Semimounited one-way plow

Claim 1

IN COMBINATION: (A) A TRACTOR HAVING A POWER LIFT AND A HORIZONTALLY SWINGABLE DRAWBAR; (B) AN IMPLEMENT HAVING A FRAME EXTENDING REARWARDLY FROM THE TRACTOR AND OBLIQUELY TO THE NORMAL PATH OF TRAVEL OF THE TRACTOR AND IMPLEMENT; (C) A HITCH; (D) A COUPLING BETWEEN THE HITCH AND THE LIFT AND SPACED FROM SAID DRAWBAR; (E) A HINGE CONNECTION BETWEEN THE HITCH AND ONE END OF THE FRAME, DISPOSED FOR SUPPORTING SAID ONE END ABOVE THE GROUND AND FOR PERMITTING SWINGING MOVEMENT OF THE FRAME ABOUT AN UPRIGHT AXIS AS THE CONNECTION SUPPORTS SAID END; (F) A TOWLINE; (G) A JOINDER BETWEEN ONE END OF THE TOWLINE AND THE DRAWBAR; (H) A FASTENER BETWEEN THE OPPOSITE END OF THE TOWLINE AND THE FRAME INTERMEDIATE THE ENDS OF THE LATTER WHEREBY THE TRACTOR PULLS THE IMPLEMENT DURING ADVANCEMENT OF THE TRACTOR, SAID FASTENER BEING DISPOSED ON THE FRAME TO NORMALLY PLACE THE DRAWBAR AND THE TOWLINE ON A LINE OF DRAFT THAT IS IN ANGULAR RELATIONSHIP TO SAID PATH OF TRAVEL; AND (I) A YIELDABLE DEVICE INTERPOSED IN SAID TOWLINE, PERMITTING LIMITED SWINGING MOVEMENT OF THE FRAME IN ONE DIRECTION ABOUT SAID AXIS.