Title:
ネジ式ジョイント、雄ネジ部材および雌ネジ部材
Document Type and Number:
Japanese Patent JP3806033
Kind Code:
B2
Abstract:
Two components used in a percussive drill string include a spigot and a sleeve, respectively. The spigot includes a male thread connected to a female thread of the sleeve to form a thread joint. The male and female threads are dimensioned such that axially inner and outer end areas of the female thread are in non-engagement with the male thread when the thread joint is in a tightened state. The spigot includes axially inner and outer conical guiding surfaces facing toward respective axially outer and inner conical guiding surfaces, respectively. Each conical guiding surface forms an angle with a centerline of the sleeve, the angle lying in the range 1 to 20 degrees, to prevent the spigot and the sleeve from being welded together by frictional heat during a drilling operation.
Inventors:
L'Arsson, Kenneth
Application Number:
JP2001540012A
Publication Date:
August 09, 2006
Filing Date:
November 14, 2000
Export Citation:
Assignee:
Sandvik Intellectual Property Actie Borag
International Classes:
E21B17/042
Foreign References:
| DE512954C2 | ||||
| US4022287 | ||||
| US3822952 | ||||
| US4441565 |
Attorney, Agent or Firm:
Atsushi Aoki
Takashi Ishida
Tetsuji Koga
Nagasaka Tomoyasu
Hiroshi Kamematsu
Masaya Nishiyama
Takashi Ishida
Tetsuji Koga
Nagasaka Tomoyasu
Hiroshi Kamematsu
Masaya Nishiyama