EP0064249B1 - Commande de positionnement pour aiguillages - Google Patents

Commande de positionnement pour aiguillages Download PDF

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Publication number
EP0064249B1
EP0064249B1 EP82103499A EP82103499A EP0064249B1 EP 0064249 B1 EP0064249 B1 EP 0064249B1 EP 82103499 A EP82103499 A EP 82103499A EP 82103499 A EP82103499 A EP 82103499A EP 0064249 B1 EP0064249 B1 EP 0064249B1
Authority
EP
European Patent Office
Prior art keywords
control valve
switch
piston
hydraulic
cam
Prior art date
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
Application number
EP82103499A
Other languages
German (de)
English (en)
Other versions
EP0064249A1 (fr
Inventor
Earl E. Frank
Bing S. Yee
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.)
PepsiAmericas Inc
Original Assignee
Abex Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Abex Corp filed Critical Abex Corp
Priority to AT82103499T priority Critical patent/ATE27940T1/de
Publication of EP0064249A1 publication Critical patent/EP0064249A1/fr
Application granted granted Critical
Publication of EP0064249B1 publication Critical patent/EP0064249B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
    • B61L5/04—Fluid-pressure devices for operating points or scotch-blocks
    • B61L5/045—Fluid-pressure devices for operating points or scotch-blocks using electrically controlled fluid-pressure operated driving means

