Patent ID: 6782680
Filing Date: 2004-08-31
Classification: A01B

Abstract:
In an agricultural machine, including a frame having a central section extending transverse to a normal direction of travel and having opposite ends respectively joined to upright legs, a wheel-support link coupled to each leg for pivoting vertically, a wheel rotatably mounted to each wheel-support link, and an extensible and retractable actuating device being coupled between said frame and each wheel-support link for selectively adjusting the associated wheel-support link, the improvement, comprising: each actuating device being coupled to said frame by a further link vertically pivotally coupled to said frame and pivotally coupled to the actuating device at a location spaced from the connection between the further link and the frame; and a spring being coupled between each further link and said frame and resisting upward pivoting movement of said further link.