Locks – Operating mechanism – Key
Patent
1989-11-02
1992-04-07
Gall, Lloyd A.
Locks
Operating mechanism
Key
70421, E05B 2904
Patent
active
051016494
ABSTRACT:
A key-operable lock having a releasable plug which is rotatable from a locked condition to an unlocked condition. The plug is removable from a fixed mounting member only in the unlocked condition and is blocked for removal in the locked condition by the combined effects of a master key-operable tumbler which is slideable in the plug and a boss which is fixed to the plug. In the locked condition, the boss and one end portion of the control tumbler extend outwardly from the plug to engage a fixed mounting member and the diametrically opposite end portion of the tumbler is inside of the plug. When a master key is inserted into the lock and the plug is rotated to the unlocked position both end portions of the control tumbler are inside of the plug; the boss is aligned with a slot of the mounting member and the plug is free to be removed from the fixed mounting member.
REFERENCES:
patent: 1805891 (1931-05-01), Shinn
patent: 1905639 (1933-04-01), Jacobi
patent: 1908672 (1933-05-01), Jacobi
patent: 2061456 (1936-11-01), Falk
patent: 2065683 (1936-12-01), Gahagan
patent: 2097190 (1937-10-01), Jacobi
patent: 2677266 (1954-05-01), Hagstrom
patent: 4009599 (1977-03-01), Patriquin
patent: 4272975 (1981-06-01), Patriquin
patent: 4398405 (1983-08-01), Patriquin
patent: 4416129 (1983-11-01), Thimot
Gall Lloyd A.
Rad Lock Inc.
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