Gas shroud and method
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United States of America Patent
Stats
-
Feb 7, 1989
Issued Date -
N/A
app pub date -
Jun 2, 1987
filing date -
Jan 7, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A gas shroud comprises a chamber having a beam inlet, a gas inlet and an outlet portion. A shroud having an inner surface and an outer surface is operably associated with the outlet portion and is rotatable relative to the chamber. A drive system is operably connected to the shroud for rotating the shroud. A plurality of fins are positioned about the outer surface of the shroud and are rotatable therewith so that rotation of the shroud causes the environment surrounding the shroud to be expelled radially away therefrom.
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