Abstract: A mechanism for cutting of stalks or stems of plants and/or grass-like vegetation, in an environmentally safe manner, has counter-blades arranged on a circular path and rotary blades positioned above the counter-blades. The ratio of the surface area of the counter-blades actually taking part in the cutting and the surface area of the free spaces between them, in relation to each other, is smaller than a value of one. A distance of "h" between the counter-blades and the rotary blades is a value between 0-2 mm, and the peripheral speed of the rotary blades is between 10 and 50 m/sec.

Abstract: The invention relates to an optoelectromechanical apparatus for measuring physical parameters, as pressure or force, comprising an emitting optical fibre coupled via its input with a light source, receiving optical fibre connected over its output to signal processing means and a carrier including a resilient member for bearing the emitting and the receiving optical fibres, wherein the input of the receiving optical fibre is in optical coupling with the output of the emitting optical fibre, advantageously through a spacing and the processing means comprise a first and a second photodiodes for detecting light of the light source and the light output of the receiving optical fibre.

Abstract: A radial bearing for two parallel shafts whose direction of radial load is inclined 60.degree. to 75.degree. to the outside toward a line intersecting the two shaft axes comprising a pair of races with a spherical outer contour adjustably mounted in a common bearing housing, the said races being flattened at their facing points with a gap between the races whereby the axes of the races are so close together that their distance is less than the diameter of a race, the recess of the housing receiving the races having an inside width of at least the axial length of the races, one of said races being provided at the side opposite the flattened portion with two plane or slightly curved surfaces inclined to each other in the manner of a roof and running from the end faces of the race and protruding into the area of its crowned surface and the said housing being a unitary element provided in the area of one recess at one end face with an inlet groove corresponding to the cross-sectional profile of said race.