Spring plate shoe
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United States of America Patent
Stats
-
Oct 1, 1991
Issued Date -
N/A
app pub date -
Apr 18, 1990
filing date -
Dec 8, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An athletic shoe with a spring plate in combination with a viscoelastic midsole, such spring plate extending substantially the length of the midsole from the medial side of the heel through the arch where the spring plate is curvilinear and on the exterior of the shoe, through the metatarsal head area and beneath the toes. The spring plate is of multiple layers, each of parallel carbon fibers embedded in polymer, the fibers being at acute angles in successive layers, in symmetry. The stiffness of the plate is anisotropic, being greater longitudinally than laterally. The thickness of the plate forward of the metatarsal break line is half that of the plate rearwardly of the break line.
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