Shear punching die assemblies
US8215148B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 2007 |
| Grant date | Jul 10, 2012 |
| Priority date | — |
| Expiry date | Aug 26, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/2133
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A shear punching die assembly having first and second die units in which a material is punched to form a work while the material is clamped between the first and second die units is taught that preferably include a main punch contained in the first die unit and having a cross-sectional shape corresponding to a shape of the work, an ejector contained in the second die unit and positioned axially opposite to the main punch, an ejector biasing member normally biasing the ejector toward the main punch, an ejector retaining device that is capable of acting on the ejector when the first and second die units are in a closed condition, thereby retaining the ejector in a predetermined position, and an ejector releasing device that is capable of acting on the ejector retaining device when the first and second die units are opened over a desired distance, thereby releasing the ejector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.