Polycast level instruments with means for retaining level vials therein
US4571845A · kind A · utility
Inventors
Key dates
| Filing date | Jan 30, 1984 |
| Grant date | Feb 25, 1986 |
| Priority date | — |
| Expiry date | Jan 30, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C9/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A specially contoured cavity or recess for the precise alignment and retention of a uniform cylindrical level vial in Polycast plastic level instruments or other hand tools. The recess is accurately oriented with respect to tool measuring surfaces during the Polycast molding process. The contoured cavity or recess is dimensioned to tightly receive the level vials thereby accurately indexing the vial in relation to the measuring surfaces. The retention recess has a semi-cylindrical contour and a vial receiving opening defined between a pair of opposed ridges. The ridges include a sloped vial receiving forward surface and extend inwardly into the receiving opening a selected dimension to permit entry and retention of the level vial.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.