US PATENT SUBCLASS 172 / 84
.~ Simultaneously reciprocating and oscillating blade having elongated shank

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

35  DF  WITH DRIVE MEANS FOR TOOL OR CLEANER {37}
84.~ Simultaneously reciprocating and oscillating blade having elongated shank {3}
85  DF  .~.~> Transverse chopping type {2}
88  DF  .~.~> With plural cranks or cams driving each blade
89  DF  .~.~> Means for varying contour of path of blade

DEFINITION

Classification: 172/84

(under subclass 35) Apparatus in which the earth working element comprises at least one tooth which has an earth-engaging portion and an elongated shank portion said earth-engaging portion having an oscillating motion about a point and the point itself having a component of motion generally parallel to or coinciding with the longitudinal axis of the shank in addition to the motion imparted to it by the traverse of the apparatus over the ground whereby the motion of the earth-engaging portion may be analyzed as a reciprocation in directions generally longitudinally of the shank and also an oscillation in directions generally transversely of the shank.

(1) Note. The earth-engaging portion is usually either perpendicular to the shank to provide a hoeing action or else aligned with the shank to provide a spading motion.

(2) Note. An earth working element comprising a carrier means such as a chain or wheel, for example, which carrier forms the support for earth-engaging teeth and has an orbital movement while the teeth supported by it also move with respect to it is not included. See subclasses 91+ for such devices.

(3) Note. An earth working element comprising a driven wheel or like carrier means having movably mounted on the periphery thereof a blade or like earth working portion, there being provided a means to swing such blade or portion back and forth through an arc the center of which arc moves through a circular path concentric with the circular path of the driven carrier is not included. See subclass 94 for such elements.

SEE OR SEARCH CLASS

171, Unearthing Plants or Buried Objects, 99, for a digger supported and guided for motion in a rectilinear or curvilinear path.

180, Motor Vehicles,

8.1+, for a motor vehicle having reciprocating or oscillating leg propulsion means.