Patent · US Expired

Rock drill bit having retrac teeth and method for its manufacturing

US6494275B2 · kind B2 · utility

18Cited by

10References

7Claims

0Family size

Assignee

SANDVIK AB · SE

Inventors

Bengt Asberg · Gävle, SE
Kenneth Larsson · Sandviken, SE
Bertil Ederyd · Gävle, SE

Key dates

Filing date	Mar 2, 2001
Grant date	Dec 17, 2002
Priority date	—
Expiry date	Mar 2, 2021

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B17/0426
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A rock drill bit for percussive drilling, especially top hammer drilling, includes a bit head provided with front rock crushing buttons and a skirt. The bit head is provided with a number of grooves formed in the outside of the skirt and extending in the axial direction of the drill bit. Protruding lands are defined between the grooves, which likewise extend in the axial direction. Axially rearward ends of at least some of the lands are formed with retrac teeth. Each retrac tooth has a cutting edge extending along an outer circumference of the skirt.

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