Door-latch opener

Details Door-latch opener Door-latch opener

1990-05-30

1991-01-22

Nicholson, Eric K.

Closure fasteners

Operators with knobs or handles

292165, 292DIG65, 292DIG66, E05B 300

Patent

active

049865838

ABSTRACT:
A push-type and a pull-type door-latch opener capable of use with a plunger-type fusible pin operated fire-safety lock mechanism including a mounting plate, a horizontal pivoting rod attached to the plate, a vertical pivoting rod attached to the plate at a right angle to and adjacent the horizontal pivoting rod, a horizontal bell crank pivoted about the vertical rod and having a first arm projecting into the plane of the door for operating the door-latch and a second arm engaged by a portion of a door handle pivoted on the horizontal rod, and a torsion spring coaxial with the horizontal rod for biasing the door handle into a preselected position.

REFERENCES:
patent: 3441269 (1969-04-01), Doyle
patent: 3477754 (1969-11-01), Check
patent: 3705739 (1972-12-01), Adler
patent: 3722938 (1973-03-01), Bauer
patent: 3897092 (1975-07-01), Atkins
patent: 3975933 (1976-08-01), Bako
patent: 4003593 (1977-01-01), Wilzig
patent: 4007954 (1977-02-01), Erickson
patent: 4145900 (1979-03-01), Ohno
patent: 4384738 (1983-05-01), Floyd
patent: 4629228 (1986-12-01), Marko et al.

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