FR2632259A1 - AUTOMATIC TRANSPORTATION SYSTEM WITH AXIAL MOTORS - Google Patents

Abstract

The invention comprises an active electric track capable of receiving and propelling the trainsets of a public transport system. The beams 1 fixed by the gussets 2 on the sleepers 3 of the posts 4 carry the rails 5 with the interposition of the rubber blocks 6 held by the shells 7 and 8, the latter integral with the sleepers 9 which carry the floor 10. The sleepers 11 carry the switchgear boxes 12 surmounted by the motors 13 themselves supplied by the connections 14 to the power cables 15. The boxes 12 also carry the proximity detectors 16 and the emergency brakes which cause the lining pads to rub on the armatures friction 17. The trainsets have bogies on which the armatures are located and cabins whose doors control the automation.

Description

I. INSTALLATION l) TRANSPORT AIUTOMATIQIJE A MOTEURUIJRS AXIAIJX On

  is already known linear electric motors, said "mo) teiur axiautix", which have been described in particular in French patents No. 70 31 994 and 80 27 953 of

  applicant. (Batchers shall, on the one hand, have an armature in or in Ornéga,

  on the other hand an inductor which we will call "motor" and which is (constituted by a winding made in bobiitnes re ('tangulaires dlsposefes one (s to the stuite of (-)

  others around the core of the community, with the inclusion of additional resources.

  water borne by a coniductri coniductri e plate of the island (tricity loruif eérdan

  to the magnetic media.

  It is also known, especially by patent 70 31 994 mentally delimited, the possibility of staggering axidux noteers between the rails of a system of transport to (-stitute an "active track éle (trique". A certain number of these imoters hastened the ranies, and along the way, if

  is needed, other users maintain the vitese; finally, at the entrance of the

  In this case, the motors, which may be of the standard type, provide railing and clamping by means of a trellising function obtained, either by direct current injection or by inversion of the direction of the chiller. If the path is unique, and if we designate the sucessive staptiols by 1, 2, 3 ..., ul 'padrilt (.eb, iiotursi uiIlll,'

  for the launch of, for example, station 1 to station 2 station Istaltnti

  there are two of the commodities that arrive in I. (These loteurs who

  In this way they will be able to use motors, brakes, and brake motors. The raines slow down on their way when they arrive

  stations, fewer brakemen are needed than there are nimotors: the proportion

  saire is often close to the mloitiée.

  The installation thus carried out is particularly economical in that the axial motors have a price / price ratio so lavable that, despite their high number, due to the considerable lightening of the speeds allowed by the simnplicity of the embedded hardware the ensermble of the niotorization is a lot less

  expensive than with the traditional solution.

  We can go further in the direction of the economy by foreseeing Ure, itstal-

  single-track latlon, that is to say a single installation where the stations are only reused by a single lane and the lines intersect, either in all sta tions, or only in a small number of places . On the installations of the island, econolilie is important because, for reasons of safety, we are obliged to raise the road and we can lighten the structures if we have only one With traditional systems, single-channel instantiations are considered rather small because they are due to a human error that causes two ramins to be sent in reverse direction on a single path.

2-632259

  n,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, (d) In Olulltrai, you will find yourself in the position where you are in the right place and where you are, and where you can go. This is done by means of the provisions, followed by the use which makes use of the infrastructure which is fixed in place, and which serves as a means of ensuring that the institutions are in a better position.

  and those that are immensely employed by the trainers do not result in more difficulties.

  According to the invention u ') the first security is provided by a device which prohibits any start of a raime in a crossing station as long as Id

  which has to come across the target is not present in the table.

  To see the safety of this safety, let us denote by 1-2, 2-3 the sections that restore stations 1 and 2 on the one hand, and 2 and 3 on the other. 51 a line I which starts from the stdtiior I oistist that the rait R 'in the proviidaclt of the stdtioln 2 has arrived, celd igililie that the section 1-2 is released: the field R "which Follows IRt' in the same meaning did not in I could not leave station 2 since R was there

not arrived.

