Land leveler

Claim 1

A LAND LEVELER COMPRISING, IN COMBINATION WITH A TRACTOR, A SCRAPER BLADE, MEANS FOR PIVOTALLY SECURING SAID BLADE TO THE REAR OF SAID TRACTOR, HYDRAULIC MEANS FOR RAISING AND LOWERING SAID BLADE, A FRAME MEMBER SECURED TO SAID BLADE, A REAR FEELER ELEMENT INCLUDING A TRACER WHEEL PIVOTALLY SECURED TO SAID FRAME, A FIRST CONTROL ARM PIVOTED TO SAID FRAME MEMBER AND EXTENDING UPWARDLY AND REARWARDLY THEREFROM, FLEXIBLE MEANS SECURING THE TOP OF SAID FIRST CONTROL ARM TO THE REAR OF SAID FEELER ELEMENT, A SECOND CONTROL ARM PIVOTED TO SAID FRAME MEMBER INDEPENDENTLY OF SAID FIRST CONTROL ARM AND EXTENDING UPWARDLY AND FORWARDLY THEREFROM, A FRONT FEELER ELEMENT, A FLEXIBLE CONNECTION BETWEEN SAID SECOND CONTROL ARM AND THE FRONT FEELER ELEMENT, A SPRING CONNECTING THE TOP OF SAID FIRST AND SECOND CONTROL ARMS, VALVE CONTROL MEANS EXTENDING BETWEEN SAID FIRST AND SECOND CONTROL ARMS AND ACTUATED BY THE RELATIVE POSITION OF SAID ARMS TO EACH OTHER TO CONTROL SAID HYDRAULIC MEANS TO RAISE AND LOWER SAID SCRAPER BLADE IN ACCORDANCE WITH THE RAISING AND LOWERING OF SAID FRONT AND REAR TRACER WHEELS, SAID VALVE CONTROL MEANS INCLUDING A SLEEVE PIVOTALLY SECURED TO ONE OF SAID CONTROL ARMS, A ROD TELESCOPING INTO SAID SLEEVE PIVOTALLY SECURED TO THE OTHER OF SAID CONTROL ARMS, A HYDRAULIC CONTROL VALVE MOUNTED ON SAID SLEEVE, A PISTON IN SAID VALVE, A CAM FOLLOWER ON SAID PISTON, AND A CAM SURFACE ON SAID ROD ENGAGED BY SAID CAM FOLLOWER.