Rotational speed sensor with membrane
US5670873A · kind A · utility
6Cited by
16References
12Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Nov 2, 1995 |
| Grant date | Sep 23, 1997 |
| Priority date | — |
| Expiry date | Nov 2, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/488
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
To prevent the adhesion or penetration of iron filings or other magnetically permeable material, thereby avoiding a short-circuit of the magnetic circuit and ensuring an accurate output signal, a membrane comprised of a non-magnetic material covers the bottom of a casing facing a rotor, and a protuberance of a length at least equal to the maximum air gap between the membrane and the rotor is integrally molded to a portion of the membrane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.