US3910492A - Insulated rail joints - Google Patents

Insulated rail joints Download PDF

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Publication number
US3910492A
US3910492A US403623A US40362373A US3910492A US 3910492 A US3910492 A US 3910492A US 403623 A US403623 A US 403623A US 40362373 A US40362373 A US 40362373A US 3910492 A US3910492 A US 3910492A
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US
United States
Prior art keywords
bar
rail
bolt holes
moulded
pair
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
US403623A
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English (en)
Inventor
Kenneth Stanley Sinfield
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.)
NATIONAL SPRINGS Pty Ltd
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NATIONAL SPRINGS Pty Ltd
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 NATIONAL SPRINGS Pty Ltd filed Critical NATIONAL SPRINGS Pty Ltd
Application granted granted Critical
Publication of US3910492A publication Critical patent/US3910492A/en
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Expired - Lifetime legal-status Critical Current

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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
    • E01B11/00—Rail joints
    • E01B11/54—Electrically-insulating rail joints

Definitions

  • ABSTRACT A rail joint bar moulded as a solid component from a reinforced dielectric material, to finished crosssectional shape and overall dimensions.
  • the bar is shaped and dimensioned to include surfaces which tighten in a wedging action against the head and flange of a rail when bolted to the rail.
  • a pair of the bars are secured on opposite sides of the rail web to form a rail joint, with the bars clear of the rail web by virtue of their engagement with the head and flanges of the rail, thus ensuring that the pair of bars move with the rail during service and retain their clamped position at all times.
  • This invention relates to improvements in insulated rail joints and more particularly to insulated rail joint bars (fish plates) which are moulded a solid component from a reinforced dielectric material.
  • the invention also relates to a method of forming such rail joints using a pair of rail jointbars according to the invention secured to opposite sides of the webs of two rails, by bolts or similar clamping devices.
  • the present invention proposes the use of joint bars manufactured in such a way from a solid insulating or dielectric material so as to reduce the possible modes of failure to only that of a complete physical or mechanical rupture of the joint bars themselves.
  • the rail joint bar is moulded a solid component from a reinforced dielectric material to finished cross-sectional profile shape and overall dimensions and has a plurality of longitudinally spaced bolt holes formed therethrough.
  • the bar is moulded from a thermosetting glass filament reinforced material having strands of the glass filament reinforcement running longitudinally of the bar and disposed in random spacing throughout the bar crosssection.
  • the bar includes top and bottom surfaces adapted to respectively engage the under surface of a rail head and the upper surface of the rail flange when mounted upon the rail and is dimensioned to tighten in a wedging action against said rail surfaces when bolted to the rail.
  • a rail joint is formed by securing a pair of the rail joint bars to opposite sides ofa rail web, the pair of bars being bolted to the rail web with the top and bottom surfaces of the bar respectively engaging the under surface of the rail head and the upper surface of the rail flange, with the bar clear of the rail web.
  • FIG. 1 is a perspective of the rail joint bar, looking from one end of the bar and at the vertical outer surface thereof.
  • FIG. 2 is an elevational view of the bar looking at the vertical outer surface thereof.
  • FIG. 3 is a similar view to FIG. 2 but looking at the opposite (inner) surface of the bar.
  • FIGS. 4, 5 and 6 are sectional views taken on the planes 44, 55 and 6-6 of FIG. 2 and FIG. 7 is an end view of an assembly of a pair of the bars of the invention upon a rail.
  • the bar is moulded to the finished profile shape and overall dimensions from a reinforced plastics material and has a plurality of longitudinally spaced bolt holes 2 formed therethrough either during the moulding operation or subsequently. No machine operations are required to produce the desired cross-sectional shape on the bar 1 and thus the continuity of the reinforcement is maintained in the areas between and surrounding the bolt holes 2.
  • the cross-sectional shape of the bar is such that when mounted on a rail R as a pair, the bars engage the downwardly inwardly tapered under surface of the rail head H and the upwardly inwardly tapered upper surface of the rail flange F.
  • the cross-sectional profile of the bar 1 comprises a flat, vertical outer surface 3 blended by radiussed corners 4 into top and bottom surfaces.
  • the top surface extends upwardly inwardly as at 5 from the upper radiussed comer 4 for a short distance and then downwardly inwardly as at 6 and the downwardly inwardly extending part 6 engages the under surface of the rail head.
  • the bottom surface extends upwardly inwardly from the lower corner 4 as at 7 and engages the upper surface of the rail flange.
  • the lower corner 4 is chamfered at 8 at the end regions of the bar 1.
  • the chamfers 8 provide clearance for the heads of dogspikes which are fixed in conventional manner for securing a rail to sleepers, a feature not found on other known joints of the type referred to with which conventional dogspikes and other known fasteners cannot be used.
  • the downwardly inwardly extending part 6 of the top surface and the bottom surface 7 are blended by suitable radiussed projections 9, into a pair of flat, vertical inner surfaces 10 which are set back from the projections 9 towards the outer surface 3, on each side of a centre region 11 of bar 1 which includes region 12 surrounding those bolt holes 2 (centre bolt holes), located in region 12, and the vertical, inner surface 11-12 extends to the full width of the bar 1.
  • a pair of steel plates 13 are bonded to the vertical outer surface 3 over the bolt holes 2 and they have bolt holes 14 formed therethrough registering with the bolt holes 2 in the bar 1.
  • the steel plates are separated longitudinally from each other in the centre region 11 to maintain the insulating properties of a joint assembly of the bars 1 and they serve to distribute bolt clamping loads through the joint.
  • the bar 1 is moulded from a thermosetting polymer such as epoxide or unsaturated polyester resin, it is heavily reinforced with glass filaments.
  • the filaments run longitudinally of the bar and they are disposed in random spacing throughout the bar cross-section.
  • thermosetting resins of the type referred to developments in the plastics industry may produce other materials capable of providing'thcrequired properties in the joint, from which the joint can be 'moulded at a cost consistent with the cost of the joint as described.
  • a rail joint bar moulded as a solid component from a reinforced dielectric material said bar being moulded to finished cross-sectional profile shape and overall dimensions and having a plurality of longitudinally spaced bolt holes formed therethrough, said bar being moulded from a thermosetting, glass filament reinforced material having strands of the glass filament reinforcement running longitudinally of the bar and disposed in random spacing throughout the bar crosssection, said bar including top and bottom surfaces adapted to respectively engage the under surface of a rail head and the upper surface of the rail flange when mounted upon the rail and being dimensioned to tighten in a wedging action against said rail surfaces when bolted to the rail, the cross-sectional profile of the bar comprising a flat, vertical outer surface blended; by upper and lower radiussed corners into top and bot-. tom surfaces, 7 the top surface extending upwardly in-l wardly from the upper radiussed corner and then outer'surface and located on each side of a center inner vertical surface extending to the full width of the bar,
  • said center inner vertical surface being located in a center--region of the bar and including regions surlrounding those said bolt holes located in this region, a pair of steel plates bonded tothe vertical outer surface of the bar and separated longitudinally from each other in said center region of the bar, said steel plates having bolt holes formed therethrough in registerwith the bolt holes in the bar; the lowerradiussed corner of the bar 7 being chamfered at each end region of the bar beneath the respective steel plates.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Connection Of Plates (AREA)
  • Insulators (AREA)
US403623A 1972-10-10 1973-10-04 Insulated rail joints Expired - Lifetime US3910492A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AUPB078372 1972-10-10

