Selectively actuatable fluid control system for a work element
US4341149A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 30, 1979 |
| Grant date | Jul 27, 1982 |
| Priority date | — |
| Expiry date | Aug 30, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/8606
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A fluid control system for selectively holding a work implement, such as a blade in a motor grader or the like, in a fixed position in a first operation mode, and for selectively providing a shock absorbing system (70,72) for the implement in a second operating mode. In the fixed position mode, lock valves (36,38,68) are operative to provide positive locking for an implement actuator (24,26), while in the shock absorbing mode, longstem lock valves (82,84) are operable to maintain one check valve (102) of a dual valve structure (96,98) unseated at all times. Each unseated check valve (102) provides a connection of one end of an implement actuator (24,26) to vent to insure that the shock absorbing system (70,72) maintains a full shock absorbing capacity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.