Joint with tapered threads
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
N/A
Issued Date -
Jul 17, 2003
app pub date -
Dec 6, 2002
filing date -
Jun 7, 2000
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
The gap L (mm) which is the smaller of the gap L.sub.1 (mm) between the crest 1a of a tapered male thread 1 and the root 2b of a tapered female thread 2, and the gap L.sub.2 (mm) between the root 1c of the tapered male thread 1 and the crest 2c of the tapered female thread 2, the load flank angle .alpha.(.degree.) and the stab flank angle .beta.(.degree.), and the axial gap .delta.(mm) which forms in the widthwise direction and is the difference between the thread ridge width of the tapered male thread 1 and the thread valley width of the tapered female thread 2 threadingly engaged therewith have the following relationship .delta..ltoreq.L.multidot.(tan .alpha.+tan .beta.) When interference of the threaded portions is necessary, the initial set thread interference H is H>2L. As a result, a thread having sufficient resistance to tensile force and compressive force can be easily manufactured within manufacturing tolerances. In particular, it has good sealing properties and increased reliability as a threaded joint for an oil well pipe having a metal seal portion.
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