Variable pitch resistance coil heater
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United States of America Patent
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Aug 24, 2021
Grant Date -
Jun 27, 2019
app pub date -
Mar 5, 2019
filing date -
May 25, 2012
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Abstract
A resistance element includes a resistance coil having a first end and a second end opposite the first end. The resistance coil defines a plurality of first portions defining a first constant diameter and a plurality of second portions defining a second constant diameter smaller than the first diameter. At least one of the first portions and the second portions has a continuously variable pitch. The resistance coil may also further define two third portions, each third portion being disposed adjacent to a corresponding first or second end. The resistance element may be disposed between first and second conducting pins in a heater.
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