Culletless main sealing method of cathode-ray tube

Details Culletless main sealing method of cathode-ray tube Culletless main sealing method of cathode-ray tube

1986-08-21

1988-11-01

Rowan, Kurt

Electric lamp or space discharge component or device manufacturi

Process

With assembly or disassembly

445 45, 445 22, H01J 926

Patent

active

047816392

ABSTRACT:
A culletless main sealing method comprising the steps of heating the end surface of a neck tube of a bulb by burners, pushing a stem to the end surface of the neck tube for welding the stem thereto, and pulling the stem to shape the welded portion. The burners are located at a predetermined constant distance from the plane containing the end surface of the neck tube, and the pushing distance and the pulling distance of the stem at the time of glass welding are determined in accordance with the length of the neck tube, whereby the allowable variation range of the length of the neck tube is enlarged.

REFERENCES:
patent: 2273439 (1942-02-01), Freeman
patent: 2321224 (1943-06-01), Madden
patent: 3369881 (1968-02-01), Bennett
patent: 3460879 (1969-08-01), Fletcher

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