US3821932A - Apparatus for indicating and correcting a track position deviation - Google Patents

Apparatus for indicating and correcting a track position deviation Download PDF

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Publication number
US3821932A
US3821932A US00292880A US29288072A US3821932A US 3821932 A US3821932 A US 3821932A US 00292880 A US00292880 A US 00292880A US 29288072 A US29288072 A US 29288072A US 3821932 A US3821932 A US 3821932A
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US
United States
Prior art keywords
track
target
emitter
radiation
track position
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US00292880A
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English (en)
Inventor
J Theurer
F Ollerer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Franz Plasser Bahnbaumaschinen Industrie GmbH
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Franz Plasser Bahnbaumaschinen Industrie GmbH
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Classifications

    • 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
    • E01B33/00—Machines or devices for shifting tracks, with or without lifting, e.g. for aligning track, for shifting excavator track
    • E01B33/02—Machines or devices for shifting tracks, with or without lifting, e.g. for aligning track, for shifting excavator track for slewing, i.e. transversely shifting, in steps
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
    • G01B11/27—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
    • G01B11/272—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes using photoelectric detection means
    • 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

  • ABSTRACT Apparatus for indicating a deviation of the position of a track from a desired position and for correcting the track position comprises an emitter of a reference beam, a target for the emitted beam, and a lens for defleeting the beam intermediate the emitter and target, the track position deviation being indicated at the intermediate point.
  • the target indicates a normal path of the emitted beam corresponding to the desired track position, and the lens deflects the beam from the normal path when it is at a track point whose position deviates from the desired position. Track correction is controlled by the deflected beam.
  • PATENTEHJUL 21974 SHEET 3 [IF 3 APPARATUS FOR INDICATING AND CORRECTING A TRACK POSITION DEVIATION The present invention relates to an apparatus for indicating a deviation of the position of a track from a desired position, and for correcting such deviation.
  • Apparatus of this type comprises an emitter of a beam of radiation, which may advantageously be a laser beam, a target for the emitted beam of radiation, which may be a beam receiver or a spotboard, for example, and a track point intermediate of the emitter and target.
  • the beam of radiation constitutes a reference defined by the emitter as one end point thereof, the target as another end point thereof, and the intermediate point at which the deviation from the desired track position is to be indicated.
  • a stop is supported on the track at the intermediate point to mask the emitted beam from the target when the track is in the desired position.
  • the track is at a low point, it is lifted until the stop enters into the path of the beam.
  • the track is misaligned, it is laterally moved until the stop enters intothe path of a reference beam extending parallel to the desired alignment of the track.
  • This invention has the primary object to provide an apparatus of the first described type which is not only simple in construction but also universally useful not only for track leveling and lining but also for indicating and correcting track position deviations in arcuate track curves.
  • the above and other objects are accomplished in accordance with the invention by arranging a means for deflecting the beam of radiation, such as an optical lens or an electron lens, at the intermediate point.
  • the target has means indicating a normal path of the emitted beam of radiation corresponding to the desired track position, and the beam deflecting means is arranged to deflect the beam from the normal path when the beam deflecting means is at a track point .whose position deviates from the desired position.
  • the apparatus may be used for indicating grade and/or alignment deviations. Combined with track position correction means, the apparatus may be used for simultaneously indicating and correcting such deviations.
  • a laser beam constituting a coherent beam of light which may be emitted as a planar beam in a single plane or two perpendicularly intersecting planes, is particularly advantageous. If a convex optical lens with a horizontal axis is used for beam deflection, it maybe used for track leveling, while a cylindrical lens with a vertical axis is used for track lining. A spherical lens will serve for leveling and lining since it can be used for deviations in grade and alignment, i.e. perpendicularly and transversely of the track.
  • the emitter, the beam deflecting means and the target are carried respectively on three carriages mounted for mobility on the track and spaced from each other.
  • at least the carriages carrying the reference beam emitter and the target are laterally pressed against a selected rail of the track.
  • means for laterally pressing track carriages against a grade rail have been disclosed in US. Pat. Nos. 3,334,592,'dated Aug. 8, 1967, and No. 3,557,459, dated Jan. 26, 1971.
