Locks – Special application – For closures
Patent
1998-12-21
1999-09-14
Gall, Lloyd A.
Locks
Special application
For closures
70370, 70451, 70468, 70483, 292150, 292359, E05B 5500
Patent
active
059504676
ABSTRACT:
A door lock includes an external locking unit and an internal locking unit mounted on the door body of a door at outer and inner sides to hold a lock cylinder, and a locking bolt unit controlled by the external locking unit to lock/unlock the door, the internal locking unit having a circular base block fixedly fastened to the door body, a rotary cover rotatably mounted on the circular base block, a shaft forced by a spring member into engagement with the spindle of the lock cylinder, and a sliding knob mounted on the rotary cover and shifted between a first position wherein the rotary cover and the spindle of the lock cylinder are stopped from rotary motion, and a second position where the rotary cover and the spindle of the lock cylinder are allowed to be rotated between the locking position and the unlocking position.
REFERENCES:
patent: Re15569 (1923-04-01), Ottinger
patent: 649706 (1900-05-01), Phelps
patent: 1572077 (1926-02-01), Perez
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patent: 1956388 (1934-04-01), Kalina
patent: 2435634 (1948-02-01), Nicolin et al.
patent: 2525340 (1950-10-01), Clark
patent: 2580196 (1951-12-01), Schlage
patent: 2839913 (1958-06-01), Friedman et al.
patent: 3591218 (1971-07-01), Gowland
patent: 3919867 (1975-11-01), Lipschutz et al.
patent: 4216985 (1980-08-01), Sorensen
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