METHOD AND APPARATUS FOR PROVIDING GRADE CONTROL FOR THE SCREED OF A PAVER OR THE LIKE

摘要

A mobile grade reference device includes first means for sensing the vertical distance between successive points along a predetermined path on the subgrade and a grade reference point on such grade reference device. Second means are provided for continuously generating and storing first intelligence representative of the successive vertical distances sensed by such first means as the grade reference device travels over the subgrade. Third means on the paver senses the vertical distance between successive points along said predetermined path on the subgrade and a point on the screed. Fourth means continuously generate second intelligence representative of the successive vertical distances sensed by the third means as the paver travels along the aforesaid predetermined path. Fifth means compare the first and second intelligence as the latter is generated and produce grade control signals representative of the differences between the vertical distances sensed by the first and third means at the same points on the subgrade. A control mechanism for the screed is actuated by these grade control signals.