  A safety precaution is provided by the fact that a section of an electric power channel, all of whose motors are powered by a single line, can be powered only in one direction or the other and not in both at once: In order to change this direction, two phases must be performed: According to the invention, this property is used to compensate for a possible deleteriousness of the previous system:

  of a section, such as (1-2) of which are indicated by the line and their brln-

  the line is such that they exert thrusts in the direction 1-2 except that the line is fed by the station I, in the direction 21 when it is diliilentee by the station 2. According to the invention, ("is the order of launching a rift from a given station and on a given trolcorn that conmiiancl the nise .s energized engines of this section from the station. In these conditions if tiii order of launching is given then that a ranie is already launched in the other direction on the same section, the line is fed in two ways with, from one to the other,

  permutation of two phases, and a short circuit occurs which forbids the

they are uncomfortable.

  It is possible to imagine incidents that provoke ilien-

  some contactors. According to the invention, new safety conditions are created by performing additional locking at the level of the bearings of the last coils: two power supply lines are provided for these coils, one for the co-operators who ensure the start of I to 2 and the stop

  in 2, the other for those who provide the reverse maneuvers. Following the

  tion, the feeding system of these lines forbids their diet! and the fact that the switch from one to the other can only be carried out

  o a rail arrives in one of the two stations concerned.

  The most expensive parts of an elevated line are the spans that sup-

  wear the tracks. According to the invention, they are constituted by simulations

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  the third and third countries. south he r r. troughs of ptul (, tlx.

  The extrusions of the overflowers which carry the floor and the base of the floor shall be the same as the rest of the floor where the beams shall be stretched.

  posed no transforiilatlioli.

  The need to maintain a small air gap between the armature and the inductor of axial motors is to prevent a primary suspension between the axles and the chassis of the cars. blocks

  Elastics (for example, in the context of the difference between the selections of the rdilk and the dil-

  of the beams. The moteulrs are made integral with the sleepers which bring together the railways so that the elastic blocks can have a smile under the clutches.

  It is noticeable that this misses the precision of the air gap.

  The easiest point for self-contained installdill ons is digs.

  It is known how to solve it - by using a lot of wheels in some of the wheels.

  It has one xboudin of each one of the banldge, while the other has none.

  This system is frequently used on two-rowed funiculars and, in this case, is guided by one of the two roads of Id Way. While the tramps in general usually have more than two lines, it is necessary to provide At the end of the line, according to the invention, this possibility is offered by arranging the motors and the armatures in such a way that they are one and the other a plain of vertical symmetry confused with that which It is clear that, in these circumstances, a return to it is necessary.

  not the relative positioln of the inducers and mnoteurs.

  In order for the return loops to have a moderate encombreration, the units must be able to accept curves at a small radius. Traditionally or

  obtains this result by having the cars supported by bogies with

  ment. In the particular case of the invention, however, that provision is dili-

  the cormpatible with the presence of the armature that is between the rou-es stiur the entire length of the vehicle. According to the invention, this problem is solved by adopting

  the general design of a four-lane chassis and to make it more

  it consists of a set of two wheels arranged one after the other, and suspended

  able to rotate around its axis of symmetry. The seths located on the side where the wheels have two rolls are guided by these rolls and those which are sittués

  on the opposite side are pivotally secured by bars which

positive support.

  With the traditional assembly, the wheels of the axles are connected by means

  and the armature of vehicles must pedes from below these trees. According to linveintioln, the deletion of the stele is releted to restore the armature of the desired level so that it alone constitutes the longitudinal structure of the chassis of the vehicle: the crosspieces at the extremities of which the sets of two wheels pivot c: onçus

  according to the invention are directly attached thereto.

  The principle of axial motors leads to their elongation in the direction of their axis of symmetry and when they are arranged so that their plane of symmetry coincides with the plane of symmetry of the channel, their elongation is in the vertical direction, so that their support-screen is horizontal. According to the invention, this arrangement is used to make the mounting very economical: the screen support is given the shape of a plate (this is one of the principles of the Omega arrangement) and serves as cover to the control box. The coil connections have only the cover to cross to get into the control box o they go directly to the terminals of the desired contactor. In addition, the sides of the control box can serve as radiators to the engine; for this purpose, on the inner side, they comprise a horizontal part which is tightly pressed against the underside of the support-screen so as to ensure a good thermal contact with the latter and, on the external side,

  they have cooling fins.

