Energy storage and return spring
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United States of America Patent
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Apr 29, 2014
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N/A
app pub date -
May 30, 2008
filing date -
Sep 6, 2007
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Abstract
A spring shoe, and also in particular a spring, as well as a method of returning energy to a user, are provided. In one embodiment, a method and apparatus stores foot strike energy and releases it after a slight delay, when it will exert a force on the user which includes a forward component. This is accomplished in an embodiment by a spring in the sole which has a decreasing spring force, such that the force required to compress the sole decreases for all or part of the compression displacement as the spring is compressed.
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