Title:
ドリル構成要素間のジョイントを解放する方法、および削岩機
Document Type and Number:
Japanese Patent JP4708673
Kind Code:
B2
Abstract:
A rock drill includes a string of components interconnected by screw threads and connected to a shank. A percussion piston is reciprocated against the shank during a drilling operation, while a support device applies axial support to the rear of the shank, to enhance the drilling action. When the components are being unscrewed, the percussion piston is actuated to strike the rear end of the drill string, after the support device has at least partially released the axial support of the shank, to enable tensile stress to be generated in the components by the percussive impacts to facilitate unscrewing of the components.
Inventors:
Muttonen, Timo
Salminen, pecca
Salminen, pecca
Application Number:
JP2002506341A
Publication Date:
June 22, 2011
Filing Date:
June 18, 2001
Export Citation:
Assignee:
Sandvik Intellectual Property Actie Borag
International Classes:
E21B1/26; B28D1/14; B28D1/26; E21B1/00; E21B7/02; E21B15/04; E21B19/16
Foreign References:
| US5351763 | ||||
| US4194579 |
Attorney, Agent or Firm:
Atsushi Aoki
Jun Tsuruta
Tetsuro Shimada
Shinji Mitsuhashi
Masaya Nishiyama
Jun Tsuruta
Tetsuro Shimada
Shinji Mitsuhashi
Masaya Nishiyama