Abstract An earth moving implement including a blade adjustably supported on a U-shaped frame with the free ends of its legs pivotally connected to a vehicle. The control system includes fluid rams for raising and lowering the frame with respect to the vehicle, angling the blade with respect to the U-shaped frame about a vertical axis, and tilting the blade with respect to the frame about a horizontal axis longitudinally of the vehicle. The hydraulic control incorporates an interconnection between the rod ends of the tilt cylinders with means for supplying a constant charging pressure to the rod ends of the tilt cylinders. The charging means may include a connection from the angle cylinders through a regulator valve to the rod ends of the tilt cylinders; or a connection between one end of the lift cylinders through a regulator valve to the rod end of the tilt cylinder; or a connection between the conventional pump of the transmission hydraulic system of the vehicle, or a separate pump connected to the rod ends of the tilt cylinder, all alternates.
In combination with a vehicle having a longitudinal axis, a dozer blade pivotally mounted on said vehicle, tilt rams of the hydraulic piston cylinder type interconnected between the dozer and the blade, with the pistons being connected by rods to the upper edge of the blade, and means for maintaining a predetermined constant fluid pressure in the blade connected rod ends of the tilt rams; and means comprising lifter rams of the hydraulic piston cylinder type, interconnected between the blade and the dozer, whose pistons are connected by rods to the lower edge of the blade whereby fluid in the upper ends of the lifter rams will be pressurized by ground resistance to the lower edge of the blade during dozing, and conduits connecting the upper ends of the lifter rams to the rod ends of the tilt rams, whereby the fluid of the lifter rams pressurized during dozing operations, will pressurize the fluid in the rod ends of the tilt rams, thereby maintaining constant fluid pressure in the blade connected rod ends of the tilt rams and inhibiting tilting of the blade during normal dozing operation.
Claim 2
Dependent Claim
187 words
In combination with a vehicle having a longitudinal axis, a dozer blade pivotally mounted on said vehicle, tilt rams of the hydraulic piston cylinder type interconnected between the dozer and the blade, with the pistons being connected by rods to the upper edge of the blade, and means for maintaining a predetermined constant fluid pressure in the blade connected rod ends of the tilt rams; and means comprising lifter rams of the hydraulic piston cylinder type, interconnected between the blade and the dozer, whose pistons are connected by rods to the lower edge of the blade whereby fluid in the upper ends of the lifter rams will be pressurized by ground resistance to the lower edge of the blade during dozing, and conduits connecting the upper ends of the lifter rams to the rod ends of the tilt rams, whereby the fluid of the lifter rams pressurized during dozing operations, will pressurize the fluid in the rod ends of the tilt rams, thereby maintaining constant fluid pressure in the blade connected rod ends of the tilt rams and inhibiting tilting of the blade during normal dozing operation.