Anti-Skid Device

Anti-skid device with several lengths of chain fixed to a rotary holder, the portions of the lengths of chain facing away from the holder in the operating position being thrown from the rotating holder under centifugal action to the area of the ground-contacting surface of a rotating vehicle wheel, with a pivoting unit for an extension arm bearing the holder and with means for applying opposed pivoting movements to the pivoting unit by which means the extension arm can be moved from a rest position into its operating position and back, wherein the means for applying the pivoting movements to the pivoting unit are formed by a drive unit with a piston guided in a pneumatic cylinder, by which drive unit, with an interposed transmission element formed by a thrust chain comprising a front link and an end link, pivoting movements can be applied to a drive wheel or drive pinion connected to the front link, whose shaft which is held in a housing bears the extension arm for the holder, characterized in that the end link of the thrust chain (22) is directly connected to the piston (16) of the drive unit (6), thus forming a piston rod, and that the housing (12) accommodating the drive wheel or drive pinion (29) and the part of the cylinder (11) facing the housing (12) form a common pressure space to which compressed air can be admitted.