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Inflatable sole lining for shoes and boots

  • US 5,025,575 A
  • Filed: 10/27/1989
  • Issued: 06/25/1991
  • Est. Priority Date: 03/14/1989
  • Status: Expired due to Fees
First Claim
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1. The combination of an inflatable sole lining having a sealed interior and a supporting underlayment for footwear which comprises:

  • a. a laminate of first and second sheets of plastic having the size and shape of the sole of said shoe and bonded together by a first peripheral seam about their peripheral edges to form said sealed interior and having a plurality of interconnected air flow passageways within said sealed interior and defined by tubular means extending across the surface of the sole lining and forming air channels on the top and under surfaces of said lining; and

    b. inflation means comprising;

    (1) a flexible and resilient bulb;

    (2) an inlet port opening into said bulb;

    (3) a discharge port communicating from said bulb to said sealed interior of said sole lining;

    (4) a pair of check valves with one each of said check valves being positioned in a respective one of said inlet and discharge ports in opposite flow directions, whereby said bulb functions as a pump, to increase the pressure of air within said sealed interior; and

    (5) pressure control means having a manually adjustable valve to control and maintain a desired inflation pressure within said sealed interior; and

    c. substantially flat support sheet beneath and coextensive with said laminate.

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