US3568857A - Coupler keyslot bearing contour - Google Patents

Coupler keyslot bearing contour Download PDF

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US3568857A
US3568857A US838776A US3568857DA US3568857A US 3568857 A US3568857 A US 3568857A US 838776 A US838776 A US 838776A US 3568857D A US3568857D A US 3568857DA US 3568857 A US3568857 A US 3568857A
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coupler
keyslot
arcs
bearing surface
shank
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US838776A
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Russell George Altherr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61G—COUPLINGS; DRAUGHT AND BUFFING APPLIANCES
    • B61G9/00—Draw-gear
    • B61G9/20—Details; Accessories
    • B61G9/24—Linkages between draw-bar and framework

Definitions

  • An improved keyslot bearing contour for a railroad coupler shank is disclosed.
  • the keyslot contour comprises a plurality of arcs which are designed to minimize localized bearing on the keyslot during angular pull of the coupler.
  • the improved keyslot contour is formed by a first are, rearwardly extending towards the butt end of the coupler, which terminates in a plurality of second arcs located at each side of the coupler in proximity to the intersection of the keyslot with the side walls of the coupler.
  • This invention relates generally to railroad couplers and more particularly to an improved coupler keyslot bearing contour which minimizes localized keyslot bearing during angular pulling on the coupler.
  • the key bearing surface of the coupler is generally cylindrical shaped and is located with its axis perpendicular to the longitudinal axis of the coupler shank. Under service buffing conditions the load on the coupler is transmitted through the butt end of the coupler with the key remaining unloaded.
  • the load is transmitted to the yoke and draft gear through the key.
  • this load is distributed over the entire length of the cylindrical key bearing surface.
  • the key is also angled in the coupler shank keyslot resulting in the load being transmitted on a corner of SUMMARY OF THE INVENTION.
  • coupler shank which provides substantially constant stress patterns to minimize localized bearing on the keyslot bearing surface during angular pull on the coupler.
  • Another object of the invention is to provide new and novel improved coupler keyslot bearing contour having an improved bearing surface by means of the use of a plurality of intersecting arcs formed in the keyslot.
  • FIG. 1 is a plan view, shown partially in section, of a standard-type railroad E-coupler in a horizontally angled buffing position;
  • FIG. 2 is a plan view, shown partially in section, of a standard-type railroad E-coupler in a horizontally angled pulling position;
  • FIG. 3 is a partial sectional view of the butt end of the coupler shank showing one embodiment of the improved keyslot bearing contour of the invention
  • FIG. 4 is an enlarged sectional view of FIG. 3 showing the intersection of the keyslot bearing surface with the side walls of the coupler shank;
  • FIG. 5 is a side elevational view of the butt end of the coupler shank showing the keyslot of FIG. 3 with the means for forming a plurality of hereinafter described second arcs.
  • FIG. 6 is an enlarged sectional view of a modification of the improved keyslot bearing contour of the invention.
  • a standard-type railroad E-coupler which comprises a coupler head 12 having attached thereto a coupler shank 14 which terminates at the butt end 16 of the coupler 10.
  • the butt end 16 of the coupler 10 contains a horizontal keyslot 18 designed to receive a load transmitting key 20.
  • the coupler load is transmitted through the butt end 16 to the follower and draft gear 22 contained rearwardly of the coupler 10.
  • the key 20 remains unloaded, as shown in FIG. 1, with no buffing contact load between the keyslot 18 and 20.
  • FIG. 2 there is shown the standard coupler under pulling conditions wherein the coupler load is transmitted to the yoke and draft gear through the key 20 by means of the keyslot bearing surface 24.
  • the coupler load is distributed over the entire bearing surface 24.
  • a horizontal angling of the coupler results in angularity of the key 20 in the coupler keyslot 18.
  • the coupler load is then transmitted on the corner 26 of the keyslot 18 at the location where the keyslot l8 intersects the sidewall 28 of the coupler 10 resulting in a severe peening of the comer 26 which may cause cracks and material failures to occur at this portion of the keyslot.
  • FIG. 3 of the drawings there is shown the improved coupler keyslot bearing contour of the invention which comprises a first are 30 formed rearwardly towards the butt end 16 of thecoupler 10.