Definitions

  • the invention relates to an actuator for a rail switch for switching the switches between a first and a second end position, consisting of an electric motor with only one direction of rotation, a hydraulic pump driven by this motor, a hydraulic cylinder with a piston rod, a hydraulic four-way control valve for supplying Hydraulic fluid to the cylinder for the purpose of alternately driving the piston rod from a fully retracted position in the extending and retracting directions, from a two-position rotary cam driven by the piston rod and rotatable in opposite directions by successive extension strokes of the piston rod, from a functionally connecting the rotary cam to the switch Circuit for moving the switch between each end position based on a predetermined amount of rotation of the rotary cam in one direction or the other and from reversible detection means for determining the arrival of the Switch at the second end position during an adjustment stroke of the switch and for reversing the control valve in order to retract the piston rod into its fully retracted position.
  • an electrically operated, hydraulic three-position four-way control valve is used in connection with a pressure accumulator.
  • the three-position valve has a neutral intermediate switching position, from which it has to be switched to one or the other operating position so that the aforementioned hydraulic cylinder can be acted upon with the corresponding hydraulic control fluid. It is understandable that a considerable amount of time is required for the switching of the three-position valve, which also means that a fault in the actuator can only be determined after valuable time has elapsed, with the undesirable sequel already mentioned.
  • the object of the invention is to provide a switch actuator of the type mentioned in the introduction, which operates at high speed and is constructed with simple means such that there are no lost times when the hydraulic cylinder in question is actuated.
  • the solution is based on the above-mentioned actuator and is characterized in that the four-way control valve has a first position for extending the piston rod and a second position for retracting the piston rod, that this control valve is preceded by a directional control device actuated by a solenoid that pressure-sensitive means are connected together with the detection means, which cause the actuation of the solenoid and the directional control device to immediately place the control valve in its second position, which returns the piston rod to its fully retracted position, and that immediately upon the arrival of the piston rod in its fully retracted position
  • Position responsive means are provided for deenergizing the solenoid and actuating the directional control device again to re-position the control valve in its first position, that the pressure responsive means and the directional control er recruited for reversing the hydraulic two-position four-way control valve are effective to cause the retraction of the piston rod in the event of a switch failure when reaching the second end position and failure of the changeover of the detection means, and that feedback means including electrical
  • a preferred embodiment of the actuator according to the invention is that the directional control device consists of an electrically controlled, hydraulic two-position four-way control valve which is supplied with pressure fluid by the hydraulic pump via a control line.
  • the actuator according to the invention By means of the actuator according to the invention, simple means ensure that there are no more lost times when the hydraulic cylinder in question is switched on, since the four-way control valve connecting this cylinder is already in the corresponding switching position at the start of an extension stroke of the piston rod of the hydraulic cylinder and not only in this position Switch position must be brought, and this was based on the knowledge that the end of the retracting stroke of the piston rod can be used advantageously to change the four-way control valve.
  • the directional control device is then preferably an electrically controlled, hydraulic two-position four-way control valve. Faults in the actuator can thus be determined immediately when it is actuated.
  • the proposed machine or drive is generally designated 10 in FIG. It comprises a housing 12 with a base plate, side and end walls and with a hinged cover (FIG. 2).
  • the housing forms a weatherproof and dustproof covering for the working components of the drive.
  • the rail switch (not shown) is adjusted by a hydraulic device, which includes a power cylinder, a hydraulic control valve, a pump with an electric motor and a tank for hydraulic fluid.
  • a fluid tank 14 includes a diffuser 16 in the fluid return line.
  • One or more baffle walls 18 are provided in the tank to provide a calmed fluid supply to the pump inlet line 20. This helps prevent pump cavitation.
  • a hydraulic pump 22 receives hydraulic fluid from the tank 14 via the inlet line 20. High pressure fluid exits the pump outlet line 24.
  • a check valve CV 1 located in the line is provided in the outlet line 24.
  • the pump 22 is driven by an electric motor 26 which has only one direction of rotation, the motor being connected to the base plate via a bearing base 28. Electrical energy is supplied to the motor via a motor cable 30.
  • the engine has an end bell 32 with mating openings to assist in engine cooling.
  • the pressure fluid from the pump reaches a distributor 34 by way of the outlet line 24.
