US PATENT SUBCLASS 172 / 522
.~ Axis substantially vertical

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

518  DF  ROLLING, ROTATING OR ORBITALLY MOVING TOOL {30}
522.~ Axis substantially vertical {1}
523  DF  .~.~> With vertically extending teeth {3}

DEFINITION

Classification: 172/522

(under subclass 518) Apparatus in which the axis of rotation of the earth working element is substantially vertical.

(1) Note. The axis may deviate from the vertical by as much as 45 degrees. Also the axis may be adjustable to a horizontal position.

SEE OR SEARCH THIS CLASS, SUBCLASS:

110, for a driven tool that rotates about a substantially vertical axis.

169, for diverse tools, one of which is a tool which rotates about a substantially vertical axis.