Title: Latch plate

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.

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Inventors: Tatum, James R. (Islington, CA, US)
Dayus, Barry R. (Oakville, CA, US)

Application Number: 899284
Filing Date: 1978-04-24
Publication_date: 1979-11-27
Assignee:
Primary Class(es): 160/1 160/84.02
Other Classes:
US Patent Ref:

3475865	Nov, 1969	Arnes	16/197.
3907020	Sep, 1975	Root	160/1.
3992751	Nov, 1976	Foster et al.	16/197.

Other Refs:
Primary Examiner: Caun, Peter M.
Assistant Examiner:
Attorney: