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US 4,786,231 AGranted
Noise attenuating and air streamlining spiral
OwnerWinfield L. Kelleyinventor
Life of this patent
Estimating the term…
Abstract
A fan assembly which has an air inlet that combines the function of absorbing fan noise and the function of streamlining air intake. A continuous strip of sound absorbing material is mounted on a perforated support and is wrapped in an overlapping manner which, when placed with the fan, dampens fan noises, as well as allows acceleration and uniformity of distribution of incoming airflow.
Claims8
An air inlet assembly for a fan unit containing a fan and means to rotate said fan, comprising:
- support members attachable at uniformly spaced locations to said fan units;
- a first perforated support strip;
- a first strip of sound absorbing material mounted on said perforated support strip, said first perforated support strip and first sound absorbing material being bound in a helical overlapping manner to form a frusto-conical configuration, said support members passing transversely through said frusto-conical configuration adjacent the edge of smaller transverse dimensions;
- a second perforated strip;
- and
- a second strip of sound absorbing material mounted on said second perforated support strip, said second perforated support strip and second sound absorbing material strip being wound in a helical overlapping configuration to form a cone, said cone configuration being positioned within the frustoconical configuration and shielding in front from inlet air said means to rotate said fan, said support members passing transversely through said conical configuration adjacent the edge of the base, and said support members crossing each other.
3 more elements
Dependencies are inferred from the claim text.