US3834320A - Sprung mounted snubber wear plate - Google Patents

Sprung mounted snubber wear plate Download PDF

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US3834320A
US3834320A US00321131A US32113173A US3834320A US 3834320 A US3834320 A US 3834320A US 00321131 A US00321131 A US 00321131A US 32113173 A US32113173 A US 32113173A US 3834320 A US3834320 A US 3834320A
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plate
column
wear
bolts
wear plate
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US00321131A
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C Tack
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TransDyne Inc
TRANS DYNE Inc
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TransDyne Inc
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Priority to CA188,959A priority patent/CA989672A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
    • B61F5/00—Constructional details of bogies; Connections between bogies and vehicle underframes; Arrangements or devices for adjusting or allowing self-adjustment of wheel axles or bogies when rounding curves
    • B61F5/02—Arrangements permitting limited transverse relative movements between vehicle underframe or bolster and bogie; Connections between underframes and bogies
    • B61F5/04—Bolster supports or mountings
    • B61F5/12—Bolster supports or mountings incorporating dampers
    • B61F5/122—Bolster supports or mountings incorporating dampers with friction surfaces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body

Definitions

  • a sprung wear plate particularly useful for reliable sel l05/197 7 29/522, cure application to the side frame columns of a rail- 105/19 105/20 188/250 G waytruck is made from a single metal strip having a 1111- Cl 1361f 1361f F16d 69/04 concave surface facing the flat mounting surface on Field of Search 197 the side frame column.
  • the plate has holes for attach- 1 7 188/250 G ment by bolts through aligned holes in the column.
  • High strength bolts are used such that tightening of 1 References Cited the bolts flattens out the concave surface of plate into UNITED STATES PATENTS full contact with the column locking the bolts therein. 1,939,553 12/1933
  • the bolts preferably have tapered heads received in 2,169,715 3/1939 tapered holes in the plates to prevent accidental appli- 2,237,953 4 1941 cation of the plates with the concave surface facing 3,230,152 H1966 outwardly.
  • Wear plates are employed in railway and other industries as a replaceable part that is subject to friction, rubbing or abrasion from another part.
  • a wear plate is beneficially used on a large or expensive casting having one or more surfaces that are exposed to frictional deterioration. By securing a removable wear plate over such exposed surfaces, any wear will be confined to the plate and not to the casting, thereby extending the life of the casting indefinitely with the simple replacement of wear plates.
  • a long unresolved problem in the railway industry is a reliable means of securing a wear plate to the side frame column without the plate becoming loose under service conditions.
  • the side frames of a railway truck have windows therein for receiving the ends of a bolster, with the ends of the bolster being supported upon springs in the side frame.
  • the bolster carries a friction shoe on both sides that is urged by a spring against a vertical column located at each side of the side frame window. Frictional engagement of the friction shoe against the column locking the bolts therein serves to dampen sudden vertical movement of the bolster, which in turn stabilizes the travel or ride of therailway vehicle.
  • the wear plate is curved or shaped into a predetermined form prior to its application to the side frame column. I have found that the wear plate becomes loose because the allowable tolerance may permit only partial contact and may result in a situation where the facing surface of the plate is spaced from the column surface in one or more areas. Under heavy pressure, the plate is able to flex slightly, which eventually causes wearing of contacting surfaces or loosening of the bolts or other securement means.
  • the present invention provides a wear plate which is initially formed with a concave surface facing the side frame column.
  • the concavity of the plate or plate surface is designed to be greater than any normal or abnormal variation from flatness in the column surface, in order to assure that the central portion of the plate surface will be initially spaced from the column surface while .the outer perimeter of the plate surface will contact the column surface.
  • the central portion of the plate surface is then drawn into full contact with the column surface with heavy threaded bolts and nuts passing through the plate and column. Since the plate has characteristics of a spring, two heavy bolts are employed and are-alternately tightened until the spring force of the plate ismet or exceeded and the central portion of the plate fully engages the column. I Upon application, the wear plate takes advantage of the spring forces generated during its attachment, and the edges of the plate conform to any variation from flatness in the column surface. Loads on the wear plate therefore tend to be distributed evenly, and the tendency of the plate to flex or rock on the column'is greatly minimized.
  • FIG. 3 is 'a'fragmentary sectional. view taken along section line 33 of FIG. 1;
  • FIG. 4 is a fragmentary sectional view taken substantially along section line 4-4 of FIG. 1.
  • the principles of the present invention will be described in connection with a friction plate l0'adapted to be mounted on a side frame 12 of a railway truck as shown in FIG. 1, but it shall be understood that the invention has applicability to other-forms of plates secured in other locations, as will be readily apparent to those skilled in this and related arts.