  • the carriage carrying the emitter is mounted for mobility on the track on at least two axles, which enables the emitter to emit the beam at least approximately parallel or tangentially to the desired position of the track, and the central axis of the beam deflecting means is arranged pivotal in relation to the carriage carrying the emitter so that the central axis passes through the emitter in every pivotal position of the beam deflecting means.
  • the apparatus comprises track position correction means, such as track lifting and/or lining means, and the beam deflecting means is arranged in the region thereof so that it may be used not only for indicating track deviations but also for correcting them.
  • the target is advantageously a receiver for the emitted beam of radiation and the means indicating the normal path of the emitted beam of radiation comprises control means responsive to the deflection of the beam from the normal path for actuating the track position correction means.
  • the carriages carrying the emitter and the beam deflecting means may be coupled to the machine for mobility therewith.
  • the carriage carrying the target may be selfpropelled and preferably remote controlled, or it may also be coupled to the track position correction machine.
  • FIG. 4 is a top view of the apparatus of FIG. 3;
  • FIG. 5 is a front view of a receiver for a laser beam emitted in two perpendicularly intersecting planes
  • FIG. 6 is a view similar to that of FIG. 4, showing this apparatus in use in an arcuate track curve
  • FIG. 7 is an enlarged topview of a portion of the arrangement of FIG. 6, also showing the calculation of the measuring parameters
  • FIG. 8 is a side view of a track leveling and lining machine incorporating the apparatus of this invention.
  • FIG. 9 schematically shows the reference beam paths of the apparatus of FIG. 8.
  • Carriage 2 which carries the emitter of a beam of radiation, has two axles.
  • Carriage 5 As schematically indicated by the double-headed arrows 5 extending transversely of track 1, means is provided for laterally pressing the carriages 2 and 4 against a selected grade rail of the track. Since such means is known per se, as indicated hereinabove, and forms no part of the present invention, except in the disclosed combination, it has not been illustrated in detail to avoid encumbering the drawing with prolix details.
  • carriage 2 is shown carrying emitter 6 emitting a planar beam of radiation 7 which is at least substantially parallel to the desired plane of the track.
  • a coupling linkage 8 connects the carriage 3 to the carriage 2, carriage 3 being a bogie running on a single axle.
  • Bogie 3 carries cylindrical optical lens 9 whose axis extends substantially horizontally transversely to the track. As best shown in FIG. 2, one end of the coupling linkage 8 is pivotally journal'ed on a support rod for emitter 6, which extends through the center of the emitter. In this manner, the bogie 3 is pivotal in relation to carriage 2 so that the central axis 12 (shown in chain-dotted line) passes at least approximately through the center point of emitter 6 in every pivotal position of the beam reflecting lens 9.
  • Carriage 4 which carries a pair of spotboards 11, 11
  • FIGS. 1 and 2 operates as follows:
  • the planar beam 7 emitted from emitter 6 passes through the horizontal axis of lens 9 and, therefore, is not deflected thereby on its way to targets 11.
  • the beam is aligned with the horizontal center marker on the spotboards which indicates the normal, straight path of the emitted beam corresponding to the desired track position, i.e. the vertical distances of the beam from the track plane are identical at the emitter 6, lens 9 and spotboards 11.
  • the apparatus of FIGS. 3 and 4 operates in the identical manner, the direction of operation being lateral or transversely of the track instead of vertical so that the apparatus .works in track lining rather than leveling.
  • the emitter 15 is arranged to produce a beam 16 extending in a plane substantially perpendicular to the plane of the track.
  • the lens 17 is also turned by so that its axis entends vertically.
  • a spotboard 18 is positioned intermediate the track rails and has a vertical marker indicating a normal path of emitted beam 16 when the latter passes from the emitter through the vertical axis of lens 17, i.e. when it is not deflected thereby. This condition prevails as long as the track remains straight, i.e.
  • the beam plane is substantially parallel to the track.
  • the planar beam 16 passes through the lens at a point other than the vertical lens axis so that the beam is deflected to form a beam portion 19 out of focus with spotboard 18.
  • the lens is moved laterally until the beam again passes through its vertical axis, the normal path will be restored and the beam will be focused on the vertical marker of the spotboard.
  • the target may be a beam receiver 20 for a laser beam, instead of a spotboard.
  • the apparatus may be used for indicating lateral as well as vertical deviations of the track position.
  • the receiver has an array of light and/or temperature sensitive elements 23 responsive to the deflection of the beam from its normal path, when it is centered on the receiver, for controlling the actuation of track position correction means, such as the track lifting and/or lining means shown in the track leveling and lining machine of FIG. 8.
