Door latch

Details Door latch Door latch

1989-03-30

1990-01-02

Smith, Gary L.

Closure fasteners

Bolts

Sliding and swinging

292346, 292DIG25, 292DIG72, 2923363, E05C 500

Patent

active

048908681

ABSTRACT:
A safety door latch is provided for a door hinged to a door frame in a building having a first and second floor. The door latch is spring biased closed to keep the door in a secured locked position and can be manually released to unlock the door from the first and second floors.

REFERENCES:
patent: 223624 (1880-01-01), DeWitt
patent: 401574 (1889-04-01), Murphy
patent: 446997 (1891-02-01), Stroh et al.
patent: 703372 (1902-07-01), Beisel
patent: 1062110 (1913-05-01), Moore
patent: 1356479 (1920-10-01), Werner
patent: 1700557 (1929-01-01), Cherniack et al.
patent: 1811575 (1931-06-01), Broadwater
patent: 4666195 (1987-05-01), Thomas, III

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