Thermal ratchet system
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United States of America Patent
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Aug 18, 2015
Grant Date -
Oct 16, 2014
app pub date -
Jun 25, 2014
filing date -
Oct 24, 2011
priority date (Note) -
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Abstract
A thermal ratchet system includes a ratchet housing, a ratchet mandrel, a first ratchet, and a second ratchet. The first ratchet is disposed at a position generally fixed with respect to the ratchet housing and is urgeable with respect to the ratchet mandrel in an axial direction by a change in environmental temperature in a first direction. The second ratchet is disposed at a position generally fixed with respect to the ratchet housing and is urgeable with respect to the ratchet mandrel in the axial direction by a change in environmental temperature in a second direction opposite to the first direction. At least one of the first ratchet and the second ratchet is engaged with the ratchet mandrel.
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