Cathode ray tube having a friction welded tubular pump stem

Details Cathode ray tube having a friction welded tubular pump stem Cathode ray tube having a friction welded tubular pump stem

H - Electricity

01

J

316/18, 313/35.6

H01J 9/24 (2006.01) H01J 7/22 (2006.01) H01J 29/86 (2006.01)

Patent

CA 1268201

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.

508101

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