Control device for a hydraulic cylinder for maintaining the pulling force thereof constant
US4553391A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 15, 1983 |
| Grant date | Nov 19, 1985 |
| Priority date | — |
| Expiry date | Nov 15, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/76
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A hydrostatic machine having a fixed displacement volume which is connected to the operating chamber of a hydraulic cylinder which machine is mechanically coupled to a second hydrostatic machine having a variable displacement volume to control the force exerted by the hydraulic cylinder. When control liquid is displaced from the working chamber of the cylinder the first machine acting as a motor drives the second machine which displaces control liquid into an accumulator. Vice versa, liquid is taken from the accumulator and the second machine acting as a motor drives the first machine which feeds liquid into the working chamber. The pressure in the working chamber, or, respectively, the force exerted by the cylinder is maintained constant by a corresponding adjustment of the displacement volume of the second machine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.