Abstract: Cultivating tines, each having opposite cutting edge portions, are pivotably supported by mount brackets on a tine shaft reversibly rotatable about a horizontal lateral axis. One of the edge portions of each tine is positionable in a position rearward with respect to the direction of forward rotation, while the other edge portion is positionable in a position rearward with respect to the direction of reverse rotation. The edge portions differ in upstanding posture when positioned for rotation in the intended direction. The curved edge line of the reverse-rotation edge portion is more upstanding than that of the forward-rotation edge portion when coming into contact with the ground.

Abstract: In a wrapping connector driving apparatus for agricultural machines including a chain reeved around sprocket wheels on two shafts, a tension adjusting device is provided on the slack side of the chain. A tightener bearing against the chain tensions the chain. A piston slidably fitting in an oil enclosing cylinder is pressed against the tightener by a resilient member. An abnormal load, when acting on the chain, is absorbed by the resilient member and the oil enclosed in the cylinder, which is provided with a passageway for releasing the increased internal pressure due to the abnormal load. When relieved of the load, the cylinder can be supplied with oil by way of a check valve. The tension on the chain is thus automatically adjustable.