Abstract: A tiller for cultivating soil has a power source and a tilling shaft mounted for undergoing rotation by a driving force supplied from the power source. The tilling shaft has a hollow outer shaft and an inner shaft extending through the outer shaft. The inner shaft has a variable rotating speed and/or direction of rotation relative to the outer shaft. A power transmission mechanism transmits a driving force from the power source to the tilling shaft. The power transmission mechanism has a first power transmission system for transmitting the driving force from the power source to the outer shaft and a second power transmission system transmitting the driving force from the power source to the inner shaft. The second power transmission system has a hydrostatic transmission comprised of a hydraulic pump and a hydraulic motor for effecting a stepless change of the rotating speed of the inner shaft as well as a selective change of its direction of rotation.

Abstract: A rotary plough has a rotor that rotates about a horizontal axis defined by a central support. The rotor comprises three spaced apart groups of soil working tines and each group includes a row of tines mounted on arms that extend radially with respect to the support. Each row of tines is independently connected via a chain transmission to a toothed pinion on the central support so that as the entire rotor turns about the support, each row of tines is also revolved about a horizontal axis. The central support is rotated by a further sprocket and chain transmission connected to a gear box with a P.T.O connection. The central support is surrounded by a second rotatable support on which radial scrapers are mounted. The gear box is connected to rotate the entire rotor as a whole and the three groups of tines in the same direction so that the tines are moved through the soil rearwardly with respect to the normal direction of travel.

Abstract: Disclosed is a tilling apparatus characterized by a regulating drive connection between the towing tractor drive axle and the tiller shaft, the tiller tines having a modified arcuate configuration which provide a pocketed, rather than a furrowed or channeled, tilling depth profile.