  • This comprises a valve 36 for reducing the pressure.
  • This valve has connection points labeled P and T for the internal connection of a control line and an outlet line which runs to the tank 14.
  • the distributor also contains a four-way hydraulic control valve 38.
  • This valve 38 has P and T connection points for the hydraulic pressure lines and for a drain line leading to the tank.
  • the valve also includes openings labeled A and B, which are connected to pivot connections 40 A and 40 B.
  • a directional valve 42 is arranged directly above the hydraulic control valve 38. This directional valve is solenoid operated and controls the position of the hydraulic control valve 38.
  • a pair of pressure switches one switch of which is visible at PS 1, is connected to the distributor 34.
  • a fluid return line 43 provides fluid communication between the manifold 34 and the tank 14.
  • a hydraulic cylinder 44 is pivotally mounted at 46 on a bracket 48, which in turn is attached to the base plate of the housing 12. The end of the cylinder, which lies opposite the pivot point 46, slides on a bracket 50.
  • the cylinder 44 is centered by two centering arms 52, which are connected to one another by tension springs 54. The arms 52 are pivotally connected to the bracket 48 at 56.
  • the hydraulic cylinder 44 comprises an extendable piston rod 58 with a cam head 60 which is attached to the outer end of the piston rod.
  • the cylinder 44 also has two pivot connections 62 A and 62 B, respectively on its piston side and on its piston rod side.
  • the connection 62 A is connected to the swivel connection 40 A of the distributor 34 by a hydraulic pressure pipe 64 A.
  • the swivel connection 62 B is connected to the swivel connection 40 B via a hydraulic pressure line 64 B.
  • a rotary cam 66 comprises two cam pockets 68 A and 68 B, an upper, toothed shaft 70, a lower axle body 72 and a lower hub part 74 (FIG. 2).
  • the lower axle body 72 is mounted in its bearing 76, which in turn is formed on the base plate of the housing 12.
  • the lower hub part of the rotary cam is connected to a connecting rod 80 via an eye bolt 78.
  • the connecting rod is connected in a suitable manner to the switch setting rod (not shown).
  • Two position-indicating cams 82 A and 82 B are mounted on the upper shaft 70.
  • the cams are set to operate the limit switches LS 3 and LS 4.
  • the cams actuate a limit switch when the rail switch has reached one of its limit positions or end positions. Details of the construction of the cam 82 A are shown in Figure 3; the cam 82 B has the same construction.
  • the cam includes a body 84 with a central bore 86.
  • An opening 88 is provided at its end of the body part, with a mounting bolt 90 extending through the separate leg portions formed by the opening.
  • a worm drive 92 is provided, the worm protruding into the bore 86.
  • the worm thread engages in the toothing of the upper shaft 70 of the rotary cam.
  • the piston side of the cylinder 44 is supplied with a fluid pressure, whereby the piston rod 58 is caused to extend.
  • the cam head 60 engages the rotary cam 66 to cause the cylinder to pivot until the cam head is seated in the cam pocket 68A.
  • a further extension of the piston rod causes the rotary cam to rotate further counterclockwise (FIG. 1).
  • the hydraulic fluid supply is reversed so that it communicates with the piston rod side of the cylinder. This causes the piston rod to retract.
  • the centering arms 52 allow the cylinder to return to its original position.
  • the rotary cam has been pivoted so that the cam head 60 will engage the cam rod 68 B due to a subsequent extension of the piston rod and will thereby return the switch to its initial end position.
  • FIG. 4 The electrical and hydraulic circuits that control the operation of the point actuator are shown in Figures 4 to 7.
  • a 24 volt direct current source is connected to a symmetrical network as shown.
  • a hand protection switch contact is provided. These contacts are opened when a control relay is actuated, which is actuated by the manual switch device on an actuator. This prevents an injury caused by an erroneous automatic switching process during an attempted manual switch setting.
  • the network contains three main lines 100, 102 and 104.
  • the main line 100 comprises a pressure switch PS 1 and control relays CR3 and CR4 connected in parallel.
  • Line 100 also includes a push button start switch PB1.
  • a holding circuit 106 includes normally open contacts CR4.
  • a second holding circuit 108 comprises a normally open contact CR1 and a normally closed contact CR2.
  • Line 104 comprises a control relay CR2, contacts M2 and CR4 connected in parallel and a pressure switch PS2.
  • Line 104 includes a normally open limit switch LS3 and a normally closed limit switch LS4.
  • Line 104 also has contacts CR1 and M1 connected in parallel and a control relay CR1.
  • Red, green and yellow indicator lights are connected to line 104 as shown. These indicator lights can be located at a remote location, e.g. in a signal tower. The red light is switched on via line 110, the green light via line 112 and the yellow light via line 114.
  • the circuits for the motor and the motor starter are shown in FIG. 6.
  • the motor is suitable for 220 volt operation with three-phase current at 60 hertz.
  • the engine 26 may have an output of 3 horsepower and operate at a speed in a range from 1425 to 1725 revolutions per minute.
