US PATENT SUBCLASS 172 / 424
.~.~ Spring assisted

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

395  DF  WITH GROUND SUPPORT VERTICALLY ADJUSTABLE RELATIVE TO FRAME {10}
423  DF  .~ With actuator {3}
424.~.~ Spring assisted

DEFINITION

Classification: 172/424

(under subclass 423) Apparatus in which a spring device is provided to assist the actuating means in moving the ground support vertically.

SEE OR SEARCH THIS CLASS, SUBCLASS:

506, for spring-assisted actuators for lifting tools for transport on a wheeled frame.