Keyway plug

Details Keyway plug Keyway plug

1997-12-12

1999-09-14

Boucher, Darnell M.

Locks

Operating mechanism

Key

70395, 70398, E05B 1714

Patent

active

059504668

ABSTRACT:
A keyway plug that provides a means for preventing the correct key from opening a tumbler lock, including a plug and an extractor. The plug fits into the keyway to block complete insertion of a key. In one embodiment, an arm extends from the tip of the plug across the tumblers, but is short enough so that the outermost tumbler drops to hide the plug. In the second plug embodiment, the outermost tumbler drops into a notch to prevent the plug from going too far into the keyway. The extractor includes a narrow finger, the upper edge of which includes a hook that mates with a matching hook in the lower edge of the plug arm. As the extractor is removed, the hooks interlock, causing the plug to be removed.

REFERENCES:
patent: 1696326 (1928-12-01), Roethlisberger
patent: 1728310 (1929-09-01), Sundel
patent: 2068936 (1937-01-01), Unterberg
patent: 2591652 (1952-04-01), Ziegliss
patent: 2662390 (1953-12-01), Michnoff et al.
patent: 3276233 (1966-10-01), Russell et al.
patent: 3408842 (1968-11-01), Barnes et al.
patent: 4120184 (1978-10-01), Gerlach

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