Method of and apparatus for control of a force applied to or the position assumed by a work effecting element
US4757746A · kind A · utility
3Cited by
5References
6Claims
0Family size
Assignees
Inventor
Key dates
| Filing date | Aug 26, 1987 |
| Grant date | Jul 19, 1988 |
| Priority date | — |
| Expiry date | Aug 26, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB30B15/16
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A control for a press for controlling the flow of fluid to two hydraulic actuators which applies a desired working force to or which positions the press platen in a desired position including a sub-control for introducing first and second super-imposed oscillations on the fluid of the actuators of equal amplitude and opposite phase to reduce internal friction in the actuators without disturbing the desired applied force or position of the platen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.