Patent · US Expired

Rock drilling tool and reamer for percussive drilling

US6202768A · kind A · utility

6Cited by

4References

13Claims

0Family size

Assignee

SANDVIK AB · SE

Inventors

Daniel Lindgren · Reedsville, US
Per-Olof Liljebrand · Sandviken, SE
Hakan Lindstrom · Gothenburg, SE

Key dates

Filing date	Mar 23, 1999
Grant date	Mar 20, 2001
Priority date	—
Expiry date	Mar 23, 2019

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B10/40
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A rock drilling tool includes a pilot bit screw threaded into a front end of a drill rod. A reamer is mounted on the outside of the pilot bit. The reamer includes a central opening having a front portion and a rear portion. The front portion is connected to the pilot bit, and the rear portion constitutes a stiffening sleeve which extends around the outside of the drill rod.

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