Percussion rock drill bit
US5794728A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1996 |
| Grant date | Aug 18, 1998 |
| Priority date | — |
| Expiry date | Dec 20, 2016 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/56
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A rock drill bit for percussive drilling includes a head and a shank. The shank has a central boring in which a thread is provided. The thread cooperates with a corresponding thread in a drill string driven by a top hammer. The boring is connected to at least one fluid passage which emerges in or in the vicinity of a front face of the head. The fluid passage connects to a first groove which connects to a second groove, wherein at least three second grooves are provided and form between them axially forward lands. Each land carries a gauge insert. The gauge inserts are asymmetrically positioned on the drill bit, and the second groove extends radially inwards to or beyond an imaginary circle touching the radially innermost points of the inserts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.