Abstract: The present invention relates to a rotatable eccentric element for continuous adjustment of vibration amplitude, for use in, for example, the roll in vibrating rollers. In particular, the invention relates to a rotatable eccentric arrangement adapted for stepless adjustment of vibration amplitude, comprising a rotatable shaft (1) with an eccentric weight (2) arranged in a fixed manner thereon and a movable weight (5) which is pivotable relative to the fixed weight between a position with maximum amplitude and a position with minimum amplitude for changing the vibration amplitude of the arrangement. The invention is characterized in that the pivoting axis for the pivoting of the movable eccentric weight (5) is displaced from the axis of rotation of the shaft (1) and at least to an extent towards the centre of gravity of the fixed weight (2).

Abstract: Steering apparatus for road rollers of the self-propelled type having two drums each of which is journalled to rotate in a frame pivotally mounted on a common chassis. A piston rod, pivotally connected at its ends to the drum frames, is slidably mounted in a steering cylinder pivotally mounted on the chassis. A control system for transmitting and receiving a pressure medium through a pair of lines connected to the steering cylinder responds to a steering device to cause movement of the piston in the cylinder, so that the piston rod causes simultaneous rotation of the drum frames and proper tracking of the road roller drums.