Stringline attachment for paving machine

Claim 1

IN A PAVING MACHINE OF THE TYPE HAVING A MAIN BODY, MOBILE ON A ROADWAY, A SCREED CARRIED IN TOWED RELATION ON A PAIR OF ROCKER ARMS PIVOTED ON SAID BODY, MEANS ADJUSTABLY CONNECTING SAID SCREED AND SAID ARMS TO VARY THE ATTITUDE OF SAID SCREED WITH RESPECT TO SAID ROCKER ARMS, AND SENSING MEANS OPERATIVELY ASSOCIATED WITH SAID SCREED, THE IMPROVEMENT COMPRISING AN ELONGATED WALKING BEAM MEDIALLY PIVOTED TO AND EXTENDING WELL IN ADVANCE OF AND TO THE REAR OF SAID BODY, ON A SHAFT EXTENDING LATERALLY FROM ONE SIDE THEREOF, A GROUND-ENGAGING WHEEL CARRIED AT EACH OF THE OUTER ENDS OF SAID WALKING BEAM, ANCHOR MEANS FOR A STRINGLINE CARRIED BY SAID WALKING BEAM NEAR EACH END THEREOF, AND A STRINGLINE ATTACHED AT ITS ENDS TO SAID ANCHOR MEANS SAID SENSING MEANS BEING IN CONTACT WITH A POINT MIDWAY OF SAID STRINGLINE.