Rotating fan guard

Details Rotating fan guard Rotating fan guard

1992-06-26

1993-11-09

Look, Edward K.

Rotary kinetic fluid motors or pumps

With sound or vibratory wave absorbing or preventing means...

4151212, 415220, 416247R, F04D 2966

Patent

active

052597261

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.

REFERENCES:
patent: 2601947 (1952-07-01), Buttner
patent: 2720935 (1955-10-01), Lysholm et al.
patent: 3261544 (1966-07-01), Guichard
patent: 4350472 (1982-09-01), Morimoto
patent: 4768472 (1988-09-01), Hayashi et al.
patent: 5131810 (1992-07-01), Wang

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