(under the class definition) Apparatus comprising means for lifting an earth working element out of the ground or lowering the element into ground engagement responsive to a change in the direction of movement of the apparatus over the ground or responsive to a steering means for changing the direction of movement of the apparatus.
SEE OR SEARCH THIS CLASS, SUBCLASS:
278+, for apparatus with actuating means for horizontally angling the axis of rotation of a ground wheel, which angling may be accompanied by a vertical movement of the wheel with respect to its carrying frame but there being no turning of the implement as a result of the wheel angling, particularly subclasses 279+ for an implement part interconnected with a motor vehicle steering means, subclass 283 for a wheel on a trailing implement responding to turning movement and interconnected with an adjustable earth working element, and subclass 287 for a wheel on a nonself-propelled device having means to angle it horizontally and interconnected with an earth working element. In subclasses 279+, 283, and 287 the earth working element does not move off or into the ground responsive to turning movement.
383+, for apparatus with a ground wheel whose axis of rotation may be adjusted to different angular positions and in which horizontal angling may be accompanied by vertical wheel movement but there being no turning of the implement as a result of the wheel angling.