  • the motor comprises a contactor 116 with overload protection devices, which are designated OL and with the motor contacts M.
  • the electrical energy is supplied via the lines L1, L2 and L3.
  • Line 118 includes a motor control signal M, overload protection contacts OL and a contact CR2.
  • Line 120 comprises contacts M3 and CR3 connected in parallel, these in series with a normally closed contact CR3 and with a solenoid SOL. Both lines 118 and 120 are connected to the point L3 via an on-off switch, the switch being part of the push-button switch PB1.
  • the hydraulic circuit is shown in Figure 7. This is a schematic representation of those parts which have been shown and described above in connection with FIGS. 1 and 2. The same reference numbers are therefore used for the same parts.
  • the internal connections of the manifold 34 include a hydraulic pressure line 122 that directs pressure fluid from the pump outlet line 24 to the hydraulic control valve 38.
  • a drain line 124 which includes a check valve CV2, connects the control valve 38 to the tank return line 43.
  • the breakdown valve 36 is to be provided between the lines 122 and 124 to prevent damage to the system in the event of a misconstruction.
  • the hydraulic control valve 38 is a four-way, two-position valve.
  • the normal working position is designated 1 and shown in Figure 7.
  • the reverse position is designated by 2.
  • Valve 38 is adjusted between positions 1 and 2 by the control pressure in lines 126 and 128. The pressure in these lines is in turn controlled by the directional valve 42.
  • This directional valve is shown in its normal working position 1 and is moved into its reverse position 2 by the solenoid SOL.
  • the control pressure is supplied via line 130 and removed from pressure line 122.
  • a tank or drain line 132 connects the outlet of the directional valve 42 to the tank 14.
  • the hydraulic valve 38 is connected to the cylinder bores 64A and 64B via the lines 134 and 136. Pressure switches PS1 and PS2 communicate with lines 134 and 136, respectively.
  • the switch actuator functions as follows:
  • the drawings show the switch actuator and the control circuits in their normal working position.
  • the rail switch In this state, the rail switch is in the open position, with the limit switch LS3 normally open and the limit switch LS4 normally closed.
  • the motor 26 is switched off and the pressure switches PS1 and PS2 are closed.
  • the green indicator light is switched on via lines 104 and 112.
  • each part is ready for the next switching operation.
  • the hydraulic control valve 38 in position 1 will immediately deliver pressurized fluid via lines 134 and 64A to the piston side of the cylinder 44. No displacement of the valve control members or the valve slide or the like. Or other time-consuming activities are necessary to prepare the actuator for a switch operation. This increases the speed of the point actuator, thereby reducing the time required for an actuating process.
  • a course setting is initiated by pressing the start button PB1 (or the remote start button). This connects the 220 volt source to points L2 and L3 in Figure 5 and energizes control relays CR3 and CR4. Contacts CR4 on line 106 close to hold the circuit via line 100. Contacts CR4 on line 102 also close and energize control relay CR2. As a result of the excitation of the relay CR3, the contacts CR3 in line 120 (FIG. 5) close and open accordingly. When relay CR2 is energized via line 102 and contact CR3, the normally closed contacts CR2 in holding circuit 108 open and the contacts in line 118 close. This last process energizes the relay M by closing the contacts M ( Figure 6), whereby the motor 26 is started.
  • the actuating cam 82A turns off the limit switch LS3, thereby changing the state of LS3 to a closed position.
  • the green indicator light is thereby switched off and the red indicator light is switched on via line 110.
  • the red indicator light informs the control personnel that the rail switch is in an open position.
  • Closing LS3 also energizes relay CR1 via line 104 and contacts M1. This closes the contacts CR1 in both the line 104 and the holding circuit 108.
  • the cam 82B brings the switch LS4 into an open position. This de-energizes the relay CR1 and again opens the contacts CR1 in the line 104 and in the holding circuit 108.
  • the changed position of LS4 switches off the red indicator light and switches on the yellow indicator light via line 114. This yellow light informs the control personnel that the turnout is in the turn out position.
  • the actuator is now in the state for a change from the curve position to the open position. This is basically achieved by the same extension and retraction sequence as described above, with the exception that the limit switch LS4 is only moved from the open position to the closed position (which turns the yellow indicator light off and the red indicator light on) and that the limit switch LS3 is then moved from the closed position to the open position when the through position is reached (and then the red indicator light goes out and the green indicator light comes on).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Switches With Compound Operations (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Actuator (AREA)
  • Push-Button Switches (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)
  • Earth Drilling (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Finger-Pressure Massage (AREA)
  • Hydraulic Turbines (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Claims (3)

