Land leveler

Claim 1

IN AN EARTH SCRAPING MACHINE HAVING AN ELONGATED MAIN FRAME, A TRANSVERSE BLADE MOUNTED THEREON, AND A WHEEL-CARRYING REAR FRAME CONNECTED BY VERTICAL PIVOT MEANS TO THE MAIN FRAME TO ACCOMMODATE LATERAL SWINGING OF THE REAR FRAME TO FACILITATE TURNING THE MACHINE, THE COMBINATION OF MEANS FOR OFFSETTING THE UNBALANCING OF THE BLADE-CARRYING MAIN FRAME BY THE LATERAL SWINGING OF THE REAR FRAME INCLUDING A TRANSVERSE ROCK SHAFT MOUNTED ON THE MAIN FRAME HAVING WHEEL-CARRYING CRANK ARMS MOUNTED THEREON FOR SWINGING IN A VERTICAL PLANE UPON ROCKING THE SHAFT, AND MEANS OPERATIVELY CONNECTING SAID REAR FRAME TO SAID ROCK SHAFT TO ROCK IT IN A DIRECTION TO APPLY DOWN PRESSURE TO SAID WHEELS IN RESPONSE TO LATERAL SWINGING OF THE REAR FRAME, COMPRISING A LEVER PIVOTALLY MOUNTED ON THE MAIN FRAME FOR SWINGING IN A VERTICAL PLANE, ACTUATING MEANS CARRIED BY SAID REAR FRAME ENGAGEABLE WITH SAID LEVER TO SWING THE LATTER IN ONE DIRECTION UPON LATERAL SWINGING OF THE REAR FRAME, AND INEXTENSIBLE LINKAGE OPERATIVELY CONNECTING SAID LEVER TO SAID ROCK SHAFT TO ROCK THE LATTER IN A DIRECTION TO EXERT DOWN PRESSURE ON SAID WHEEL-CARRYING CRANK ARMS.