Air control mechanism having noise suppression means
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United States of America Patent
Stats
-
Feb 10, 1981
Grant Date -
N/A
app pub date -
Apr 6, 1979
filing date -
Apr 6, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention provides an airflow control mechanism for use in an air duct for controlling airflow through the duct. The air flow control mechanism includes a frame positionable in the duct, and a plurality of blades supported by the frame and extending transversely to the direction of the air flow through the air duct. At least one of the blades is supported for pivotal movement about its longitudinal axis and has an elongated edge moveable toward and away from an elongated edge of another of the blades to restrict air flow through the duct. A fiber material strip is applied to at least one of those edges, the fiber material strip including a substrate bonded to that edge and a plurality of closely spaced fibers projecting transversely from the substrate, the fiber covering being functional to prevent the generation of a high frequency standing wave between the adjacent surfaces of the blade.
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