An anti-wheel spin device for rubber tired vehicles including a pair of mattings or pads of different lengths coupled together to prevent them from propelling against the vehicle by a spinning wheel. A winching accessory is also provided for securing one of the mattings or pads to a wheel to be extricated when the force required to move the vehicle exceeds the tractive force developed between the matting or pad and the wheel.

A laminated glass-plastic glazing unit suitable for aircraft is disclosed. The unit comprises a pair of sheets of rigid transparent material such as glass and an interlayer of thermoplastic material that is susceptible to crack at low temperatures and that has a higher coefficient of thermal expansion than the sheets of rigid transparent material. Electrical resistance material preferably in the form of thin metal wire, is embedded within the interlayer and disposed locally in areas along a pair of opposite marginal edges of the interlayer and electrically energized to heat the interlayer portion adjacent thereto sufficiently to overcome the tendency of the interlayer to pull chips from the marginal portion of one or both of the rigid sheets when the unit is subjected to extremely low temperature conditions in a high-flying aircraft. The electroconductive material is embedded within the interlayer in spaced relation to a transparent electroconductive coating on one of the glass sheets for heating the glazing unit to dissipate mist or frost and is located relative to the thickness of the interlayer in a plane that is closer to the rigid sheet more likely to become damaged when the unit is exposed to the aforesaid low temperature conditions. The interlayer may also include a metal reinforcement frame in heat exchanging relation to the electroconductive material that extends to the edge of the interlayer to conduct heat received from the electroconductive material to the edge of the interlayer, thereby retarding the cooling of the edge of the interlayer to a temperature at which it cracks.

A trackhoe anti-skid device for reducing lawn damage having a bottom traction plate a spike connected to the bottom traction plate for frictionally engaging conventional earth. A top traction plate boltable to the bottom traction plate for adjusting the width.

A mat for providing traction between a vehicle wheel and a slippery road surface including a planar shaped rubber member providing with integrally molded downwardly extending cleats for engaging the road surface and an upper layer of carpet for frictional engagement by the vehicle wheel. The mat layer includes a retractable handle disposed within a recess formed in the member, the handle extending in a direction transverse to the direction of wheel travel for assisting the user in positioning the mat.

A studded traction assist strip for providing emergency traction in the event of snow or ice conditions resulting in a stuck vehicle. The strip includes a generally flat and thin elongate body formed from a resilient rubber material. The body further includes a road facing surface and a wheel traction surface. The road facing surface including a plurality of metal studs extending therefrom for gripping icy surfaces, and the body further includes a plurality of transverse grooves for gripping when said body is in an extended position and to facilitate forming a compact roll for storage when the traction strip is not in use.