US3345746A - Apparatus for the continuously progressing lateral alignment of a curved track section - Google Patents

Apparatus for the continuously progressing lateral alignment of a curved track section Download PDF

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Publication number
US3345746A
US3345746A US299820A US29982063A US3345746A US 3345746 A US3345746 A US 3345746A US 299820 A US299820 A US 299820A US 29982063 A US29982063 A US 29982063A US 3345746 A US3345746 A US 3345746A
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track
point
cars
track section
ordinate
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US299820A
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English (en)
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Plasser Franz
Theurer Josef
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B35/00—Applications of measuring apparatus or devices for track-building purposes
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B2203/00—Devices for working the railway-superstructure
    • E01B2203/16—Guiding or measuring means, e.g. for alignment, canting, stepwise propagation

Definitions

  • This system makes it possible to move the track at any point and, as work proceeds continuously from point to point along the track, a continuous mean value of all ordinates of a curved track section over long distances may be obtained to obtain a smooth track.
  • this is accomplished by continuously sensing the curvature of the track and then laterally moving a track point rearwardly of the sensed track point and forwardly of a previously aligned track point into a desired alignment with the forward and rear points. This is done continuously and progressively along the track section and without first measuring its actual position.
  • chords are arranged between a series of equidistant points of a curved track section and the middle ordinates over the chords are drawn on the track section, the arrangement being such that the middle ordinates of chords between odd-numbered points of the series intersect the track section at the even-numbered points of the series, and vice versa.
  • the track section is then shifted laterally at each point of the series in sequence until the adjusted length of the middle ordinate intersecting the track section at the point of shifting assumes a value which is a linear function of the ordinate lengths prior to shifting at a point of the series behind the point of shifting, at the point of shifting, and at a point of the series ahead of the point of shifting.
  • the ordinate through the point immediately behind the point of shifting and the ordinate through the second point of the series ahead of the point of shifting are employed as references from which the magnitude of the shifting movement is determined.
  • a useful apparatus for carrying out this method comprises a mobile track aligning machine mounted for movement along the track section and a plurality of cars coupled forwardly and rearwardly to the machine [for movement along the track section with the machine.
  • Rigid chordal elements extend between alternate ones of the cars and each chord element bridges one of the cars between alternate cars.
  • Means pivotally connect the ends of the chordal elements to the alternate cars. The distance between adjacent cars is half the length of the chordal elements and the chordal elements are of equal length.
  • Means is mounted on the cars between the alternate cars and midway between the chordal element ends for measuring the ordinate of the respective chordal element.
  • the ordinate measuring ice means comprises an electrical control circuit, rectilinear potentiometers connected in the circuits and arranged midway between the chordal element ends, and elements connected to the chordal elements and mounted for slidable cooperation with respective ones of the potentiometers, the slidable elements and potentiometers extending perpendicularly in respect of the chordal elements.
  • an indicator means is connected in the electric control circuit .and is set to show when the ordinates measured by the potentiometers are of the desired length.
  • FIGS. 1 to 3 graphically illustrate geometric principles underlying the present invention
  • FIG. 4 shows an electrical control system for use with the invention.
  • FIG. 5 schematically illustrates apparatus useful for carrying out track alignment in accordance with this invention.
  • FIG. 1 illustrates an arcuate track section which is to be re-positioned at point B so that the actual track position indicated by broken line T be changed to the desired track position indicated by full line T.
  • a portion of chord AC underlying the arcuate track section is shown to define a middle ordinate b-y with track point B.
  • the length of the ordinate is accordingly changed, and the lengths of the ordinates drawn from the end points A and C on chords terminating at B and having each a length equal to AC are changed by half the amount of change of the ordinate length by but in the opposite sense, i.e. as the ordinate length b-y decreases, the length of the ordinates of track points A and C increases by half the amount of the decrease.
  • the length of ordinates b-y is decreased by the distance b-b i.e. the distance moving the track point B inwardly, while the ordinates a-x and c-z at track points A and C, respectively, are thereby lengthened by the distances x-x and z-z respectively.
