US3635357A - Modified pinhole for railway couplers - Google Patents

Modified pinhole for railway couplers Download PDF

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Publication number
US3635357A
US3635357A US62540A US3635357DA US3635357A US 3635357 A US3635357 A US 3635357A US 62540 A US62540 A US 62540A US 3635357D A US3635357D A US 3635357DA US 3635357 A US3635357 A US 3635357A
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United States
Prior art keywords
pinhole
coupler
shank
radius
generated
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
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US62540A
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English (en)
Inventor
Russell George Altherr
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Amsted Industries Inc
Original Assignee
Amsted Industries Inc
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
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Publication of US3635357A publication Critical patent/US3635357A/en
Anticipated expiration legal-status Critical
Assigned to AMSTED INDUSTRIES INCORPORATED, A CORP. OF DE. reassignment AMSTED INDUSTRIES INCORPORATED, A CORP. OF DE. RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: FIRST NATIONAL BANK OF CHICAGO, AS AGENT
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61G—COUPLINGS; DRAUGHT AND BUFFING APPLIANCES
    • B61G3/00—Couplings comprising mating parts of similar shape or form which can be coupled without the use of any additional element or elements
    • B61G3/04—Couplings comprising mating parts of similar shape or form which can be coupled without the use of any additional element or elements with coupling head having a guard arm on one side and a knuckle with angularly-disposed nose and tail portions pivoted to the other side thereof, the nose of the knuckle being the coupling part, and means to lock the knuckle in coupling position, e.g. "A.A.R." or "Janney" type

Definitions

  • This invention relates generally to railway car couplers and more particularly to the pinhole through the shank end of an A.A.R.-type F" coupler.
  • A.A.R. One purpose of the A.A.R. standards is to make the knuckle the weakest part of the coupler. A failure of the knuckle is preferred in order to prevent the coupler from severing in other. locations and causing possible coupler disengagement, underframe damage and derailment.
  • the present invention provides a new and novel improved pinhole for thestandard A.A.R.-type F" coupler.
  • the pinhole has a top and bottom strap which is formed in a compound curve generated by a plurality of radii.
  • Another object of the invention is to provide a new and improved pinhole for a type F" coupler which results in improved coupler life and minimal coupler shank failure.
  • FIG. I is a fragmentary side sectional view of an A.A.R.- type F" coupler shank connected to the underframe of mailway car;
  • FIG. 2 is an enlarged fragmentary top plan view, partly in section, illustrating the pinhole area of the shank of an A.A.R.-type F" coupler;
  • FIG. 3 is an enlarged side section view taken along line 33 of FIG. 2 illustrating the new contour of the pinhole area with the old contour shown ih dashed lines;
  • FIG. 4 is a fragmentary top plan view of FIG. 3 illustrating the new contour of the pinhole area with the old contour shown in dashed lines;
  • FIG. 5 is a fragmentary bottom plan view of FIG. 3 illustrating the new contour of the pinhole area with the old contour shown in dashed lines.
  • FIG. I there is shown an A.A.R.-type F coupler generally designated by the numeral which comprises a rearward shank l2 and a forward knuckle not shown-in the drawing.
  • a pin 14 has its ends joumaled in a yoke'I6 and projects through a pinhole 18 in the shank 12.
  • a pin-bearing block 20 located in the pinhole 18 is engageable with thepin 14 for pivotal universal connection of the coupler 10.
  • the coupler shank I2 is supported in the area of the pinhole 18 by a wall 22 of the yoke 16 and also at its forward end by a flexible coupler carrier 24 mounted in a striker casting 26.
  • the yoke 16 and striker casting are secured to the underframe 28 of the railway car not shown in the drawing.
  • a butt 30 of the shank 12 contacts a front follower 32 which in turn engages a draft gear not shown inthe drawing.
  • the shank I2 comprises a boxlike section defined by sidewalls 34 and 36, a top wall 38 and a bottom wall 40.
  • the pinhole I8 is located rearward of this section and is defined by the butt 30, walls 42 and 44 which are extensions of the sidewalls 34 and 36 and a transverse front wall 46 which encloses one end of the boxlike section.
  • a spherical bearing seat 48 is located in the pinhole 18 on the butt 30 and is in mating engagement with a cooperating spherical bearing surface on the pin-bearing block 20.
  • the centerline B-B of the pin 14 may be located by A.A.R. dimensions that are readily available to those skilled in the art.
  • the radius of the bearing seat 48 may also be maintained according to A.A.R. dimensions so that an A.A.R. approved bearing block 20 may be used.
  • the top and bottom surfaces 56 and 58 may angle away from their respective A.A.R. dimensioned upper and lower sidewall surfaces 60 and 62 according to standard A.A.R. dimensions and become part of the top and bottom surfaces of the butt 30.
  • the inner surfaces 64 and 65 may also be located by standard A.A.R. dimensions at section 3-8 to assure proper relationship to pin 14 during rotation of the coupler.
  • FIGS. 3-5 illustrate the present A.A.R. approved contour for type F couplers at the top and bottom straps 52 and 54.
  • the top strap 52 shown in FIG. 4 is partially defined by a surface generated by the outer point of a radius R, struck from a point on the longitudinal centerline A-A.
  • a pair of side radii R are then struck from a point within the pinhole 18 so that their generated arcs are tangential to the sidewall inner surfaces 64 and 65.
  • Completing the improved pinhole contour are a pair of connecting radii R which are also struck from a point within the pinhole so that their generated are are tangential to the arcs generated by R, and R3- I In the improved embodiment shown in FIGS.
  • the stress concentration is greatly reduced at section A-A by the use of the large concave radius R which may range in length from 3 inches up to and including infinity/The stress concentration at the sidewalls is also greatly reduced by the use of the pair of side radii R and the pair of connecting radii R which results in an increase in section asthe radius progresses rearward from sidewalls 64 and 65.
  • the exact location of the pair of connecting radii R is determined by the relative stiffness of the butt 30 and the sidewalls 34 and 36 to be near the point of inflection.
  • the pair of side radii R are generally greater than three-quarters of an inch in length.
  • top strap 5 is formed in a manner similar to the top strap 52 with the plurality of radii R,, R and R It has been observed that while metal is actually removed from the butt 30 and the intersections 50 and 51, the strength of the coupler shank 12 is not substantially reduced.
  • the im proved top and bottom straps 52 and 54 have been found after extensive tests to have greatly reduced stress levels in tension and compression over prior art standard A.A.R. contours thereby increasing coupler life and notably reducing failures in the pinhole area 18.
  • Actual test results with tension and compression loadings of a prior art standard coupler and an improved coupler of the present invention show that the improved coupler of the present invention materially reduced stress concentrations at the failure points.
  • R is a central radius struck from a point substantially on the longitudinal centerline of the shank, so that its generated arc is symmetrical about the longitudinal centerline; b. R;, is a side radius struck from a point within the pinhole so that its generated arc is tangential to the sidewalls; and c. R is a connecting radius struck from a point within the pinhole so that its generated arc is tangential to the are generated by R and R 2.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
  • Connection Of Plates (AREA)
  • Earth Drilling (AREA)
US62540A 1970-08-10 1970-08-10 Modified pinhole for railway couplers Expired - Lifetime US3635357A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US6254070A 1970-08-10 1970-08-10

