Title:
NOTCH FORMATION DEVICE OF BLASTING HOLE AND NOTCH FORMATION
Document Type and Number:
Japanese Patent JPH07259470
Kind Code:
A
Abstract:
PURPOSE: To provide a notch formation device capable of carrying out hole drilling and notch machining in one process, capable of carrying out notch formation in specified dimension even in the case when a hole shape changes and high in safety.
CONSTITUTION: A blasting hole is drilled by a drill 80 for hole drilling, and a bit 40 for notch formation is projected out of a notch formation device 10 by a projection means. Thereafter, a notch is formed on a blasting hole wall while drawing out the drill 80 for hole drilling and a main body 30 of the notch formation device 10 from the blasting hole.
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Inventors:
MURAYAMA TSUNEMI
HAYASHI HIRONOBU
SASAKI MITSUO
FURUNAGA TATSUHIRO
YOSHIKAWA KENJI
ENDO YOSHIHIKO
HAYASHI HIRONOBU
SASAKI MITSUO
FURUNAGA TATSUHIRO
YOSHIKAWA KENJI
ENDO YOSHIHIKO
Application Number:
JP7776494A
Publication Date:
October 09, 1995
Filing Date:
March 25, 1994
Export Citation:
Assignee:
NIPPON STEEL CORP
OKUMURA CORP
OKUMURA CORP
International Classes:
E21C37/04; (IPC1-7): E21C37/04
Attorney, Agent or Firm:
Spring Inoue (1 person outside)