Magnetic caliper with reference scale on edge
US7530177B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 2007 |
| Grant date | May 12, 2009 |
| Priority date | — |
| Expiry date | Nov 13, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B3/205
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic hand tool type caliper includes a scale track located along a scale member reference edge that forms a sliding bearing with a mating surface of the caliper slide, thereby maintaining proper alignment of the slide jaw. Placing the scale track along the reference edge is advantageous in that the reference edge surface is inherently precisely machined and particles are excluded by the inherently close fit and the wiping action of the sliding bearing. A readhead sensor is mounted within the slide surface that mates to the reference edge to provide the sliding bearing. Thus, a very small readhead sensor may be reliably positioned at an extremely small gap relative to the scale in a protected operating environment, without detrimentally affecting cost, slider friction, or signal strength. High resolution digital signals may be provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.