US PATENT SUBCLASS 172 / 86
.~.~.~ With plural cranks or cams driving each blade

Current as of: June, 1999
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172 /   HD   EARTH WORKING

35  DF  WITH DRIVE MEANS FOR TOOL OR CLEANER {37}
84  DF  .~ Simultaneously reciprocating and oscillating blade having elongated shank {3}
85  DF  .~.~ Transverse chopping type {2}
86.~.~.~ With plural cranks or cams driving each blade

DEFINITION

Classification: 172/86

(under subclass 85) Apparatus in which the elongated shank portion is driven by plural cranks or eccentric pins or cams which engage the earth working element at points which are spaced along said shank portion.

SEE OR SEARCH THIS CLASS, SUBCLASS:

88, for other earth working elements having elongated shank portions driven by plural spaced cranks or eccentric pins or cams.