  • the first are 30 terminates in a plurality of second arcs, shown generally as the numeral 32, which terminate tangent to the sidewalls 28 of the coupler shank 14.
  • the first are 30 forming the key bearing surface of the keyslot 18 may be formed as an inner arc of a toroid having a radius lying rearwardly from the butt end 16 of the coupler shank 14.
  • a radius of substantially 50 inches would encompass the normal range of the coupler angling to provide a substantially constant stress pattern in the bearing surfaces to the corner 26.
  • FIG. 4 there is shown in an enlarged sectional view one of the plurality of second arcs 32 shown in FIG. 5 of the drawings, at the respective sidewalls 28 of the coupler shank 14.
  • the second arcs 32 are formed in this manner, the possibility of undercutting of the sidewalls is eliminated should the keyslot core shift along its axis during the pouring process.
  • the grooves 36 are completed by a plurality of radii 38 terminating at the sidewalls 28 of the coupler shank 14.
  • a preferred dimension for radius 34 would be substantially three-eight of an inch and preferred dimension for the radius 38 would be substantially 1 inch.
  • the surface may also be formed in the shape of other rearwardly extending first arcs, such as an elliptic segment, a parabolic segment or a hyperbolic segment, to name a few, all of which would terminate in he plurality of second arcs 32 without departing from the spirit and scope of the invention.
  • first arcs such as an elliptic segment, a parabolic segment or a hyperbolic segment, to name a few, all of which would terminate in he plurality of second arcs 32 without departing from the spirit and scope of the invention.
  • FIG. 6 there is shown a modification of the improved keyslot bearing contour of the invention wherein the second arcs of the invention are formed by the radii 41), one of which is located on each side of the coupler keyslot.
  • the radii d0 forms the second arcs of the invention and initiate at the termination of the first arc 30 and terminate tangent to a line parallel to the coupler sidewall 28, said line lying outside the coupler sidewall.
  • the plurality of grooves shown in the embodiment of FIGS. 3, i and 5 would not be used and in place thereof would be formed a small amount of metal 42 outside of the sidewall 28 that could be removed by grinding.
  • the amount of the metal 42 is sufficient to accommodate tolerances necessary in setting the core without obtaining excessive undercut of the sidewall 28 in case the keyslot core shifts along its axis during the pouring process. it has been found that when the radius 40 is approximately three eight of an inch that the maximum undercut of the sidewall 28 will be one-sixteenth of an inch.
  • the key bearing surface being formed in the shape of a rearwardly extending first arc
  • said first arc comprises an inner arc of a toroid having a radius lying rearwardly from the butt end of the shank.
  • the improvement comprising the key bearing surface being formed in the shape of a rearwardly extending elliptic segment terminating in a plurality of second arcs at the intersection of the sidewalls and the key bearing surface for minimizing the localized bearing on the keyslot during angular coupler pull.
  • each of said second arcs are formed by a vertical groove formed in the related sidewall and located at the intersection of the key bearing surface and the related sidewall.
  • each of said second arcs is defined at a portion thereof rearwardly of said segment by a pair of radii and is defined forwardly of said segment by another pair of radii longer than said first-mentioned radii.
  • the key bearing surface being formed in the shape of a rearwardly extending first arc
  • said first arc comprises an inner arc of a toroid having a radius lying rearwardly from the butt end of the shank.
  • the improvement comprising the key bearing surface being formed in the shape of a rearwardly extending elliptic segment terminating in at least two second arcs, located on each side of the coupler sidewall, said second arcs terminating tangent to a line which lies parallel to the coupler sidewall and outside of the sidewall, said first and second arcs serving to minimize the localized bearing on the keyslot during angular coupler pull.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

An improved keyslot bearing contour for a railroad coupler shank is disclosed. The keyslot contour comprises a plurality of arcs which are designed to minimize localized bearing on the keyslot during angular pull of the coupler. The improved keyslot contour is formed by a first arc, rearwardly extending towards the butt end of the coupler, which terminates in a plurality of second arcs located at each side of the coupler in proximity to the intersection of the keyslot with the side walls of the coupler.

