Sole for footwear having a turnable antislip device and footwear comprising such sole

1. A sole for footwear provided with at least one turnable antislip device on the tread surface of said sole operatively facing the sole, the antislip device comprising:

an articulation structure mounted on the tread surface and oscillatable moving away from the tread surface with respect to an oscillation axis;

at least one support element having an antislip side, accommodatable in an associated accommodation portion provided for on said tread surface, and rotatingly mounted with respect to the articulation structure around a revolution axis different from the oscillation axis, directing the antislip side selectively in an activated state towards the ground or in an inactivated state towards the tread surface;

return means tending to counter the oscillation of the antislip device with respect to the oscillation axis;

wherein the rotation of the support element around the revolution axis controls the rotation of the articulation structure with respect to the oscillation axis, and that the oscillation axis is interposed between the support element and the tip of the sole, when the support element is accommodated in the accommodation portion.

2. A sole according to claim 1 , wherein the antislip device is at least partially made of ferromagnetic material and the return means comprise a magnet applied onto the tread surface and suitable to exert an attraction with respect to the antislip device.

3. A sole according to claim 2 , wherein the support element is at least partially made of ferromagnetic material and the magnet tends to withhold the support element into the accommodation portion.

4. A sole according to claim 1 , wherein the return means include at least one elastic means associated with the articulation structure for exerting thereon a force permanently urging the support element towards the sole or keeping the support element adjacent the sole.

5. A sole according to claim 1 , wherein the support element has at least one countering portion transversely external with respect to the revolution axis and made to push and slide against an abutment portion on the tread surface, causing the oscillation of the articulation structure during the rotation of the support element around the revolution axis.

6. A sole according to claim 5 , wherein said countering portion comprises a projection projecting transversely with respect to the revolution axis and the abutment portion includes a track which allows the sliding of said projection thereon during the rotation of the support element.

7. A sole according to claim 5 , wherein the countering portion is made of ferromagnetic material and the return means comprise a magnet located beneath the abutment portion.

8. A sole according to claim 5 , wherein the support element includes a second countering portion symmetric with respect to the first countering portion with respect to the revolution axis.

9. A sole according to claim 1 , wherein the revolution axis is substantially parallel to the oscillation axis.

10. A sole according to claim 1 , including at least one antislip device located in a front portion of the sole, in a metatarsal zone.

11. Footwear comprising a sole provided with at least one turnable antislip device on the tread surface of said sole operatively facing the sole, the antislip device comprising:

an articulation structure mounted on the tread surface and oscillatable moving away from the tread surface with respect to an oscillation axis;

at least one support element having an antislip side, accommodatable in an associated accommodation portion provided for on said tread surface, and rotatingly mounted with respect to the articulation structure around a revolution axis different from the oscillation axis, directing the antislip side selectively in an activated state towards the ground or in an inactivated state towards the tread surface;

return means tending to counter the oscillation of the antislip device with respect to the oscillation axis;

wherein the rotation of the support element around the revolution axis controls the rotation of the articulation structure with respect to the oscillation axis, and that the oscillation axis is interposed between the support element and the tip of the sole, when the support element is accommodated in the accommodation portion.