  • FIGS. 6 and 7 The method for indicating a track deviation is illustrated in FIGS. 6 and 7.
  • This method uses the apparatus of FIGS. 3 and 4, the beam 16 being emitted in the direction of a tangent to the arcuate track curve at the track point at which emitter 15 is positioned.
  • the term direction of a tangent means a direction substantially along the tangent of the curve at this point or a direction substantially parallel thereto.
  • the lens 17 is so arranged in the normal path of the beam 16 that it deflects the beam to the target, as shown in broken lines in FIG. 6, which indicates the normal beam path corresponding to the desired position of the track curve.
  • a marker on the spotboard 18 indicates when the beam takes its normal path, i.e. when the track has the desired curve.
  • the lens will deflect the beam, as shown in full lines, so that it no longer focuses on the spotboard.
  • Latand B m the above equations show an error of 0.55 percent in the value off. Such a margin of error is equalized by the natural spherical aberrations of normal lenses.
  • FIG. 8 shows a conventional track tamping, leveling and lining machine combined with an apparatus according to this invention.
  • the illustrated machine is of known design and comprises a tie tamper unit 24, and a leveling and lining unit with pairs of track gripping rollers 26, 26 for lifting the track and pairs of track engaging rollers 27, 27 for lining the track.
  • Such track position correction means are conventional and their specific structure forms no part of the invention. Accordingly, any such suitable means may be used in combination with the apparatus of the present invention.
  • the carriage 2 of the latter apparatus is coupled to the rear end of the machine by coupling linkage 28, the reference beam emitter 29 being mounted on carriage 2 for emitting a beam of radiation in two perpendicularly intersecting planes.
  • a coupling linkage 8 connects the carriage 2 to carriage 3, a spherical lens 30 being mounted on carriage 3.
  • the carriage 4, whereon the beam receiver 20 is mounted, is connected to the front end of the machine by coupling linkage 28a.
  • bogie 3 with deflecting lens 30 is mounted at the tamper unit and adjacent the track leveling and lining unit, i.e. in the region of the track position correction means.
  • the beam 31 of cross-like cross section passes through lens 30 and is not deflected thereby on its way to receiver 20 when the track is in its desired position.
  • the beam portion 31a which is parallel to the plane of the track, as well as the beam portion 31b, which is perpendicular thereto, pass undeflected through the lens and thus remain centered on the receiver.
  • the beam is not focused on the lightand/or heat sensitive control elements on the receiver.
  • the bogie 3 passes a misaligned track point to move lens 30 out of its centered position, the beam will be deflected by the lens so as to focus on at least some of the elements 22 arrayed on the receiver, causing these control elements to actuate the operation of the track position correction means selectively in a known manner to reposition the track until it has reached the desired position.
  • An apparatus for indicating a deviation of theposition of a track from a desired position and for correcting the track position comprising i. an emitter of a beam of radiation,
  • the beam of radiation constituting a reference defined by the emitter as one end point thereof, the target as another end point thereof, and the beam deflecting means as an intermediate point at which the deviation from the desired track position is to be indicated,
  • the target having means indicating a normal path of the emitted beam of radiation corresponding to the desired track position
  • the beam deflecting means being arranged to deflect the beam from the normal path when the beam deflecting means is at a track point whose position deviates from the desired position
  • the apparatus of claim 1 further comprising three carriages mounted for mobility on the track and spaced from each other, respective ones of the carriages carrying the emitter, the beam deflecting means and the target.
  • the carriage carrying the emitter is mounted for mobility on the track on at least two axles
  • the beam deflecting means has a central axis and is arranged pivotal in relation to the carriage carrying the emitter so that the central axis of the beam deflecting means passes through the emitter in every pivotal position of the beam deflecting means.
  • the track position correction means comprises track lifting means.
  • the target is a receiver for the emitted beam of radiation and the means indicating the normal path of the emitted beam of radiation comprises control means responsive to the deflection of the beam from the normal path and constituting the control for actuating the track position correction means.
  • the emitter is arranged to emit a beam of radiation extending in at least one plane.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Control Of Position, Course, Altitude, Or Attitude Of Moving Bodies (AREA)
  • Optical Recording Or Reproduction (AREA)
US00292880A 1971-10-08 1972-09-28 Apparatus for indicating and correcting a track position deviation Expired - Lifetime US3821932A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT874171A AT324391B (de) 1971-10-08 1971-10-08 Einrichtung zur feststellung der abweichung der lage eines gleises von seiner soll-lage

