Closure fasteners – Bolts – Emergency operating means
Patent
1976-02-23
1977-01-18
Foss, J. Franklin
Closure fasteners
Bolts
Emergency operating means
70 92, 292165, 292DIG66, E05F 1520
Patent
active
040035930
ABSTRACT:
A push door-latch opener suitable for hospital rooms including a door mounting plate, a horizontal pivoting rod attached to the plate, a vertical pivoting rod attached to said plate and located above the horizontal rod, a horizontal bell crank pivoted about said vertical rod and having a first arm projecting into the plane of the door and a second arm being substantially parallel to the plane of the door, a torsion spring for biasing said bell crank in a direction so that the second arm is biased in the direction of the first arm, and a downwardly-directed push handle pivoted about said horizontal rod and being biased to a first out position and being adapted to be pushed to a second in position, the push handle having above the horizontal rod an upwardly-directed projection which engages the inner surface of the second arm of the bell crank so that when the push handle is pushed, the projection turns the second arm away from the door and simultaneously turns the first arm, thereby operating a latching mechanism.
A preferred embodiment of the push door-latch opener is provided with a fire-safety lock mechanism. The push handle of this embodiment includes a downwardly-directed, laterally-extending projection below the horizontal rod, and the door-latch opener further includes a blocking rod contained within a housing attached to the mounting plate below the horizontal rod, a coil spring for biasing the rod upwardly, and a fusable pin extending through the housing and into the blocking rod which will fuse at the high temperature of a fire and thereby release the blocking rod upwardly to block the inward movement of the push handle.
REFERENCES:
patent: 2201444 (1940-05-01), Marsh
patent: 3477754 (1969-11-01), Check
patent: 3811717 (1974-05-01), Floyd et al.
Schuessler Charles J.
Wilzig Herbert
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