Rotary kinetic fluid motors or pumps – With sound or vibratory wave absorbing or preventing means...
Patent
1990-05-24
1992-06-02
Look, Edward K.
Rotary kinetic fluid motors or pumps
With sound or vibratory wave absorbing or preventing means...
415191, 416247R, F01D 2500
Patent
active
051182521
ABSTRACT:
The noise of operation of a fan assembly having a fan blade which rotates in a predetermined direction upon operation of the fan assembly may be reduced by the use of an intake grill including an inner central portion, ring elements disposed in mutually spaced, concentric relation to one another about the central portion, and spirallly-extending support elements connected to the central portion and to the ring elements. The intake grill further includes mutually circumferentially-spaced finger elements connected to and projecting away from a grill mounting surface which are also connected to the outermost ring element and thereby support the interconnected ring elements, central portion, and support elements in spaced relation to the grill mounting surface. Stiffening elements may be disposed between adjacent support elements and connected to selected adajcent ones of the ring elements.
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Lasko copy of advertisement.
Copy of Lakewood fan catalogue, p. 9, High Velocity Reversible Window Fan, copy in p. 23 (Coding Except Ceiling Fans).
Dybvig Roger S.
Look Edward K.
The W. B. Marvin Manufacturing Company
Verdier Christopher M.
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