Latch mechanism

Details Latch mechanism Latch mechanism

1989-11-29

1991-02-05

Wolfe, Robert L.

Locks

Operating mechanism

Key

2923365, E05B 1704

Patent

active

049894307

ABSTRACT:
A latch mechanism for a door or the like includes first and second rotatable latch operating members which operate a latching bolt or the like. An axially movable square section spindle extends through complementary holes in both members. In an engaged position, the spindle operates both members when rotated. In a disengaged position, a circular section portion of the spindle registers with a hole in one of the members. In the disengaged position the bolt can be operated by the first member even though the second member may be prevented from rotating by means of pins. The spindle can be moved between engaged and disengaged positions by a push-rod extending out of the door. Thus, when the second member is locked it may be overriden by actuation of the rod and the first member.

REFERENCES:
patent: 1672711 (1928-06-01), Cummings
patent: 1685317 (1928-09-01), Devereaux
patent: 2702204 (1958-02-01), Collier
patent: 3554147 (1970-12-01), James
patent: 3883164 (1975-05-01), Galbreath et al.
patent: 4073527 (1978-02-01), Schlage
British Standard PS 5872 (1980).

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