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US 5,572,805 AGranted
Multi-density shoe sole
AssigneeComfort Products, Inc.
InventorsErik O. Giese, Roger J. Brown
Life of this patent
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Abstract
A composite shoe bottom is disclosed comprising a lower layer of firm material and an upper softer layer superposed thereon. Each layer has an upper contoured surface such that the total compressibility of the shoe bottom, as determined by the relative thicknesses of the layers, is predetermined and differs along the surface. The upper layer has an uppermost surface which is shaped to fit against and be complemental to the bottom of the foot of a wearer.
Claims40
A composite shoe bottom having a toe area, arch area and heel area comprising:
- a) a lower shaped layer of a material having a predetermined hardness and having a cross-sectional thickness which is increased around the periphery of the heel area and in the medial portion of the arch area to form a raised heel periphery and raised arch support and an irregular contoured upper stabilizing surface for the wearer's foot;
- and
- b) an upper cushioning layer of a material which is softer than the material of the lower layer and is superposed in face-to-face relation upon the upper surface of the lower layer, said upper layer having a varying thickness which is pre-shaped to a three-dimensional contour having an uppermost surface which is complementary to the bottom surface of the wearer's foot and an increased height around the periphery of the heel area and in the arch area, with the three dimensional contour in the arch area having a side-to-side height profile that varies along an arcuate path from a relatively lower point on the lateral portion of the layer to a relatively higher point on the medial portion of the layer to form a raised arch support, thereby providing an irregular contoured upper stabilizing surface for the wearer's foot;
- wherein the increased thickness of the lower layer in the heel area is positioned directly beneath the upper layer, the increased thickness of the raised arch support of the lower layer is positioned directly beneath the arch support of the upper layer, and the material of the upper and lower layers can flex, move and distort under the weight of the wearer without permanent deformation.
1 more element
Dependencies are inferred from the claim text.