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公开(公告)号:US20060089976A1
公开(公告)日:2006-04-27
申请号:US11164079
申请日:2005-11-09
申请人: James Breihan , Raymond Chandler , Andrei Muradov
发明人: James Breihan , Raymond Chandler , Andrei Muradov
IPC分类号: G06F15/16
CPC分类号: F16L15/001 , E21B17/042
摘要: A thread form having improved strength and fatigue resistance. The root of the thread may be cut on multiple cutting radii having displaced centers. At least two of the root surfaces formed by cutting radii may have lengths that are greater than the root truncation. The threads may be used in a double start configuration to increase the connection strength and reduce makeup and breakout rotations.
摘要翻译: 具有改善的强度和耐疲劳性的螺纹形式。 螺纹的根部可以在具有移位中心的多个切割半径上被切割。 通过切割半径形成的至少两个根表面可以具有大于根截断的长度。 螺纹可以以双重启动配置使用,以增加连接强度并减少化妆和突破旋转。