(under the class definition) Apparatus comprising a framework, a ground wheel or wheel substitute carried thereby, an earth working element associated with the framework, a means for applying a draft force to the framework and means connecting the ground wheel or wheel substitute to the draft-force applying means whereby the ground wheel or wheel substitute may be moved vertically with respect to the framework by the draft-force applying means due to a force resulting from resistance of the apparatus to being moved over the earth by the draft force applying means.
(1) Note. Apparatus in which the vertical movement of the ground wheel is only the result of the draft force causing a ground wheel to rotate so that power from the rotating ground wheel causes the vertical movement is not included under this definition. See subclasses 407+, especially subclasses 408+ for apparatus in which a wheel is vertically adjusted by power from a wheel.
(2) Note. Apparatus comprising a ground wheel or wheel substitute which moves relatively to the framework due to irregularities in the surface of the ground and is connected to a draft means so as to move it correspondingly is not included. See subclass 239 for such apparatus.
(3) Note. Apparatus in which the draft- force applying means
causes the ground wheel or wheel substitute to move only when a turn is being made is not included. See subclass 255 for such apparatus.
SEE OR SEARCH THIS CLASS, SUBCLASS:
236, for apparatus including a ground-engageable draft responsive lever. 239, for apparatus comprising a ground level responsive depth control of the type comprising a wheel and a linkage associated with an articulated hitch to a propelling vehicle.
255, for apparatus in which a turning movement causes an earth working element to be lifted off or lowered into the ground.
407+, especially subclasses 408+ for apparatus in which a wheel is vertically adjusted relative to its running gear by power derived from the rolling motion of a wheel.
467, for an apparatus comprising an actuator adapted to lift a tool for transport on a wheeled frame or broadly claimed implement and also comprising a shiftable hitch for causing vertical movement of the tool.
588, for apparatus comprising a hitch shiftable on a tongue for angling gangs of disks.
605, for an apparatus comprising a shiftable hitch for moving a tool relative to the frame.