Key sensor alarm for door locks

Details Key sensor alarm for door locks Key sensor alarm for door locks

1995-10-19

1997-10-21

Hofsass, Jeffery

Communications: electrical

Systems

Signal light systems

340457, 340542, 340568, B60Q 100

Patent

active

056800940

ABSTRACT:
A key reminder device for use in combination with a key lock mechanism having an adjustable timer with a predetermined timer interval electrically coupled to a replaced power supply. The timer is energized upon detection of a conventional key inserted into the key lock mechanism. Should the key remain in the key lock mechanism beyond a predetermined time, the timer will activate an audible alarm to remind the owner of the keys to remove them. Should the timer be set at a low level, the device operates to indicate the presence of a key. When used in combination with a visual indicator, the key reminder provides an indicator of door entry to the hearing impaired.

REFERENCES:
patent: 2847656 (1958-08-01), Ricks
patent: 3579183 (1971-05-01), Lipschutz
patent: 4652865 (1987-03-01), Maharshak
patent: 4758819 (1988-07-01), Kuribayashi
patent: 4864279 (1989-09-01), Cooper
patent: 4868559 (1989-09-01), Pinnow
patent: 4985693 (1991-01-01), Sunami
patent: 5051724 (1991-09-01), Morrow et al.
patent: 5113174 (1992-05-01), Wake
patent: 5461360 (1995-10-01), Guim et al.

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