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US 4,052,638 AGranted
Flare-wedge lamp
AssigneeGeneral Electric Company
InventorsRobert J. Love, James C. Graff
Life of this patent
Estimating the term…
Abstract
An improved wedge-based lamp and method of manufacture are disclosed in which conductive leads and an exhaust tube are positioned and held in the pinch end of a flared section of glass tubing. After one or more filaments are attached to the leads and accurately positioned relative to the pinch end, an envelope is fastened to the flare to enclose the filaments and the lamp is exhausted or filled with inert gas(es) via the exhaust tube.
Claims16
An all-glass incandescent lamp comprising:
- a flare having a cylindrical portion and a conical portion;
- at least two conductive leads and an exhaust tube positioned within said flare;
- and
- wherein the cylindrical end of said flare is collapsed about said conductive leads and exhaust tube to form a base.
1 more element
An all-glass lamp comprising:
- a flare comprising a shell of revolution, a portion of which forms a cylinder;
- at least one pair of lead wires extending through said flare and at least one filament connected to said lead wires at the ends opposite said cylindrical portion;
- an exhaust tube extending through the cylindrical portion of said flare, said cylindrical portion being collapsed about said lead wires and exhaust tube to form a pinch end, and p1 an envelope sealed to the open end of said flare enclosing said filament.
A method for manufacturing an all-glass incandescent lamp comprising the steps of:
- softening and enlarging one end of a section of glass tubing to form a flare;
- collapsing the other end of said section of tubing about lead wires and an exhaust tube to form a pinch end;
- mounting at least one filament on the ends of the lead wires extending from the flared end of said section;
- sealing an envelope to the flared end of said section to form an enclosed space;
- evacuating said enclosed space by way of said exhaust tube;
- and
- sealing off said exhaust tube while maintaining a predetermined pressure in said lamp.
4 more elements
Dependencies are inferred from the claim text.