Patent ID: 6336784
Filing Date: 2002-01-08
Classification: B66F

Abstract:
A boom-type vehicle, comprising:a frame carrying a set of ground-engaging wheels; a stabilizing cylinder interposed between the frame and the wheels for cushioning shocks caused by movement of the wheels relative to the frame; a frame leveling arrangement interposed between the frame and the wheels for leveling the frame relative to the ground; a boom pivotably mounted to the frame; and a position sensing arrangement interposed between the boom and the frame for sensing the angle of the boom relative to the frame; wherein the frame leveling arrangement includes a leveling speed control responsive to the position sensing arrangement for enabling the frame leveling arrangement to operate at a first speed of operation when the angle of the boom relative to the frame is below a predetermined threshold, and to operate at a second speed of operation less than the first speed when the angle of the boom relative to the frame is above the predetermined threshold.