US PATENT SUBCLASS 172 / 484
.~.~ By parallel links

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

452  DF  WITH ACTUATOR ADAPTED TO LIFT TOOL FOR TRANSPORT ON WHEELED FRAME OR BROADLY CLAIMED IMPLEMENT {37}
483  DF  .~ Translatable tool {1}
484.~.~ By parallel links

DEFINITION

Classification: 172/484

(under subclass 483) Apparatus in which the earth working element is carried by links pivoted to the frame and the earth working element, said links remaining substantially parallel throughout the vertical movement of the tool.

SEE OR SEARCH THIS CLASS, SUBCLASS:

307, for tools mounted forward of the rear of a motor vehicle and having a parallelogram-type lift means for raising the tool.

439+, for a tool lifted by a mast-type hitch having parallel links.