US3368759A - Railway tracks - Google Patents

Railway tracks Download PDF

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Publication number
US3368759A
US3368759A US531676A US53167666A US3368759A US 3368759 A US3368759 A US 3368759A US 531676 A US531676 A US 531676A US 53167666 A US53167666 A US 53167666A US 3368759 A US3368759 A US 3368759A
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US
United States
Prior art keywords
sleeper
rail
rails
forces
sleepers
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 - Lifetime
Application number
US531676A
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English (en)
Inventor
Olson Erik
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.)
Swedish Rail System AB SRS
Original Assignee
Swedish Rail System AB SRS
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 Swedish Rail System AB SRS filed Critical Swedish Rail System AB SRS
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Publication of US3368759A publication Critical patent/US3368759A/en
Anticipated expiration legal-status Critical
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B5/00—Rails; Guard rails; Distance-keeping means for them
    • E01B5/16—Distance keepers

Definitions

  • the utilization of concrete sleepers has been limited substantially to straight tracks, because the concrete as structural material is not suitable for taking up tensile forces and on account of its low impact strength or toughness is not well adapted for resisting the strains which may be caused by railway vehicles in narrow curves, and the invention has for its object to create a device which, utilizing the development mentioned above, allows a reduction of the lateral forces transferred to the sleepers in curves.
  • the device according to the invention is characterized in that between the two rails and below the rail bases, an elastically extensible member is disposed for connecting the two rails with each other and with each sleeper, said member being provided for receiving and taking up the lateral forces of the two rails, these lateral forces being oppositely directed as the lateral force on the inner rail of the curve is directed inwards in the curve, said member being also provided for transferring to the sleepers only the horizontal resultant of these lateral forces (instead of the lateral force of each rail per se).
  • FIG. 1 is a side view of a sleeper together with the two rails and an elastically extensible member according to one embodiment of the invention.
  • FIG. la is a perspective view of the rail anchoring means as used in the embodiment according to FIG. 1.
  • FIG. 2 is a side view of a sleeper and an elastically extensible member according to another embodiment of the invention.
  • FIG. 3 is a plan view corresponding to FIG. 2.
  • FIG. 4 is a side view of a sleeper and an elastically extensible member according to a modification of FIG. 2.
  • FIG. 5 is a side view of a sleeper and an elastically extensible member according to a further embodiment.
  • FIG. 6 is a plan view corresponding to FIG. 5.
  • FIG. 7 is a transversal cross-section on the line VII VII in FIG. 5, on a greater scale.
  • FIG. 8 is a side view of an element of the device according to FIGS. 5 to 7.
  • the sleeper 1 shown in FIG. 1 consists of two end blocks of concrete and an interconnecting tube filled with concrete and containing a through-going reinforcing bar (not shown) for pretensioning the sleeper, as well-known in the art.
  • the elastically ertensible member consists of a relatively broad flat iron bar 2 which extends along the top surface of the sleeper in contact with the bottom surface of the rail bases (feet) of the rails 3 and has its two ends 2a bent downwards at each side of the ends of the sleeper.
  • Pads 4 of hard rubber or the like can be provided between the flat iron bar 2 and the sleeper.
  • Rail anchoring means 5 are provided between the top surface of the fiat iron bar 2 and the rail bases, said rail anchoring means comprising plates :Sa embracing the rail base, loops 5b attached to the flat iron bar 2 and projecting through slots in the plates 5a, and wedges 5c forced through the loops 5b for pressing upon the flanges of the rail base.
  • the flat iron bar 2 can be provided with plates 2b welded to the same at the inner sides of the end blocks.
  • the major part of the lateral forces which are developed between a railway vehicle and the body of the railway in a curve is received and taken up by the extensible member 2 before the resultant of these lateral forces is transmitted into the sleeper.
  • the lateral forces in this way have been reduced substantially before they are transferred into the concrete sleeper, they also have been distributed into the parts of the concrete sleeper, where the reaction forces are greatest, viz, directly below the rail bases (rail feet).
  • the elastically extensible member should be designed so as to allow an elongation which, calculated on the width between the rails, has a value between the limits 1 and 10 mm. but usually 2 and 6 mm., preferably 3 to 5 mm., for instance 4 mm.
  • an elongation which, calculated on the width between the rails, has a value between the limits 1 and 10 mm. but usually 2 and 6 mm., preferably 3 to 5 mm., for instance 4 mm.
  • the elastically extensible member comprises a flat iron bar 6 which extends along the top surface in contact with the bottom surface of the rail bases, the two ends of said fiat iron bar not being bent downwards, as according to FIG. 1, but being bent upwards at the outer edge of each rail base.
  • the reference numeral 4 indicates the pads and 5 is the rail anchoring means, the last-mentioned means extending below pegs 7 inserted through holes in the sleeper, and being curved to engage under tension on the top surfaces of the rail bases, as well-known in the art.
  • the fiat iron bar 6 is slightly corrugated in its central portion for allowing a greater resiliency so that the width between the rails or the rail gauge can be varied.
  • the elastically extensible .member may comprise two round iron bars 8, flat iron bars or profile iron bars, each at one side of the sleeper and extending along the respective side of the sleeper, the two ends of each bar being bent upwards above the outer edge of the associated rail base, rail anchoring means 5 being disposed between the sleeper and the rail bases.
  • the elastically extensible member 2, 6 or 8 takes up the lateral forces of the two rails before these forces are transferred to the sleeper inasmuch as the sleeper receives only the resultant of the oppositely directed lateral forces of the two rails.
  • an elastic member for reducing the lateral forces transmitted to the sleepers, particularly in the curves, said member being positioned between the rails and below the same and said member being extensible a predetermined distance and disposed for connecting the two rails with each other and withthe sleepers, and
  • the extensible elastic member comprises a relatively broad, flat, iron bar which extends along the top surface of the sleeper in contact with the bottom surface of therailway track rails and has its two ends directed downwards at each side of the sleeper ends, and
  • the extensible elastic member comprises a flat, iron bar which extends along the top surface of the sleepers in contact with the bottom surface of the bases of the rails and has its two ends directed upwardly at the outer edge of each rail base, and
  • the extensible elastic member comprises two iron bars, one on each side of the sleeper, which extend along the respective sides of the sleeper and wherein the two ends of each bar are directed upwardly above the outer edge of the associated rail base, and

