Loader attachment for tractors

Claim 1

IN COMBINATION, A TRACTOR AND A LOADER ATTACHMENT THEREFOR, SAID LOADER ATTACHMENT HAVING A PAIR OF INDEPENDENT BOOM ARMS EACH PIVOTALLY CONNECTED TO OPPOSITE SIDES OF SAID TRACTOR AND EXTENDING FORWARDLY THEREFROM, A BUCKET PIVOTALLY CONNECTED TO THE FORWARD END OF EACH OF SAID BOOM ARMS, A FRAME ON EACH OF SAID BOOM ARMS INTERMEDIATE ITS ENDS, A PAIR OF HYDRAULIC RAMS EACH MOUNTED ON OPPOSITE SIDES OF SAID TRACTOR AND CONNECTED TO SAID FRAMES FOR RAISING AND LOWERING SAID BOOM ARMS, A U-SHAPED LEVER HAVING A PAIR OF LEG MEMBERS AND AN INTERCONNECTING CROSSMEMBER, MEANS PIVOTALLY MOUNTING EACH OF SAID LEG MEMBERS ON RESPECTIVE FRAMES SO THAT SAID U-SHAPED LEVER EXTENDS FROM SAID FRAMES AND ACROSS SAID TRACTOR AND IS PIVOTAL BETWEEN ONE POSITION ABOVE SAID TRACTOR AND ANOTHER POSITION IN FRONT OF SAID TRACTOR, SAID U-SHAPED LEVER BEING OF A SIZE SMALL ENOUGH RELATIVE TO SAID BOOM ARMS SO THAT SAID U-SHAPED LEVER OFFERS SUBSTANTIALLY NO RIGIDITY TO SAID BOOM ARMS, A PAIR OF EXTENSIBLE AND RETRACTABLE MEMBERS EACH ON OPPOSITE SIDES OF SAID TRACTOR EACH PIVOTALLY CONNECTED TO SAID INTERCONNECTING CROSSMEMBER IN AN AREA ON ADJACENT TO RESPECTIVE LEG MEMBERS, A PAIR OF LINK ELEMENTS EACH PIVOTALLY CONNECTED AT ONE END THEREOF TO RESPECTIVE LEG MEMBERS AND AT THE OTHER END THEREOF TO SAID BUCKET, SAID U-SHAPED LEVER BEING OF A SIZE LARGE ENOUGH RELATIVE TO THE AVAILABLE FORCES OF SAID EXTENSIBLE AND RETRACTABLE MEMBERS SO THAT SUBSTANTIALLY NO TWISTING OF SAID USHAPED LEVER WILL OCCUR WHEREBY EACH OF SAID EXTENSIBLE AND RETRACTABLE MEMBERS PIVOT SAID U-SHAPED LEVER EQUALLY IRRESPECTIVE OF ANY UNEQUAL LOADING FORCES ON SAID BUCKET.