US PATENT SUBCLASS 172 / 551
.~.~ Rolling tool spring biased into ground contact

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

518  DF  ROLLING, ROTATING OR ORBITALLY MOVING TOOL {30}
540  DF  .~ Tool has circumferentially spaced teeth, tines, blades or the like {13}
551.~.~ Rolling tool spring biased into ground contact

DEFINITION

Classification: 172/551

(under subclass 540) Apparatus in which the rolling implement is journaled in a frame which frame is movably mounted on a main frame, there being interposed between the two frames a resilient means for yieldably urging the implement into ground contact.

SEE OR SEARCH THIS CLASS, SUBCLASS:

117, for rotary-driven implements which are yieldably mounted on a supporting frame.

572, for spring means to move a rolling or rotating tool vertically.