Rotary percussive piloted rock drill bit
US10047564B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 2016 |
| Grant date | Aug 14, 2018 |
| Priority date | — |
| Expiry date | Sep 24, 2036 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/43
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A piloted rock drill bit includes an integral body having a pilot drill section, a reaming section and a mounting base section extending along a longitudinal axis. The reaming section includes four wings extending from the longitudinal axis in an “X” pattern. A cutting carbide member is secured to each wing. Waste debris ejection slots extend radially into the reaming section between the wings. The pilot drill section includes a post. A leading carbide member is secured to the post. The leading carbide member includes a pair of sloped surfaces extending forwardly towards each other and intersecting at a leading cutting edge which extends perpendicular to the longitudinal axis. The leading cutting edge and sloped surfaces extend along a crescent shaped arc. An air delivery bore extends through the body to discharge openings located between the leading cutting edge and wings which extend radially perpendicular to the leading cutting edge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.