  • the lengths of the track point ordinates, with their changes due to the alignment of track point B in relation to track points A and C, are shown on a larger scale at the bottom of FIG. 1, in which the ultimate ordinates ax yb and cz are of equal length as in a perfectly aligned circular aligned track section.
  • FIG. 2 shows the lengths of the ordinates of successive track points reached when the track is moved laterally at C after alignment at B, and afterwards at D, and so on at succeeding track points ahead of the previously moved track point in the manner described with reference to point B in FIG. 1.
  • the lateral alignment of the track at each succeeding forward point in the above-described manner must be efrfected according to a simple rule and the distance, by which each point is laterally moved, is controlled according to the actual position of the arcuate track section to be aligned or straightened out.
  • the graph of FIG. 3 illustrates a preferred embodiment of our method in which the magnitude of the lateral displacement of a point B of the track section is determined by establishing chords AC, BD, CE, EF, etc. on the track section, and drawing middle ordinates from the chords on the curve representing the track section at A, B, C, D, etc. in a manner obvious from FIG. 1.
  • the displacement of point B in an unadjusted part of the track section is determined as a linear function of the actual unadjusted lengths of the ordinates drawn on point A in a correct or previously adjusted track section, on point B, and on point D ahead of point D in a track section subsequently to be adjusted.
  • a simple rule permits the displacement of point B to be determined.
  • This rule is mathematically determined by the equation wherein is the adjusted ordinate at track point B, a is the actual ordinate at track point A, b is the actual ordinate at track point B and d is the actual ordinate at the most forward point D of the track section to be aligned.
  • a further improvement in the track alignment according to this invention may be obtained when the procedure is reversed at the end of the track arc, i.e. if the same alignment method is used again at the end of the forward movement in the opposite direction.
  • the alignment is at an optimum. In most practical instances, however, a single forward pass over the track section to be aligned will suffice to obtain the desired track alignment and it will not be necessary to pass backwardly over such .a section to obtain the optimum accuracy.
  • the above-described alignment method may be readily carried out with an electrical control apparatus schematically shown in FIG. 4.
  • the electrical control circuit consists of a suitable source of current 13, such as a 12- volt storage battery, feeding power to the three rectilinear potentiometers 10, 11 and 12 connected in parallel to the current source by suitable electrical conductors.
  • Potentiometers 10, 11 and 12 are respectively mounted at track points A, B, and D, graphically shown in FIG. 3.
  • the potentiometers may have a resistance of 100 ohm and deliver an electrical parameter corresponding to the respective ordinates at those points.
  • Resistance 14 is connected in shunt between potentiometers and 11, and resistance 14' is connected in shunt between potentiometers 11 and 12. If the resistance 14' is twice as strong as resistance 14, the potentiometer circuit will be balanced by the resistances when the electrical parameter measuring the ordinate at B, i.e. at potentiometer 11, has reached about one third of the slope between the electrical parameters measuring the ordinates at track points A and D, i.e. at potentiometers 10 and 12, respectively.
  • An electrical parameter indicator dial 15 is mounted in the line between resistance 14 and potentiometer 11.
  • track point B is in the desired position.
  • the needle deviates from zero, it indicates the direction in which the ordinate of point B must be changed, i.e. the track must be moved there, to attain circuit balance.
  • the needle will point to zero and lateral alignment of the track at this point is discontinued.
  • This realignment of the track section may proceed continuously from point to point, as described hereinabove, the same procedure being followed at each succeeding point, as the alignment proceeds along the track.
  • FIG. 5 A suitable apparatus for such continuous track alignment is illustrated in FIG. 5, making use of the electrical control circuit of FIG. 4.
  • the illustrated apparatus comprises a conventional mobile track aligning machine 7 mounted on wheels for movement along rails 8 and 9 of the track section to be aligned.
  • the track aligning machine is provided at its forward and rear ends with suitable rail clamps and means for laterally moving the clamped rails to the left or right, as may be desired.
  • Such track aligning machines are quite conventional and since their structure forms no part of the present invention, the machine has been indicated on the drawing merely by a box in broken lines so as to simplify the illustration and not to obscure the novel parts of the apparatus.
  • the alignment apparatus of this invention is characterized by a plurality of measuring cars coupled to the front and the rear of the track aligning machine.
  • a plurality of measuring cars coupled to the front and the rear of the track aligning machine.
  • cars 1, 2. and 3 being coupled to the rear of machine 7 while cars 4, 5 and 6 are coupled to its front.
  • Adjacent cars are coupled to each other and cars 3 and 4 adjacent to machine 7 are coupled to the latter.
