Title:
【発明の名称】さく岩機
Document Type and Number:
Japanese Patent JPS596994
Kind Code:
B2
Abstract:
A conventional type of impact rock drill is modified to include a fluid reservoir, valve and piston arrangement whereby each impact stroke of the driver ejects water at high pressure from the cutter bit, thereby increasing the mechanical cutting through hydraulic action of a small volume of high pressure jet of water.
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Inventors:
OOBURII SHII BURITSUGU
Application Number:
JP14674780A
Publication Date:
February 15, 1984
Filing Date:
October 20, 1980
Export Citation:
Assignee:
DRAVO CORP
International Classes:
B25D9/12; E21B1/00; E21B1/26; E21B7/18; E21C37/24; (IPC1-7): E21C3/04
Attorney, Agent or Firm:
Akimoto Teruo
Next Patent: JPS596995