Method of fusing a sight glass to a metal part
US4224047A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 25, 1979 |
| Grant date | Sep 23, 1980 |
| Priority date | — |
| Expiry date | Jan 25, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C27/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The instant invention provides, in combination, a metal part having a cylindrical opening, a chamfer below the cylindrical opening, and an aperture below the chamfer, the diameter of the cylindrical opening being less than the diameter of the aperture at the juncture of the aperture and the chamfer, and glass fused only to the wall of the cylindrical opening. The invention also provides a method of fusing a glass sphere to a metal part, comprising providing the metal part with a cylindrical opening, a chamfer below the cylindrical opening, and an aperture below the chamfer, the diameter of the cylindrical opening being less than the diameter of the aperture at the juncture of the aperture and the chamfer, placing a glass sphere having a diameter slightly larger than the diameter of the cylindrical opening within the cylindrical opening, and heating the glass sphere sufficiently to soften the glass whereby the glass will flow downwardly by gravity through the cylindrical opening to the juncture of the cylindrical opening and the chamfer, and wherein the downward flow of the glass is limited by cohesive forces in the glass that substantially prevent the glass from flowing radially ou…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.