Rotating fan guard
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United States of America Patent
Stats
-
Nov 9, 1993
Grant Date -
N/A
app pub date -
Jun 26, 1992
filing date -
Jun 26, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A rotating fan guard is disclosed that prevents personal injury to people working near a rotating fan while reducing the noise level of the fan as compared to a fan with a stationary fan guard. The rotating fan guard comprises a plurality of concentric rings spaced so as to prevent the ingress of a person's finger between the rings and into contact with the fan blades. The concentric rings are attached to the fan rotor to which the fan blades are also attached. The fan guard thus rotates along with the fan blades. The rotating fan guard produces air flow having less air turbulence and less generated noise, relative to a stationary fan guard. The rotating fan guard generates mostly 'white noise' which is less hazardous to human hearing than 'pure tone' high frequency noise generated by prior art stationary fan guards.
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