Semimounted plow

Claim 1

IN AN AGRICULTURAL IMPLEMENT, A MAIN FRAME BAR EXTENDING OBLIQUELY TO THE DIRECTION IN WHICH THE IMPLEMENT IS ADAPTED TO BE PULLED, A PLURALITY OF DEPENDING EARTH-WORKING TOOLS MOUNTED ON SAID MAIN FRAME BAR, A FORWARDLY EXTENDING HITCH BAR NONROTATABLY ATTACHED TO THE MAIN FRAME BAR, MEANS CARRIED BY SAID HITCH BAR ADAPTED TO BE SECURED TO A TRACTOR, AND MEANS MOUNTING FORWARD AND REAR FURROW WHEELS ON FORWARD AND REAR PORTIONS OF THE MAIN FRAME BAR, RESPECTIVELY, FOR GENERALLY VERTICAL MOVEMENT, A ROCKSHAFT JOURNALED ON THE MAIN FRAME BAR, A ROCK ARM SECURED TO A CENTRAL PORTION OF SAID ROCKSHAFT, A FIRST MEMBER NONROTATABLY SECURED TO ONE END OF SAID ROCKSHAFT, A SECOND MEMBER JOURNALED ABOUT THE OTHER END OF SAID ROCKSHAFT, FIRST AND SECOND EXTENSIBLE AND RETRACTABLE MEANS, EACH HAVING ONE OF THEIR ENDS SECURED TO THE FIRST AND SECOND MEMBERS RESPECTIVELY, THE OTHER ENDS OF SAID EXTENSIBLE AND RETRACTABLE MEANS BEING SECURED TO THE MAIN FRAME BAR, AND MEANS INTERCONNECTING SAID ROCK ARM AND SAID SECOND MEMBER WITH SAID REAR AND FORWARD FURROW WHEEL MOUNTING MEANS RESPECTIVELY, WHEREBY MOVEMENT OF EITHER SAID SECOND MEMBER OR SAID ROCK ARM WILL CAUSE THE ASSOCIATED FURROW WHEEL TO BE MOVED VERTICALLY.