Description

I United States Patent l 13,568,857
[72] Inventor Russell GeorgeAltherr [56] I References Cited 10005 Prudential Pl za, h g UNITED STATES PATENTS 6060! 1,609,166 11/1926 l-laseltine 213/64 1 rm- 838,776 2,019,311 10/1935 Kinne 213/50 1 PM Y 2,724,513 11/1955 Willison... 213/50 1 Patented Mar-19,19 1 2,889,939 6/1959 Metzger 213/64 [54] COUPLER KEYSLOT BEARING CONTOUR [50] Field of Search Primary Examiner-Drayton E. Hoffman Attorneys-Walter L. Schlegel, Jr. and Norvell Von Behren ABSTRACT: An improved keyslot bearing contour for a railroad coupler shank is disclosed. The keyslot contour comprises a plurality of arcs which are designed to minimize localized bearing on the keyslot during angular pull of the coupler. The improved keyslot contour is formed by a first are, rearwardly extending towards the butt end of the coupler, which terminates in a plurality of second arcs located at each side of the coupler in proximity to the intersection of the keyslot with the side walls of the coupler.
COUPLER KEYSLOT BEARHNIG CONTOUR BACKGROUND OF THE INVENTION This invention relates generally to railroad couplers and more particularly to an improved coupler keyslot bearing contour which minimizes localized keyslot bearing during angular pulling on the coupler.
In a standard railroad-type Ecoupler having a horizontal key, the key bearing surface of the coupler is generally cylindrical shaped and is located with its axis perpendicular to the longitudinal axis of the coupler shank. Under service buffing conditions the load on the coupler is transmitted through the butt end of the coupler with the key remaining unloaded.
Under service pulling conditions, the load is transmitted to the yoke and draft gear through the key. When the coupler is straight, this load is distributed over the entire length of the cylindrical key bearing surface. However, when the coupler is horizontally angled, the key is also angled in the coupler shank keyslot resulting in the load being transmitted on a corner of SUMMARY OF THE INVENTION The present invention overcomes the beforementioned difficulties and limitations by providing an improved coupler keyslot bearing surface which minimizes the localized bearing on the keyslot bearing surface during an angular pull on the coupler.
Accordingly, it is the object of the invention to provide a new and novel improved coupler keyslot bearingcontour for a railroad. coupler shank which provides substantially constant stress patterns to minimize localized bearing on the keyslot bearing surface during angular pull on the coupler.
Another object of the invention is to provide new and novel improved coupler keyslot bearing contour having an improved bearing surface by means of the use of a plurality of intersecting arcs formed in the keyslot.
These and other objects and advantages of the invention will become apparent from a study of the attached drawings and from a reading of the description of the preferred embodiment.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view, shown partially in section, of a standard-type railroad E-coupler in a horizontally angled buffing position;
FIG. 2 is a plan view, shown partially in section, of a standard-type railroad E-coupler in a horizontally angled pulling position;
FIG. 3 is a partial sectional view of the butt end of the coupler shank showing one embodiment of the improved keyslot bearing contour of the invention;
FIG. 4 is an enlarged sectional view of FIG. 3 showing the intersection of the keyslot bearing surface with the side walls of the coupler shank; and
FIG. 5 is a side elevational view of the butt end of the coupler shank showing the keyslot of FIG. 3 with the means for forming a plurality of hereinafter described second arcs.
FIG. 6 is an enlarged sectional view of a modification of the improved keyslot bearing contour of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now more particularly to the drawings, there is shown generally at 10 a standard-type railroad E-coupler which comprises a coupler head 12 having attached thereto a coupler shank 14 which terminates at the butt end 16 of the coupler 10. The butt end 16 of the coupler 10 contains a horizontal keyslot 18 designed to receive a load transmitting key 20. When the coupler 10 is under the buffing condition, as shown in FIG. 1, the coupler load is transmitted through the butt end 16 to the follower and draft gear 22 contained rearwardly of the coupler 10. In such a condition, the key 20 remains unloaded, as shown in FIG. 1, with no buffing contact load between the keyslot 18 and 20.
