Fluid handling – Destructible or deformable element controlled – Heat destructible or fusible
Patent
1978-09-29
1980-12-30
Schwadron, Martin P.
Fluid handling
Destructible or deformable element controlled
Heat destructible or fusible
98 86, 160 1, 251212, 251294, F16K 1738, F16K 3104, E05F 1520
Patent
active
042417481
ABSTRACT:
A pair of butterfly smoke/fire dampers are mounted on a single frame. Each damper includes a pair of blades which can be locked in the open position and which, when released, rotate about a hinge to the closed position. The frame has a flange around the inner periphery thereof which engages the edges of the blades in the closed position. Each pair of blades are moved to the open position by an operator cable which extends through a first ferrule in the frame, through a second ferrule in one of the blades and thereafter across the blades to a point of attachment complementally located on the opposing blade. The frame ferrule is offset from the blade ferrule whereby withdrawing the cable causes both blades to be drawn toward each other. The blades can be held in the open position by maintaining tension on the operator cable or by a fusible link or other heat responsive latching mechanisms.
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patent: 2148530 (1939-02-01), Burke
patent: 3009473 (1961-11-01), Hennen
patent: 3273632 (1966-09-01), McCabe
patent: 3327764 (1967-06-01), McCabe
patent: 3401734 (1968-09-01), McCabe
patent: 3725972 (1973-04-01), McCabe
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patent: 3899156 (1975-08-01), McCabe
patent: 4146048 (1979-03-01), McCabe
Gerard Richard
Prefco Products, Inc.
Schwadron Martin P.
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