Patent ID: 7766387

Claim:
An anti-skid device for use in cooperation with a vehicle wheel for positioning a traction member beneath the vehicle wheel, said anti-skid device comprising: a support member constructed and arranged to be attached to a vehicle; a swing arm including a traction wheel with at least one traction member secured to said traction wheel; a drive assembly attached to said support member and to said swing arm and being constructed and arranged to extend and retract said swing arm, wherein extending said swing arm places said traction wheel in contact against an inner surface of said vehicle wheel; and said drive assembly including a worm gear, a worm constructed and arranged to mesh with said worm gear, a drive motor, first means for coupling said swing arm to said worm gear, second means for coupling said drive motor to said worm and a biasing spring, wherein operation of said drive motor moves said swing arm via said worm and worm gear combination, wherein said drive assembly further includes a first limit switch constructed and arranged to stop the operation of said drive motor and wherein said biasing spring cooperates in maintaining the contact of said traction wheel against said inner surface.