  • the side frame 12 is conventional in nature and generally comprises an upper compression member 14 and alower tension member 16 having a spring seat 18 formed therein for support of spring groups that resiliently support the end of the bolster (not shown).
  • a vertical column 20 extends between the tension and compression members and has an inwardly facing surface 22 upon which the friction plate 10 is supported and carried. Spaced lugs 24 may be provided on the column surface to locate and maintain the friction plate in proper position on the column.
  • a second column is connected between the compression and tension members in parallel relation to the first, and the second column is also provided with an inwardly facing surface carrying a friction plate.
  • the friction plates in each side frame therefore face one another and serve as frictional surfaces for sliding engagement by friction shoes carried by the bolster.
  • the column surface 22 is designed to be substantially flat within standard tolerances established by the industry.
  • the friction plate is provided with a curved configuration, with the surface 36 facing the column surface 22 having a concave curvature.
  • a pair of vertically spaced apertures 26 are provided in the generally rectangular plate 20 for attachment by bolts 28 and nuts 30 to the side frame column.
  • the apertures are countersunk or tapered inwardly at 32 from the outwardly facing surface 34 of the plate, and the heads of the bolts 28 are similarly tapered but of less width than the length of the tapered areas 32, such that the head of the bolt, when seated, will be spaced inward from the outer surface 34.
  • the friction plates of the present invention are preferably made from resilient steel plate or strip stock.
  • the strength and wear characteristics of the metal are improved by heating and quenching, with subsequent heating to a lower temperature to control hardness. These procedures are commonly employed by the industry in the manufacture of flat plates, all of which steps make it difficult, if not impossible to achieve and hold a small tolerance on flatness.
  • the friction plates are given the desired degree of curvature as shown during or after routine processing. Curvature may be imparted to the plate while hot by forming on a die, or. a shaping die may be employed while the apertures 26 are being punched. In the alternative, after final tempering the plate may be shotpeened on one side, which will cause it to curl in the desired amount and direction. Other well known methods may be employed to achieve the same result, and the above should be considered as only exemplary.
  • An important feature of the present invention is the means by which proper and fool-proof installation of the friction plate is achieved. Installation with the concave surface facing outwardly would defeat the purpose of the invention. For this reason, the apertures 26 taper inward from the convex outer surface 34, and this feature assures that the concave surface 36 will also face the column upon installation.
  • the ends of the present invention may be achieved if the plate is formed with curvature about either a vertical or horizontal axis, or with a compound curvature, but in the preferred embodiment, the plate is formed with a spherical curvature as shown in FIGS. 3 and 4.
  • the plate may be curved along its entire width, or the majority of the curvature may be confined to the central portion of the plate, with the outer perimeter of the surface being substantially flat. In the case of wear plates for columns, a spherical radius between about 9 to about 15 inches, preferably in the order of about 12 inches, will be sufficient to achieve the desired degree of curvature.
  • the friction plate will generally measure 8 to 10 inches long, 4 to 7 inches wide, and approximately A; to inches thick.
  • the degree of curvature should in any event be greater than the maximum convex curvature expected in the facing part, such that the central portion of the plate will be spaced from the facing surface before the bolts are tightened.
  • FIGS. 3 and 4 The relation of the wear plate to the column is shown in FIGS. 3 and 4, and it may be seen that the central portion of the plate is slightly spaced from the facing column surface with the bolts applied but not tight. The bolts are then tightened alternately until the central portion of the plate is drawn up against the column surface.
  • the apertures 26 must be located toward the center of the plate in order to assure deflection when the nuts are tightened. It will be understood that a sufficiently heavy bolt must be employed to fully deflect the plate into contact position. We have found that a 34 by 2 inch grade 8 bolt having a high strength self-locking nut which is torqued to 175 to 200 ft. -lbs., will fully deflect the plate, although bolts of lower grades might possibly be used.
  • each side frame comprising vertical columns with wear plates secured on the inwardly facing surfaces thereof, said column surfaces being substantially flat
  • the wear plate has a concave shape relative to and facing said column surface, and securement means for securing and deflecting said plate into substantially full contact with said surface, said wear plate, upon securement, being spring-loaded against said column surface.
  • said securement means comprise vertically spaced threaded fasteners secured through apertures in said plate and column.
  • Wear means adapted to be secured against the surface of a support comprising a resilient metal wear plate having a surface facing said support surface, which, when in unstressed engagement therewith, is concave relative thereto with a central portion of said plate surface being spaced from said support surface, and securement means for drawing said central portion substantially against said support surface, said wear plate, upon securement, being spring loaded against said support surface.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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Abstract

