Abstract: The invention is directed to a fail-safe brake arrangement for hydraulically powered road rollers. The operating means of the brake system are completely separate from the normal road brake of the roller thereby enabling the fail-safe brake to be manually operated by the driver in an emergency situation. The brake also operates automatically as soon as the hydraulic system of the roller ceases to function. The fail-safe brake according to the invention utilizes the oil pressure to compress one or more springs in a spring brake chamber. As soon as the oil pressure falls to zero or below a certain value, the energy stored in the springs is utilized to apply the brake and bring the vehicle to a halt.

Abstract: A vibratory apparatus in which the amplitude of vibration is continuously adjustable, includes a tubular rotatable shaft journalled in the member to be vibrated, and at least one elongated and flexible eccentric mass element disposed in the tubular shaft. The eccentric mass element is guided along guide surfaces, arranged so that part of the eccentric mass element is urged by centrifugal force away from the axis of the tubular shaft when the shaft is rotating. An adjustment means is coupled to the eccentric element to control the position of the element along the slide surfaces, to thereby vary the vibration amplitude of the vibrating tubular shaft.