US PATENT SUBCLASS 172 / 620
.~.~ Parallel transverse tooth bars

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

613  DF  PLURAL RELATIVELY MOVABLE TOOLS {14}
619  DF  .~ Plural tool groups relatively vertically movable because of operation {9}
620.~.~ Parallel transverse tooth bars {2}
621  DF  .~.~.~> Spring biased bars
622  DF  .~.~.~> With actuator to vary inclination of teeth

DEFINITION

Classification: 172/620

(under subclass 619) Apparatus comprising a plurality of horizontal bars parallel to one another and extending substantially transverse to the direction of travel, the bars each carrying a plurality of earth working teeth, the bars being so connected as to be individually capable of vertical motion with respect to one another during operation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

634+, for a plurality of horizontal parallel tooth bars which are angularly adjustable about their supporting axis, but which bars are so mounted on a frame or interconnected one to the other as to be incapable of independent vertical motion relative to each other.