FR2546362A1 - PLATINE-SUPORT FOR ELECTRONIC DETECTOR - Google Patents

Abstract

1. Support plate for an electronic detector placed along a railway track rail, having the shape of a reversed L comprising a rectangular plate approximately perpendicular to a holding spline engaging in a clamping clip of a support fixed to the rail, characterised in that it is produced in a single piece in composite stratified material in which the width of the spline (1) is equal to approximately half the length of the plate (2), the lower face of the plate (2) is connected to the inner face (5) of the spline by a rounded surface, and the plate extends beyond the medial plane (9) of the spline (1) by a distance equal to 1/20 to 1/5 of its width.

Description

The present invention relates to the supports for electronic detectors

  placed on the railways for the actuation of the signaling devices, and more particularly a support plate ensuring both the precise positioning and the protection of the detectors and having a good safety of use thanks to a resistance

increased vibration and shock.

  The actuation of signaling devices for rail transport is generally carried out by means of detectors placed along the railroad tracks, attached to one of the

  rails Electro-detectors are used for this purpose.

  mechanical devices comprising one or two levers triggered at the passage of a circulation by the flange of the first wheel, or less heavy electronic sensors and whose operation is still static The equipment used is mounted on a plate removably attached to a

bracket enclosing the base of the rail.

  The stage on which the electronic detector is mounted must meet rigorous conditions with regard to

  the mechanical qualities on the one hand, and the qualities of amor-

  vibration, on the other hand,

  reasons of safety, it is essential that the function

  the electronic detector is not disturbed by the vibrations generated in the rails by the passage of trains, and it is therefore necessary to have a plate

  possessing sufficient resistance both at the

  in the mounting bracket on the rail, and

to vibrations.

  It is also desirable to have effective protection of the detector against shocks caused in one or

  the other direction of circulation, by dragging objects.

  The decks used up to now include -general-

  Two columns made of pressure-resistant steel in the support, supporting a metal plate carrying the detector, are included. Vibration-damping elements are incorporated in this assembly. Such a device is generally satisfactory under the conventional conditions of use, but the increase the speed of the trains leads to an increase in the vibrations, which, by their frequency and their amplitude, risk to cause a rupture of the metal plate In addition, the protection against the trailing objects is not assured 'Studies and tests carried out on parts of similar function manufactured in various materials, have shown that some parts composite laminate material can avoid with a satisfactory efficiency the transmission to the detector of the vibrations generated by the rail at the passage of the convoys, because of the qualities of the materials used and opportunities to adapt However, tests have shown that satisfactory results can only be obtained under very specific conditions of shape and form.

dimensioning of the plate.

  The subject of the present invention is an adapter plate for an electronic detector avoiding the drawbacks of

  usual plates mentioned above, possessing excellent

  vibration resistance, offering protection

effective against shocks.

  The support plate according to the present invention, for a detector placed near a track rail, made of a composite laminate material, has a

  an inverted L shape including a rectangular tray

  perpendicularly to a retaining tongue

  in a clamping claw of a support fixed to the rail, so that the width of the tongue is equal to about half the length of the plate, the lower face of the plate is connected to the inner face of the tongue by a rounded surface, and the tray protrudes beyond the median plane of the tongue over an equal distance

at 1/20 to 1/5 of its width.

  The plate has two slots, preferably of oblong shape, to ensure the attachment of the electronic detector, for example by simple bolting According to a preferred embodiment of the invention, these lights are also used for fixing a complementary device protection comprising a blade attaching

  longitudinally to the plateau, extending to each ex-

  tremity by a U-shaped shield The two shields frame the detector placed on the board, without significantly altering the vibration frequencies, and protect it against possible trailing objects as they pass.

convoys.

  As indicated above, the plate of the support plate protrudes beyond the median plane of the tongue over a distance of between 1/20 and 1/5 of its width; in addition, the connection surface of the plate to the tongue is continuous and has no recess Tests have shown that this arrangement, combined with the use of laminated composite material, effectively damped the vibrations of the plate generated by the passage of a convoy Moreover, the choice of reinforcement fibers incorporated into the material makes it possible to modify the mechanical characteristics of the plate without

  impair its vibration damping qualities.

  The plate is made according to the usual techniques, by molding from a composition which may be for example a composition based on glass fibers, carbon and aramid, embedded in a resin of the polyester, epoxy or vinyl ester type. or a phenolic resin The choice of reinforcing fibers is determined in a known manner according to

  desired mechanical characteristics.

  According to a characteristic of the invention, the surface of the plate of the support plate is parallel to the running surface on the rails of the railroad track. The plate is fixed to the rail by means of a support enclosing the runner of the rail. and this generally having a slope of 1/20 relative to the running surface, it is advantageous to compensate for this slope, for example by using a plate where the plate, whose thickness is constant, forms an angle with the tongue slightly less than 90 (for example 870) to compensate for the inclination of the rail. In a variant, the lower face of the plate is exactly perpendicular to the tongue but the upper face is

  sloping along a slope of 1/20 opposite to that of the rail.

