US PATENT SUBCLASS 416 / 137
.~.~.~ Convolute spring coaxial with impeller shaft

Current as of: June, 1999
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416 /   HD   FLUID REACTION SURFACES (I.E., IMPELLERS)

131  DF  ARTICULATED, RESILIENTLY MOUNTED OR SELF-SHIFTING IMPELLER OR WORKING MEMBER {7}
135  DF  .~ Resilient bias or mount {2}
136  DF  .~.~ Rotary working member pivotable solely about radial axis {1}
137.~.~.~ Convolute spring coaxial with impeller shaft

DEFINITION

Classification: 416/137

(under subclass 136) Apparatus wherein the resilient element comprises a spiral spring coaxial with the impeller shaft.