Detachable tire anti-skid device

In a detachable anti-skid device for fitting to the tire of a wheel of a vehicle and of the kind comprising a support bearing a series of anti-skid components extending transversely over the tread of the tire and at least one pneumatic control jack provided with means for feeding air to said jack from the air valve of the tire for applying the anti-skid components against the tread of the tire, the improvement wherein said support is in the form of a ring the diameter of which is slightly less than that of the tire, means for pivotally mounting one end of said anti-skid components on said ring for pivoting about a pivot axis tangential to said ring, a hub for the ring held in position by a series of spokes extending between said hub and said ring, said hub comprising a compressed-air distribution chamber, an inlet orifice to said chamber, a rotary connection and on said hub a flexible hose coupled to said rotary connection for coupling to the inlet valve of the tire, and outlet orifices from said chamber connected to the pneumatic control jacks of the anti-skid components with said pneumatic control jacks disposed radially between the said hub and the anti-skid components and operatively coupled at opposite ends to said anti-skid components and said hub, respectively.