Abstract: A cultivating tool for a soil cultivating machine includes a holder adapted to be mounted on a rotatable shaft and having a generally U-shaped channel receiving a working implement. A pin is disposed in the channel, and the implement has a hook which receives the pin. Cooperable retainers in the channel and on the implement are cooperable for retaining the implement in the channel, the implement being mountable on the holder by hooking the hook on the pin and effecting engagement between the retainers, the implement being demountable from the holder by disengaging the retainers from the implement and unhooking the hook from the pin.

Abstract: A powered spinning tiller with a box beam extending transversely of the direction of travel includes a plurality of spinners each consisting of a prong holder and a drive gear disposed rotatably on bearings side by side, adjacent prong holders being driven to rotate in opposite directions by the gear drive. In order to create an economical method of constructing a spinning tiller by the simplest means, provision is made for each spinner to be journaled on only one bearing and/or bearing ring which is situated in a single plane.

Abstract: The soil working machine, especially a circular spike harrow, includes a support housing (2) which extends perpendicular to the running direction (1), several soil working tools (3) disposed next to one another at the support housing (2), tool supports (4) asociated with each of the soil working tools (3), a driveshaft (6) connected to the tool support (4) and rotatably mounted in the support housing (2), and a rotational drive for the tool supports (4). The rotational drive has a gear wheel transmission (10) disposed in the support housing (2), the gear wheel transmission (10) having one gear wheel (11) for each tool support (4), the gear wheel (11) being rotatably mounted on a hub body (12) which is affixed on the drivehsaft (6) in a non-rotating fashion. The gear wheel (11) is coupled to the hub body (12) by a catching device (14, 25) which is under a spring pretension and which can be temporarily released in case of overload.