Method for controlling taper pipe thread and corresponding control devices
US6502041B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2001 |
| Grant date | Dec 31, 2002 |
| Priority date | — |
| Expiry date | Jan 24, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B5/241
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for the inspection of male or female tapered threads located at the extremities of metal pipes. The pitch diameter of the threads in a measuring plane located substantially in the middle of a zone of perfect threads is inspected using a plane diameter measuring device while the pitch diameter of the threads is conventionally defined by the specification API 5B in the plane of the last perfect male thread. The pitch diameter of the threads measured is compared with an estimated value calculated from the nominal value of the pitch diameter in the plane P0, from the distance between P0 and P1, and a plot value for the taper, itself a function of the distribution of the tapers formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.