.~ Tool differentially or sequentially lifted at longitudinally spaced points
DEFINITION
Classification: 172/473
(under subclass 452) Apparatus in which the earth working element is positively adjusted vertically at different rates or at different times at points spaced in the direction of travel by a single actuator (to thereby raise the earth working element vertically as well as tilt the same about a transverse axis).
(1) Note. For the meaning of "actuator" see the class definition.
(2) Note. This definition includes a device having an actuator which is connected to a tool beam at a single point where the beam is also connected to the frame at a longitudinally spaced point by means of a cam, link, etc., such that upon operation of the actuator the beam is positively caused to move such that the two points of connection of necessity are moved vertically at different rates. This is to be distinguished from connections such as a freely pivoted link etc., which will permit but not necessarily enforce a different rate of movement, and which is excluded from this definition. See subclass 480.
SEE OR SEARCH THIS CLASS, SUBCLASS:
474, for means to adjust an implement about a horizontal transverse axis including means to adjust said axis vertically.
480, see (1) Note above. 484, for means to adjust an implement vertically including parallel links connecting the implement and frame.
