Measuring device of thread parameters for threaded joints
US8855965B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 2011 |
| Grant date | Oct 7, 2014 |
| Priority date | — |
| Expiry date | Aug 21, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/2425
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Thread parameters for a threaded object are determined. Spatial reference systems (X, Y, Z) and (X′, Y′, Z′) are respectively identified for a position sensor and the threaded object. A transformation matrix describing a quadratic form representing the threaded object in (X, Y, Z) may be determined to relate the reference systems. For example, a sensor trajectory on the threaded object may be determined, along with measurement points on the threaded object. The measurement points may be selected so the matrix, evaluated on these values, has maximum rank. Position data at measurement points in the second reference system may be transformed into the first reference system, yielding first results. After coating the threaded object, position data at the measurement points may be acquired again and transformed into the first reference system, yielding second results. Comparisons between the first and second results may provide thickness of the coating and quality verification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.