Hard material head and rotary percussion drill bit
US7559382B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 25, 2007 |
| Grant date | Jul 14, 2009 |
| Priority date | — |
| Expiry date | Aug 10, 2027 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23B2251/50
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hard material head (1) for a rotary percussion drill bit (2) having an elongated shaft (15) including at least three cutting edges (4) distributed circumferentially within a circumscribing circle, a bottom surface (6) located opposite the cutting edges (4) and fastened by a material bond to an end (8) of the drill bit shaft (15) of the rotary percussion drill bit (2), concave side surfaces (5) formed circumferentially between adjacent cutting edges (4), and a peripheral pocket (9) opening toward the bottom surface (6) and formed, respectively, in at least two concave side surfaces (5) located opposite one another, and in which a corresponding axial pin (10, 10′) formed on a shaft end (8) is form-locking engageable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.