Triple density gel heel cups
A triple density heel cup is disclosed which comprises a generally heel-shaped substrate having a length extending from a heel portion of an integral wall to a front border, which front border in use is adapted to underlie a portion of the arch area of a human foot. The heel-shaped substrate comprises a structural gel layer having a foot receiving surface and a shoe side surface. A generally flat portion of the foot receiving surface will lie adjacent the bottom of a wearer's foot in use and the integral wall which is adapted to lie adjacent the back of wearer's heel and portion of the side of a wearer's heel in use, said integral wall having an apex of maximum height, said wall tapering down in height from said apex toward said front border; The shoe side surface defines a channel formed in said structural gel adapted to receive a reinforcing component which is secured to said structural gel in said channel and is made of a denser material than said structural gel. This provides support to the heel cup and the foot A heel cushion is secured to said structural gel in a heel cushion area defined by the structural gel on the bottom surface of the heel cup. In a preferred embodiment, the heel cushion utilizes honeycomb technology to provide increased cushioning and energy return.
1. A triple density heel cup, comprising:
a generally heel-shaped substrate having a length extending from a heel back wall to a front border, which front border is positioned to underlie a portion of the arch area of the bottom of a wearer's foot when in use;
said heel-shaped substrate comprising a structural gel layer having a foot receiving surface and a shoe side surface;
said foot receiving surface having a flat area which is adapted to underlie the bottom of a wearer's foot in use and an upwardly extending integral wall which is adapted to lie adjacent the back and sides of said wearer's heel in use, said integral wall having a back apex of maximum height, said integral wall tapering down in height from said back apex toward said front border;
said shoe side surface defining a channel formed in said structural gel layer adapted to receive a reinforcement component;
a reinforcement component secured to said structural gel layer in said channel; said reinforcement component comprising a denser material than said structural gel layer, said reinforcement component having a curvature complementary to said upwardly extending integral wall in the area of the back of the heel, said curvature descending downwardly toward the base of the heel cup and then extending along the side of the heel cup and forward to said front border;
said shoe side surface further defining a heel cushion area; and
a heel cushion secured to said structural gel layer in said heel cushion area.
2. The heel cup of claim 1 , wherein said heel cushion comprises a second density gel.
3. The heel cup of claim 2 , wherein said second density gel integrally forms a honeycomb pattern.
4. The heel cup of claim 1 , wherein said structural gel layer is selected from thermoplastic polyurethane elastomer gel and thermoplastic rubber gel.
5. The heel cup of claim 1 , wherein said reinforcement component is made of material selected from the group consisting of polypropylene, polyvinyl chloride, thermoplastic vulcanizate and thermoplastic rubber.
6. The heel cup of claim 5 , wherein said reinforcement component is made of thermoplastic rubber.
7. The heel cup of claim 6 , wherein said reinforcement component has a hardness of about 70±3 Asker C.
8. The heel cup of claim 1 , wherein said reinforcement component further comprises scoring marks.
9. The heel cup of claim 1 , wherein said structural gel layer has a compression set <11±2%.
10. The heel cup of claim 1 , wherein said structural gel layer has a tensile strength and tear strength of around 1.2 MPa and 12 kN/m.
11. The heel cup of claim 1 , wherein said structural gel layer has a breaking elongation rate of about 900%.
12. The heel cup of claim 1 , wherein said structural gel layer has a Shore/Asker hardness of about 24±3 Asker C.
13. The heel cup of claim 2 , wherein said heel cushion has a compression set of about <11±2% , a tensile and tear strength of about 1.0 MPa and 10.6 kN/m, and a breaking elongation rate of about 950%, and a Shore/Asker Hardness of about 20±3 Asker C.
14. The heel cup of claim 2 , wherein said heel cushion comprises thermoplastic rubber gel.