Screw coupling joint
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United States of America Patent
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-
Jan 15, 1991
Issued Date -
N/A
app pub date -
Apr 21, 1988
filing date -
Apr 16, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A screw coupling joint having a sealing portion between an outer circumference formed in convex in an axial direction of the coupling joint at the end of the male screw portion and an inner circumference formed in taper at an inner part of the female screw portion. The female screw portion has a stopper end positioned to be contacted, when the coupling joint is assembled, by the inner end of the male screw portion. The taper is between 1.degree. and 3.degree. and the inner diameter D.sub.1 of the female screw and the outer diameter D.sub.2 of the male screw have the relationship D.sub.2 >D.sub.1 at a tangent point therebetween. The end of the male screw portion and the end of the stopper are vertical or perpendicular to the axis of the coupling joint.
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