Rotating blade damper with blade lock and stop mechanism

Details Rotating blade damper with blade lock and stop mechanism Rotating blade damper with blade lock and stop mechanism

1990-07-20

1991-06-04

Joyce, Harold

49 7, F24F 1100

Patent

active

050204238

ABSTRACT:
A rotating blade damper for an air handling system, the damper having a perimetrical frame and a blade or a plurality of blades each of which is rotatable with respect to the frame between a flow permitting position and a flow blocking position. Each blade is biased toward its flow blocking position but is normally retained in its flow permitting position, for example, by a fusible link. A stop and lock mechanism is provided to stop each blade in a predetermined open or flow permitting position and to securely lock or latch each blade in its closed or flow blocking position. The stop and lock mechanism includes a disc segment which is carried by a blade rod, at a location outside of the damper frame, and a slide plate which is positioned between the damper frame and the disc segment. The slide plate is slidable with respect to the damper frame and the blade rod between a first position, corresponding to the open position of the blade, in which its movement is blocked by engagement with an arcuate portion of the disc segment, and a second position, corresponding to the closed position of the blade, in which it engages a stop surface at the trailing edge of the disc segment to mechanically block its return to a position corresponding to the open position of the blade.

REFERENCES:
patent: 2287262 (1942-06-01), Merry
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patent: 3650069 (1972-03-01), Alley
patent: 4080978 (1978-03-01), McCabe
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patent: 4338967 (1982-07-01), McCabe
patent: 4442862 (1984-04-01), McCabe
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patent: 4555981 (1985-12-01), McCabe
patent: 4581987 (1986-04-01), Ulicny
patent: 4610197 (1986-09-01), Van Becelaere

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