| 摘要 |
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. The reversing spindle is adapted to be tilted in a vertical plane simultaneously with the reversing spindle being rotated so that the center of gravity of the plough frame can be maintained substantially in a horizontal plane as the plough bodies are being moved to and from their right and left handed plowing positions. The mechanism for rotating the spindle about its longitudinal axis includes a pinion on the reversing spindle and a moveable rack cooperable with the pinion, with the rack being connected between opposed hydraulic pistons. |
