Footwear cleat with inward traction elements

1. A cleat securable to the sole of a shoe for providing traction for the shoe on a ground surface, the cleat comprising:

a hub having a longitudinal axis oriented perpendicular to the hub and vertically when the sole of the shoe is on the ground, said hub having an exposed bottom surface facing away from the shoe sole when the cleat is secured to the shoe;

a plurality of traction elements each having a root at its proximal end secured to the bottom surface of said hub and a tip at its distal end remote from said hub, at least one of said traction elements being flexible and extending at an angle from the hub both downwardly from the bottom surface and inwardly toward said axis such that said tip is closer than said root to said longitudinal axis when said one traction element is unflexed; and

a cleat connector member provided in an upper surface of the hub facing oppositely of the bottom surface, wherein said connector is securable to a shoe connector member.

2. The cleat of claim 1 , wherein said at least one traction element is a dynamic traction element extending from the hub in a direction away from the exposed bottom surface of the hub and inwardly toward said axis, the dynamic traction element being configured to resiliently deflect toward the hub and the longitudinal axis when the shoe sole is forced against the ground surface.

3. The cleat of claim 2 , wherein said dynamic traction element has an outwardly facing surface with a proximal section forming an acute angle with the hub.

4. The cleat of claim 3 , wherein said acute angle is in a range between 35° and 80° to inwardly bias flexure of the dynamic traction element under load.

5. A cleat securable to the sole of a shoe for providing traction for the shoe on a ground surface, the cleat comprising:

a hub having a longitudinal axis oriented perpendicular to the hub and vertically when the sole of the shoe is on the ground, said hub having an exposed bottom surface facing away from the shoe sole when the cleat is secured to the shoe;

a plurality of traction elements, at least one of said traction elements extending at an angle from the hub both downwardly from the bottom surface and inwardly toward said axis; and

a cleat connector member provided in an upper surface of the hub facing oppositely of the bottom surface, wherein said connector is securable to a shoe connector member;

wherein said dynamic traction element has a proximal end joined to said hub at an intersection, and a distal end at which the traction element is most remote from the hub, and wherein the distal end is closer to said axis than every point along said intersection.

6. A cleat securable to the sole of a shoe for providing traction for the shoe on a around surface, the cleat comprising:

a hub having a longitudinal axis oriented perpendicular to the hub and vertically when the sole of the shoe is on the ground, said hub having an exposed bottom surface facing away from the shoe sole when the cleat is secured to the shoe;

a plurality of traction elements, at least one of said traction elements extending at an angle from the hub both downwardly from the bottom surface and inwardly toward said axis; and

a cleat connector member provided in an upper surface of the hub facing oppositely of the bottom surface, wherein said connector is securable to a shoe connector member;

wherein said dynamic traction element has a distal end at which the traction element is most remote from the hub, wherein the distal end is closer to said axis than the remainder of the dynamic traction element, and wherein the distal end extends slightly upward toward said hub.

7. A cleat securable to the sole of a shoe for providing traction for the shoe on a ground surface, the cleat comprising:

a hub having a longitudinal axis oriented perpendicular to the hub and vertically when the sole of the shoe is on the ground, said hub having an exposed bottom surface facing away from the shoe sole when the cleat is secured to the shoe;

a plurality of resiliently flexible dynamic traction elements, each having a root at its proximal end secured to the bottom surface of said hub and a tip at its distal end remote from said hub, and each cantilevered at an angle from the hub both downwardly from the bottom surface and inwardly toward said axis such that when unflexed said tip is closer than said root to said longitudinal axis to bias the traction elements to flex both radially inwardly and upward toward the hub under the weight of a wearer of the shoe; and

a cleat connector member provided in an upper surface of the hub facing oppositely of the bottom surface, wherein said connector is securable to a shoe connector member.

8. The cleat of claim 7 , wherein each dynamic traction element has an outwardly facing surface with a proximal section forming an acute angle with the hub.

9. The cleat of claim 8 , wherein said acute angle is in a range between 35° and 80°.

10. A cleat securable to the sole of a shoe for providing traction for the shoe on a ground surface, the cleat comprising:

a hub having a longitudinal axis oriented perpendicular to the hub and vertically when the sole of the shoe is on the ground, said hub having an exposed bottom surface facing away from the shoe sole when the cleat is secured to the shoe;

a plurality of resiliently flexible dynamic traction elements each cantilevered at an angle from the hub both downwardly from the bottom surface and inwardly toward said axis to bias the traction elements to flex both radially inwardly and upward toward the hub under the weight of a wearer of the shoe; and

a cleat connector member provided in an upper surface of the hub facing oppositely of the bottom surface, wherein said connector is securable to a shoe connector member

wherein each dynamic traction element has a proximal end joined to said hub at an intersection, and a distal end at which the traction element is most remote from the hub, and wherein the distal end is closer to said axis than every point along said intersection.

11. A cleat securable to the sole of a shoe for providing traction for the shoe on a ground surface, the cleat comprising:

a hub having a longitudinal axis oriented perpendicular to the hub and vertically when the sole of the shoe is on the ground, said hub having an exposed bottom surface facing away from the shoe sole when the cleat is secured to the shoe;

a plurality of resiliently flexible dynamic traction elements each cantilevered at an angle from the hub both downwardly from the bottom surface and inwardly toward said axis to bias the traction elements to flex both radially inwardly and upward toward the hub under the weight of a wearer of the shoe; and

a cleat connector member provided in an upper surface of the hub facing oppositely of the bottom surface, wherein said connector is securable to a shoe connector member;

wherein each dynamic traction element has a distal end at which the traction element is most remote from the hub, wherein the distal end is closer to said axis than the remainder of the dynamic traction element, and wherein the distal end extends slightly upward toward said hub.

12. The cleat of claim 11 , wherein each dynamic traction element includes in interiorly facing longitudinally arcuate surface having a radius of curvature which is smaller than the radius of the periphery of said hub.

13. The cleat of claim 12 , wherein the bottom surface of said hub is convex and has a radius of curvature greater than the radius of curvature of the hub periphery.