Method and apparatus for making wire nails having radially offset, fully circular heads
US5195931A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1992 |
| Grant date | Mar 23, 1993 |
| Priority date | — |
| Expiry date | Feb 7, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21G3/12
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Nails having radially offset, circular heads are manufactured from a malleable wire. The wire is clamped so that a leading portion extends axially from a clamping mechanism. The extending portion is bent at an acute angle relative to a clamping axis. The extending portion is cut so as to form a pointed end thereon and so as to leave a bent stub extending at such an angle. Such a nail head is formed from the stub, which is pressed by a punch into a cavity defined by the clamping mechanism, and which is deformed when pressed thereinto. The cavity has a fully circular, offset margin. The punch has a face covering the cavity. Once released, the wire is fed axially until a leading portion extends as before. These operations are repeated to form a similar nail in each repetition. A novel apparatus for carrying out these operations is disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.