US PATENT SUBCLASS 172 / 572
.~.~ Spring acts to move tool vertically

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

518  DF  ROLLING, ROTATING OR ORBITALLY MOVING TOOL {30}
570  DF  .~ With spring means other than for detent {2}
572.~.~ Spring acts to move tool vertically {1}
573  DF  .~.~.~> Plural tools, individually spring urged

DEFINITION

Classification: 172/572

(under subclass 570) Apparatus in which a spring acts to move said earth working elements vertically.

SEE OR SEARCH THIS CLASS, SUBCLASS:

551, for a rolling tool having teeth, tines, or blades and provided with spring means to urge the tool into ground contact.

705+, for spring means to move an earth working element other than disk vertically.