Title:
【発明の名称】穿岩ドリル
Document Type and Number:
Japanese Patent JPS62501092
Kind Code:
A
Abstract:
An hydraulic rock drill which can be used either as a rotary percussive rock drill or as a rotary rock drill. It has a pressure fluid chamber (90) that transmits the feeding force that is applied to the rock drill housing during drilling to the drill stem adaptor (58) when the drill is operating in the percussive mode. When the drill is operating in the rotary mode, the pressure fluid chamber is depressurized and the feeding force is instead transmitted through taper roller bearings (44).
Inventors:
Masarupi, Giovani
Spawnry, Peter Paul
Streidam, William Denveill
Spawnry, Peter Paul
Streidam, William Denveill
Application Number:
JP50480185A
Publication Date:
April 30, 1987
Filing Date:
October 22, 1985
Export Citation:
Assignee:
Atlas Copco Activrag
International Classes:
E21B1/26; E21B1/00; E21B6/00; E21B6/02; (IPC1-7): E21B6/00; E21C3/20
Attorney, Agent or Firm:
Shigeru Yagita