Pre-focussed incandescent lamps and method of assembling base th

Details Pre-focussed incandescent lamps and method of assembling base th Pre-focussed incandescent lamps and method of assembling base th

1983-11-22

1986-08-19

Ramsey, Kenneth J.

Electric lamp and discharge devices

With gas or vapor

Incandescent filament lamp

313318, 445 3, 445 27, H01J 934

Patent

active

046071920

ABSTRACT:
The invention provides an improved method of construction of a prefocus lamp, to improve positioning of the filament relative to the lamp cap, and a lamp so made. The lamp envelope has a pinch seal with V-shaped grooves into which a resilient ring is sprung. This assembly is a sliding fit in the lamp cap and is slid therein to have substantially only line contact between the ring and the cap. The envelope can then be relatively easily rocked and otherwise moved in the lamp cap to be precisely positioned. When the positioning is complete solder previously placed in the cap is melted, the position being such that it flows over the ring and fixes the ring to the lamp cap.

REFERENCES:
patent: 1760693 (1930-05-01), Gustin
patent: 1813572 (1931-07-01), Gustin
patent: 3188728 (1965-06-01), Perrin
patent: 4496874 (1985-01-01), Sanders et al.

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