Front-mounted mower with cutting knives moving to and fro

摘要

In front-mounted mowers of tractors and the like, when excessive forces, such as are caused by blockages or by encountering boundary stones or the like, occur the cutting units (61) move back by pivoting, in order to prevent damage to them and accidents. So that the pivotably connected swath boards (49), reaching to just in front of the wheels (58) of the two-wheel tractor (1) during operation, do not butt against the front wheels (58) when the cutting unit (61) pivots back, and so that the cutting unit (61) moves away from the obstructions in the earth more quickly than corresponds to forward travel, shortly after the backward pivoting has commenced these parts are pivoted upwards or backwards and upwards at a higher speed by means of hydraulic actuators (16, 51). <IMAGE>