Clamp type traction devices

Claim 1

IN COMBINATION, A TIRE RIM, A PNEUMATIC TIRE SEATED IN THE RIM, SAID TIRE HAVING CONVEX SIDEWALLS AND A TREAD, SAID SIDEWALLS HAVING CONTACT AREAS ADJACENT TO THE RIM SAID LOCATED BETWEEN THE BULGES OF THE SIDEWALLS AND THE RIM, A TRACTION DEVICE COMPRISING A FRAME HAVING A CROSSMEMBER ENGAGED WITH THE TIRE TREAD, AND GRIPPING ARMS ON THE CROSS-MEMBER HAVING TIPS AT THEIR FREE ENDS FORCIBLY-ENGAGED WITH SAID CONTACT AREAS, THE REMAINDERS OF THE GRIPPING ARMS BEING LATERALLY-SPACED FROM THE TIRE SIDEWALLS, SAID GRIPPING ARMS BEING DISPOSED AT RIGHT ANGLES TO THE CROSS MEMBER AND HAVING LATERALLY INWARDLY EXTENDING TIPS AT THEIR FREE ENDS, SAID TIPS BEING ADJUSTABLE RELATIVE TO THE GRIPPING ARMS, SAID ARMS BEING FORMED WITH TRANSVERSE BORES, SAID TIPS COMPRISING RATCHET PLATES SLIDING THROUGH THE BORE, AND SPRING RATCHET DOGS PIVOTED ON THE INWARD SIDES OF THE ARMS, SAID RATCHET DOGS HAVING UPPER ENDS NORMALLY ENGAGED WITH THE TEETH OF THE RATCHET PLATES.