Measuring equipment for the geometrical control and/or the truing of railway tracks

Claim 1

APPARATUS FOR THE DETECTION OF GEOMETRICAL IRREGULARITIES IN A RAILWAY TRACK, SAID APPARATUS COMPRISING MEANS FOR SENSING THE POSITION OF THE TRACK AT FOUR CONSECUTIVE REFERENCE POINTS ALONG THE TRACK AND INCLUDING FIRST AND SECOND FRAMES ROLLABLE ON THE TRACK SUPPORTING A RESPECTIVE PAIR OF NEIGHBORING SPACED SENSING DEVICES CORRESPONDING TO THE REFERENCE POINTS, SAID DEVICES BEING SUPPORTED ON THE FRAMES AT FIXED DISTANCES AND DEFINING RESPECTIVE REFERENCE BASES, COUPLING MEANS FOR SAID FRAMES INCLUDING TWO COUPLING MEMBERS EACH HAVING OPPOSITE ENDS, PIVOTS CONNECTING THE COUPLING MEMBERS AT THEIR ENDS TO THE FIRST AND SECOND FRAMES SUCH THAT STRAIGHT LINES PASSING THROUGH THE PIVOTS ON THE FRAMES HAVE AN INTERSECTION POINT LOCATED BETWEEN PLANES PERPENDICULAR TO THE RESPECTIVE REFERENCE BASES AT THE REFERENCE POINTS THEREOF CLOSER TO THE REFERENCE POINTS OF THE OTHER BASE, WHEREBY THE REFERENCE BASES FORM A REFERENCE SYSTEM FOR A CURVED TRACK LINE WITHOUT AN INFLECTION POINT, THE POSITION OF SAID TRACK LINE BEING DETERMINED BY THE GEOMETRICAL ARRANGEMENT OF THE COUPLING MEMBERS WITH RESPECT TO THE LENGTH OF THE REFERENCE BASES AND BY THE POSITION OF THREE OF THE SAID REFERENCE POINTS, AND MEANS FOR DETECTING THE DEVIATION OF ONE OF THE INTERIOR REFERENCE POINTS FROM THE FORM OF THE CURVED LINE AND FOR CONTROLLING A TRACK MOVING APPARATUS, SAID INTERMEDIATE REFERENCE POINT SERVING AS A CORRECTING POINT.