Publications (1)

Publication Number Publication Date
US3635357A true US3635357A (en) 1972-01-18

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ID=22043163

Family Applications (1)

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US62540A Expired - Lifetime US3635357A (en) 1970-08-10 1970-08-10 Modified pinhole for railway couplers

Country Status (6)

Country Link
US (1) US3635357A (es)
BE (1) BE769171A (es)
CA (1) CA935788A (es)
ES (1) ES198012Y (es)
GB (1) GB1294434A (es)
ZA (1) ZA713353B (es)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3888358A (en) * 1974-07-25 1975-06-10 Halliburton Co Coupling assembly
US5096075A (en) * 1989-05-17 1992-03-17 Mcconway & Torley Corporation Slackless drawbar with gravity responsive wedge
US6446820B1 (en) * 2000-09-07 2002-09-10 Amsted Industries Incorporated Railcar draft gear assembly and system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2889940A (en) * 1955-06-20 1959-06-09 Nat Malleable & Steel Castings Railway draft rigging
US2973103A (en) * 1959-05-22 1961-02-28 American Steel Foundries Coupler bearing block assembly
US3402825A (en) * 1966-12-07 1968-09-24 Cushion Coupler Corp Railway cars provided with draft riggings incorporating shock-ab-sorbing mechanisms
US3568857A (en) * 1969-07-03 1971-03-09 Russell George Altherr Coupler keyslot bearing contour

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2889940A (en) * 1955-06-20 1959-06-09 Nat Malleable & Steel Castings Railway draft rigging
US2973103A (en) * 1959-05-22 1961-02-28 American Steel Foundries Coupler bearing block assembly
US3402825A (en) * 1966-12-07 1968-09-24 Cushion Coupler Corp Railway cars provided with draft riggings incorporating shock-ab-sorbing mechanisms
US3568857A (en) * 1969-07-03 1971-03-09 Russell George Altherr Coupler keyslot bearing contour

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3888358A (en) * 1974-07-25 1975-06-10 Halliburton Co Coupling assembly
US5096075A (en) * 1989-05-17 1992-03-17 Mcconway & Torley Corporation Slackless drawbar with gravity responsive wedge
US6446820B1 (en) * 2000-09-07 2002-09-10 Amsted Industries Incorporated Railcar draft gear assembly and system

Also Published As

Publication number Publication date
ES198012Y (es) 1975-11-16
CA935788A (en) 1973-10-23
GB1294434A (en) 1972-10-25
ES198012U (es) 1975-06-01
ZA713353B (en) 1972-02-23
BE769171A (fr) 1971-12-28

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Legal Events

Date Code Title Description
AS Assignment

Owner name: AMSTED INDUSTRIES INCORPORATED, A CORP. OF DE., IL

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:FIRST NATIONAL BANK OF CHICAGO, AS AGENT;REEL/FRAME:005070/0731

Effective date: 19880831