Grader attachment for a skid steer
First Claim
1. A grader attachment for a loader type utility vehicle which utilizes the auxiliary hydraulics of that vehicle comprising:
- an elongated frame member having a proximal end for attachment to the vehicle and a distal end with at least one steerable wheel;
a blade positioned between the proximal end and the distal end of the elongated frame member;
a blade control means;
a steering means;
a propulsion control means; and
a safety valve/back pressure valve comprising a check valve, a first electric cartridge valve, an at least second electric cartridge valve, and a pressure reducing valve, the safety valve/back pressure valve receiving fluid from the auxiliary hydraulics of the vehicle;
wherein the fluid is directed through the first electric cartridge valve to a tank port when the attachment is not in use;
wherein the fluid is blocked by the first electric cartridge valve when the attachment is in use; and
the fluid is directed to the check valve, fluid passing through the check valve is directed through a main equipment valve to the blade control means, the main equipment valve comprising a main relief valve and a power beyond plug to direct fluid to the steering means; and
fluid blocked by the check valve is directed through the pressure reducing valve and through the second electric cartridge valve through a hydraulic remote control valve to the propulsion control means;
whereby the safety valve/back pressure valve provides fluid under pressure to control the steering of the vehicle and the attachment, to control the propulsion of the vehicle and the attachment and to control the movement of the blade by utilizing the auxiliary hydraulics of the vehicle.
0 Assignments
0 Petitions
Accused Products
Abstract
A grader attachment for a skid steer utilizes the skid steer'"'"'s auxiliary hydraulics to power an independent hydrostatic steering system for the grader and to control skid steer propulsion and grader blade position. The attachment mounts to the skid steer via a standard mounting connection. The auxiliary hydraulics of the skid steer are routed through a flow control valve and then through a safety valve/back pressure valve before being tapped to control the steering, blade positioning and propulsion systems of the grader. The steering and propulsion systems use a cross bar which connects to the hand control levers of the skid steer. The foot pedal used to control propulsion of the skid steer and attachment has a centering system so that the cylinder goes back to neutral when an operator'"'"'s foot is removed from the pedal stopping the unit. The blade positioning system utilizes pairs of lift and angle cylinders which allow the blade to be rotated or tilted.
-
Citations
11 Claims
-
1. A grader attachment for a loader type utility vehicle which utilizes the auxiliary hydraulics of that vehicle comprising:
-
an elongated frame member having a proximal end for attachment to the vehicle and a distal end with at least one steerable wheel;
a blade positioned between the proximal end and the distal end of the elongated frame member;
a blade control means;
a steering means;
a propulsion control means; and
a safety valve/back pressure valve comprising a check valve, a first electric cartridge valve, an at least second electric cartridge valve, and a pressure reducing valve, the safety valve/back pressure valve receiving fluid from the auxiliary hydraulics of the vehicle;
wherein the fluid is directed through the first electric cartridge valve to a tank port when the attachment is not in use;
wherein the fluid is blocked by the first electric cartridge valve when the attachment is in use; and
the fluid is directed to the check valve, fluid passing through the check valve is directed through a main equipment valve to the blade control means, the main equipment valve comprising a main relief valve and a power beyond plug to direct fluid to the steering means; and
fluid blocked by the check valve is directed through the pressure reducing valve and through the second electric cartridge valve through a hydraulic remote control valve to the propulsion control means;
whereby the safety valve/back pressure valve provides fluid under pressure to control the steering of the vehicle and the attachment, to control the propulsion of the vehicle and the attachment and to control the movement of the blade by utilizing the auxiliary hydraulics of the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
Specification