  According to the invention, the automatic operation is based on the locking device of the doors: they roll on rails in the usual way

  and their locking system consists of a bar which abuts on a roller.

  The latter may fade but, to do this, it must cross a boss. He pushes

  therefore the door a little beyond its normal closing position (tightening

  only the door against its amount, or the doors against each other if the door

  is double) so that, once released, it takes a momentum and opens spontaneously

  temporarily, thus causing an automatic opening start. The door

  is closed by a counterweight that slides into a tube full of oil, and a system

  The system consists of a valve that makes the movement cushioned in the direction of descent (the door closes gently), free in the climb (the door can be opened quickly). Once the door is closed, the roller returns

  against the boss but does not cross it, so that re-locking does not occur

not spontaneously.

  Unlocking and relocking maneuvers are caused from the outside.

  in the cabin thanks to a U-shaped bar placed all along the platform and in which rolls a second roller solidarity with the one of which it has just been mentioned. This U-bar can be pushed or pulled by electromagnets. In both cases, it pushes the boss to the stopper roller, thus causing the lock

  in one case, the unlocking in the other.

  According to the invention, the U-bar controls all the automation thanks to

  switches distributed along the platform and which detect its changes of position.

  As a first step, they note the possible opening of a door and

  say the start while, in a second time, they note the closing of all the doors and cause the lock. A programmable automaton,

  or any other equivalent system, orchestrate the sequence and introduce the temporalities

  In particular, according to the invention, it switches the motors on

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  fraction by using the fact that instead of being provided with a terminal board and being connected by three wires, the motors have all the connections of

  their coils out through the plate that separates them from their control box.

  The motor force as well as the braking force must be adapted to the load.

  age of vehicles. According to the invention, this result is obtained by weighing each train before it is launched (the track section which received the train rests either on elastic studs or on strain gauge sensors) and the result is made of this operation is translated as a value voltage

  wanted to be sent to the relevant engines and brake motors.

  The device which has just been described is always precise enough for the acceleration

  which can without any disadvantage vary between relatively wide limits, but not for braking, since the positioning at the stop must be precise to the nearest meter otherwise, on the one hand it is necessary to lengthen the quay, on the other hand it complicates the problem of rebooting. According to the invention, the last brake motors (for example the last four) which perform braking, are provided with a controller responsive to the travel time between two points: for example between the proximity switch of the engine-brake concerned and that of the previous one. The automaton determines the fraction of the winding that must be put into play by braking. A stop brake which raises the front of the armature of the first vehicle and which is retracted by an electromagnet at the time of starting acts as safety if a

  incident makes the braking insufficient, for example to lift the train of some-

  millimeters as soon as it tends to exceed its normal stopping position.

  According to the invention, it is remedied separately to a malfunction of each of the brake motors that intervene for braking by arranging in its control box a system which, in case of lack of tension on the

  braking control contactors, provides a proportional braking

  the weight of the train. For this purpose, there is an electromagnet which is powered under this voltage and which opposes the upward thrust of an elastic system capable of rubbing on the armatures a pad of padding.

  friction. It is the value of the coefficient of friction which makes it possible to adjust the decay

leration to the desired value.

  With an installation according to the invention, a power failure occurring

  during a launch immobilizes the train, either close to the station of de-

  if the failure occurs before it leaves the area where there are

  brakes (the emergency brake of the latter intervenes in effect for the

  biliser), or, in the opposite case, to. next to the arrival station: it is then the emergency brakes of the brake motors located near the latter which intervene. According to the invention, this risk is remedied by providing, either in each station, or at a rate of one for several stations, an asynchronous motor which rotates continuously by driving a flywheel. It is an asynchronous motor wound rotor and, in case of lack of voltage, without disconnecting the -6- network, is injected into its rotor a DC current obtained, partly from

  of a storage battery, partly by rectification of a proportional voltage

  the current provided, so that there is no excessive voltage drop at the time when the system debits the engines to complete a launch: the supply of power only lasts a few seconds and, for reason of economy, it is necessary to have the motor running as a generator supply a power so much greater than its nominal power that, if we did not take

  precautions, the tension would fall to almost nothing.

