Abstract: A synchronized mechanical-hydrostatic gearbox with infinitely variable drive ratio including a hydrostatic gear and a following mechanical gear coupled thereto. The hydrostatic gear includes a hydraulic transmission motor with variable displacement which is connected to the mechanical gear. The mechanical gear is made with at least two gear ratio stages and with means adapted for altering the displacement of the hydraulic transmission motor on alteration of the gear ratio of the mechanical gear to an extent corresponding to the gear ratio change. The gear box is intended to be incorporated in a transmission for vehicles, particularly terrain vehicles, preferably driven by an internal combustion engine.

Abstract: A unit intended for cutting logs includes a body and a chain saw carried by the body, the saw being adapted for displacement in one direction, from an initial position before cutting to an end position after cutting, and in the opposite direction, from said end position to the initial position once again, the unit also having means for carrying out the displacement from said end position after cutting to the initial position once again, such that during the latter displacement no part of the cutting bar will be in the way of the log, for an axial movement of the log initiated immediately after the cutting operation.