Blocked lens thickness gauge
US4674190A · kind A · utility
2Cited by
9References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 17, 1985 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | May 17, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B5/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed is a blocked lens thickness gauge for measuring the thickness of a semi-finished lens that is blocked for surfacing of the concave side thereof. A lens contacting sensor shaft is supported between two sets of orthogonally mounted ball bearings and a needle shaft, the latter being supported on spring-loaded bearings such that the needle shaft is urged toward the lens contacting sensor shaft by the spring loading. A slipping clutch is also provided to allow the needle shaft to absorb inertia forces resulting from abnormal shocks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.