Blade lift float circuit for motor graders
US4034815A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 20, 1975 |
| Grant date | Jul 12, 1977 |
| Priority date | — |
| Expiry date | Mar 20, 1995 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/844
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A construction vehicle, such as a motor grader, comprises a work tool mounted thereon and adapted to be selectively moved by at least one double-acting hydraulic cylinder. A fluid circuit comprises a pressurized fluid source adapted to communicate fluid to the cylinder via a first control valve. A normally closed second control valve is operatively connected between a storage tank of the fluid source and the rod and head ends of the cylinder for exhausting fluid therefrom to the tank directly upon actuation of an independent actuation means. Opening of the second control valve will thus place the cylinder in a "float" condition of operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.