Abstract: A device (1) for supervising the function of an electric consumer (2), such as a heating unit in a road finisher, is connected in a supply circuit (3) of electrical current of a consumer, and has an induction coil (4) associated with the current supply to which is connected a circuit (6) for detecting and indicating a voltage induced in the coil (4) by the supply current.

Abstract: In a paver comprising a paving screed and at least one working component which is heated by means of at least one electric heating element H, e.g. a smoothing plate, the heating element H being secured in heat tampering condition at a heating area of the working component, the heating element containing at least one heating coil, the heating element is a plane heating element, the heating coil is a heating conductor which is wound in spirals around plane carrier material, and the peripheral form of the carrier material and/or the winding density or the winding course of the heating conductor is adapted to a predetermined heating picture in the heating area, respectively.

Abstract: According to the method for heating the paving screed of a road finisher, said paving screed including a heating means with several heat elements being supplied with electric power from a rotary current generator and being switched on and off by means of a control device, at least two of said heating elements are switched on and switched off periodically and alternatingly in dependence from the operation temperature of said generator and/or the operation temperature of paving screed components contacting paving material. Said heating means comprises in its control device a microprocessor management section with a program for alternatingly switching between heating elements in cycles under consideration of a predetermined combination of operational parameters.

Abstract: In a slip-form paver for road constructions of concrete, at least one transverse distribution means, at least one stripper device, one slip form and at least one concrete paving screed are arranged on a support frame, said concrete paving screed being a high-compaction paving screed which is floatingly hinged by means of at least two extension bars, which are located approximately in parallel with the base course, to pulling points of the support frame which are positioned in the traveling direction at a distance in front of the high-compaction paving screed.

Abstract: In an apparatus (G) for laying road pavement layers composed of first and second pavement material grades, there are provided at least one road finisher (F', F1, F2) comprising a material hopper, and a feeder (B) arranged upstream thereof and including a bulk material hopper (2) for the first pavement material grade (A) as well as a longitudinal conveying means (3, 4), wherein in the apparatus (G) the sole road finisher (F') comprises a second material hopper (29) for the second pavement material grade (B1) or a second road finisher comprising a material hopper (29') for the second pavement material grade (B1) is provided behind a first road finisher (F1), and the feeder (B) comprises a superstructure (6) extending above the bulk material hopper (2) and the first longitudinal conveying device (3, 4) and including a second longitudinal conveying and intermediate storage device (7, 10, 14) which extends either up to and over the second material hopper (29) of the sole road finisher (F') or the material hopper (

Abstract: A road finisher, which is used for simultaneously applying at least two surface layers comprises a chassis, a travelling mechanism, at least two premix containers arranged on said chassis, a lateral distributor associated with the respective premix container and adapted to have material supplied thereto via a conveyor path extending in the chassis, and lateral outriggers attached to the chassis as well as a dragged road-surface applying device used for applying a surface layer and arranged on said outriggers, all road-surface applying devices being high-compaction road-surface applying screeds for recompaction-free application of a surface layer, and each high-compaction road-surface applying screed constituting a rear screed, when seen in the direction of movement, which is constructed as a high-compaction road-surface applying screed which is adapted to be used for applying and compacting concrete.

Abstract: A road finisher comprising a chassis is described, the chassis being movable on a travelling gear and carrying a front stock hopper, a primary drive unit an incorporated secondary drive units. The road finisher is provided with a paving screed which is dragged at the rear and which is articulated on the chassis via laterial outriggers, as well as with a lifting device which is provided between the chassis and the outrigger and by means of which the paving screed can be moved to a transport position raised from the ground. The troublesome influence of the paving screed when the road finisher travels for the purpose of transportation is reduced or eliminated to a large extent in the case of such a road finisher.

Abstract: A lubricant supply limiting device (1') for a lubrication system, wherein at least one fixed throttle (F) and a servo pressure controller (3) provided with a variable throttle (D) are disposed in the flow path, and wherein an adjustment member (6') for the variable throttle (D) is subjected to the resilient action of an actuator, is provided with a proportional solenoid (15) acting as the actuator for selectively adjusting the lubricant flow to the demand at specified lubrication points. A proportional solenoid (15) is moreover advantageous for general use in servo pressure controllers to act on the adjustment member thereof in a manner permitting the pressure differential maintained by the servo pressure controller and determined by a fixed throttle to be varied.

Abstract: In a device for the dosing of lubricants which comprises at least one manual throttling element limiting the volume flow and a flow metering device connected downstream of it, which contains at least one sensor element movable through the volume flow, a dynamic flow metering means (M) is connected downstream in the manual throttling element (D) whose sensor element (S) moves also after the reaching of the nominal volume flow and a display means (A) is provided on the dynamic flow metering device (M), which represents the actual volume flow from the movement of the sensor element (S).

Abstract: The present invention refers to a method for controlling the vertical adjustment of a levelling and compacting plank drawn by a road-construction machine. During the working procedure the level of the plank, which is in floating contact with the material, is adjusted automatically. The present invention aims at preventing undesirable lifting of the plank caused by material which is located ahead of the plank and the flowability of which was changed due to an interruption in the motion of the machine. Hence, the invention employs the feature that, when the travelling mechanism is switched on, lifting of the plank, which is blocked against lowering when the machine is standing still, is blocked as well and that the blocking is eliminated only after a predetermined period of time.

Abstract: The invention relates to a progressive distributor for lubricants, comprising at least two distributor sections each including a double piston guided in a cylinder chamber for reciprocating therein between two end positions, a supply passage, and a number of passages interconnecting adjacent cylinder chambers as well as the first cylinder chamber and the last cylinder chamber in a common plane and leading to discharge outlets, the two end sections of each cylinder chamber acting alternately as a pressure chamber for pressurizing the respective piston and as a metering chamber for metering the lubricant. In known progressive distributors having cylinder chambers disposed in a common plane, the presence of entrapped air particularly in the long passages interconnecting the first and last cylinder chambers frequently prevents the lubricant from being properly discharged.

Abstract: The invention relates to a travelling finisher apparatus for laying down a road surfacing layer of a bituminous compound material, comprising a first precompacting and levelling screed carried by a frame, and optionally a second levelling screed connected to a vibratory drive arrangement, whereby a particularly high degree of compaction is achieved so that subsequent roller compaction is not required. This is accomplished by providing a vertically guided compactor bar extending transversely of the direction of travel at the rear of the first screed and being of substantially narrower width than said first levelling plank, said compactor bar being continually in contact with the surface of the precompacted surfacing layer and adapted to be acted on by linear pulsating forces acting between the frame and the compactor bar, and generated by a drive source the reaction forces of which are absorbed by the frame.