Latch assembly for damper

Details Latch assembly for damper Latch assembly for damper

2006-03-28

2006-03-28

Joyce, Harold (Department: 3749)

Ventilation

Fire damper

C137S074000

Reexamination Certificate

active

07018289

ABSTRACT:
A damper assembly is provided having at least one damper blade that operates in a normally open position. A fusible link is connected to the damper blade to maintain the damper blade in the open position against a biasing force tending to close the damper blade. The fusible link fails upon an occurrence of a predetermined condition. A damper mechanism is provided including a locking mechanism linked to the damper blade that resists opening of the damper blade when the blade has closed due to failure of the fusible link.

REFERENCES:
patent: 3571973 (1971-03-01), Roberts
patent: 3650069 (1972-03-01), Alley
patent: 4080978 (1978-03-01), McCabe
patent: 4193541 (1980-03-01), Scheidweiler
patent: 4610197 (1986-09-01), Van Becelaere
patent: 5020423 (1991-06-01), Hill
patent: 2 262 541 (1974-06-01), None

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