Heavy duty punch
US5044244A · kind A · utility
Inventor
Key dates
| Filing date | Jun 29, 1990 |
| Grant date | Sep 3, 1991 |
| Priority date | — |
| Expiry date | Jun 29, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/9428
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A heavy duty punch for piercing armor plate and the like has a shank by which the punch may be held when in use and a piercing end projecting axially from the shank. The piercing end terminates in a sharp-edged tip. The tip is connected to the shank by a reduced-diameter portion defined by a curved sidewall extending axially from the tip toward the shank and a straight-sided sidewall extending axially from the curved sidewall toward the shank. The straight-sided sidewall is spaced from the tip a distance slightly greater than the thickness of the workpiece being punched; the diameter of the straight-sided sidewall is slightly less than the diameter of the tip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.