Expandable pistons
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United States of America Patent
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Aug 11, 2020
Grant Date -
N/A
app pub date -
Jul 10, 2019
filing date -
Mar 29, 2019
priority date (Note) -
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Abstract
A piston is arranged to move in a cylinder to define a variable volume chamber, and can expand in two directions under the influence of pressure in the variable volume chamber to provide sealing against the cylinder. The piston can comprise a primary foot and a secondary foot arranged to move relative to each other in a first direction. The primary foot and the secondary foot can each comprise plural segments arranged to move relative to each other in a second direction. The piston may be suitable for use in an inner rotor, where it forms the end of a projection of the inner rotor and fully exits and reenters the cylinders.
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