Warning device activated by a key left in a lock

Details Warning device activated by a key left in a lock Warning device activated by a key left in a lock

1988-08-02

1989-09-05

Scott, J. R.

Communications: electrical

Condition responsive indicating system

Specific condition

200 4305, 200 6162, 200 6166, 340686, G08B 1314, H01H 2706

Patent

active

048642797

ABSTRACT:
A warning device is operable to indicate that a key has been inadvertently or otherwise unknowingly left in a lock. A movable member normally prevents insertion of a key into the lock keyhole and is manually movable to a temporary remote position permitting insertion and use of the key. Subsequent release of the movable member causes it to return to its initial position and, if the key remains in the lock, into contact with the key thereby completing an electrical circuit connection between the movable member and a signalling device which is accordingly operated to warn the user that the key has been left in the lock.

REFERENCES:
patent: 901983 (1908-10-01), Metzger
patent: 1562039 (1925-11-01), Nowakowski
patent: 4658106 (1987-04-01), Makoe

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