Abstract: An adjusting device (11) is for regulating the eccentric moment of an eccentric shaft (2) of a roller drum (1) through the influence of an axially directed force transmitted by a force transmission mechanism (12) to a turning device (5), in order to cause a rotation of the eccentric shaft (2). The force transmission mechanism (12) is connected to the adjusting device (11). The adjusting device (11) incorporates a driving device (20), a transmission (19), a tube sleeve (17) and a guide screw (14) which is rotatably arranged in a threaded bore (16) in a journalling shaft (15) for the roller drum (1). The driving device (20) is connected to the tube sleeve (17) via a transmission (19) for transmitting a rotary movement to the tube sleeve (17).

Abstract: A secondary braking device for a self-propelled diesel-driven roller (1) is especially for a vibrating roller that is operated on steep downgrades only on rare occasion. The roller (1) is equipped with an electronic engine control module (2) that is programmed so as to, when a preset primary diesel engine speed is exceeded, connect to ground an actuator relay (4) for a hydraulic valve (5) in the hydraulic system (6) of the roller. The hydraulic valve is thereby caused to interrupt the hydraulic supply pressure to one or a plurality of drum brakes (8). The drum brakes (8) generate maximum braking force upon the loss of supply pressure.

Abstract: The invention relates to an arrangement and method for operating a self-propelled vibratory plate device. The vibratory plate of this device receives its vibratory motion from counter-rotating eccentric parts driven by an internal combustion engine. According to the method, the vibratory plate is stopped with a deadman's handle mounted on the device without the engine stopping. The method is realized with the arrangement of the invention which includes the deadman's handle. The deadman's handle is connected to the engine's fuel control and a centrifugal clutch between the engine and the eccentric parts is engaged only when the speed of the engine is above idle speed. A cam is provided with an interacting support which limits the angular movement of the deadman's handle to a position which corresponds to the idle speed of the engine.

Abstract: A hand-operated forward-reverse vibrating plate compactor which includes a vibrating assembly having two counter-rotating eccentrics. The vibrational force generated by the eccentrics is directional and the forward and reverse motion of the vibrating plate compactor is achieved by changing the phase position of the eccentrics relative to each other. This change in the phase position is accomplished smoothly by means of a hydraulic servo control system which permits a continuously variable adjustment of the speed and intensity of the vibration of the vibrating plate compactor to be made.

Abstract: A poker vibrator includes an extra weight which is mounted on the hose accommodating the power supply of the vibrator of the poker vibrator assembly connected to the end of the hose. The extra weight is mounted on the hose in the vicinity of the casing. the extra weight is also in the area of the hose where it is manually held by the operator when using the poker vibrator. The poker vibrator equipped with the extra weight prevents or at least damps the vibration amplitude and with it the intensity of the vibration in the area of the hose manually held by the operator.

Abstract: A self-propelled grinding or milling apparatus for finishing a surface of concrete or similar hard material such as a floor, which includes a frame supported on a number of wheels. A rotating grinding or milling tool is mounted in the frame and has a vertical shaft which is suspended and loaded with weights so that the pressure of the wheels on the surface is maintained at a constant level at varying working pressures of the tool. The apparatus is arranged to tilt laterally by means of a raising and lowering device which acts on the non-steerable wheels so that the pressure of the tool on the floor differs on the right-hand and left-hand side of the apparatus and so gives rise to frictional forces which cause the apparatus to move either in the forward direction or the rearward direction at a speed which is dependent on the magnitude of the tilt.

Abstract: The invention is directed to an apparatus for resetting the vibration amplitude of a hydraulically driven vibration device having two eccentric weights arranged on a rotating shaft and rotatable relative to each other. The amplitude-resetting arrangement includes a hydraulic directional valve for resetting the vibration device between high and low amplitudes. The valve is electrically operated and the electric control circuit incorporates a time-delay relay for delaying the amplitude change until the speed of the rotating shaft has been reduced to an acceptable level.

Abstract: The invention is directed to a rotary tool for attachment to a machine for working and smoothing an even surface of a base made of cement, concrete or similar hard material. The machine includes a multi-wheeled vehicle and at least one tool drive shaft arranged on the vehicle. The tool drive shaft defines a longitudinal axis extending perpendicularly to the base to be worked and has a tool holder for holding the rotary tool. The rotary tool includes a plate on which a plurality of cutter-wheel units are mounted about the periphery thereof. Each of the cutter-wheel units includes a frame attached to the plate and axles mounted so as to define respective rotational axes parallel to the plate and substantially parallel to a radius passing through the longitudinal axis of the tool drive shaft. A plurality of cutter wheels is mounted on the axles so as to rotate freely with respect thereto.

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: The invention is directed to a measuring apparatus for determining the degree of compaction of material for building dams, roads or the like after the material has been compacted with a suitable compaction machine. The measuring apparatus includes a vibrating drum which is equipped with a transducer for generating signals while the drum is run over the ground surface for which the degree of compaction is to be determined. In order to eliminate factors which impede evaluation of the signals emanating from the signal transducers, the drum is configured so that its contact surface with the ground surface is as restricted as possible. This can be achieved by reducing the width of the drum.

Abstract: A double-safety arrangement for a self-propelled, hand-guided machine such as a duplex-vibratory roller equipped with a control column for facilitating control of the machine by an operator. The machine is also equipped with switching linkage actuable for engaging the machine for forward and rearward travel. The linkage has a neutral position to which it returns when no longer actuated for travel and whereat the machine is disengaged and comes to a halt. The double-safety arrangement includes an operating lever having a neutral center position and at least first and second travel positions for forward and rearward travel, respectively. A latching assembly is movable into a latched condition for transmitting the movements of the operating lever to the linkage thereby actuating the latter and into an unlatched condition whereat the linkage means is no longer actuable by the lever.

Abstract: The invention is directed to an arrangement for journalling large eccentric forces which are generated by a rotating eccentric assembly. One problem associated with the bearing arrangements of these forces is that the size of the bearing is extremely large which, in turn, results in shaft speed limits that are readily exceeded. By dividing the eccentric assembly into two or more tubular eccentric weights arranged coaxially in relation to each other and journalling these in separate bearings on shaft journals connected to the structure to which vibratory motion is to be imparted, a distribution of the eccentric forces is obtained together with a reduction of the bearing dimensions. The eccentric weights are driven by means of a drive rod arranged on a drive shaft interacting with the eccentric weights. The journalling arrangement and eccentric assembly can be part of a vibration arrangement for imparting vibratory motion to the roller structure of a compactor for compacting soil, asphalt or the like.