1. Système de commande de positionnement, pour un aiguillage pour manoeuvrer l'aiguille entre une première et une seconde positions d'extrémité, constitué par un moteur électrique (26) tournant dans un seul sens de rotation, une pompe hydraulique (22) entraînée par ce moteur, un vérin hydraulique (44) comportant une tige de piston (58), une soupape hydraulique de commande à quatre voies (38) servant à amener le fluide hydraulique au vérin en vue d'entraîner d'une manière alternée la tige de piston depuis une position totalement rétractée, dans la direction de déploiement et dans la direction de retrait, par une came pivotante à deux positions (66), mue par la tige de piston et pouvant être entraînée en rotation dans des sens opposés sous l'effet de courses successives de déploiement de la tige de piston, par un circuit reliant la came pivotante à l'aiguille selon une liaison active de manière à déplacer l'aiguille entre les deux positions d'extrémité sur la base d'un angle prédéterminé de rotation de la came pivotante dans un sens ou dans l'autre, et par des moyens de détection réversibles (LS3, LS4) servant à déterminer l'arrivée de l'aiguille dans la seconde position d'extrémité pendant une course de manoeuvre de l'aiguille et à inverser la commande de la soupape de commande (38) en vue de ramener la tige de piston dans sa position totalement rétractée, caractérisé en ce que la soupape de commande à quatre voies est constituée par une soupape de commande à quatre voies et à deux positions (38) possédant une première position (1) pour le déploiement de la tige de piston et une seconde position (2) pour le retrait de la tige de piston, en ce qu'un dispositif de commande directionnelle (42) actionné par un solénoïde (SOL) est branché en amont de cette soupape de commande (38) de manière à réaliser l'inversion de la commande, en ce qu'aux moyens de détection sont interconnectés des moyens (PS1) répondant à une pression et qui provoquent l'actionnement du solénoïde (SOL) et du dispositif de commande directionnelle (42) de manière à positionner immédiatement la soupape de commande (38) dans sa seconde position (2) provoquant le retour de la tige de piston dans sa position totalement rétractée, en ce qu'il est prévu des moyens (PS2), qui répondent à une pression aussitôt que la tige de piston arrive dans sa position totalement rétractée et qui servent à désexciter le solénoïde (SOL) et à actionner à nouveau le dispositif de commande directionnelle (42) en vue de ramener la soupape de commande (38) dans sa première position (1), en ce que les moyens (PS1) répondant à une pression et le dispositif de commande directionnelle (42) agissent de manière à inverser la commande de la soupape hydraulique de commande à quatre voies et à deux positions (38) pour déclencher le retrait de la tige de piston dans le cas d'une perturbation gênant l'aiguille lorsque la seconde position d'extrémité est atteinte et lors de la défaillance de l'inversion de la commande des moyens de détection (LS3, LS4) et en ce qu'il est prévu des moyens de rétroaction y compris des circuits électriques de maintien (104, 108) pour déclencher un second cycle du vérin (44) afin de réaliser le redéploiement de la tige de piston et le rappel de l'aiguille dans la première position d'extrémité dans le cas de son impossibilité à atteindre la seconde position d'extrémité en raison d'une perturbation.
2. Système de commande de positionnement selon la revendication 1, caractérisé en ce que le dispositif de commande directionnelle (42) est constitué par une soupape hydraulique de commande à quatre voies et à deux positions, à commande électrique, qui est alimentée par un fluide sous pression envoyé par la pompe hydraulique (22) par l'intermédiaire d'une canalisation de commande (130).
3. Système de commande de positionnement selon la revendication 1, caractérisé en ce que les moyens de détection incluent au moins un interrupteur de fin de course (LS 3, LS 4) et une came de positionnement (82 A, B) associée à cet interrupteur de fin de course et en ce que la came de positionnement est fixée sur la came pivotante (66).
EP82103499A 1981-05-04 1982-04-24 Commande de positionnement pour aiguillages Expired EP0064249B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82103499T ATE27940T1 (de) 1981-05-04 1982-04-24 Stellantrieb fuer schienenweichen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US260110 1981-05-04
US06/260,110 US4428552A (en) 1981-05-04 1981-05-04 Railroad switch machine