  It is also possible to provide a clamping claw of

  the tab directly compensating for this inclination.

  The plate is fixed by its tongue in the claw of ser-

  rage of a support attaching itself to the rail of the rail by

  Two jaws The clamping and locking of the jaws

  screwed and controlled flattening of

Belleville type spells.

  Tests carried out using the support plate according to the present invention have shown that the above characteristics made it possible to obtain a resonance frequency of the platinum situated between 35 and 60 Hz, that is to say outside resonance frequencies of the rail (80 to 120 Hz) and its harmonics (5 to 30 Hz) On the contrary, turntables made in the same material, but having a shape somewhat

  modified, in particular at the connection of the plateau and the

  watch, do not provide satisfactory results.

  The support plate according to the invention therefore proves to be

  for the installation of electronic detectors along railways, providing greater reliability compared to conventional equipment. Moreover, the cost of

manufacturing is weak.

  The features and advantages of the invention will become apparent

  in more detail in the description below, relating to a

  preferential and nonlimiting embodiment, with reference to

  FIG. 1 is a front view of a board according to the invention.

  Figure 2: a side view of the plate of Figure 1.

  Figure 3: a top view of the protective device fitting on the plate; FIG. 4: a front view of the plate of FIG. 1 supplemented by the protection device of FIG.

figure 3.

  The plate shown in Figures 1 and 2 is made of a composite laminate material manufactured by molding and,

  in the shape of an inverted L It has a lan-

  holding watch (1) intended to be put in place and fixed by clamping at a desired height in a claw of a mounting bracket to the rail (not-represented) of appropriate type, allowing the height of the plate to be freely adjusted relative to to the rail, and a horizontal plate (2) parallel to the running surface, and provided with two slots (3) of oblong shape, allowing the mounting of the electronic detector and

  fixing the protective device.

  The height of the retaining tongue (2) is about 140 mm, its width about 60 mm and its thickness about 8.5 mm This tongue is held by clamping at the appropriate height in a claw secured to a metal support which attaches to the rail pad by two-jaw interlocking The height of the plate is set so that the surface of the detector, whose thickness is about 50 mm,

  about 40 mm below the running surface.

  The tray (2) has a rectangular shape of 160 mm long.

  The lights (3) have an oblong shape of about 30 mm in length to allow precise adjustment of the position of a detector relative to the rail. The angle of the plate (2) with the tongue (1) is about 87, and its thickness is about 12 mm, but according to a variant not shown, it can vary gradually along the width, from about 8 mm at the edge to 12 mm on the side of attachment to the tab which makes it possible to make up the inclination of the runner of the rail at 1/20, and consequently of the holding tab (1) attached thereto,

  and placing the tray surface (2) in a horizontal plane

  zontal. To provide a satisfactory damping of the vibrations generated in the rail by the passage of trains, it is important that the dimensions of the tongue (1) and the plate (2) are in the proportions of the values indicated above, that the average plane of the tongue (1) passes approximately 1 mm from the inside edge of the plate (2), which protrudes about 6 mm beyond the outer surface (4) of the tongue (1), and that the surface connecting the-edge at the tongue does not present a break On the other hand, the lower surface of the plate (2)

  and the inner surface (5) of the tongue (1) meets

  following a rounding corresponding to a radius of 20 mm

about.

  As shown in Figures 3 and 4, the protective device comprises a blade (6) at the ends of which are fixed two folded shields (7) U-shaped towards the plate (2) The height of these shields (7) corresponds substantially to the thickness of the detector (not shown) which is fixed on the plate (2) by means of the threaded rods (8)

  which are also used to fix the

  tection. The protective device is made by molding using

  of the same composite laminate material as platinum.

Claims (3)

R E V E N D I C A T IO N S   1 Support plate for an electronic sensor placed along a rail of a track, having the shape of an inverted L comprising a rectangular plate substantially perpendicular to a retaining tab engaging in a clamping claw of a support fixed to the rail, characterized in that it is made in one piece of laminated composite material in which the width of the tongue (1) is equal to about half the length of the plate (2), the underside of the plate (2) connects to the inner face (5) of the tongue by a rounded surface, and the plate protrudes beyond the median plane of the tongue (1) for a distance equal to 1/20 to 1/5 of its width.  2 support plate for a detector according to claim 1, characterized in that it comprises a blade (6) fixed to the plate (2), extending at each end by a shield (7) folded U-shaped. 3 Detector support plate according to Claim 1, characterized in that the connection surface of the plate at the tongue is continuous.