  • at least one of the cars 3, 4 is adjustably coupled to the machine, i.e. by a telescoping rod, so that the cars may be moved closer to, or farther from, the centrally arranged track aligning machine 7.
  • FIG. 5 which only illustrates the potentiometers of the control circuit mounted on respective ones of the measuring cars.
  • Potentiometer 10 is mounted on car 2 corresponding to track point A in the graph of FIG. 3
  • potentiometer 11 is mounted on car 3 corresponding to track point B
  • potentiometer 12 is mounted on car 5 corresponding to track point D.
  • the measuring cars are equidistant from each other along the track are which is to be aligned and rigid chordal elements of equal lengths extend between alternate cars.
  • the illustrated chordal elements are rigid rods and, as shown, rod 17 extends from car 1 to car 3, bridging car 2 with its potentiometer 10, rod 18 extends from car 2 to car 4, bridging car 3 with its potentiometer 11, as well as track aligning machine 7, and rod 19 extends from car 4 to car 6, bridging car 5 with its potentiometer 12.
  • the ends of the chordal rods 17, 18 and 19 are pivotally mounted on the respective cars and one end of each rod is also longitudinally slidably mounted in a suitable hearing so as to permit for minor changes in the distances between the cars to which the respective rod is attached.
  • the end of rod 17 Will slide in its bearing on car 3 to allow for such relative movement between the cars along the track.
  • the respective potentiometers are centered in respect of the ends of the chordal rods so that the ordinates of the curved rail 8 may be measured there in reference to the chords.
  • Suitable slidable elements, such as pistons, are mounted at the center points of the chordal rods and cooperate with the potentiometers to produce an electrical parameter corresponding to the respective ordinate.
  • This apparatus operates as follows while it proceeds continuously in the direction of the arrow indicated in FIG. 5:
  • the mobile track aligning machine 7 moves along the track and every time it enters a track arc, such as illustrated, or an ill aligned track section, the measuring cars are pressed into contact with rail 8 by spring 16 and the slidable elements cooperating with the potentiometers on cars 2, 3 and 5, but rigidly connected to the chordal rods, are correspondingly moved a distance accurately corresponding to the ordinates at these track points in reference to the respective chordal rods.
  • the indicator dial 15 of the electrical control circuit of which the potentiometers are a part (see FIG. 4), is mounted on the track aligning machine 7 so that it may readily be read by an operator riding thereon.
  • the position of the indicator needle will show the direction in which the track must be laterally shifted at car 11, which is directly adjacent the rear rail clamps of the machine and all the operator has to do is to actuate the track shifting mechanism until the indicator needle points to zero.
  • the alignment may be effected at any desired point of the track without change in position of an adjacent track point which may have been previously aligned.
  • the minimum distances between alignment points may best be ascertained by practical experience. If accuracy of alignment requires a double pass, i.e., reversal of the alignment direction after a track section has been lateral- 1y aligned in one longitudinal direction, the apparatus will have to be adjusted for the backward pass over the aligned section.
  • potentiometers 10 and 12 are reversed in the circuit and potentiometer 11 is moved from car 3 to car 4 but remains in the same position in the circuit.
  • the rigid chordal rod 18 is moved to extend between cars 3 and 5 and, during the backward pass, the, apparatus reads the movement of the track at car 4, instead of car 3.
  • An apparatus for the continuously progressing lateral alignment of a curved track section comprising a mobile track aligning machine mounted for movement along the track section, a plurality of cars coupled forwardly and rearwardly to the machine for movement along the track section with the machine, rigid chordal elements extending between alternate ones of said cars, each chord element bridging one of said cars between the alternate cars, means for pivotally connecting the ends of the chordal elements to said alternate cars, the distance between adjacent ones of said cars being half the length of said chordal elements and said chordal elements being of equal length, and means mounted on said cars between the alternate cars and midway between the chordal element ends for measuring the ordinate of the respective chordal element.
  • said means for measuring the ordinates comprises an electrical control circuit, rectilinear potentiometers connected in said circuit and arranged midway between the chordal element ends, and elements connected to said chordal elements and mounted for slidable cooperation with respective ones of said potentiometers, the slidable elements and potentiometers extending perpendicularly in respect of the chordal elements.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
US299820A 1962-08-06 1963-08-05 Apparatus for the continuously progressing lateral alignment of a curved track section Expired - Lifetime US3345746A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT635262A AT250419B (de) 1962-08-06 1962-08-06 Verfahren und Einrichtung zum kontinuierlich fortschreitenden Ausrichten von Gleisen, insbesondere Gleisbögen

