US PATENT SUBCLASS 172 / 489
.~.~ Tools relatively moved during lift

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


172 /   HD   EARTH WORKING

452  DF  WITH ACTUATOR ADAPTED TO LIFT TOOL FOR TRANSPORT ON WHEELED FRAME OR BROADLY CLAIMED IMPLEMENT {37}
488  DF  .~ Single lift actuator for plural relatively movable tools {1}
489.~.~ Tools relatively moved during lift

DEFINITION

Classification: 172/489

(under subclass 488) Apparatus wherein the earth working elements are moved relative to each other as a result of the lifting movement.

SEE OR SEARCH THIS CLASS, SUBCLASS:

138+, for diverse tools which are vertically adjustable by a single actuator and move relative to one another when adjusted.

390, for apparatus having a plurality of spring tools carried by parallel pivoted tooth bars and also having a wheel substitute such as a runner, said bars usually having an actuator to pivot said bars whereby the tools will be raised.