Hydraulic leveling control system for a loader type vehicle
US6308612A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1998 |
| Grant date | Oct 30, 2001 |
| Priority date | — |
| Expiry date | Sep 24, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/50545
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A control system for a lift boom pivotable with respect to a vehicle by a boom cylinder and material handling unit pivotable with respect to the boom by a unit cylinder when the control of a boom control valve and a unit control valve. The control system includes a flow divider/combiner valve and operative in a boom-raise, unit-leveling mode to pass a preset portion of the fluid displaced from the rod end of the boom cylinder to the base end of the unit cylinder. The flow divider-combiner valve is operative in a boom-lower, unit-leveling mode, to combine the fluid stream displaced from the base end unit cylinder in a preset ratio with pressurized fluid, and pass the combined stream to the rod end of the boom cylinder. The control system can be disengaged from the automatic leveling mode to enable the boom unit to be operated manually under the control of the boom and unit control valves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.