Locks – Operating mechanism – Key
Patent
1981-12-17
1983-05-31
Wolfe, Robert L.
Locks
Operating mechanism
Key
70375, 70377, 70DIG42, E05B 1514, E05B 2902
Patent
active
043855105
ABSTRACT:
A cylinder lock includes two barrels (23, 37), a first (23) carrying tumblers (30) that abut internal shoulders (36) of the lock casing (2) to obstruct clockwise `unlocking` rotation only, and the second (37) carrying a single tumbler (43) which obstructs only counter-clockwise `locking` rotation by abutment with a shoulder (48) of a rear-end casing-cover (8). A key (5) inserted through a keyhole-defining assembly (11, 16, 21) withdraws the first-barrel tumblers (30) during initial clockwise turning from the insertion position, and the second-barrel tumbler (43) during initial counter-clockwise turning. Lost-motion coupling between the barrels (23, 37), provided by lug-in-slot (38, 39) interengagement, enables clockwise turning of the second barrel (37) with the key (5) relative to the first barrel (23) during withdrawal of the first-barrel tumblers (30), and corresponding counter-clockwise turning of the first barrel (23) relative to the second (37) during withdrawal of the second-barrel tumbler (43). Lug-in-slot coupling ( 22, 24) between the keyhole-defining assembly (11, 16, 21) and the first barrel (23) similarly allows initial slip for clockwise key-turning. A coiled spring (42) opposes resiliently second-barrel turning in both directions.
REFERENCES:
patent: 1755847 (1930-04-01), Stevens
patent: 1990794 (1935-02-01), McCormac
patent: 3691799 (1972-09-01), Hoffmann
patent: 3863476 (1975-02-01), Patriquim
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