Jack knife tongue

Claim 1

APPARATUS FOR RAISING AND LOWERING AN EARTH-WORKING IMPLEMENT COMPRISING A FRAME HAVING A FIXED TONGUE, A SEGMENTAL TONGUE PIVOTALLY CONNECTED TO SAID FIXED TONGUE ADJACENT ONE END THEREOF, MEANS CONNECTING THE OPPOSITE END OF SAID SEGMENTAL TONGUE TO A PROPELLING VEHICLE, AN UPSTANDING LUG MOUNTED ON EACH OF SAID FIXED AND SEGMENTAL TONGUES, ADJUSTABLE FLUID OPERATED MEANS CONNECTING THE FREE ENDS OF SAID LUGS, ARMS EACH CONNECTED AT ONE END TO ONE OF SAID LUGS, A LEVER PIVOTALLY CONNECTED AT ONE END TO THE OPPOSITE ENDS OF EACH OF SAID ARMS, MEANS FOR PIVOTALLY MOUNTING EACH OF SAID LEVERS INTERMEDIATE ITS ENDS ON SAID FRAME, A LINK PIVOTALLY CONNECTED TO THE OPPOSITE END OF EACH OF SAID LEVERS, A PLURALITY OF WHEELSUPPORTING MEMBERS INDEPENDENTLY PIVOTALLY MOUNTED ON SAID FRAME, MEANS PIVOTALLY CONNECTING EACH LINK WITH ONE OF SAID WHEEL-SUPPORTING MEMBERS, WHEELS ROTATABLY MOUNTED ON SAID WHEEL-SUPPORTING MEMBERS, AND AN EARTHWORKING IMPLEMENT MOUNTED ON SAID FRAME, WHEREBY ACTUATION OF SAID FLUID MEANS IN ONE DIRECTTION WILL RAISE SAID FRAME AND MOVE SAID EARTH-WORKING IMPLEMENT FROM ENGAGEMENT WITH THE EARTH AND ACTUATION IN THE OPPOSITE DIRECTION WILL LOWER THE FRAME AND MOVE SAID IMPLEMENT INTO ENGAGEMENT WITH THE EARTH.