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Shoe sole incorporating spring apparatus

  • US 4,910,884 A
  • Filed: 04/24/1989
  • Issued: 03/27/1990
  • Est. Priority Date: 04/24/1989
  • Status: Expired due to Fees
First Claim
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1. A shoe sole for incorporation into a shoe for use by a user and incorporating spring apparatus,said shoe sole having an upper side and a cavity in said upper side, said cavity having a planform and a depth,said cavity having a heel portion and a toe portion,said spring apparatus comprising a heel spring, a toe spring and a bridge,said heel spring having an essentially elliptical cross-section, a wall thickness, a height, a planform and a maximum deflection,said toe spring having an essentially elliptical cross-section, a wall thickness, a height, a planform and a maximum deflection,said planform of said heel spring conforming to said heel portion of said cavity such that said heel spring fits snugly but freely in said heel portion of said cavity,said planform of said toe spring conforming to said toe portion of said cavity such that said toe spring fits snugly but freely in said toe portion of said cavity,said bridge being a flat spring having a thickness and a planform, said planform conforming to said sole cavity planform such that said bridge fits snugly but freely in said cavity,said heel spring being inserted into said heel portion of said cavity,said toe spring being inserted into said toe portion of said cavity,said bridge being inserted into said cavity over said heel and toe springs,the sum of said height of said heel spring and said thickness not exceeding said depth andthe sum of said height of said toe spring and said thickness not exceeding said depth.

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