US PATENT SUBCLASS 172 / 532
.~ Screw or spiral

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

518  DF  ROLLING, ROTATING OR ORBITALLY MOVING TOOL {30}
532.~ Screw or spiral

DEFINITION

Classification: 172/532

(under subclass 518) Apparatus in which the circumferential edge of the rolling or rotating earth working element is a spiral or a substantial portion of a spiral.

SEE OR SEARCH THIS CLASS, SUBCLASS:

119, for screw- or spiral-type tools which are driven about an axis transverse to the line of draft.

549, for plural tooth or blade units on a single axle which could be adjusted to have the circumferential edge of the teeth or blades in the form of a spiral.