Patent · US Active

Multi-sectional percussive drill bit assembly

US7389833B2 · kind B2 · utility

10Cited by

15References

33Claims

0Family size

Assignee

Keystone Drill Services, Inc. · US

Inventors

Thomas Walker · Tübingen, DE
Richard K. Smith · Sanford, US
Stephen R. Means · Punxsutawney, US

Key dates

Filing date	Jun 7, 2006
Grant date	Jun 24, 2008
Priority date	—
Expiry date	Aug 9, 2026

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B17/046
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A multi-sectional percussive drill bit assembly for drilling holes in earth formation primarily used in conjunction with a pneumatic percussive device. The drill bit assembly is comprised of an easily removable bit that is rotationally driven by a lug and pocket structure and axially limited in travel by means of retaining members.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.