Referring now to FIG. 2 there is shown the standard coupler under pulling conditions wherein the coupler load is transmitted to the yoke and draft gear through the key 20 by means of the keyslot bearing surface 24. When the pull on the coupler is straight, the coupler load is distributed over the entire bearing surface 24. However, a horizontal angling of the coupler, as shown in FIG. 2,, results in angularity of the key 20 in the coupler keyslot 18. Under such conditions, the coupler load is then transmitted on the corner 26 of the keyslot 18 at the location where the keyslot l8 intersects the sidewall 28 of the coupler 10 resulting in a severe peening of the comer 26 which may cause cracks and material failures to occur at this portion of the keyslot.
Referring now to FIG. 3 of the drawings there is shown the improved coupler keyslot bearing contour of the invention which comprises a first are 30 formed rearwardly towards the butt end 16 of thecoupler 10. The first are 30 terminates in a plurality of second arcs, shown generally as the numeral 32, which terminate tangent to the sidewalls 28 of the coupler shank 14. The first are 30 forming the key bearing surface of the keyslot 18 may be formed as an inner arc of a toroid having a radius lying rearwardly from the butt end 16 of the coupler shank 14.
In the embodiment shown a radius of substantially 50 inches would encompass the normal range of the coupler angling to provide a substantially constant stress pattern in the bearing surfaces to the corner 26.
Referring now to FIG. 4 in particular, there is shown in an enlarged sectional view one of the plurality of second arcs 32 shown in FIG. 5 of the drawings, at the respective sidewalls 28 of the coupler shank 14. When the second arcs 32 are formed in this manner, the possibility of undercutting of the sidewalls is eliminated should the keyslot core shift along its axis during the pouring process.
In the embodiment shown in FIG. 4 the grooves 36 are completed by a plurality of radii 38 terminating at the sidewalls 28 of the coupler shank 14. A preferred dimension for radius 34 would be substantially three-eight of an inch and preferred dimension for the radius 38 would be substantially 1 inch.
In addition to the toroidal shape of the key bearing surface 24 of the invention, the surface may also be formed in the shape of other rearwardly extending first arcs, such as an elliptic segment, a parabolic segment or a hyperbolic segment, to name a few, all of which would terminate in he plurality of second arcs 32 without departing from the spirit and scope of the invention. When the key bearing surface is provided with the toroidal shaped are or other arcs having rearwardly extending configurations, it can be seen that improved coupler performance is obtained during pulling conditions resulting in providing more bearing area at the corner 26 of the keyslot 1% thereby providing for coupler angularity.
Referring now to FIG. 6 there is shown a modification of the improved keyslot bearing contour of the invention wherein the second arcs of the invention are formed by the radii 41), one of which is located on each side of the coupler keyslot. The radii d0 forms the second arcs of the invention and initiate at the termination of the first arc 30 and terminate tangent to a line parallel to the coupler sidewall 28, said line lying outside the coupler sidewall.
When the second arcs are formed in this manner the plurality of grooves shown in the embodiment of FIGS. 3, i and 5 would not be used and in place thereof would be formed a small amount of metal 42 outside of the sidewall 28 that could be removed by grinding. The amount of the metal 42 is sufficient to accommodate tolerances necessary in setting the core without obtaining excessive undercut of the sidewall 28 in case the keyslot core shifts along its axis during the pouring process. it has been found that when the radius 40 is approximately three eight of an inch that the maximum undercut of the sidewall 28 will be one-sixteenth of an inch.
