Sole structure of a sports shoe
A sole structure of a sports shoe includes an outsole and an intermediate sole having a number of portions that is flexible and supports the foot during running. The intermediate sole includes a flexible body element extending along the entire length of the shoe, and a flexible heel absorption element extending to the heel area, and a support element fitted between them extending from the heel area to the ball area which is of a less flexible material than the body element or the heel absorption element. The support element includes a substantially plate-like heel portion and a shaped front portion, which are separated from each other by a substantially cross-directional support ridge protruding from the lower surface of the support element. The intermediate sole also includes an hourglass-shaped ball absorption element, a carbon fiber plate increasing the torsional rigidity of the support element and an arch support.
1. A sole structure of a sports shoe, comprising:
an outsole ( 11 ); and
a midsole ( 10 ), which is flexible and supports a foot during running, the midsole ( 10 ) comprising:
a flexible body element ( 12 ) extending along an entire length of the sport shoe;
a flexible heel absorption element ( 13 ) extending to a heel area of the shoe; and
a support element ( 14 ), which is sandwiched between the flexible body element ( 12 ) and the flexible heel absorption element ( 13 ) and extends from the heel area to a ball area of the sport shoe, and which is of a less flexible material than the flexible body element ( 12 ) or the flexible heel absorption element ( 13 ),
wherein the support element ( 14 ) comprises a heel portion ( 17 ) and a shaped front portion ( 18 ), which are separated from each other by a support ridge ( 19 ) protruding from the lower surface of the support element ( 14 ), and
wherein the support ridge ( 19 ) comprises two bulges ( 19 a , 19 b ), the first one ( 19 a ) of which, located close to the medial edge of the shoe, is higher than the other one ( 19 b ), located close to the lateral edge of the shoe, and between said first and second bulges ( 19 a , 19 b ) there is an area ( 19 c ) where the support ridge ( 19 ) is lower than the bulges ( 19 a , 19 b ).
2. The sole structure according to claim 1 , further comprising a carbon fibre plate ( 21 ) fitted to a depression ( 21 ) in the upper surface of the support element ( 14 ), wherein a rigidity of the carbon fibre plate along a direction across the carbon fibre plate is higher than along a direction longitudinal along the carbon fibre plate.
3. The sole structure according to claim 2 , wherein the carbon fibre plate ( 21 ) extends farther below the ball area of the sport shoe at the side of the lateral edge of the sport shoe than at the side of the medial edge of the sport shoe.
4. The sole structure according to claim 2 , further comprising a polygonal opening ( 22 ) at the rear part of the carbon fibre plate ( 21 ), which increases the flexibility of the support element ( 14 ) equipped with the carbon fibre plate ( 17 ) during heel impact.
5. The sole structure according to claim 1 , further comprising a ball absorption element ( 16 ), which is fitted in a depression ( 15 ) in the flexible body element ( 12 ) and extends to a substantial part of the width of the sport shoe at the ball area of the sport shoe.
6. The sole structure according to claim 5 , wherein the ball absorption element ( 16 ) is shaped like an hourglass having a narrow inner portion separating wider outer portions.
7. The sole structure according to claim 6 , wherein the width of the ball absorption element ( 16 ) is larger at the medial edge of the sport shoe than at the lateral edge of the sport show.
8. The sole structure according to claim 1 , further comprising an arch support ( 23 ) fitted below the support element ( 14 ).
9. The sole structure according to claim 1 , wherein the body element and the heel absorption element ( 12 , 13 ) are of a polymer material whose hardness is 50 to 55 Shore C and the support element ( 14 ) is of a polymer material whose hardness is 60±3 Shore C.
10. The sole structure according to claim 9 , wherein said polymer material is ethylvinylacetate or comparable.
11. The sole structure according to claim 1 , wherein the outsole ( 11 ) is of a rubber material whose hardness is 60±3 Shore C and it includes a portion located below the ball of the foot whose hardness is about 65 Shore C.
12. The sole structure according to claim 1 , further comprising a carbon fibre plate ( 21 ) fitted to a depression ( 21 ) in the upper surface of the support element ( 14 ), wherein a rigidity of the carbon fibre plate along a direction across the carbon fibre plate is higher than along a direction longitudinal along the carbon fibre plate.
13. The sole structure according to claim 12 , wherein the carbon fibre plate ( 21 ) extends farther below the ball area of the sport shoe at the side of the lateral edge of the shoe than at the side of the medial edge of the shoe.
14. The sole structure according to claim 3 , further comprising a polygonal opening ( 22 ) at the rear part of the carbon fibre plate ( 21 ), which increases the flexibility of the support element ( 14 ) equipped with the carbon fibre plate ( 17 ) during heel impact.
15. The sole structure according to claim 1 , further comprising a ball absorption element ( 16 ), which is fitted in a depression ( 15 ) in the body element ( 12 ) and extends to a substantial part of the width of the sport shoe at the ball area of the sport shoe.
16. The sole structure according to claim 1 , further comprising an arch support ( 23 ) fitted below the support element ( 14 ).
17. The sole structure according to claim 1 , wherein the body element and the heel absorption element ( 12 , 13 ) are of a polymer material whose hardness is 50 to 55 Shore C and the support element ( 14 ) is of a polymer material whose hardness is 60±3 Shore C.
18. The sole structure according to claim 1 , wherein the outsole ( 11 ) is of a rubber material whose hardness is 60±3 Shore C and it includes a portion located below the ball of the foot whose hardness is about 65 Shore C.
19. The sole structure according to claim 15 , wherein the ball absorption element ( 16 ) is shaped like an hourglass having a narrow inner portion separating wider outer portions.