FR2553122A1 - SHOE FOR ELASTIC RAIL FASTENER - Google Patents

Abstract

THE PRESENT INVENTION CONCERNS A TRACK ATTACHMENT USING AN ELASTIC BLADE KNOWN AS DESCRIBED IN FRENCH PATENT 2,481,334 AND A SHOE, THEIT CLOKE CONTAINING A CORE11 WHICH INSERTS IN THE LOOP4 OF THE SAID BLADE, A BODY, ASSOCIATED WITH THE SAID CORE, PROVIDED WITH AN OPENING FOR THE PASSAGE OF A TIGHTENING BODY AND A TALON6 PROVIDED TO CONSTITUTE A STOP AGAINST THE EDGE OF THE RAIL SHOE, AND AN EXTENSION7 PROVIDES ABOVE THE RAIL SHOE, THIS SHOE BEING CHARACTERIZED IN THIS THAT ITS UPPER FACE INCLUDES A BOSSAGE8 LOCATED SENSITIVELY TO THE RIGHT OF THE EDGE OF THE RAIL PAD, THIS BOSSAGE SEPARATING TWO HOLLOW PARTS.

Description

2553 1 22

  Shoe for elastic rail attachment.

  The present invention relates to a new shoe (or stop) usable for producing an elastic fixing of a rail on a cross member and, more particularly, on a reinforced concrete cross member. In sinuous railways, the connection of the rails to the sleepers or other supports includes guides or lateral stops, the main drawback of which is the reciprocal wear of the rail and the stopper. This wear is obviously not favorable to keeping a good track geometry and, in some cases, it leads to a partial deterioration of the rail

  which makes it non-reusable.

  The guides can have other drawbacks such as too great rigidity which makes them difficult to use with concrete sleepers and for elastic metal stops insufficient resistance to the large forces which are developed during the passage of convoys in the small radius curves. Stops made of synthetic resin have been used for a few years which ensure the electrical isolation of the rail from the metal blade which clamps it on its support. In their current arrangement, these stops prevent precise adjustment of the blade clamping force and cannot therefore be used in curves with a small radius. The device described in patent NO 2 481 334 is then used, with which the fastener bears directly on the rail pad, and the electrical isolation is done by surrounding the

  fixing bolt of a barrel washer which is housed in a recess made in the blade and in the stop This recess weakens them and causes ruptures when the stresses are too severe.

  I 1 on the other hand there are larger and more expensive insulating stops operating with different blades designed to distribute their pressure over a large area.

  require special concrete sleepers for their use; they cannot be applied to existing ordinary sleepers.

  The present invention relates to a rail fastener using the known elastic blade described in French Patent No. 2,481,334 and a shoe, said shoe comprising a core 11 which is inserted in the loop 4 of said blade, a body integral with said core provided an opening for the passage of a tightening member and a heel 6 arranged to constitute a stop against the edge of the rail pad, and an extension 7 disposed above the rail pad, said shoe being characterized in that its upper face has a boss 8 located substantially to the right of the edge of the pad

  of the rail, said boss separating two recessed parts.

  The core 11 of the shoe is used to attach and place said shoe under the elastic blade.

  The extension 7 of the shoe above the rail shoe is used to achieve complete isolation of the blade by

compared to rail.

  The boss 8 is used to control the clamping 15 of the blade on the shoe and cause a blocking of the shoe stop.

against the rail pad.

  A fastener according to the invention is shown diagrammatically in FIGS. 1 to 3.

  FIG. 1 is a side view of the device placed, not tight, on the shoe of the rail; Figure 2 is a side view of the same device clamped on the rail pad; Figure 3 is a top view of the shoe used in the fastener

according to the invention.

  According to Figure 1, the fastener according to the invention comprises a blade L and a shoe S It serves to fix the rail R on the cross member T, an elastic and insulating sole I being disposed between the rail R and the cross member T. The blade L made of spring steel has a hole 1 for the passage of the clamping member 2 shown in FIG. 2, one end 3 resting on the shoe S and one end wound in the form of a loop 4 which serves as with the crosspiece

  on the one hand and with the shoe S on the other hand.

  The shoe S made of polyamide, polyacetal resin, or other material of the same elasticity comprises: an orifice 5 coaxial with the orifice 1 of the blade for the passage of the clamping member 2, a heel 6 forming a lateral stop for the rail, an extension 7 which isolates the blade L from the rail R and comprises a boss 8 leaving a clearance J of well-determined value between the blade L and its shoe S, a support 10 provides for the blade, a recess 9 which separates the support 10 of the boss 8 and a core 11 whose shape adapts to the partially cylindrical interior shape of the loop 4 Between the core 11 and the

  boss 8, the upper face 12 of the shoe S is slightly curved.

  The underside 13 of the shoe S does not come into contact with the crosspiece T and has a small shoulder 14 which serves to position the insulating sole I. As can be seen in FIG. 2, the tightening of

  the blade L by the clamping member 2 brings it into contact with the boss 8.

  This blade L articulated by the loop 4 with the cross-member T and placed on the support 10 has a well-defined flexibility The stroke J which brings it into contact with the boss corresponds to a precise force of clamping on the support 10 of the shoe S and therefore on the rail pad The recess 9 and the curving of the upper face 12 of the shoe S are intended to avoid distorting the force applied to the rail by

  imprecise blade contact with the shoe during tightening.

  The force and the position of the blade being thus fixed, the rail, when a train passes, is subjected to forces and vibrations. The movement of the edge of the shoe of the rail is limited upwards by the presence of the boss applied to the blade, itself held by the tightening member, it is limited laterally by the heel 6 of the shoe Small movements are allowed downwards by the compression of the insulating sole I but in these movements the shoe S which remains at the contact of the edge of the rail pad by the heel 6 is articulated by the core 11 in the loop 4, follows

  all movements of the R rail and does not wear out.

  To facilitate installation and avoid any error, the shoe S can be assembled to the blade L by a fold 15 of the shoe beyond the support 10 and the flanges 16 and 17 which appear in

Figure 3.

  The present invention applies to the fixing of the rails on the sleepers or any other support and more particularly on the concrete supports of the railway tracks, in curve of

small radius.

RE VE N DI C A T I ON S

  1 Fastener for rail consisting of two separate parts, namely an elastic blade comprising a loop (4), capable of bearing on a support such as a cross member and a plastomer or shoe stop Said shoe comprises a core (11) which s inserts into the loop (4) of said blade, a body, integral with said core, provided with an opening for the passage of a clamping member and a heel (6) arranged to constitute a mound against the shoe of the rail and an extension (7) disposed above the shoe of the rail, said shoe being characterized in that its upper face includes a boss (8). 10 2 elastic clip according to claim 1, characterized in that the blade and its shoe are held together by a fold

  and flanges located around said support.