Construction of sole unit for footwear
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United States of America Patent
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Mar 15, 1988
Grant Date -
N/A
app pub date -
Apr 4, 1986
filing date -
Apr 4, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention is in a sole unit for footwear including a midsole/wedge component (16, 30, 40, 60) of plastic material. The midsole/wedge component includes a core (26, 36, 46, 62) which may be characterized as a V-channel within a central longitudinal portion extending away from the back of the heel along substantially the longitudinal axis of the component. A pair of posts (22 and 24, 32 and 34, 42 and 44, 64 and 66) describing a lateral and medial post extend along the component at least to the region of the heel seat of the wedge. The density of the medial post (Shore A) may be equal to or greater than the density of the lateral post, and both posts have a density (Shore A) greater than that of the core to minimize excessive rear foot motion and instability. The invention also envisions several process for forming the midsole/wedge component.
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