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US (1) US3345746A (de)
AT (1) AT250419B (de)
CH (1) CH413888A (de)
DE (1) DE1271142B (de)
GB (1) GB1042256A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3816927A (en) * 1970-07-02 1974-06-18 J Theurer Mobile track survey apparatus for determining a track parameter
US3821853A (en) * 1970-07-02 1974-07-02 Plasser Bahnbaumasch Franz Mobile track survey apparatus
US3828440A (en) * 1968-04-09 1974-08-13 Plasser Bahnbaumasch Franz Track surveying
US4156971A (en) * 1977-11-03 1979-06-05 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Contour measurement system
US4574704A (en) * 1982-03-24 1986-03-11 Matisa Materiel Industriel S.A. Apparatus for guiding a railroad track positioning device
US4880190A (en) * 1986-12-11 1989-11-14 Southern Pacific Transportation Co. Locomotive curve tracking system
US20100154233A1 (en) * 2007-07-31 2010-06-24 Josef Theurer Method of measuring a track position
US10427697B2 (en) 2017-07-04 2019-10-01 Nordco Inc. Rail pressure adjustment assembly and system for rail vehicles

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1127204A (en) * 1912-07-23 1915-02-02 William T Dobyns Method of lining railroad-curves.
US2485810A (en) * 1942-05-12 1949-10-25 Bienfait Louis Apparatus for determining the correct tracing of railway tracks
US2859528A (en) * 1953-03-12 1958-11-11 Matisa Materiel Ind Sa Devices for measuring the horizontal coordinates of a railway track
US3126633A (en) * 1964-03-31 Method and apparatus for measuring the height of

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE825427C (de) * 1950-12-10 1951-12-17 Deutshe Bundesbahn Vertreten D Gleismessdraisine
AT227749B (de) * 1959-05-29 1963-06-10 Plasser Bahnbaumasch Franz Verfahren zum Ausgleichen von Richtungsfehlern in Gleisen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3126633A (en) * 1964-03-31 Method and apparatus for measuring the height of
US1127204A (en) * 1912-07-23 1915-02-02 William T Dobyns Method of lining railroad-curves.
US2485810A (en) * 1942-05-12 1949-10-25 Bienfait Louis Apparatus for determining the correct tracing of railway tracks
US2859528A (en) * 1953-03-12 1958-11-11 Matisa Materiel Ind Sa Devices for measuring the horizontal coordinates of a railway track

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3828440A (en) * 1968-04-09 1974-08-13 Plasser Bahnbaumasch Franz Track surveying
US3816927A (en) * 1970-07-02 1974-06-18 J Theurer Mobile track survey apparatus for determining a track parameter
US3821853A (en) * 1970-07-02 1974-07-02 Plasser Bahnbaumasch Franz Mobile track survey apparatus
US4156971A (en) * 1977-11-03 1979-06-05 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Contour measurement system
US4574704A (en) * 1982-03-24 1986-03-11 Matisa Materiel Industriel S.A. Apparatus for guiding a railroad track positioning device
US4880190A (en) * 1986-12-11 1989-11-14 Southern Pacific Transportation Co. Locomotive curve tracking system
US20100154233A1 (en) * 2007-07-31 2010-06-24 Josef Theurer Method of measuring a track position
US7979995B2 (en) * 2007-07-31 2011-07-19 Franz Plasser Bahnbaumaschinen-Industriegesellschaft M.B.H. Method of measuring a track position
US10427697B2 (en) 2017-07-04 2019-10-01 Nordco Inc. Rail pressure adjustment assembly and system for rail vehicles

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Publication number Publication date
GB1042256A (en) 1966-09-14
CH413888A (de) 1966-05-31
AT250419B (de) 1966-11-10
DE1271142B (de) 1968-06-27

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