Methods of and/or apparatus for punching holes in sheet metal
US4317351A · kind A · utility
28Cited by
2References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 11, 1980 |
| Grant date | Mar 2, 1982 |
| Priority date | — |
| Expiry date | Mar 11, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/4836
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A machine for punching holes in sheet metal has a punch roller carrying a plurality of punches and a back up roller having a groove therein which has a bottom at a predetermined depth in the back up roller. Its method of use is to run sheet metal through the nip between the two rollers so that the punches punch out slugs of metal so that a point on each slug bears against the bottom of the groove which acts as a pivot point on which the slug pivots to cause the slug to be completely freed from the parent metal by the further action of the punch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.