Publications (1)

Publication Number Publication Date
US3910492A true US3910492A (en) 1975-10-07

Family

ID=3765405

Family Applications (1)

Application Number Title Priority Date Filing Date
US403623A Expired - Lifetime US3910492A (en) 1972-10-10 1973-10-04 Insulated rail joints

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US (1) US3910492A (enrdf_load_html_response)
AT (1) AT325086B (enrdf_load_html_response)
AU (1) AU5993773A (enrdf_load_html_response)
BE (1) BE805899A (enrdf_load_html_response)
CA (1) CA1005413A (enrdf_load_html_response)
DE (1) DE2350152A1 (enrdf_load_html_response)
FR (1) FR2202195B1 (enrdf_load_html_response)
GB (1) GB1418967A (enrdf_load_html_response)
IT (1) IT996260B (enrdf_load_html_response)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080035749A1 (en) * 2004-06-17 2008-02-14 Igwenezie Jude O Device for Joining Rails
US20100096468A1 (en) * 2008-10-22 2010-04-22 Jude Odihachukwuma Igwemezie Device for insolated joint for joining rails
US20100127091A1 (en) * 2008-11-24 2010-05-27 Jude Odihachukwuma Igwemezie Rail joint bar with transferred load

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6043501A (ja) * 1983-08-18 1985-03-08 財団法人鉄道総合技術研究所 レ−ル絶縁継目用絶縁板
EP0229860A1 (de) * 1986-01-22 1987-07-29 Tschan GmbH Lasche für einen Gleisbau-Isolier-Schienenstoss

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1736328A (en) * 1927-02-10 1929-11-19 Neil E Salsich Insulated rail joint
US3190558A (en) * 1962-11-16 1965-06-22 William E Griffiths Rail joint bar
US3288369A (en) * 1965-06-18 1966-11-29 Poor & Co Rail joint
US3335954A (en) * 1966-03-17 1967-08-15 Poor & Co Insulated rail joint
US3420441A (en) * 1967-04-27 1969-01-07 John H Deckert Apparatus for fastening the joints of railroad rail

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1373422A (fr) * 1963-10-25 1964-09-25 Procédé de production d'une éclisse pour un joint de rails isolant et éclisse obtenue
US3369752A (en) * 1967-04-27 1968-02-20 Minnesota Mining & Mfg Electrically insulated rail joint means

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1736328A (en) * 1927-02-10 1929-11-19 Neil E Salsich Insulated rail joint
US3190558A (en) * 1962-11-16 1965-06-22 William E Griffiths Rail joint bar
US3288369A (en) * 1965-06-18 1966-11-29 Poor & Co Rail joint
US3335954A (en) * 1966-03-17 1967-08-15 Poor & Co Insulated rail joint
US3420441A (en) * 1967-04-27 1969-01-07 John H Deckert Apparatus for fastening the joints of railroad rail

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080035749A1 (en) * 2004-06-17 2008-02-14 Igwenezie Jude O Device for Joining Rails
US7735745B2 (en) * 2004-06-17 2010-06-15 Jude Odihachukwunma Igwenezie Device for joining rails
US20100096468A1 (en) * 2008-10-22 2010-04-22 Jude Odihachukwuma Igwemezie Device for insolated joint for joining rails
US7735746B2 (en) * 2008-10-22 2010-06-15 Jude Odihachukwunma Igwenezie Device for insolated joint for joining rails
US20100127091A1 (en) * 2008-11-24 2010-05-27 Jude Odihachukwuma Igwemezie Rail joint bar with transferred load

Also Published As

Publication number Publication date
AU5993773A (en) 1975-03-06
DE2350152A1 (de) 1974-05-02
CA1005413A (en) 1977-02-15
BE805899A (fr) 1974-02-01
FR2202195A1 (enrdf_load_html_response) 1974-05-03
GB1418967A (en) 1975-12-24
IT996260B (it) 1975-12-10
FR2202195B1 (enrdf_load_html_response) 1978-02-10
AT325086B (de) 1975-10-10

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