Level with top-reading magnification
US5105549A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 14, 1991 |
| Grant date | Apr 21, 1992 |
| Priority date | — |
| Expiry date | Jun 14, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C9/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A level is provided with a top-reading feature, allowing a vial to be viewed through the upper flange of the level. A magnifying element is disposed between the vial and an opening formed in the upper flange, to magnify the vial when it observed from the top of the level. The magnifying element is preferably formed integrally with a transparent lens, which is retained between a vial cover and a side of the web of the level frame. Complementary structure is provided on the lens on the opposite side of the web, for sealing the internal cavity defined by the vial covers, in combination with the lenses, to prevent entry of dirt or other foreign material into the cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.