Electric heating – Metal heating – Cutting or disintegrating
Reexamination Certificate
2006-11-21
2009-10-20
Evans, Geoffrey S (Department: 3742)
Electric heating
Metal heating
Cutting or disintegrating
C219S069200
Reexamination Certificate
active
07605339
ABSTRACT:
A method is provided for electrical discharge machining (EDM) a workpiece to include an annular undercut having a curved cross-sectional shape. The annular undercut is useful, for example, in making devices such as the tooling for plastic injection-molding of plastic parts including crab's claw seals. According to embodiments of the method, a workpiece is rotated about a central workpiece axis. An energized EDM electrode is moved in a plane containing the central axis and about an electrode axis generally perpendicular to the plane toward the rotating workpiece to provide a spark gap between the shaped electrode tip and the body. At least portions of the undercut are then formed by the EDM electrode as the workpiece is rotated. Devices made according to the forming methods are described.
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USPTO Manual of Patent Classification, Electric Spark Machining.
Evans Geoffrey S
Jansson & Shupe & Munger Ltd.
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