Method of sealing a pump stem to a cathode ray tube envelope par

Details Method of sealing a pump stem to a cathode ray tube envelope par Method of sealing a pump stem to a cathode ray tube envelope par

1986-04-24

1989-04-11

Rowan, Kurt

Electric lamp or space discharge component or device manufacturi

Process

With assembly or disassembly

228113, B23K 2700, H01J 926

Patent

active

048202258

ABSTRACT:
A cathode ray display tube has a mild steel envelope part (10) with a tubular copper pump stem (20) sealingly attached thereto by friction welding. A method of attaching the pump stem involves forming the pump stem initially with a closed end, rotating the pump stem relative to and against the mild steel envelope part and applying pressure to cause friction welding of the pump stem, and thereafter extending the pump stem's bore through its closed end by drilling. A hole may simultaneously be drilled through the envelope part. The friction weld provides reliable vacuum-tightness and strength, and the attachment of the pump stem in this manner can be accomplished using automation quickly and inexpensively.

REFERENCES:
patent: 3147053 (1964-09-01), Phelps
patent: 3451121 (1969-06-01), Yocum
patent: 3477116 (1969-11-01), Calton
patent: 3485931 (1969-12-01), Williams
patent: 3916518 (1975-11-01), Jones
patent: 4512488 (1985-04-01), Schwenk

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