Shoe having impact absorption means
AssigneeInterco Incorporated
InventorsErnest S. Mann, Carlos B. Paytuvi, Roy V. Nolting, Thomas F. Riha
Life of this patent
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Abstract
A shoe having an insole with a forepart of leather having the characteristics of upper leather and a back part of fiberboard. A sheet layer of foam material, such as microcellular polyurethane, is cemented to the lower surface of the forepart and a foam cushion, preferably molded of microcellular polyurethane, overlies the back part. The back part of the insole has an opening through it and the foam cushion has a central portion that projects downwardly through the opening thereby providing a thickened foam at the central portion to maximize cushioning at the area of the heel strike. The invention is incorporated in shoes of both the welt-type construction and the cement-type construction.
Claims11
A shoe comprising:
- an upper portion,
- an insole joined to the upper portion, and
- an outsole portion joined to the insole portion,
- the insole portion have a forepart comprising a layer of shoe upper leather of a thickness in the range of at least 21/2 ounces and less than 5 ounces and a layer of foam material,
- the forepart having a back margin,
- the foam layer being located between the leather layer and the outsole and extending over substantially the entire area directly below the insole forepart of the shoe,
- the insole portion having a back part comprising a layer of generally stiff material extending over the heel area of the shoe and having a front margin,
- means for adhering the front margin of the back part to the back margin of the forepart thereby forming a composite insole having a forepart of upper leather within said range of thickness and a back part of generally stiff material,
- an opening through the layer of stiff material in the central portion of the heel area, and
- a foam cushion overlaying the back part of the insole and having a thickened central area projecting into and through the opening in the back part whereby the strike impact of the heel of a human foot wearing the shoe will be at the thickened central area.
A method of making a shoe comprising the steps of:
- providing an insole having a forepart and a back part wherein the forepart is of upper leather the thickness of which is between about two ounces and five ounces and the back part is of a material stiffer than that of the forepart,
- adhering a rear margin of the forepart to a front margin of the back part,
- providing a hole through the back part opening through the top and bottom surface thereof,
- forming a foam cushion having a generally flat central projection sized to fit through the hole and having a depth substantially equal to the depth of the hole between the top and bottom surfaces of the back part,
- locating the foam cushion over the back part with the central projection directed downwardly through the hole,
- securing the foam cushion to the insole in the located position,
- drawing an upper over a last and adhering a lasting allowance of the upper to a peripheral area of the insole,
- locating a sheet of foam within the area of the forepart and adhering the sheet of foam to the insole,
- and adhering an outsole and heel to the insole.
Dependencies are inferred from the claim text.