Classifications

• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
  • E01B9/00—Fastening rails on sleepers, or the like
  • E01B9/02—Fastening rails, tie-plates, or chairs directly on sleepers or foundations; Means therefor
  • E01B9/04—Fastening on wooden or concrete sleepers or on masonry without clamp members
  • E01B9/14—Plugs, sleeves, thread linings, or other inserts for holes in sleepers

Definitions

• the present invention relates to a device for anchoring an elastic rail fastener in a railway sleeper.
• Anchoring systems are already known comprising a male threaded element intended to be fixed by screwing in a female element with internal or threaded thread, incorporated in the cross-member.
• This female element generally consists of a plastic sheath inserted into the cross member during molding of the latter. But this sheath resists poorly the permanent tensile force exerted by the male element, which results in a creep of the material constituting the sheath, that is to say a continuous deformation resulting in a reduction of the force. tightening and therefore compromising the efficiency of the rail fastener.
• the useful part of the sheath has the same price per unit of length as the remaining part, which is relatively disadvantageous from an economic point of view.
• the object of the present invention is to satisfactorily solve the technical problems resulting from the preceding drawbacks.
• a device for anchoring an elastic rail fastener in a cross member comprising a male element with external thread intended to be fixed by screwing in a female element with thread internal incorporated in the cross member, characterized in that the female element is provided with a helical element integral with its external lateral face.
• the internal diameter of the turns of the helical element is less than or equal to the external diameter of the thread of the male element so as to obtain, in the mounting position, overlapping of the faces opposite the threads respectively. of the helical element and of the male element.
• the helical element consists of a wire of parallelepipedic section and preferably in diamond shape which is screwed onto said female element.
• the height of said female element is greater than or equal to the height of the helical element.
• the device further comprises a collar intended to be received between the upper face of the cross member and the upper edge of the female element.
• said collar comprises a sealing wall forming a sealing capsule and capable of being perforated by introduction of the male element.
• the female element and the helical element are provided with a coating of compressible material ensuring the connection with the cross-member.
• the device also comprises longitudinally extending anti-rotation fins and the outer edge of which is located on or inside the cylinder-envelope of the female element with the helical element or the coating.
• the helical element is metallic and the female element is made of insulating plastic.
• the device of the invention makes it possible to limit creep while increasing the range of the external thread of the male element on the internal thread of the female element, which improves the resistance to tearing.
• the device of the invention can be easily adapted to male elements of different lengths by adjusting the height of the helical element and using a single female element.
• FIGS la and lb show front views with partial vertical sections of a first embodiment of the anchoring device of the invention, respectively in the disassembled position and in the mounted position;
• FIG. 2 shows a front view of the helical element of the invention
• FIG. 3 shows a partial vertical sectional view of a second embodiment of the invention
• FIG. 4 shows a front view of another embodiment.
• the anchoring device shown in FIGS. 1a and 1b is intended for anchoring a rail fastener (not shown) in a railway cross member T. It comprises a male element with an external thread 1 intended to be fixed by screwing in a female element or tapped sheath 2 made of insulating plastic material incorporated in the cross-member T, generally during the molding of the latter.
• the female element 2 comprises a helical element 20 secured to its external lateral face, preferably by screwing onto the body of said element 2.
• the connection between the female element 2 and the concrete of the cross-member T is thus ensured by means of the helical element 20.
• the internal diameter of the turns of the helical element 20 is several millimeters less than the external diameter of the external thread of the male element 1. In this way, in the mounting position, an axial overlapping of the facing faces is obtained. screw threads respectively of the helical element 20 and the male element 1.
• This covering guarantees excellent mechanical resistance in the axial direction, under static or dynamic loading, the force of the male element 1 is thus transmitted to the 'helical element 20 via the side wall of the female element 2 which is formed of a relatively small thickness of elastically deformable plastic material having only a low sensitivity to creep.
• the male element 1 is blocked upward by virtue of the preceding overlap and any break in the anchoring is thus avoided for force values normal in the field considered. It is also planned to leave, in the radial direction in the mounted position, a clearance between the lateral face of the male element 1 and the internal face of the female element 2 so as to compensate for any manufacturing dispersion or else expansion thermal.
• the bottom of the female element 2 is blind as shown in FIGS. 1a and 1b but can also be open out according to embodiments not shown.
• the helical element 20 consists of a metal wire wound helically around an axis XX 'whose section is parallelepipedic and preferably diamond.
• the diamond section allows good functional cooperation between the thread of the male element 1 and the profile of the helical element 20. It also makes it possible to produce the side wall of the female element 2 with a substantially uniform thickness.
• the points of the diamond section which are oriented radially towards the cross-member T in the concrete participate in the retention of the female element 2 in its housing.
• the height of the female element 2 is greater than or equal to the height of the helical element 20 when it is screwed onto the body of said element 2. It is clear however that, given its helical winding, the element 20 has a certain elasticity, especially in the direction XX '. In a particular embodiment, the upper edge of said element 2 is flush with the upper face of the cross member T. It is then provided to have in the mouth of the housing a flange 12 as shown in FIG. 3. The flange 12 then constitutes an extension of the female element 2 by coming to be connected to its upper edge. However, it does not participate in anchoring since it has no thread. In addition, the helical element 20 is not in screwing contact with the flange 12.
• a cylindrical or frustoconical profile will be given at the mouth of the housing so as not to put the flange 12 only after molding of the cross member and drying of the concrete.
• the risks of cracking due to the phenomenon of shrinkage of the concrete are eliminated.
• the collar 12 advantageously comprises a sealing wall 12a forming a sealing capsule.
• the wall 12a is capable of being perforated by introduction of the lower end of the male element 1 during assembly.
• the female element 2 and the helical element 20 are provided with a coating 22 made of compressible material (such as certain elastomeric or plastic materials) which ensures the connection with the concrete of the sleeper T.
• This coating 22 is produced for example by overmolding and makes it possible to absorb the expansion differences between the material constituting the female element 2 and / or the helical element 20 and the concrete of the cross-member T.
• the external lateral face of the coating 22 comprises fins 220 which extend in a longitudinal direction in a discontinuous manner between two adjacent turns of the helical element 20. These fins have the function to prohibit the rotation of the lower part of the anchoring device with respect to the cross member T.
• the devices are produced by molding or overmolding and have a radial width less than or equal to the depth of the helical groove delimited by the envelope cylinder of the coating 22.
• the width radial of the fins 220 is less than or equal to the projecting part of the helical element 20.
• the outer edge of the fins is located on or inside the cylinder-envelope of the lower part of the device anchoring.
• the device will comprise several series of fins 220 aligned or offset on the external lateral face.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Dowels (AREA)
• Railway Tracks (AREA)
• Portable Nailing Machines And Staplers (AREA)
• Chutes (AREA)
• Operating, Guiding And Securing Of Roll- Type Closing Members (AREA)
• Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
• Chain Conveyers (AREA)
• Gear-Shifting Mechanisms (AREA)
• Vibration Prevention Devices (AREA)
• Vehicle Body Suspensions (AREA)
• Supports For Pipes And Cables (AREA)
• Bolts, Nuts, And Washers (AREA)
• Bending Of Plates, Rods, And Pipes (AREA)
• Train Traffic Observation, Control, And Security (AREA)
• Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
• Clamps And Clips (AREA)
• Installation Of Indoor Wiring (AREA)
• Window Of Vehicle (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9449577

