Electric heating – Metal heating – By arc
Reexamination Certificate
2006-05-19
2008-09-09
Paschall, Mark H (Department: 3742)
Electric heating
Metal heating
By arc
C219S121520, C219S121480, C313S231310
Reexamination Certificate
active
07423235
ABSTRACT:
A threaded connection for an electrode holder and an electrode in a plasma arc torch is provided. The threaded connection has relatively low height, and the engaged portion of a male threaded portion of the electrode and a female threaded portion of the electrode holder are positioned at least partially within a nozzle chamber. In one inventive aspect, the nominal pitch diameter of the electrode is less than the minor diameter of the electrode. In another, the width of the root area of the electrode thread is wider than the width of the root area of the electrode holder thread by at least about 35%. The width of the root area of the electrode is at least about 15% wider than the width of the crest portion of the electrode. As such, the less consumable of the two parts, the electrode holder, is provided with a thread that is less likely to be worn and damaged. In one particular embodiment, the crest profile of the electrode is that of a Stub Acme thread separated by a larger root profile.
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ASME/ANSI B1.8-1988 Stub Acme Screw Threads; American National Standards for Screw Threads; 1988; pp. 1-30; The American Society of Mechanical Engineers.
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Chart—Dimension Values for Various Conventional Threads.
Drawing—Esab PT-26 Torch.
Alston & Bird LLP
Paschall Mark H
The ESAB Group, Inc.
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