Hand-held magnetic contact tachometer with toothed rotatable wheel
US5250896A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1991 |
| Grant date | Oct 5, 1993 |
| Priority date | — |
| Expiry date | Jul 12, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/488
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A hand-held contact tachometer includes an elongated hollow handle comprising two interconnected members defining a clevis at one end thereof and carrying therewithin a magnetic sensor disposed adjacent to the clevis and conditioning circuitry coupled to the output of the sensor. The clevis has hub portions defining an axle on which is rotatably mounted a contact wheel of molded construction including a body of non-magnetic material in which is embedded a toothed magnetic wheel and a bearing. The wheel is provided with a frictional ribbed surface on its outer periphery to facilitate engagement with an associated moving surface, thereby rotating the wheel to generate a pulsating signal having a frequency proportional to the speed of the moving surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.