Locks – Operating mechanism – Key
Patent
1991-11-21
1992-11-17
Gall, Lloyd A.
Locks
Operating mechanism
Key
E05B 2708
Patent
active
051633108
ABSTRACT:
A cylindrical lock core is provided having a first plug member with a cross-shaped keyway, four blind holes formed in a lower portion thereof, and a flange at top portion having a projection extending downwardly therefrom. A second plug member is located underneath the first plug member. The second plug member also has a cross-shaped keyway, includes four through holes and a projection extending from one side thereof. The second plug member also has a plurality of setting walls disposed between each aperture of the keyway and each through hole. Each of the through holes is terminated by a small aperture disposed at the bottom end thereof. A plurality of springs are positioned in the blind holes and on each rests a first tumbler pin, each of which has a portion disposed in the first plug member and a remaining portion disposed within the second plug member, which also contains a second tumbler pin in axial alignment. A barrel is provided for receipt of the plug members. When a legal key is inserted through the keyway and rotated to lift up the tumbler pins, the first tumbler pins will be positioned entirely within the first plug member and the second tumbler pins will be positioned entirely within the second plug member, thereby permitting the lock core to rotate, as it is in an unlocked condition.
REFERENCES:
patent: 3411331 (1968-11-01), Schlage
patent: 3863475 (1975-02-01), Foss
Cheeng Iu Industrial Co., Ltd.
Gall Lloyd A.
Klein David I.
Rosenberg Morton J.
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