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54. 发明专利

JP3062820B2 失效
公开(公告)号：JP3062820B2
公开(公告)日：2000-07-12
申请号：JP25251289
申请日：1989-09-29
IPC分类号： E21B17/02 , E21B17/042 , E21B17/08 , F16J15/00 , F16L15/00 , F16L15/04 , F16L15/06

57. 发明专利

JPH05272668A 失效
公开(公告)号：JPH05272668A
公开(公告)日：1993-10-19
申请号：JP9929291
申请日：1991-04-30
IPC分类号： E21B17/042 , F16L15/00 , F16L15/06
摘要： PURPOSE: To improve compressive and bending strengths of a thread by forming the thread, such that flanks of the respective thread members come into contact with the range of at least a part of the thread length, when applying torque larger than the torque that brings a torque shoulder of a box member in a tube fitting into the first contact with a torque shoulder of a pin member. CONSTITUTION: When a casing pipe and a tube pipe in petroleum and gas industries are connected with a screw coupling, a pin thread 4 to be provided on a pin member having a central axis 3 is formed by a top of thread 14, a bottom of thread 10, a loading flank 8, and a sinking flank 6. The respective flanks 8, 6 are formed so as to extend from the top of thread 14 and the bottom of thread 10 making angles A, B with respect to the radial lines perpendicular to the central axis 3. The angle B is chosen, such that an angle C made by both flanks 6, 8 is larger than 0 deg.. In addition, the thread of a box member is formed so as to correspond to the pin thread 4, and a length L2 of the top of the box thread 11 is formed larger than the length L1 of the bottom 10.

58. 发明专利

JPH05133490A HIGH TORQUE TOOL JOINT 失效
公开(公告)号：JPH05133490A
公开(公告)日：1993-05-28
申请号：JP31960791
申请日：1991-11-08
申请人： NIPPON KOKAN KK
发明人： HORI MITSUAKI , EBIHARA YUKIHIKO , WADANO KATSUMI
IPC分类号： E21B17/042 , F16L15/00 , F16L15/06
摘要： PURPOSE:To provide a tool joint that imparts an internal shoulder too to the conventional API tool joint with an external shoulder, enduring any excessive torque during application, and has interchangeability with the API tool joint for convenience sake. CONSTITUTION:In a tool joint of a drill pipe with a pair of internal and external thread parts 4 and 3 at both ends of a pipe, each of shoulder parts 8 and 6 is formed in an outer side of the external thread part 3 and an inner side of the internal thread part 4 and the joint is made so as to be flatly contacted at two spots, while length of up to a tip part 7 from the shoulder part formed at the pipe side of each thread part and engaging depth with the shoulder side of a universal tool joint are set to be smaller than the engaging depth at the internal thread side of the universal joint, and a clearance with the inner surface shoulder part at hand time is set to a range of 0-0.5mm.

60. 发明专利

JPH033834B2 失效
公开(公告)号：JPH033834B2
公开(公告)日：1991-01-21
申请号：JP18388084
申请日：1984-09-04
申请人： KAWASAKI SEITETSU KK , HANCHINGU OIRU SAABISHIZU YUU KEE LTD
发明人： UENO TAKEO , JOOFURII KEEBU DEAADEN , EDOWAADO JEFURII SUPEAA , DONARUDO NOOMAN JONZU
IPC分类号： F16L15/04 , E21B17/042 , F16L15/06

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