Rotary percussive piloted rock drill bit
US10385620B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 2018 |
| Grant date | Aug 20, 2019 |
| Priority date | — |
| Expiry date | Mar 26, 2038 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/40
- 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 and a leading carbide member. The leading carbide member includes a pair of sloped surfaces extending forwardly towards each other and intersecting at a leading cutting edge. The leading cutting edge and sloped surfaces extend along a crescent shaped arc. Forward air delivery bores extend through the body to forward discharge openings at the pilot drill section. Rear air delivery bores extend through the body to rear discharge opening at the waste debris ejection slots.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.