A sprung wear plate particularly useful for reliable secure application to the side frame columns of a railway truck is made from a single metal strip having a concave surface facing the flat mounting surface on the side frame column. The plate has holes for attachment by bolts through aligned holes in the column. High strength bolts are used such that tightening of the bolts flattens out the concave surface of plate into full contact with the column locking the bolts therein. The bolts preferably have tapered heads received in tapered holes in the plates to prevent accidental application of the plates with the concave surface facing outwardly.

Description

United States Patent 1191 [111 3,834,320
Tack 1451 Sept. 10,1974
[ 1 SPRUNG MOUNTED SNUBBER WEAR 3,714,905 2/1973 Barber 105/197 DB PLATE Primary Examiner-M. Henson Wood, Jr. [75] Inventor. Carl E. Tack, Elmhurst, 11]. Assistant Examiner Howard Beltran [73] Assignee: Trans Dyne, Inc., Chicago, Ill. Attorney, Agent, or Firm-Gary, Juettner, Pigott & 22 Filed: Jan. 5, 1973 Gunman [21] App]. No.: 321,131 I 57 ABSTRACT I A sprung wear plate particularly useful for reliable sel l05/197 7 29/522, cure application to the side frame columns of a rail- 105/19 105/20 188/250 G waytruck is made from a single metal strip having a 1111- Cl 1361f 1361f F16d 69/04 concave surface facing the flat mounting surface on Field of Search 197 the side frame column. The plate has holes for attach- 1 7 188/250 G ment by bolts through aligned holes in the column.
' High strength bolts are used such that tightening of 1 References Cited the bolts flattens out the concave surface of plate into UNITED STATES PATENTS full contact with the column locking the bolts therein. 1,939,553 12/1933 The bolts preferably have tapered heads received in 2,169,715 3/1939 tapered holes in the plates to prevent accidental appli- 2,237,953 4 1941 cation of the plates with the concave surface facing 3,230,152 H1966 outwardly. 3,362,449 l/1968 3,548,754 12/1970 Williams 105/197 D a 7 Chims, 4 Drawing Figures SPRUNG MOUNTED SNUBBER WEAR PLATE BACKGROUND OF THE INVENTION Wear plates are employed in railway and other industries as a replaceable part that is subject to friction, rubbing or abrasion from another part. A wear plate is beneficially used on a large or expensive casting having one or more surfaces that are exposed to frictional deterioration. By securing a removable wear plate over such exposed surfaces, any wear will be confined to the plate and not to the casting, thereby extending the life of the casting indefinitely with the simple replacement of wear plates. I
A long unresolved problem in the railway industry is a reliable means of securing a wear plate to the side frame column without the plate becoming loose under service conditions. In that application, the side frames of a railway truck have windows therein for receiving the ends of a bolster, with the ends of the bolster being supported upon springs in the side frame. The bolster carries a friction shoe on both sides that is urged by a spring against a vertical column located at each side of the side frame window. Frictional engagement of the friction shoe against the column locking the bolts therein serves to dampen sudden vertical movement of the bolster, which in turn stabilizes the travel or ride of therailway vehicle.
Since the side frame is a heavy and relatively expensive member, friction plates are commonly secured against the side frame columns to confine frictional wear to the plates and prevent permanent damage to the side frame. Various methods have been proposed to secure the wear plates, including welding. and bolt-' ing, but none of these methods alone have proven to be successful in achieving permanent securement for all side frames and service conditions. Under service conditions, especially with the advent of heavier and faster vehicles, a welded joint tends to develop cracks and may eventually break. Bolted connections, including both threaded connections and lockbolts applied with an impact device, have failed to adequately solve the problem since in many instances the wear plates'become loose after a period of time.
The experience within the railway industry indicates that it would be desirable to devise a highly reliable and yet inexpensive means for securing wear plates in such a manner that they would not become loose or fall off under severe and continued service conditions. The loosening of a friction plate can result in various problems, the most serious of which are permanent damage to the columns or friction shoes, or in case of a lost plate, loss of ride control in the truck.
Existing wear plates are required by A.A.R. standards to be flat, with a possible tolerance in either direction of 0.025 inches. The cast column surfaces to which the wear plates are attached are also designed to be flat, but experience has shown that such surfaces may vary from 0.025 inches concave to 0.010 inches convex. All efforts have been directed to establishing a flat, smooth interface to achieve full contact between the facing members before they are secured together.
SUMMARY OF THE INVENTION In accordance with the present invention, the wear plate is curved or shaped into a predetermined form prior to its application to the side frame column. I have found that the wear plate becomes loose because the allowable tolerance may permit only partial contact and may result in a situation where the facing surface of the plate is spaced from the column surface in one or more areas. Under heavy pressure, the plate is able to flex slightly, which eventually causes wearing of contacting surfaces or loosening of the bolts or other securement means.
The present invention provides a wear plate which is initially formed with a concave surface facing the side frame column. The concavity of the plate or plate surface is designed to be greater than any normal or abnormal variation from flatness in the column surface, in order to assure that the central portion of the plate surface will be initially spaced from the column surface while .the outer perimeter of the plate surface will contact the column surface.
The central portion of the plate surface is then drawn into full contact with the column surface with heavy threaded bolts and nuts passing through the plate and column. Since the plate has characteristics of a spring, two heavy bolts are employed and are-alternately tightened until the spring force of the plate ismet or exceeded and the central portion of the plate fully engages the column. I Upon application, the wear plate takes advantage of the spring forces generated during its attachment, and the edges of the plate conform to any variation from flatness in the column surface. Loads on the wear plate therefore tend to be distributed evenly, and the tendency of the plate to flex or rock on the column'is greatly minimized.
THE DRAWINGS FIG. 3 is 'a'fragmentary sectional. view taken along section line 33 of FIG. 1; and
