Tractor attachment with parallelogram type lift

Claim 1

IN COMBINATION WITH A TRACTOR HAVING A FRONT AXLE WITH STEERABLE WHEELS THEREON; A FRAME REMOVABLY SECURED TO SAID TRACTOR AND HAVING A PAIR OF SIDE MEMBERS EXTENDING FORWARDLY UNDER SAID FRONT AXLE SPACED INWARDLY OF SAID WHEELS; A VERTICAL SUPPORT PLATE SECURED TO THE FRONT END OF EACH SIDE MEMBER AND EACH PLATE BEING A DISTANCE REARWARDLY OF THE FRONT EDGES OF SAID FRONT WHEELS GREATER THAN THEIR DISTANCE FORWARDLY FROM SAID FRONT AXLE; HORIZONTAL UPPER AND LOWER REAR SHAFTS JOURNALLED IN SAID PLATES; UPPER AND LOWER FORWARDLY EXTENDING LINKS SECURED TO SAID SHAFTS SPACED A SUBSTANTIAL DISTANCE INWARDLY OF SAID PLATES AND SIDE MEMBERS WHEREBY TO PROVIDE CLEARANCE OF STEERING MOVEMENT OF SAID FRONT WHEELS; AND AN IMPLEMENT PIVOTALLY MOUNTED ON THE FORWARD ENDS OF SAID LINKS, AN UPRIGHT FRAMEWORK PIVOTALLY CONNECTED TO THE FORWARD ENDS OF SAID LINKS; MEANS CONNECTING ONE PORTION OF SAID IMPLEMENT TO ONE LATERAL END OF SAID FRAMEWORK FOR PIVOTAL ADJUSTMENT ABOUT A HORIZONTAL AXIS EXTENDING GENERALLY FORE-AND-AFT OF SAID IMPLEMENT; AND MEANS CONNECTING ANOTHER PORTION OF SAID IMPLEMENT TO THE THERE END OF SAID FRAMEWORK FOR VERTICAL ADJUSTMENT THEREON WHEREBY ONE END OF SAID IMPLEMENT MAY BE RAISED OR LOWERED, SAID LASTNAMED MEANS COMPRISING AN UPPER AND A LOWER ARM EACH PIVOTED TO SAID FRAMEWORK AT SAID OTHER END THEREOF AND EXTENDING FORWARDLY THEREFROM INTO PIVOTAL ENGAGEMENT WITH SAID OTHER PORTION OF SAID IMPLEMENT; AND ADJUSTING MEANS FOR PIVOTALLY ADJUSTING SAID ARMS IN A VERTICAL PLANE AND LOSKING THEM IN A SELECTED POSITION OF ADJUSTMENT.