Hydraulic control arrangement
US4613257A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1983 |
| Grant date | Sep 23, 1986 |
| Priority date | — |
| Expiry date | Dec 21, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D23/18
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hydraulic control arrangement comprises a first hydraulic ram, a second hydraulic ram, and a hydraulic control circuit associated with the first and second hydraulic rams. Each of the hydraulic rams has a cylinder, a piston reciprocable within the cylinder, and a piston rod fixed to the piston. Each of the hydraulic rams has a cylindrical working chamber and an annular working chamber positioned on opposite sides of its piston. The piston rod of each hydraulic ram constitutes the cylinder of a respective metering ram, a respective metering piston being reciprocable within the cylinder of each metering ram to define a metering chamber therewithin. The hydraulic control circuit includes a line, which interconnects the two metering chambers, and a hydraulic valve positioned in a hydraulic fluid supply line leading to the cylindrical working chamber of the second hydraulic ram. The metering piston of the second hydraulic ram controls the hydraulic valve, thereby controlling the flow of hydraulic fluid to the cylindrical working chamber of the second hydraulic ram.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.