Abstract: A reversible plough has a headstock formed from upper and lower parts hingedly connected about a transverse axis, the reversing spindle being mounted in the lower headstock part and carrying a crank arm connected by a link to the upper headstock part. As the reversing spindle is rotated, relative hinging movement between the two headstock parts causes the reversing spindle to tilt in a vertical plane, the load in said link counterbalancing to a degree the offset center of gravity of the plough frame and reducing the torque required to reverse the plough frame. The plough frame carries left handed and right handed plough bodies and the center of gravity of the plow frame is laterally offset from the longitudinal axis of the reversing spindle.

Abstract: A reversible plough has a double acting hydraulic ram connected between the headstock and the reversing spindle to reverse the plough frame from a left handed to a right handed ploughing position, and vice versa. Hydraulically operating mechanism is provided in the headstock both to switch the flow of hydraulic fluid from one to the other end of the double acting ram and to apply additional reversing torque to the spindle at the midway position. The mechanism comprises two hydraulic cylinders acting upon a fork pivotally mounted in the headstock and engaging with a roller spaced radially of the spindle. As the midway position is approached, the roller displaces the fork from a rest position whereupon the fork is rotated by the cylinders to drive the reversing spindle through the midway position. Internal fluid pathways in the two cylinders effect the change of fluid flow to the double acting ram.

Abstract: A reversible plough has a headstock, a plough frame and a reversing spindle secured to the frame and rotatable in the headstock. A stop member rotatable about the reversing spindle is provided with two adjustable stops to enable the two ploughing positions of the plough frame to be preset relative to the headstock. To reverse the plough frame from one ploughing position to the other, the spindle and thus the plough frame is rotated by a hydraulic ram and an abutment on the spindle engages the stop member to cause said member to rotate with the spindle until the corresponding stop engages the headstock to locate the spindle and hence the plough frame in the other ploughing position.