Abnormal use indicator for door lock

Details Abnormal use indicator for door lock Abnormal use indicator for door lock

1998-10-09

2000-04-11

Boucher, Darnell M.

Locks

Operating mechanism

Key

70432, 70441, 70DIG59, 70493, E05B 3510, E05B 1700

Patent

active

060475773

ABSTRACT:
A door lock particularly suited for an apartment or condominium where the resident has an entry key and management personnel also have a key that will allow access to the apartment, the door lock having a spring loaded axial pin which is retained in an externally visible position when the lock is actuated by the resident's key and which is released to an externally non-visible position when the lock is actuated by the management key.

REFERENCES:
patent: 671636 (1901-04-01), Scharnweber
patent: 718359 (1903-01-01), Koerber
patent: 856843 (1907-06-01), Carlisle
patent: 1161158 (1915-11-01), Rennert
patent: 3059462 (1962-10-01), Check
patent: 3128618 (1964-04-01), DeVines
patent: 3348220 (1967-10-01), Luna et al.
patent: 3503642 (1970-03-01), Poe
patent: 3824819 (1974-07-01), Neary
patent: 4328692 (1982-05-01), Dice et al.
patent: 4591852 (1986-05-01), Brod
patent: 4656851 (1987-04-01), Leek et al.

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