专利名称：Thread form
发明人：DeLange, Richard Werner,Evans, Merle
Edward,Anderson, Donna Saunders
truncated form
申请号：EP91106799.9
申请日：19910426
公开号：EP0454147A2
公开日：
19911030
专利内容由知识产权出版社提供
专利附图：
摘要：A truncated buttress-type thread form incorporates a reverse-angle tension load flank (8,9) with a compression flank and a torque shoulder; the thread does not have any radial interference designed into it, but the hooked tension flank does tend to pull
the pin (1) and box (2) together once the torque shoulder is engaged. The mating compression flanks
have designed into them a minimum amount of clearance prior to the shouldering action, which then closes to zero or very near zero at the moment the shoulder is engaged. This drawing together is due to the tendency of the hooked threads to pull together at shouldering if there exists no radial interference in the thread body. The thread roots and crests can be tapered, parallel to the taper of the thread body, or flat and parallel to the pipe axis but maintain adequate clearance to allow some closure once the shoulder is engaged so that the compression flanks can draw together.
申请人：BAKER-HUGHES INCORPORATED
地址：3900 Essex Lane Suite 1200 Houston Texas 77027-5115 US
国籍：US
代理机构：Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät
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