  A train may be blocked, either because the device just described malfunctioned, or because a tree branch fell on the track, a truck skewed a post and twisted a beam ... It is therefore

  careful to plan an emergency evacuation. But it must not be possible to use

  only if it is certain that the train is definitely immobilized.

  For this purpose, a bar is provided across each escape door (at the front and at the rear of the train), the maneuver of which causes the corresponding vehicle to be lifted by means of a transmission by rods and screws. cylinders mounted on balls which lower a pad under the pivot axis of each pair of wheels of the vehicle. The result is an uprising of the latter and

  therefore a braking proportional to its weight; if the train is long,

  put the movement on one or more other vehicles for sufficient braking: thanks to the ball screws the effort to provide is not exaggerated. Two cams that mesh one into the other ensure that, as soon as we have completely turned the bar, we can open the door and that as soon as we started to open

the door, we block the bar.

  Finally, it is necessary to foresee an incident at the time of the ascent or descent of the travelers, one of them having for example a garment stuck in a door

  without, however, resulting in a prohibition of locking and starting.

  According to the invention, to reduce the risk of accidents, there is provided on each door an alarm signal that can intervene only if the train has not yet left the station (otherwise the danger would be, not removed, but on the contrary increased) and which, in this case, unlocks the door, thus provoking, by the game of automatism

  described, the immediate power off of the launch engines as well as the

emergency brakes.

  The following will be designated by way of non-limiting example, various forms of

  embodiment of the invention with reference to the accompanying drawings in which

  Figure I shows a section of track according to the invention.

  FIG. 2 represents a perspective view of the chassis of a vehicle

according to the invention.

  FIG. 3 represents a perspective view of the control system

tomatic according to the invention.

  FIG. 4 represents a perspective view of a brake motor according to the invention.

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  Figure I shows a section of track according to the invention. The beams 1 are held tight by the gussets 2 on the sleepers 3 which themselves

  rest on the posts 4. The rails 5 rest on the lower wings of the truss.

  the I by means of rubber blocks 6 sandwiched between upper shells 7 connected to the rails and lower shells 8 connected to the raised sleepers 9 which carry the circulation grating 10 and which are themselves held by clamping on the lower flange of the beams I. The rails are maintained at the desired spacing by the tubular crosspieces

  to which the equipment boxes 12 carrying the motors 13

  placed exactly in the middle of the path. The connections 14 pass through the

  its tubulars 11 and will join the cables 15 running between the rails 5 and the flanges of the beams 1. On the sides of the screens of the motors 13, there are the proximity sensors 16 and, optionally, the pellets 17 normally retracted towards the bottom of the emergency brakes automatically put in

  if the braking is faulty.

  Figure 2 shows the chassis of a vehicle. The armature 21 coated with its inner conductive layer 22 receives the tubular crosspieces 23, the ends of which bear the plates 24 which in turn receive the bearings 25 and 26 in which the assemblies each constituted by two plates 27 and a pair of wheels 28 pivot. and 28a. From one side to the other, these sets are secured by the connecting bars 29. The elastic suspension systems 30 placed between the plates 24 support the box (not shown). The anti-roll bars 31 mounted in the yokes 32 fixed on the plates 24 are connected to the body by the arms 33. The levers 34 controlled by the emergency doors of the cabin attack the rods

  Threaded 35 and down on the rails immobilization shoes 36.

  Figure 3 shows the platform and the cabin seen from above assuming removed the floor of the latter. The door 40 carries the bar 41 which is provided with a boss 42 and which abuts on the roller 43 itself placed at the end of a lever 44 whose other end receives a second roller 45 which rolls in a U 46 integral with the station and moved laterally to the right by the electromagnets 47, left by the electromagnets 48. In moving, this bar 46 forces the roller 43

  to cross the boss 42 and unlocks the door, thus opening it.

  This operation pushes the roller 43 to the right and the roller 44 and the U-shaped bar 46 to the left. The switches 49 note the opening of the doors and prohibit starting. Subsequently, when they stop to notice the opening of the doors they control the locking and, by noting that this operation took place,

  the switches 50 give the starting order.

  Figure 4 shows the sectional view of a brake motor placed on its control box. The brake motor 51 rests on its support-screen 52 itself placed on the equipment box whose flanks 53 form radiators, the part

  horizontal coming to ensure good thermal contact with the support-screen 52.