From the foregoing it can be seen that an improved new and novel coupler keyslot bearing contour, as shown in the embodiment of FIG. 3 or the modification of FIG. 6, has been provided, which minimizes the localized bearing on the keyslot bearing surface during an angular pull on the coupler. This has been accomplished by the novel use of a first arc and a plurality of second arcs formed in the manner hereinbefore described. While all of the objects and advantages of the invention have been provided for in the embodiment and modification shown, it is apparent that many changes in details of construction may be made without departing from the spirit and scope of the invention, which is expressed in the accompanying claims and the invention is not to be limited to he exact matters shown and described since only the preferred embodiment has been given by way of illustration only.
lclaim:
l. in a railroad coupler shank of the type having a horizontal keyslot forming a key bearing surface through the butt end of the coupler shank, the improvement comprising:
a. the key bearing surface being formed in the shape of a rearwardly extending first arc; and
b. a plurality of second arcs tangent to the coupler shank walls and said first are and formed at the intersection of said first arc and the coupler sidewalls, said first and second arcs serving to minimize the localized bearing on the keyslot of the coupler shank during angular pull of the coupler.
2. The improvement as defined in claim 1 wherein said first arc comprises an inner arc of a toroid having a radius lying rearwardly from the butt end of the shank.
3. The improvement as defined in claim 1 wherein said second arcs are formed by means of the sidewalls having formed therein a plurality of vertical grooves extending the height of the sidewalls and located at the intersection of said first arc and the sidewalls.
4. In a railroad coupler shank of the type having a horizontal keyslot forming a key bearing surface through the butt end of the coupler shank, the improvement comprising the key bearing surface being formed in the shape of a rearwardly extending elliptic segment terminating in a plurality of second arcs at the intersection of the sidewalls and the key bearing surface for minimizing the localized bearing on the keyslot during angular coupler pull.
5. The improvement as defined in claim 4 wherein each of said second arcs are formed by a vertical groove formed in the related sidewall and located at the intersection of the key bearing surface and the related sidewall.
6. The improvement as defined in claim 4, wherein each of said second arcs is defined at a portion thereof rearwardly of said segment by a pair of radii and is defined forwardly of said segment by another pair of radii longer than said first-mentioned radii.
7. In a railroad coupler shank of the type having a horizontal keyslot forming a key bearing surface through the butt end of the coupler shank, the improvement comprising:
a. the key bearing surface being formed in the shape of a rearwardly extending first arc; and
b. a plurality of second arcs initiated at the termination of said first arc and terminating tangent to a line parallel to the coupler sidewall, said line lying outside of the sidewall, said first and second arcs serving to minimize the localized bearing on the keyslot of the coupler shank during angular pull of the coupler.
8. The improvement as defined in claim 7 wherein said first arc comprises an inner arc of a toroid having a radius lying rearwardly from the butt end of the shank.
. In a railroad coupler shank of type having a horizontal keyslot forming a key bearing surface through the butt end of the coupler shank, the improvement comprising the key bearing surface being formed in the shape of a rearwardly extending elliptic segment terminating in at least two second arcs, located on each side of the coupler sidewall, said second arcs terminating tangent to a line which lies parallel to the coupler sidewall and outside of the sidewall, said first and second arcs serving to minimize the localized bearing on the keyslot during angular coupler pull.

