Door lock with indicator

Details Door lock with indicator Door lock with indicator

1982-09-27

1985-01-01

Wolfe, Robert L.

Locks

Parts, attachments, accessories and adjuncts

Condition indicators

70330, E05B 4100

Patent

active

044909993

ABSTRACT:
A self-contained door lock with an indicating device visible on the inside surface of a door that can be provided as an adaptor for existing door locks or manufactured as part of the original door lock. The indicating device automatically gives a visible indication at the lock location as to whether the door lock is locked or unlocked. The indicating device automatically works in coordination with the door lock mechanism.

REFERENCES:
patent: 747252 (1903-12-01), Smith
patent: 943637 (1909-12-01), Schoell
patent: 999044 (1911-07-01), Kuster
patent: 1216899 (1917-02-01), Weyer
patent: 1337401 (1920-04-01), Heberling
patent: 1362647 (1920-12-01), Stone
patent: 2565669 (1951-08-01), Smith

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