Drill bit for rock drilling tool, and rock drilling tool

US9797202B2 · kind B2 · utility

Assignee

• Sandvik Intellectual Property AB · SE

Inventors

• Andreas Rindeskar · Hofors, SE
• John Hammargren · Sandviken, SE

Key dates

• Filing date: Oct 29, 2012
• Grant date: Oct 24, 2017
• Expiry date: Mar 12, 2034

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B10/5673
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

A drill bit for rock drilling tools includes a drill bit head having a front surface including a face surface defining a forward-most end of the drill bit head. The face surface has an outer edge, a gauge surrounding the face surface, the gauge having an inner edge, and a transition region that extends in a direction of a longitudinal axis of the drill bit between the outer edge of the face surface and the inner edge of the gauge. An entirety of the face surface from which the cutting surfaces extend is non-flat so that a center of the face surface is axially forward of the outer edge of the face surface. The gauge includes a first gauge surface defining a first angle with the longitudinal axis over a first portion of a circumference of the gauge and a second gauge surface defining a second angle with the longitudinal axis over a second portion of the circumference of the gauge.