  The piton 55 covered with the generation of lion 56 tends to go back to tlrdv.r, support-ecirdii) 2, or Id potuné dv. round, it is held by electromagnet 58 which does not have it. than in the case of a normal brake application. There is a non-represented semi-differential flow dil.% That a proximity sensor 59 and, on both sides of this ensemnble, we find the contactors, comlanandte 60 and 61 whose u.n% ert of training and the other to the loneliness in Irein as well as, in

fu'ibles 62.

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R EVENI) I (CATIONS

  (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (b) (b) (b) (b) (b) (b) (b) the milk that it is co-manufactured.

  in whole or in part of the elections, has been against the Elections of

  It is prohibited by prohibiting the dispatch of a cruise control system while the opposite route on the other lane of the station is not present on any route. 2 - Transportation facility according to claim I cedacterized in that qlu, all the engines utinimme mime tronton delimited by Sidtiori, crossing weis designated by A and B are daliin'tnt by a 'mime line, their branc'lhementi being

  as they are exercised in the direction AB when that ligni is alinelited-

  in A, in the direction BA Iorsqu'ellet is alimienitée in B.

  3 - transport installation according to any one of claims I and 2,

  characterized in that the coils of the contactors of the motors of a neireie section AB are fed by two lines: one which assures the laInceiement by ls lursurs

  A neighbors and braking by those who are neighbors of B and vice versa, the passage-

  the alinmeitation of one to that of the other is made when a train arrives at A or B.

  4 - transport instialldtioni according to any one of claims I to 3 ca-

  in that the pumpiras I qml suipporteit the rails 5 SOililelli'it encircled at their inner part by the devices tixation on the crosses 3

  potedux 4 and by those who fix the crosspieces 9 of the circus plank.

I10.

  Transport installation according to one of claims 1 to 4,

  characterized in that the rails 5 rest on the lower flanges of the beams I by means of rubber blocks 6, the motors 13 being made soliddires

  crosspieces which join the rails 5.

  6 - Transport instdilation according to any one of claims I to 5

  characterized in that the wheels 8 and 8a which are located on one side of the voittires have two flanges, while those which are located on the other have none, one oar out of two having all its flanges on one side and the other having them on the other,

  the switches being fixed.according to the technique commonly used for lunar

  the lines being joined at each end of an overturning loop, and the niotors as well as the indutts having a vertical axis of merging vertical

with that of the way.

  7 - A transport installation sutivdnt any of the revendicatllons i to 6 characterized in that, on each side of each axle, to 1'ilieliient the wheel usual, there are two wheels' 8 and 8a available one behind the other and whose set can pivot around its vertical axis of sylety by being guided where 2632259 is by. the wheels of the wheels, either for the side which is deprived by a bar

  which solidarises the pivoting movements of the pairs of wheels on both sides.

  8 - Transport installation according to any one of claims I to 7 and

  wheels replaced by sets of two wheels which are arranged one behind the

  the other and which pivot about their axis of symmetry, characterized in that the cross members 23 which bear the bearings 25 and 26 necessary to ensure this

  pivoting are attached to the armature.

  9 - Transport installation according to any one of claims 1 to 8,

  characterized in that the plates 52 which constitute the screen supports of the

  They are used as covers for their control boxes, the connections of the coils going through these plates to reach directly the terminals of the

contactors 60 and 61.

  - Transport installation according to claim 9, characterized in that the flanks of the control boxes serve as radiators for the motors, horizontal parts forming a thermal contact with the lower faces

  plates 52 which constitute the screen supports of the latter.

  1 l - Transport installation according to any one of claims I to 10,

  characterized in that the gates control the automatic behavior of the station. For this purpose a bar 41 which is integral abuts against a roller 43. which can be cleared by means of a lever 44 itself controlled by a second roller 45, equel rolls in a U-shaped bar 46 placed along each platform and that electromagnets 47 and 48 can move in order to act on

the roller 43 blocking the door.

  12 - Transport installation according to claim 1 1, characterized in that the end of the bar 41 which stops the door 40 in closed position against the roller

  43 includes a small boss 42 that this roller must cross to ensure the release

  rust, thus energetically tighten the door 40 against its amount or, if the door is double, coming to tighten the doors against each other, and causing a beginning of automatic opening movement when the roller comes from

to cross it.

