Cold headed center vacuum drill bit
US5297643A · kind A · utility
24Cited by
14References
17Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Nov 12, 1991 |
| Grant date | Mar 29, 1994 |
| Priority date | — |
| Expiry date | Nov 12, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/58
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drill bit for drilling holes in a work surface including a hard wear-resistant insert and a metal body including a top working surface of an irregular surface configuration having a slot for retaining the hard wear-resistant insert. The body having a metal grain structure substantially parallel with the contour of the body. In a preferred embodiment the body is formed by cold-heading.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.