufacturing Co., Inc.
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