Flexible or portable closure – partition – or panel – Automatic control
Patent
1978-04-24
1979-11-27
Caun, Peter M.
Flexible or portable closure, partition, or panel
Automatic control
160 84R, E05F 1520, E06B 394
Patent
active
041756070
ABSTRACT:
A latch plate for an automatic fire damper intended to be used in ductwork to close such ductwork in the event of fire is formed as a unitary structure. Such a latch plate comprises mutually perpendicular end and side flanges and is integrally formed on its side flange with a transversely projecting, arcuate-sectioned tongue about which there can be wound a spool type tension spring which is operative to move a closure or shutter of such a damper into its closed position on fusion of a mechanical catch mechanism normally holding such a closure in its open position. The side flange of the latch plate is formed with a lateral cam surface along which a terminal blade member of the closure rides as it moves into its closed position and such surface is formed with a pair of ribs on the shutter when that shutter reaches its fully closed position so then releasably to hold the shutter in such closed position, and a novel blade for use in such a fire damper having one symmetrical and one assymetrical hinge part.
REFERENCES:
patent: 3475865 (1969-11-01), Arnes
patent: 3907020 (1975-09-01), Root
patent: 3992751 (1976-11-01), Foster et al.
Dayus Barry R.
Tatum James R.
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