An anti-skid device for use in cooperation with a vehicle wheel for
positioning a traction member beneath the vehicle wheel includes a frame
assembly constructed and arranged to be attached to the vehicle, a swing
arm pivotally connected to the frame, and an electric, linear actuator
having an extendable shaft. The anti-skid device includes a double pivot
link where one end is attached to the frame assembly and the opposite end
is attached to the swing arm. The linear actuator is attached to a
movable pressure plate and a biasing spring is positioned between the
movable pressure plate and a back plate for applying and maintaining
contact pressure of the traction wheel against the vehicle wheel. In the
preferred embodiment, the traction member is a length of chain that is
connected to the traction wheel for positioning between the vehicle wheel
and the road surface.