Patent ID: 7987656
Filing Date: 2011-08-02
Classification: A01D

Abstract:
1. A windrowing machine, comprising: a frame supported for movement over the ground; a header extending transversely relative to the frame; header support apparatus connecting the header to the frame, including first and second lift arms extending between the frame and transversely spaced locations on the header, respectively, and first and second height control cylinders, extending between the frame and the lift arms, respectively, each of the height control cylinders being connected to the frame by a connection that allows an end portion of the header supported thereby to be lifted from a first selected height without changing a length of a rod extending from a body of either height control cylinder; an operator control system in operative connection with the height control cylinders and controllable for operating the height control cylinders for positioning the header at selectable heights in relation to the frame; and at least one lift cylinder connected between the frame and at least one of said first and second lift arms, the at least one lift cylinder being an actuator operably controlled and changeable in length by the control system for lifting the header from the first height at which the header is positioned by the height control cylinders to a second height by applying and maintaining at least an upward force on the header without changing the length of the height control cylinders, wherein the header height is returned to the same selected first height upon removal of the force.