Publications (2)

Publication Number Publication Date
EP0064249A1 EP0064249A1 (fr) 1982-11-10
EP0064249B1 true EP0064249B1 (fr) 1987-06-24

Family

ID=22987809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82103499A Expired EP0064249B1 (fr) 1981-05-04 1982-04-24 Commande de positionnement pour aiguillages

Country Status (10)

Country Link
US (1) US4428552A (fr)
EP (1) EP0064249B1 (fr)
JP (1) JPS57191161A (fr)
AT (1) ATE27940T1 (fr)
AU (1) AU528711B2 (fr)
BR (1) BR8202531A (fr)
CA (1) CA1176743A (fr)
DE (1) DE3276630D1 (fr)
ES (1) ES8303210A1 (fr)
ZA (1) ZA821166B (fr)

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US4970965A (en) * 1988-06-27 1990-11-20 Aeg Westinghouse Transportation Systems, Inc. Safety locking structure for a rotary guideway switch
US4970966A (en) * 1988-06-27 1990-11-20 Aeg Westinghouse Transportation Systems, Inc Self-aligning rotary guideway switch
US4970967A (en) * 1988-06-27 1990-11-20 Aeg Westinghouse Transportation Systems, Inc. Rotary guideway switch for people mover systems
US4970964A (en) * 1988-06-27 1990-11-20 Aeg Westinghouse Transportation Systems, Inc. Single turnout rotary guideway switch and a dual lane crossover station employing the same
US5020441A (en) * 1988-06-27 1991-06-04 Aeg Westinghouse Transportation Systems, Inc. Electric coupling for rotary guideway switch
US5012747A (en) * 1988-06-27 1991-05-07 Aeg Westinghouse Transportation Systems, Inc. Rotary guideway switch having guidebeam and/or electric rail structure located above and between guideway tire paths
US4970962A (en) * 1988-06-27 1990-11-20 Aeg Westinghouse Transportation Systems, Inc. Double turnout rotary guideway switch
US4969400A (en) * 1988-06-27 1990-11-13 Aeg Westinghouse Transportation Systems, Inc. Electric, guidance and tire path configuration for a people mover guideway
US4970963A (en) * 1988-06-27 1990-11-20 Aeg Westinghouse Transportation Systems, Inc. Rotary guideway switch having single tire path loading
US5020442A (en) * 1988-06-27 1991-06-04 Aeg Westinghouse Transportation Systems, Inc. Guideway station for a rotary guideway switch
IT1242226B (it) * 1990-10-10 1994-03-03 Sasib Spa Dispositivo di manovra per deviatoi ferroviari, in particolare per linee ad alta velocita'
AT397790B (de) * 1991-01-16 1994-06-27 Alcatel Austria Ag Hydraulikeinheit
SI9300651A (en) * 1992-12-17 1994-06-30 Voest Alpine Eisenbahnsysteme Device for bolding movable parts of railway switches
US5531408A (en) * 1993-10-07 1996-07-02 Chemetron-Railway Products, Inc. Railroad switch stand
GB9524541D0 (en) * 1995-11-30 1996-01-31 Westinghouse Brake & Signal Point drive unit
DE19545784A1 (de) * 1995-12-08 1997-06-12 Sel Alcatel Ag Vorrichtung zur gleichzeitigen Kraftausübung mittels hydraulisch hintereinandergeschalteter hydraulisch er Stelleinheiten
US5775647A (en) * 1997-01-31 1998-07-07 Wyatt; Michael L. Hydraulic switch stand
US5772157A (en) * 1997-02-07 1998-06-30 Fluid Energy Controls, Inc. Operating railroad switches
DE19901567A1 (de) * 1999-01-16 2000-07-27 Alcatel Sa Weichenantrieb
US6427950B1 (en) 1999-06-04 2002-08-06 Meridian Rail Information Systems Corp. Electrically operated railroad switch machine
US20080251649A1 (en) * 2007-04-10 2008-10-16 Justin Salmans Railway Switching System
US20120124989A1 (en) * 2010-11-24 2012-05-24 Doll Robert A Hydraulic Power Unit With Auto-Load Sensing
US9242661B2 (en) * 2013-05-24 2016-01-26 Spx International Limited Railway point crank system
IT201700059882A1 (it) * 2017-05-31 2018-12-01 Silsud Cassa di manovra di un deviatoio ferroviario e sistema di movimentazione degli aghi in un deviatoio ferroviario che adotta tale cassa di manovra
EP3564089B1 (fr) * 2018-05-02 2022-08-31 Alstom Ferroviaria S.P.A. Unité de commande oléohydraulique pour la commande des commutateurs de chemin de fer et procédé pour effectuer un contrôle de sécurité sur cette unité de commande oléohydraulique
WO2023059314A1 (fr) * 2021-10-04 2023-04-13 BEAMAN, Mona Dispositif d'aiguillage de voie ferrée permettant de déplacer des points d'aiguillage de voie ferrée

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US3158345A (en) * 1961-09-19 1964-11-24 American Brake Shoe Co Railway switch actuating mechanism
US3363097A (en) * 1965-05-10 1968-01-09 Abex Corp Railway switch mechanism

Also Published As

Publication number Publication date
BR8202531A (pt) 1983-04-19
ZA821166B (en) 1983-01-26
AU528711B2 (en) 1983-05-12
US4428552A (en) 1984-01-31
CA1176743A (fr) 1984-10-23
JPS57191161A (en) 1982-11-24
EP0064249A1 (fr) 1982-11-10
ES510377A0 (es) 1983-02-01
AU8074182A (en) 1982-11-11
ES8303210A1 (es) 1983-02-01
DE3276630D1 (en) 1987-07-30
ATE27940T1 (de) 1987-07-15

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