Claims (9)

1. In a railroad coupler shank of the type having a horizontal keyslot forming a key bearing surface through the butt end of the coupler shank, the improvement comprising: a. the key bearing surface being formed in the shape of a rearwardly extending first arc; and b. a plurality of second arcs tangent to the coupler shank walls and said first arc and formed at the intersection of said first arc and the coupler sidewalls, said first and second arcs serving to minimize the localized bearing on the keyslot of the coupler shank during angular pull of the coupler.
2. The improvement as defined in claim 1 wherein said first arc comprises an inner arc of a toroid having a radius lying rearwardly from the butt end of the shank.
3. The improvement as defined in claim 1 wherein said second arcs are formed by means of the sidewalls having formed therein a plurality of vertical grooves extending the height of the sidewalls and located at the intersection of said first arc and the sidewalls.
4. In a railroad coupler shank of the type having a horizontal keyslot forming a key bearing surface through the butt end of the coupler shank, the improvement comprising the key bearing surface being formed in the shape of a rearwardly extending elliptic segment terminating in a plurality of second arcs at the intersection of the sidewalls and the key bearing surface for minimizing the localized bearing on the keyslot during angular coupler pull.
5. The improvement as defined in claim 4 wherein each of said second arcs are formed by a vertical groove formed in the related sidewall and located at the intersection of the key bearing surface and the related sidewall.
6. The improvement as defined in claIm 4, wherein each of said second arcs is defined at a portion thereof rearwardly of said segment by a pair of radii and is defined forwardly of said segment by another pair of radii longer than said first-mentioned radii.
7. In a railroad coupler shank of the type having a horizontal keyslot forming a key bearing surface through the butt end of the coupler shank, the improvement comprising: a. the key bearing surface being formed in the shape of a rearwardly extending first arc; and b. a plurality of second arcs initiated at the termination of said first arc and terminating tangent to a line parallel to the coupler sidewall, said line lying outside of the sidewall, said first and second arcs serving to minimize the localized bearing on the keyslot of the coupler shank during angular pull of the coupler.
8. The improvement as defined in claim 7 wherein said first arc comprises an inner arc of a toroid having a radius lying rearwardly from the butt end of the shank.
9. In a railroad coupler shank of type having a horizontal keyslot forming a key bearing surface through the butt end of the coupler shank, the improvement comprising the key bearing surface being formed in the shape of a rearwardly extending elliptic segment terminating in at least two second arcs, located on each side of the coupler sidewall, said second arcs terminating tangent to a line which lies parallel to the coupler sidewall and outside of the sidewall, said first and second arcs serving to minimize the localized bearing on the keyslot during angular coupler pull.
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3635358A (en) * 1970-09-02 1972-01-18 Amsted Ind Inc Coupler arrangement
US3635357A (en) * 1970-08-10 1972-01-18 Amsted Ind Inc Modified pinhole for railway couplers
US3635356A (en) * 1970-12-16 1972-01-18 Amsted Ind Inc Railway coupler butt
US3858729A (en) * 1973-04-11 1975-01-07 Amsted Ind Inc Railway coupler shank keyslot contour
US3876081A (en) * 1973-10-10 1975-04-08 Midland Ross Corp Railway draft rigging
USRE29011E (en) * 1973-04-11 1976-10-26 Amsted Industries Incorporated Railway Coupler Shank Keyslot Contour

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1609166A (en) * 1923-10-11 1926-11-30 Miner Inc W H Railway draft rigging
US2019311A (en) * 1929-11-25 1935-10-29 American Steel Foundries Draft gear
US2724513A (en) * 1952-02-12 1955-11-22 Nat Malleable & Steel Castings Railway draft rigging
US2889939A (en) * 1957-07-16 1959-06-09 Nat Malleable & Steel Castings Car coupler

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1609166A (en) * 1923-10-11 1926-11-30 Miner Inc W H Railway draft rigging
US2019311A (en) * 1929-11-25 1935-10-29 American Steel Foundries Draft gear
US2724513A (en) * 1952-02-12 1955-11-22 Nat Malleable & Steel Castings Railway draft rigging
US2889939A (en) * 1957-07-16 1959-06-09 Nat Malleable & Steel Castings Car coupler

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3635357A (en) * 1970-08-10 1972-01-18 Amsted Ind Inc Modified pinhole for railway couplers
US3635358A (en) * 1970-09-02 1972-01-18 Amsted Ind Inc Coupler arrangement
US3635356A (en) * 1970-12-16 1972-01-18 Amsted Ind Inc Railway coupler butt
US3858729A (en) * 1973-04-11 1975-01-07 Amsted Ind Inc Railway coupler shank keyslot contour
USRE29011E (en) * 1973-04-11 1976-10-26 Amsted Industries Incorporated Railway Coupler Shank Keyslot Contour
US3876081A (en) * 1973-10-10 1975-04-08 Midland Ross Corp Railway draft rigging

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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