Rock drill bit with neck protection
US6446739B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 2000 |
| Grant date | Sep 10, 2002 |
| Priority date | — |
| Expiry date | Jul 19, 2020 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/1092
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A rotary drill bit for boring a bore hole in an earthen formation includes a bit body having a pin end, a cutting end and a longitudinal axis and including at least two legs extending from the cutting end. Each of the legs includes a leading side surface, a trailing side surface, and a shoulder, and each of the legs further includes a bearing and a cutter cone rotatably supported on the bearing. The bit body further including a fluid flow system that includes a flowway in the pin end. The flowway is in fluid communication with at least one exit port in the cutting end. The bit body further includes a neck between the shoulders and the pin end and a hard, wear-resistant material on at least a portion of the neck.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.