Hydraulic circuit device of hydraulic working machine
US7487609B2 · kind B2 · utility
5Cited by
10References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 1, 2002 |
| Grant date | Feb 10, 2009 |
| Priority date | — |
| Expiry date | Nov 4, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/7142
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
To permit smooth performance of both of an operation requiring a high pressure and an operation desired to produce a pressure at a suppressed level, a shuttle block positioned between pilot operating units and flow control valves and pump regulators is arranged in association with shuttle valves, which select maximum pressures of groups of operation signal pressures produced by the pilot operating units, respectively, and at least one of the plural groups of operation signals, and is constructed to include hydraulic selector valves and a boom-lowering, hydraulic selector valve that are operable in particular ways.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.