Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Sectional – staged or nonrigid working member
Patent
1987-03-25
1988-05-24
Garrett, Robert E.
Fluid reaction surfaces (i.e., impellers)
Articulated, resiliently mounted or self-shifting impeller...
Sectional, staged or nonrigid working member
416241A, 416243, 416210R, 416236R, 416223R, 416248, B63H 106, B63H 126
Patent
active
047462710
ABSTRACT:
The invention pertains to a fan blade and a method for making a fan blade wherein the stresses within the blade material are substantially constant throughout the length of the blade and the unique construction of the blade reduces the concentration of loading on the blade material. Preferably, the blade is molded of a synthetic plastic material and includes a ribbed structure locating material offset from the concave convex configuration of the blade air flow portion such that the section modulus of blade sections from the air flow portion toward the root portion increases by increasing the distance of the blade material from the neutral bending axis in such a manner that no abrupt changes occur and the stresses imposed upon the blade material throughout its length are substantially constant. The basic concept of the invention is achieved by the most advantageous location of the blade material relative to its neutral bending axis, and the practice of the invention permits the blade to most efficiently utilize the material while withstanding the forces and stresses imposed thereon resulting in significant economies of manufacture.
REFERENCES:
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patent: 3751181 (1973-08-01), Hayashi
patent: 3846045 (1974-11-01), Mincuzzi
patent: 4003677 (1977-01-01), Parkes
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patent: 4671739 (1987-06-01), Read et al.
Garrett Robert E.
Hayes-Albion Corporation
Newholm Therese
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