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Railway Tracks (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
US531676A 1965-03-11 1966-03-04 Railway tracks Expired - Lifetime US3368759A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE3206/65A SE305007B (enrdf_load_html_response) 1965-03-11 1965-03-11

Publications (1)

Publication Number Publication Date
US3368759A true US3368759A (en) 1968-02-13

Family

ID=20261608

Family Applications (1)

Application Number Title Priority Date Filing Date
US531676A Expired - Lifetime US3368759A (en) 1965-03-11 1966-03-04 Railway tracks

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US (1) US3368759A (enrdf_load_html_response)
GB (1) GB1097766A (enrdf_load_html_response)
SE (1) SE305007B (enrdf_load_html_response)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3494555A (en) * 1968-02-23 1970-02-10 Brown Co D S Rail holddown apparatus
US3598312A (en) * 1968-12-16 1971-08-10 Portec Inc Synthetic crosstie
US3739981A (en) * 1971-11-05 1973-06-19 Abex Corp Concrete ties

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US795622A (en) * 1904-12-17 1905-07-25 Buel Couch Road-bed equipment.
US904438A (en) * 1907-10-29 1908-11-17 Thomas N Jacob Rail-support.
US913238A (en) * 1908-08-25 1909-02-23 Sterling A Ross Railway tie and chair combined.
US1012942A (en) * 1911-07-10 1911-12-26 James T Wade Tie.
US1056201A (en) * 1912-06-24 1913-03-18 Charles Franklin Mobley Metallic railroad-tie.
US1086262A (en) * 1913-02-15 1914-02-03 Thaddeus D Allen Railway-tie.
US1112613A (en) * 1914-02-18 1914-10-06 Frank O Hellstrom Rail-support.
US2035933A (en) * 1934-12-29 1936-03-31 Lewis F Wilson Railway tie

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US795622A (en) * 1904-12-17 1905-07-25 Buel Couch Road-bed equipment.
US904438A (en) * 1907-10-29 1908-11-17 Thomas N Jacob Rail-support.
US913238A (en) * 1908-08-25 1909-02-23 Sterling A Ross Railway tie and chair combined.
US1012942A (en) * 1911-07-10 1911-12-26 James T Wade Tie.
US1056201A (en) * 1912-06-24 1913-03-18 Charles Franklin Mobley Metallic railroad-tie.
US1086262A (en) * 1913-02-15 1914-02-03 Thaddeus D Allen Railway-tie.
US1112613A (en) * 1914-02-18 1914-10-06 Frank O Hellstrom Rail-support.
US2035933A (en) * 1934-12-29 1936-03-31 Lewis F Wilson Railway tie

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3494555A (en) * 1968-02-23 1970-02-10 Brown Co D S Rail holddown apparatus
US3598312A (en) * 1968-12-16 1971-08-10 Portec Inc Synthetic crosstie
US3739981A (en) * 1971-11-05 1973-06-19 Abex Corp Concrete ties

Also Published As

Publication number Publication date
SE305007B (enrdf_load_html_response) 1968-10-14
GB1097766A (en) 1968-01-03

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