Patent ID: 6352386
Filing Date: 2002-03-05
Classification: E01C

Abstract:
A road finisher for paving a road surface over a reference plane, the road finisher comprising:a chassis; a tie bar having a front portion that is pivotally connected to the chassis at a vertically adjustable point of articulation; a floating laying beam connected to the tie bar at a rear end of the finisher, the floating laying beam including a basic beam having a planar bearing surface and a rear edge that is located above the reference plane, and an extendable beam adjacent to the basic beam, the extendable beam having a planar bearing surface and a rear edge that is located above the reference plane and offset, in a direction of laying, from the basic beam rear edge, the extendable beam being movable relative to the basic beam; a sensor arrangement including a pair of sensors, spaced apart in the direction of laying, mounted to the front portion of the tie bar, each sensor configured to measure a respective distance from the sensor to the reference plane, the sensor arrangement calculates a difference between the two measured distances to derive a control signal which represents a distance the extendable beam bearing surface is to be spaced relative to the basic beam bearing surface such that the rear edges of the basic beam and the extendable beam are equally spaced relative to the reference plane; and a height adjusting device that automatically moves the extendable beam relative to the basic beam based upon the control signal such that the rear edge of the extendable beam and the rear edge of the basic beam are maintained at equal distances above the reference plane.