Patent ID: 6840334
Filing Date: 2005-01-11
Classification: E02F

Abstract:
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 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.