Soil levelling and diking machine

Claim 1

IN A LAND LEVELLING MACHINE HAVING AN ELONGATED TRUSS FRAME, WITH A TRANSVERSE LAND LEVELLING BLADE HORIZONTALLY SUSPENDED THEREUNDER, FOR SWINGING MOVEMENT THEREON; A LINKAGE BETWEEN THE FRONT OF THE FRAME AND A TRACTORSUPPORTING HITCH PLATE; POWER OPERABLE MEANS ON THE LINKAGE TO RAISE AND LOWER THE FRONT END OF THE FRAME ON THE HITCH PLATE; A PAIR OF SPACED CASTER WHEELS SUPPORTING THE REAR OF THE FRAME, AND EACH PROVIDED WITH A CRANK; A TIE BAR PIVOTALLY CONNECTING THE CRANKS OF THE CASTER WHEELS FOR SYNCHRONIZED TURNING OF SAME; A PAIR OF NORMALLY PARALLEL TRIP BARS, EACH PIVOTALLY MOUNTED ON THE FRAME; ONE END OF EACH TRIP BAR SPRING LOADED AGAINST A ROLLER POSITIONED THEREBETWEEN, AND ROTATABLY CARRIED BY THE TIE BAR, SAID SPRING LOADED TRIP BARS NORMALLY AND RESILIENTLY MAINTAINING THE CASTER WHEELS LENGTHWISE ALIGNED WITH THE FRAME, AND PREVENTED FROM DOG TRAILING, WHEN SAID MACHINE IS OPERATING; A PAIR OF ADJUSTING BARS, EACH HAVING ONE END CONNECTED TO ONE END OF THE BLADE; AND THE OTHER ENDS OF SAID LATTER BARS CONNECTED TO THE FRAME, FOR HOLDING THE BLADE IN ADJUSTED POSITIONS ACROSS THE FRAME.