  13 - Transport installation according to any one of claims 1 to 12

  and provided with a control system by the gates of the behavior in station,

  characterized in that each door has a counterweight which makes it

  only when the travelers have stopped crossing it, this counterweight being

  cushioned downhill so that the closure is not abrupt.

  14 - Transport installation according to any one of claims I to 13

  and provided with a control system by the gates of the behavior in station,

  characterized in that the position of the U-bar 46 which detects the opening condition

  closing or closing of the doors adjusts the sequence of the automatic

  starting with switches 49 and 50 actuated by its movements.

I IÀ

  Of course, this is the case, and it is the title of the epidemic report.

  it will be there. ldl (lahd (qul. ', lau'> unll Jl t (% wllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll

  all of them are ready to play, and they are ready to play the role of any other equivalent system to orchestrate the sequence and introduce the desired models.

  1 5 - the insertion of trnslnspl) orl dsling the one qtttl (: oinqute of revenc (liut said oi, I to 14.

  cardcterized in that the self-sufficiency sys-

  support fraction fraction fraction or the toiftiurs whichlffaituitti this operation.

  16 - transport facility following the tune any of the claims I 'to 5 characterized in that the tlort mitteur is ddal) tec the clhdrg- vét; Il-ï thanks to a device that weighs the rdite dvat every day starts and is added to Id value

  found the tellnsion sent uir all. who are reaffirming the lanceimelt (onsl-

  dere, as well as the braking that follows.

  17 - Installation of transporl following any of the resolders I to 16.

  characterized in that the accuracy of the stopping position is improved by subdividing several of the chucking windings of some of the last motors which provide the reindeer, and the free winding of the reels under ten, where determined by a time-sensitive electromechanical system which had passed between the instants where the reamer actuated two proximity detectors.

  one (distallce the titn on the other.

  18 - the tranlsport sulivan llllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll

  Characterized by the fact that, read! al) returns the stopping position, *. find pIli-

  brakes pushed up, the high palt, elastic sytems and old

  to raise the height of a few miles, as soon as it tends to become a normal stop, causing a deceleration which depends very little on the load of the role, and this dispoltil being abdicated by an electrodiallity of the planet.

  from redeploying to the last authorization.

  19 - transtport installation according to any one of claims 1 to 18,

  characterized by the milk that the slack stopper, which is operated by one or more systems similar to that of the invention, of claim 18, the coefficient of friction of the brake lining (s) being selected in the same manner such that the deceleration is sensibly similar to the same as if the operation was normal, and the electro-functional, which prevents its function, being fed by the source niine that the system

  which ensures the unction of the engine.

  Transport installation according to any one of claims I to 19

  it is equipped with a system for securing vehicles in the event of a defect in the operation of the inotetires-freis, and in that the device which raises the cars when a defect occurs is placed in the position of the driver. the inside of the trunk neck of the latter, the thrusting plate pushed up to the hdut by the

  Eladstic system coming through the support-eccuei that caps this box.

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  21 - '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' ('' '' '' '' '' '' '' '' '' '' '' '' '' '(' ' The suil of the "padliti" of the Court of Law of Italy is the pill for the exercise of

  or more than one group or an electric motor and one of the power contractors

  In order to ensure that the linen is flush, the impeller is of the asynchroe type.

  with a wound rotor and which can be transposed in a pure and pure manner (-

  The lion's current flows into his rotor as soon as the tension fails.

  22 - Transport installation according to any one of claims I to 21.

  characterized in that at each end of the railways there is a gate giving onto the track which is barred by any device which has been maneuvered to cause a weakness (

  would raise the situation on seedlings of iniinoblilsdtioll, this disl) positil was ver-

  rusty as soon as the door coiriiniente to open.

  23 - Installation and transport of any of the claims (items I to 22) provided with a device for the immobilization of the system in the event of the opening of a gate on the carded route in such a way that by a system of precision

  appropriate transiilbssion, the movement of this device is tran ss to Iradnl-

  34 which will turn screw-cylinders 35 placed inside the axes of

  pairs of wheels, so as to sail sail

  of antifriction gasket 36 which come to bear on the rails.