Abstract: A tire traction device having a plurality of radial tensioning arms extending radially from a central hub, a fraction pad coupled to each of the radial tensioning arms at an end opposite the central hub and the radial tensioning arms including rigid bodies movable in a radial direction relative to the central hub along radii spaced about the central hub at fixed angular positions to provide tensioning of the traction pads against a tire. A rotatable tensioner may be disposed within the central hub, the rotatable tensioner including curved guide vanes to which the tensioning arms are coupled. Each of the tensioning arms includes a pin configured to be seated into, and slide within, the curved channel so as to remain in a substantially constant angular position relative to the outer circumference of the central hub while being displaced radially in response to a rotation of the rotatable tensioner.

Abstract: A tire traction device having a plurality of radial tensioning arms extending radially from a central hub, a fraction pad coupled to each of the radial tensioning arms at an end opposite the central hub and the radial tensioning arms including rigid bodies movable in a radial direction relative to the central hub along radii spaced about the central hub at fixed angular positions to provide tensioning of the traction pads against a tire. A rotatable tensioner may be disposed within the central hub, the rotatable tensioner including curved guide vanes to which the tensioning arms are coupled. Each of the tensioning arms includes a pin configured to be seated into, and slide within, the curved channel so as to remain in a substantially constant angular position relative to the outer circumference of the central hub while being displaced radially in response to a rotation of the rotatable tensioner.