Title:
【発明の名称】流体駆動型ダウンザホール穿孔装置
Document Type and Number:
Japanese Patent JP3352234
Kind Code:
B2
Abstract:
Fluid driven down-the-hole drilling machine. The hammer piston (2) of the down-the-hole drilling machine is adjacent to its front end provided with a cylindrical part (6). The drill bit (3) is provided with a first impact surface (41) which receives impacts during drilling, a second impact surface (42) and an annular section (7) which surrounds the cylindrical part (6) between the impact surfaces. The second impact surface (42) receives the impact energy of the hammer piston at reversed feeding of the housing (1) of the down-the-hole drilling machine for freeing the drill bit when it has become stuck.
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| WO/2021/094214 | STRIKING MECHANISM ASSEMBLY |
Inventors:
Bernd Equol
Martin Peterson
Martin Peterson
Application Number:
JP16014194A
Publication Date:
December 03, 2002
Filing Date:
July 12, 1994
Export Citation:
Assignee:
Atlas, Copco, Lockteck, Activolag
International Classes:
B25D17/06; E21B1/00; E21B1/26; E21B4/14; (IPC1-7): E21B1/26; E21B4/14
Other References:
【文献】米国特許3944003(US,A)
【文献】西独国特許出願公開3802391(DE,A1)
【文献】仏国特許出願公開2411676(FR,A1)
【文献】西独国特許出願公開3802391(DE,A1)
【文献】仏国特許出願公開2411676(FR,A1)
Attorney, Agent or Firm:
Shigeru Yagita (1 outside)