Locks – Operating mechanism – Using a powered device
Patent
1993-10-12
1995-05-02
Gall, Lloyd A.
Locks
Operating mechanism
Using a powered device
70271, 70427, 70DIG49, E05B 1714, E05B 4700
Patent
active
054108985
ABSTRACT:
A lock device includes a lock body with a lock shell, a key plug received in the lock shell, and an anti-dusting cover assembly secured on a front end of the lock shell. The key plug has a front end which is formed with a recess that has an end wall which is formed with a keyhole. The cover assembly includes a cover plate with a key slot that is aligned with the keyhole, and an anti-dusting plate mounted pivotally to a rear wall surface of the cover plate. A magnet is mounted on a rear wall surface of the anti-dusting plate. A magnetic conductor is provided on the front end of the key plug in a pivoting direction of the anti-dusting plate. A magnetic reed switch is provided on the lock shell and is normally disposed adjacent to the magnetic conductor. The magnetic reed switch is activated by the magnet via the magnetic conductor when the anti-dusting plate pivots rearwardly to locate the magnet adjacent to the magnetic conductor due to insertion of an article into the keyhole of the key plug. A control circuit is capable of activating an electrical anti-theft system when rotation of the key plug relative to the lock shell in order to unlock the lock device does not occur within a predetermined time period when the control circuit is activated by the magnetic reed switch.
REFERENCES:
patent: 3434318 (1969-03-01), Thiry
patent: 4594866 (1986-06-01), Neyvet
patent: 4858454 (1989-08-01), McAnulty, III
patent: 5307658 (1994-05-01), Kokubu et al.
patent: 5309743 (1994-05-01), Kokubu et al.
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