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US3821932A true US3821932A (en) 1974-07-02

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US (1) US3821932A (en, 2012)
JP (1) JPS5626803B2 (en, 2012)
AT (1) AT324391B (en, 2012)
CA (1) CA975950A (en, 2012)
CH (1) CH563500A5 (en, 2012)
DE (1) DE2241366C3 (en, 2012)
FR (1) FR2155643A5 (en, 2012)
GB (1) GB1400844A (en, 2012)
HU (1) HU171639B (en, 2012)
IT (1) IT988566B (en, 2012)
NL (1) NL7213543A (en, 2012)
ZA (1) ZA727110B (en, 2012)

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4512560A (en) * 1981-10-06 1985-04-23 Krauss-Maffei Aktiengesellschaft Apparatus for mounting rails on a rigid rail beam
US4535699A (en) * 1982-03-31 1985-08-20 Les Fils D'auguste Scheuchzer S.A. Device for controlling a railroad track making or repairing machine
US4574704A (en) * 1982-03-24 1986-03-11 Matisa Materiel Industriel S.A. Apparatus for guiding a railroad track positioning device
US4724653A (en) * 1985-07-02 1988-02-16 Les Fils D'auguste Scheuchzer S.A. Process for repairing or laying a railroad track
US5090329A (en) * 1989-10-25 1992-02-25 Franz Plasser Bahnbaumaschinen Industriegesellschaft M.B.H. Reference system for track working machine
US5255066A (en) * 1991-06-10 1993-10-19 Matisa Materiel Industriel, S.A. Measuring device for track building machines
US6647891B2 (en) * 2000-12-22 2003-11-18 Norfolk Southern Corporation Range-finding based image processing rail way servicing apparatus and method
WO2005103385A1 (de) * 2004-04-21 2005-11-03 J. Müller AG Verfahren zur vermessung von fahrbahnen
CN103453856A (zh) * 2013-09-30 2013-12-18 湘潭电机股份有限公司 一种长距离平面或导轨的测量方法
CN104176090A (zh) * 2013-05-21 2014-12-03 昆明中铁大型养路机械集团有限公司 基于激光开关的轨道检测仪
US8914171B2 (en) 2012-11-21 2014-12-16 General Electric Company Route examining system and method
US20150330039A1 (en) * 2014-05-13 2015-11-19 Laserline Mfg., Inc. Paint-striping laser guidance system and related technology
US9255913B2 (en) 2013-07-31 2016-02-09 General Electric Company System and method for acoustically identifying damaged sections of a route
US20170022672A1 (en) * 2015-07-24 2017-01-26 Dutch Enginnering Llc Projector for track alignment reference systems
US9671358B2 (en) 2012-08-10 2017-06-06 General Electric Company Route examining system and method
US9689681B2 (en) 2014-08-12 2017-06-27 General Electric Company System and method for vehicle operation
US9702715B2 (en) 2012-10-17 2017-07-11 General Electric Company Distributed energy management system and method for a vehicle system
US9733625B2 (en) 2006-03-20 2017-08-15 General Electric Company Trip optimization system and method for a train
US9828010B2 (en) 2006-03-20 2017-11-28 General Electric Company System, method and computer software code for determining a mission plan for a powered system using signal aspect information
US9950722B2 (en) 2003-01-06 2018-04-24 General Electric Company System and method for vehicle control
US9956974B2 (en) 2004-07-23 2018-05-01 General Electric Company Vehicle consist configuration control
US10308265B2 (en) 2006-03-20 2019-06-04 Ge Global Sourcing Llc Vehicle control system and method
US10345099B2 (en) * 2015-03-18 2019-07-09 Focus Point Solutions Reference system for track alignment machines
CN111366107A (zh) * 2020-03-16 2020-07-03 上海机电工程研究所 五轴转台轴线测量组件
CN115110355A (zh) * 2021-03-19 2022-09-27 中国核工业二三建设有限公司 一种高精度轨道调整辅助工装
CN118424236A (zh) * 2024-07-04 2024-08-02 宁波中车时代传感技术有限公司 一种基于线激光弦线的纵向水平检测装置