FIG. 4 is a fragmentary sectional view taken substantially along section line 4-4 of FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT The principles of the present invention will be described in connection with a friction plate l0'adapted to be mounted on a side frame 12 of a railway truck as shown in FIG. 1, but it shall be understood that the invention has applicability to other-forms of plates secured in other locations, as will be readily apparent to those skilled in this and related arts. The side frame 12 is conventional in nature and generally comprises an upper compression member 14 and alower tension member 16 having a spring seat 18 formed therein for support of spring groups that resiliently support the end of the bolster (not shown). A vertical column 20 extends between the tension and compression members and has an inwardly facing surface 22 upon which the friction plate 10 is supported and carried. Spaced lugs 24 may be provided on the column surface to locate and maintain the friction plate in proper position on the column.
Since only a portion of the truck is shown for the sake of brevity, it will be understood that a second column is connected between the compression and tension members in parallel relation to the first, and the second column is also provided with an inwardly facing surface carrying a friction plate. The friction plates in each side frame therefore face one another and serve as frictional surfaces for sliding engagement by friction shoes carried by the bolster.
As shown in FIGS. 2, 3 and 4, the column surface 22 is designed to be substantially flat within standard tolerances established by the industry. The friction plate, however, is provided with a curved configuration, with the surface 36 facing the column surface 22 having a concave curvature. A pair of vertically spaced apertures 26 are provided in the generally rectangular plate 20 for attachment by bolts 28 and nuts 30 to the side frame column. The apertures are countersunk or tapered inwardly at 32 from the outwardly facing surface 34 of the plate, and the heads of the bolts 28 are similarly tapered but of less width than the length of the tapered areas 32, such that the head of the bolt, when seated, will be spaced inward from the outer surface 34.
The friction plates of the present invention are preferably made from resilient steel plate or strip stock. The strength and wear characteristics of the metal are improved by heating and quenching, with subsequent heating to a lower temperature to control hardness. These procedures are commonly employed by the industry in the manufacture of flat plates, all of which steps make it difficult, if not impossible to achieve and hold a small tolerance on flatness.
In addition to the foregoing, the friction plates are given the desired degree of curvature as shown during or after routine processing. Curvature may be imparted to the plate while hot by forming on a die, or. a shaping die may be employed while the apertures 26 are being punched. In the alternative, after final tempering the plate may be shotpeened on one side, which will cause it to curl in the desired amount and direction. Other well known methods may be employed to achieve the same result, and the above should be considered as only exemplary.
An important feature of the present invention is the means by which proper and fool-proof installation of the friction plate is achieved. Installation with the concave surface facing outwardly would defeat the purpose of the invention. For this reason, the apertures 26 taper inward from the convex outer surface 34, and this feature assures that the concave surface 36 will also face the column upon installation.
The ends of the present invention may be achieved if the plate is formed with curvature about either a vertical or horizontal axis, or with a compound curvature, but in the preferred embodiment, the plate is formed with a spherical curvature as shown in FIGS. 3 and 4. The plate may be curved along its entire width, or the majority of the curvature may be confined to the central portion of the plate, with the outer perimeter of the surface being substantially flat. In the case of wear plates for columns, a spherical radius between about 9 to about 15 inches, preferably in the order of about 12 inches, will be sufficient to achieve the desired degree of curvature. The friction plate will generally measure 8 to 10 inches long, 4 to 7 inches wide, and approximately A; to inches thick. The degree of curvature should in any event be greater than the maximum convex curvature expected in the facing part, such that the central portion of the plate will be spaced from the facing surface before the bolts are tightened.
The relation of the wear plate to the column is shown in FIGS. 3 and 4, and it may be seen that the central portion of the plate is slightly spaced from the facing column surface with the bolts applied but not tight. The bolts are then tightened alternately until the central portion of the plate is drawn up against the column surface. The apertures 26 must be located toward the center of the plate in order to assure deflection when the nuts are tightened. It will be understood that a sufficiently heavy bolt must be employed to fully deflect the plate into contact position. We have found that a 34 by 2 inch grade 8 bolt having a high strength self-locking nut which is torqued to 175 to 200 ft. -lbs., will fully deflect the plate, although bolts of lower grades might possibly be used.
I claim:
1. In a railway truck having side frames, each side frame comprising vertical columns with wear plates secured on the inwardly facing surfaces thereof, said column surfaces being substantially flat, the improvement wherein the wear plate has a concave shape relative to and facing said column surface, and securement means for securing and deflecting said plate into substantially full contact with said surface, said wear plate, upon securement, being spring-loaded against said column surface.
2. The improvement of claim 1 wherein said securement means comprise vertically spaced threaded fasteners secured through apertures in said plate and column.
3. The improvement of claim 2 wherein said apertures and the heads of said bolts have similar tapered surfaces and said apertures receive said heads.
4. The improvement of claim 2 wherein said apertures are spaced inward from the sides of said plate.
5. The improvement of claim 1 wherein said wear plate is generally rectangular and said concave shape is in the form of a spherical curvature.
6. Wear means adapted to be secured against the surface of a support comprising a resilient metal wear plate having a surface facing said support surface, which, when in unstressed engagement therewith, is concave relative thereto with a central portion of said plate surface being spaced from said support surface, and securement means for drawing said central portion substantially against said support surface, said wear plate, upon securement, being spring loaded against said support surface.
7. The wear plate of claim 6 wherein said plate is formed with a spherical curvature. k

