Patent ID: 7971886

Claim:
An implement apparatus adapted to be towed along the ground, the apparatus comprising: a caster wheel pivotally attached to an implement about a substantially vertical caster axis, and operative to support the implement for movement along the ground with the caster wheel behind the vertical caster axis when the implement is moving in a forward direction; a steering link engaged with the caster wheel, and an actuator operative to move the steering link from a neutral position to a controlling position; wherein when the steering link is in the neutral position, the caster wheel can pivot about the caster axis through 360 degrees; wherein when the steering link is moved to the controlling position, the caster wheel is pulled toward a position oriented to roll toward a first side of the implement when the implement is moving in the forward direction; wherein the caster wheel is mounted on a substantially vertically oriented pivot shaft that is pivotally mounted to the implement, the apparatus further comprising a drag arm connected to the pivot shaft such that moving the drag arm laterally causes the caster wheel to pivot about the caster axis, wherein the steering link is engaged with the drag arm; wherein the drag arm is engaged in a slot in the steering link, and wherein the drag arm is engaged at a middle portion of the slot when the steering link is in the neutral position, and wherein the drag arm is engaged at an end of the slot when the steering link is moved to the controlling position.