The rear end of the oblique frame of a multi-share plough is supported by a land wheel 48 and a rear furrow wheel 36 on leading and trailing pivoted arms 40 and 30 respectively. The wheels are lowered and raised together, to raise and lower the frame respectively, by a double-acting hydraulic cylinder 66 which rocks an arm 62 clockwise to raise the wheels. The arm 62 then pushes an arm 58 clockwise, the arm 58 being integral with the land wheel arm 40, and pulls the arm 30 anticlockwise by a link 78. When the cylinder rocks the arm 62 anticlockwise the wheel 48 rises faster than the wheel 36 (because of different lever arm ratios) until the arm 40 hits a stop 92, this being the illustrated position. This tilts the beam carrying the arms 30 and 40 and rolls the frame in the sense tilting the share points 22 into the ground. Lost motion between the arms 62 and 58 allows the wheel 36 to finish rising so digging the shares into working depth while levelling off the tilt which has helped them to dig in efficiently. IMAGE
展开▼