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5230596U (en, 2012) * 1975-02-25 1977-03-03
JPS52124607A (en) * 1976-04-12 1977-10-19 Kumagai Gumi Co Ltd Device for detecting and correcting track position displacement of magnetic buoyyup running vehicle
US4372640A (en) * 1981-03-23 1983-02-08 Lacroix Eugene F Line maker with laser source
DE3444723A1 (de) * 1984-12-07 1986-06-12 Richard Gehrcke Vorrichtung zum erfassen der gleisgeometrie mit einem laser
EP0293015B1 (fr) * 1985-07-02 1991-10-02 Les Fils D'auguste Scheuchzer S.A. Dispositif pour la commande d'une machine à niveler et riper une voie de chemin de fer
EP2960371B1 (de) * 2014-06-27 2017-08-09 HP3 Real GmbH Vorrichtung zum Vermessen von Gleisen

Citations (1)

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US3381626A (en) * 1966-03-25 1968-05-07 Jackson Vibrators Track working assembly and control system

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US3381626A (en) * 1966-03-25 1968-05-07 Jackson Vibrators Track working assembly and control system

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4512560A (en) * 1981-10-06 1985-04-23 Krauss-Maffei Aktiengesellschaft Apparatus for mounting rails on a rigid rail beam
US4574704A (en) * 1982-03-24 1986-03-11 Matisa Materiel Industriel S.A. Apparatus for guiding a railroad track positioning device
US4535699A (en) * 1982-03-31 1985-08-20 Les Fils D'auguste Scheuchzer S.A. Device for controlling a railroad track making or repairing machine
US4724653A (en) * 1985-07-02 1988-02-16 Les Fils D'auguste Scheuchzer S.A. Process for repairing or laying a railroad track
US5090329A (en) * 1989-10-25 1992-02-25 Franz Plasser Bahnbaumaschinen Industriegesellschaft M.B.H. Reference system for track working machine
US5255066A (en) * 1991-06-10 1993-10-19 Matisa Materiel Industriel, S.A. Measuring device for track building machines
US6647891B2 (en) * 2000-12-22 2003-11-18 Norfolk Southern Corporation Range-finding based image processing rail way servicing apparatus and method
US9950722B2 (en) 2003-01-06 2018-04-24 General Electric Company System and method for vehicle control
US20070213926A1 (en) * 2004-04-21 2007-09-13 J. Muller Ag Method For Measuring Tracks
WO2005103385A1 (de) * 2004-04-21 2005-11-03 J. Müller AG Verfahren zur vermessung von fahrbahnen
US7469479B2 (en) 2004-04-21 2008-12-30 J. Müller AG Method for measuring tracks
US9956974B2 (en) 2004-07-23 2018-05-01 General Electric Company Vehicle consist configuration control
US10308265B2 (en) 2006-03-20 2019-06-04 Ge Global Sourcing Llc Vehicle control system and method
