Device for confirming whether a lock is locked or unlocked

Details Device for confirming whether a lock is locked or unlocked Device for confirming whether a lock is locked or unlocked

1988-03-15

1990-03-13

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

70432, E05B 4506

Patent

active

049086057

ABSTRACT:
A key has reed switches which are disposed within a head of the key, and switch actuators comprising bias magnets disposed adjacent the reed switches, respectively, and a pair of first driving magnets and second driving magnets which are disposed at the front end face of a cylinder lock and alternately magnetized in opposite directions. In response to the close proximity of the bias magnet and its corresponding driving magnet, the corresponding reed switch is actuated according to the mutual coaction between each bias magnet and its corresponding magnet. The rotation of the key for locking the cylinder lock and the rotation of the key for unlocking the cylinder lock are made to correspond with open and closed states of the reed switches, or the most recent of a locking signal and an unlocking signal.

REFERENCES:
patent: 3579183 (1971-05-01), Lipschutz
patent: 4249161 (1981-02-01), Mohnhaupt
patent: 4432218 (1984-02-01), Hoener
patent: 4438430 (1984-03-01), Young et al.
patent: 4440011 (1984-04-01), Klein
patent: 4631943 (1986-12-01), Hoener

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