Apparatus and method for moving a ferromagnetic element
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United States of America Patent
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Mar 18, 2008
Grant Date -
Oct 11, 2007
app pub date -
Aug 23, 2005
filing date -
Aug 27, 2004
priority date (Note) -
Expired
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Abstract
A device and technique for placing and moving a ferromagnetic element in an annulus between coaxially arranged cylindrical tubes. The device includes an electromagnetic ram moved along the interior of a cylindrical tube. The movable ferromagnetic element is magnetically coupled to the electromagnetic ram and moved by magnetic force to a location in the annulus defined by the tubes and magnetically coupled to the electromagnetic ram for movement in and removal from the annulus.
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