US9828010B2 (en) 2006-03-20 2017-11-28 General Electric Company System, method and computer software code for determining a mission plan for a powered system using signal aspect information
US9733625B2 (en) 2006-03-20 2017-08-15 General Electric Company Trip optimization system and method for a train
US9671358B2 (en) 2012-08-10 2017-06-06 General Electric Company Route examining system and method
US9702715B2 (en) 2012-10-17 2017-07-11 General Electric Company Distributed energy management system and method for a vehicle system
US8914171B2 (en) 2012-11-21 2014-12-16 General Electric Company Route examining system and method
CN104176090B (zh) * 2013-05-21 2017-02-15 中国铁建高新装备股份有限公司 基于激光开关的轨道检测仪
CN104176090A (zh) * 2013-05-21 2014-12-03 昆明中铁大型养路机械集团有限公司 基于激光开关的轨道检测仪
US9255913B2 (en) 2013-07-31 2016-02-09 General Electric Company System and method for acoustically identifying damaged sections of a route
CN103453856A (zh) * 2013-09-30 2013-12-18 湘潭电机股份有限公司 一种长距离平面或导轨的测量方法
CN103453856B (zh) * 2013-09-30 2016-01-13 湘潭电机股份有限公司 一种长距离平面或导轨的测量方法
US10597832B1 (en) 2014-05-13 2020-03-24 Laserline Mfg., Inc. Paint-striping laser guidance system and related technology
US9644331B2 (en) * 2014-05-13 2017-05-09 Laserline Mfg., Inc. Paint-striping laser guidance system and related technology
US10202726B2 (en) * 2014-05-13 2019-02-12 Laserline Mfg., Inc. Paint-striping laser guidance system and related technology
US20150330039A1 (en) * 2014-05-13 2015-11-19 Laserline Mfg., Inc. Paint-striping laser guidance system and related technology
US9689681B2 (en) 2014-08-12 2017-06-27 General Electric Company System and method for vehicle operation
US10345099B2 (en) * 2015-03-18 2019-07-09 Focus Point Solutions Reference system for track alignment machines
US20170022672A1 (en) * 2015-07-24 2017-01-26 Dutch Enginnering Llc Projector for track alignment reference systems
US10407835B2 (en) * 2015-07-24 2019-09-10 Focus Point Solutions Projector for track alignment reference systems
CN111366107A (zh) * 2020-03-16 2020-07-03 上海机电工程研究所 五轴转台轴线测量组件
CN115110355A (zh) * 2021-03-19 2022-09-27 中国核工业二三建设有限公司 一种高精度轨道调整辅助工装
CN118424236A (zh) * 2024-07-04 2024-08-02 宁波中车时代传感技术有限公司 一种基于线激光弦线的纵向水平检测装置

Also Published As

Publication number Publication date
HU171639B (hu) 1978-02-28
GB1400844A (en) 1975-07-16
DE2241366B2 (de) 1981-03-19
AT324391B (de) 1975-08-25
CA975950A (en) 1975-10-14
CH563500A5 (en, 2012) 1975-06-30
FR2155643A5 (en, 2012) 1973-05-18
NL7213543A (en, 2012) 1973-04-10
JPS5626803B2 (en, 2012) 1981-06-20
IT988566B (it) 1975-04-30
AU4721872A (en) 1974-04-04
DE2241366C3 (de) 1981-11-05
JPS4847368A (en, 2012) 1973-07-05
DE2241366A1 (de) 1973-04-19
ZA727110B (en) 1973-06-27

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