The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 10, 1993
Filed:
Feb. 19, 1992
Koji Hirose, Osaka, JP;
Toyo Umpanki Co., Ltd., Osaka, JP;
Abstract
A loading vehicle has a boom pivotally mounted thereon for movement in a vertical plane, the boom supporting a loading unit at its distal end. A fluid control system includes a boom cylinder for raising and lowering the boom, a loading unit cylinder for tilting the loading unit relative to the boom, a tank for holding fluid and a pump for selectively pumping fluid to the cylinders through manually controlled selector valves. The loading unit attitude is controlled by a system including a bypass valve, a flow splitting valve and a boom position detector for actuating the bypass valve. Fluid forced from a lowering chamber of the boom cylinder as the boom is raised is applied to the bypass valve. As long as the boom is in a position falling within a lower range of positions the boom position detector does not actuate the bypass valve and all fluid from the lowering chamber is diverted to the tank. When the boom moves out of the lower range of positions the detector actuates the bypass valve and it diverts all fluid from the lowering chamber to the flow splitting valve which splits the flow. A first split flow is returned to the tank and a second split flow is applied to a lowering chamber of the loading unit cylinder to tilt the loading unit relative to the boom as the boom is raised.