Family Applications (1)

Country Status (13)

Cited By (3)

Families Citing this family (1)

Family Cites Families (4)

• 1993
  • 1993-07-23 FR FR9309109A patent/FR2708012B1/fr not_active Expired - Fee Related
• 1994
  • 1994-07-22 DK DK94922294T patent/DK0710308T3/da active
  • 1994-07-22 ES ES94922294T patent/ES2119214T3/es not_active Expired - Lifetime
  • 1994-07-22 MA MA23596A patent/MA23281A1/fr unknown
  • 1994-07-22 AT AT94922294T patent/ATE165882T1/de not_active IP Right Cessation
  • 1994-07-22 HU HU9600144A patent/HU218802B/hu unknown
  • 1994-07-22 EP EP94922294A patent/EP0710308B1/de not_active Expired - Lifetime
  • 1994-07-22 WO PCT/FR1994/000920 patent/WO1995003451A1/fr active IP Right Grant
  • 1994-07-22 DE DE69410097T patent/DE69410097T2/de not_active Expired - Lifetime
  • 1994-07-22 RO RO96-00120A patent/RO116023B1/ro unknown
  • 1994-07-23 DZ DZ940089A patent/DZ1803A1/fr active
  • 1994-07-26 TN TNTNSN94083A patent/TNSN94083A1/fr unknown
• 1998
  • 1998-08-05 GR GR980401774T patent/GR3027588T3/el unknown

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events