Hydraulic overload proportional valving system for a mechanical press
US5638748A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 25, 1996 |
| Grant date | Jun 17, 1997 |
| Priority date | — |
| Expiry date | Jan 25, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB30B15/284
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The invention pertains to a press comprising, a drive mechanism, a slide and at least two connecting rods connecting between the drive mechanism and the slide for reciprocally driving the slide. At least two fluid valves are connected to respective connecting rods and manifolded together with a hydraulic chamber disposed in or adjacent the connecting rods. An electrically adjustable proportional valve is connected to the fluid valves which operate to vary the pressure at which the fluid valves open to unload the slide. A variable system pressurizing mechanism for pressuring said chambers to a predetermined system pressure is utilized while the mechanism may unload the slide if pressure within a hydraulic chamber exceeds a predetermined system pressure. A variable relief mechanism automatically relieves pressure within the hydraulic chambers dependent on an operating state of the press.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.