Glass manufacturing – Processes – Fusion bonding of glass to a formed part
Patent
1979-01-25
1980-09-23
Fisher, Richard V.
Glass manufacturing
Processes
Fusion bonding of glass to a formed part
65 59R, C03C 2702
Patent
active
042240476
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 outwardly along the chamfer, and whereby the softened glass becomes fused to the wall of the cylindrical opening.
REFERENCES:
patent: 2744487 (1956-05-01), Moore et al.
patent: 2946156 (1960-07-01), Bailey
patent: 3281606 (1966-10-01), Lueck
patent: 3288585 (1966-11-01), Clarke
patent: 3347651 (1967-10-01), Lueck
patent: 3424568 (1969-01-01), Martin et al.
patent: 3582300 (1971-06-01), Coombes et al.
patent: 3888205 (1975-06-01), Vitticore et al.
patent: 3930824 (1976-01-01), Knowles
Bell Edward L.
Fisher Richard V.
Smith Robert E.
The Singer Company
Trygg James M.
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