Title:
BIT HAVING HARD METAL BORING HEAD
Document Type and Number:
Japanese Patent JPS5428703
Kind Code:
A
Abstract:
A rock drill for rotary blow drilling with a drilling head arranged at the free end of the drill shaft, which at least partially consists of hard metal. The drilling head the end face of which is circular disc shaped or circular ring shaped includes a formed piece of solid hard metal. Cutting bodies are machined out of the end of this piece of hard metal which cutting bodies have the shape of pyramids or truncated pyramids and taper with increasing distance from the drill shank.
Inventors:
UORUFUGANGU PEETSU
JIIGUFURIIDO KURAISURE
BERUNHARUTO MOOZERU
JIIGUFURIIDO KURAISURE
BERUNHARUTO MOOZERU
Application Number:
JP9470978A
Publication Date:
March 03, 1979
Filing Date:
August 04, 1978
Export Citation:
Assignee:
HAWERA PROBST KG HARTMETALL
International Classes:
B23B51/00; B23B51/04; E21B10/00; E21B10/44; E21B10/48; (IPC1-7): E21C13/00