Title:
【発明の名称】削岩装置
Document Type and Number:
Japanese Patent JP3335211
Kind Code:
B2
Abstract:
Rock drilling device comprising a backhammer unit (10) in which a hammer piston (9) is movable to-and-fro for automatically exposing a tube string (4) to impacts in a direction away from a drill bit (8) in the tube string. The backhammer unit comprises a housing (13) and a springloaded tube part (14). The housing and the tube part form between them a first valve (16) and a second valve (17). At drilling the first valve which contols the supply of driving medium to said hammer piston is closed and the second valve which controls the flushing medium flow is open. At backwards feeding of the rock drilling machine (2) along the feed beam (1) with a force which exceeds a predetermined value the first valve is open and the second valve is closed.
Inventors:
Jjorgen Rodart
Kurt Anderson
Kurt Anderson
Application Number:
JP7939493A
Publication Date:
October 15, 2002
Filing Date:
April 06, 1993
Export Citation:
Assignee:
Atlas, Copco, Lockteck, Activolag
International Classes:
B25D9/04; E21B1/00; E21B1/02; E21B6/02; E21B31/113; B25D9/00; (IPC1-7): E21B6/00; E21B1/00
Other References:
【文献】米国特許4807709(US,A)
【文献】西独国特許出願公開3802391(DE,A1)
【文献】欧州特許出願公開81469(EP,A2)
【文献】欧州特許出願公開510416(EP,A2)
【文献】英国特許出願公開2020598(GB,A)
【文献】西独国特許出願公開3802391(DE,A1)
【文献】欧州特許出願公開81469(EP,A2)
【文献】欧州特許出願公開510416(EP,A2)
【文献】英国特許出願公開2020598(GB,A)
Attorney, Agent or Firm:
Shigeru Yagita (2 outside)