Drill steel and its manufacture
US11278971B2 · kind B2 · utility
0Cited by
19References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 31, 2020 |
| Grant date | Mar 22, 2022 |
| Priority date | — |
| Expiry date | May 23, 2040 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/03
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A drill steel includes a metal rod with an end to fit within a chuck of a drilling machine, and an integrally formed collar provided along the length of the metal rod. A ferrule is fastened on the metal rod adjacent the integrally formed collar on the side of the end of the metal rod. The ferrule forms a stop that prevents the drill steel from moving too far into the chuck.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.