Smoke and fire shield damper

Details Smoke and fire shield damper Smoke and fire shield damper

1978-06-16

1980-01-22

Downey, Kenneth

Movable or removable closures

Thermal releaser or actuator

Fusible closure latch or retainer

49 84, 98110, 98121A, 137601, E05F 1520

Patent

active

041842880

ABSTRACT:
A combination smoke and fire shield damper comprising a line of blades each of which is so supported for rotation in a surrounding frame that the blades are swingable about parallel axes to open or close an opening in the frame, in which the blades are provided with "opened-out" trailing edges so that the leading edge of each blade interlocks with the trailing edge of an adjacent blade when the blades are in their fully-closed positions.

REFERENCES:
patent: 3372514 (1968-03-01), Adams
patent: 3771559 (1973-11-01), Allen
patent: 3996952 (1976-12-01), Root
patent: 4080978 (1978-03-01), McCabe

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