Locks – Special application – For closures
Patent
1997-08-26
1999-02-09
Gall, Lloyd A.
Locks
Special application
For closures
70149, 70223, 70224, 70422, E05B 1310
Patent
active
058680187
ABSTRACT:
A door lock comprises: a spindle with projections; a bushing having grooves which mate with the projections of the spindle, and a key groove on one side thereof; an inside inner spindle with two fitting grooves, which is inserted into the spindle and rotates by an operation shaft of a key box; a locking spring which is inserted into the inside inner spindle; an inside outer spindle which is inserted, spaced a short distance from the inside inner spindle, having two guide apertures, a latch operation projection with an operation groove, and two fitting projections on its front end, which are fitted in the fitting grooves; a support washer which is inserted into the inside of the inside outer spindle; a spindle spring which is supported by the support washer; an operation disk with two guide projections which are inserted into the guide apertures of the inside outer spindle; and an operation key which is inserted into the key groove of the bushing so that its front end is inserted into the operation groove of the inside outer spindle. Accordingly the present invention can prevent damage to the door lock and its break downs that may occur when opening the secured door lock by force from the outside.
REFERENCES:
patent: 1804781 (1931-05-01), Keeler
patent: 3368375 (1968-02-01), Russell et al.
patent: 3621685 (1971-11-01), Sargent
patent: 3922896 (1975-12-01), Kagoura
patent: 3955387 (1976-05-01), Best et al.
patent: 4838053 (1989-06-01), Shen
patent: 5010752 (1991-04-01), Lin
patent: 5018375 (1991-05-01), Tully
patent: 5040391 (1991-08-01), Lin
patent: 5372025 (1994-12-01), Lin
Gall Lloyd A.
Hyundae Metal Co., Ltd.
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