Land leveler

Claim 1

A LAND LEVELING DEVICE COMPRISING AN ELONGATED, UNITARY, SUBSTANTIALLY HORIZONTAL FRAME HAVING A PAIR OF LONGITUDINALLY EXTENDING CHORDS CONNECTED BY CROSS-BARS, A PLURALITY OF LEVELLING BLADES SECURED TO AND DEPENDING FROM SAID FRAME, WHEEL ASSEMBLIES, MEANS MOUNTING SAID FRAME ON SAID WHEEL ASSEMBLIES FOR VERTICAL MOVEMENT RELATIVE THERETO, MEANS FOR EFFECTING A VERTICAL MOVEMENT OF THE FRAME WHILE SIMULTANEOUSLY MAINTAINING ITS ANGULAR RELATIONSHIP TO THE GROUND, AND MEANS FOR EFFECTING A SIMULTANEOUSLY STEERING OF ALL OF SAID WHEEL ASSEMBLIES AT ANY VERTICALLY ADJUSTED POSITION, EACH OF SAID WHEEL ASSEMBLIES INCLUDING A WHEEL, A VERTICALLY EXTENDING SPINDLE, MEANS MOUNTING SAID WHEEL ON THE LOWER END OF SAID SPINDLE FOR ROTATION ABOUT A HORIZONTAL AXIS, AND A TRANSVERSELY EXTENDING ARM RIGIDLY AFFIXED TO THE SPINDLE, SAID MEANS MOUNTING THE FRAME ON THE WHEEL ASSEMBLIES CONSISTING OF TWO VERTICAL SPINDLE TUBES RIGIDLY FIXED ON OPPOSITE ENDS OF THE FORWARD END OF THE FRAME, AND TWO VERTICAL SPINDLE TUBES RIGIDLY FIXED IN OPPOSITE SIDES OF THE REAR END OF THE FRAME, SAID SPINDLES TUBES AND PROJECTABLE AND ROTATABLE WITHIN SAID SPINDLE TUBES AND PROJECTING THEREABOVE WITH THE TRANSVERSELY EXTENDING ARMS BEING LOCATED ABOVE THE TUBES, SAID MEANS FOR EFFECTING A SIMULTANEOUS STEERING OF THE WHEEL ASSEMBLIES CONSISTING OF A TONGUE HAVING ONE END PIVOTALLY MOUNTED TO THE FORWARD REND OF THE FRAME, FORWARDLY EXTENDING STEERING ARMS RIGIDLY SECURED TO THE FORWARD WHEEL SPINDLES ADJACENT THE LOWER ENDS THEREOF, A DRAG LINK INTERCONNECTING THE TONGUE AND ONE OF SAID STEERING ARMS, A TIE ROD CONNECTING SAID STEERING ARMS AND CROSSED CABLES INTERCONNECTING EACH TRANSVERSELY EXTENDING ARM ON THE FRONT SPINDLES WITH THE TRANSVERSELY EXTENDING ARM ON THE OPPOSITE REAR SPINDLE, SAID REAR SPINDLES HAVING REARWARDLY EXTENDING STEERING ARMS THEREON AND A TIE ROD EXTENDING THEREBETWEEN, LIMIT MEANS OPERATIVELY ASSOCIATED WITH THE WHEEL ASSEMBLIES FOR MAINTAINING THE TRANSVERSELY EXTENDING ARMS ABOVE THE CROSS-BARS IN ALL THE ADJUSTED POSITIONS TO ALLOW FRO A STRAIGHT LINE PROJECTION OF EACH CABLE FROM FRONT TO REAR WITH SAID FRAME BEING OUT OF CONTACT WITH SAID CABLES THROUGHOUT THE RANGE OF VERTICAL ADJUSTMENT OF THE FRAME.