Claims (7)

1. In a railway truck having side frames, each side frame comprising vertical columns with wear plates secured on the inwardly facing surfaces thereof, said column surfaces being substantially flat, the improvement wherein the wear plate has a concave shape relative to and facing said column surface, and securement means for securing and deflecting said plate into substantially full contact with said surface, said wear plate, upon securement, being spring-loaded against said column surface.
2. The improvement of claim 1 wherein said securement means comprise vertically spaced threaded fasteners secured through apertures in said plate and column.
3. The improvement of claim 2 wherein said apertures and the heads of said bolts have similar tapered surfaces and said apertures receive said heads.
4. The improvement of claim 2 wherein said apertures are spaced inward from the sides of said plate.
5. The improvement of claim 1 wherein said wear plate is generally rectangular and said concave shape is in the form of a spherical curvature.
6. Wear means adapted to be secured against the surface of a support comprising a resilient metal wear plate having a surface facing said support surface, which, when in unstressed engagement therewith, is concave relative thereto with a central portion of said plate surface being spaced from said support surface, and securement means for drawing said central portion substantially against said support surface, said wear plate, upon securement, being spring loaded against said support surface.
7. The wear plate of claim 6 wherein said plate is formed with a spherical curvature.
US00321131A 1973-01-05 1973-01-05 Sprung mounted snubber wear plate Expired - Lifetime US3834320A (en)

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CA188,959A CA989672A (en) 1973-01-05 1973-12-27 Wear plate for railway car truck side frame column

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4254712A (en) * 1979-10-22 1981-03-10 Amsted Industries Incorporated Railway truck side frame wear plate mounting
US4316417A (en) * 1976-01-14 1982-02-23 Dresser Industries, Inc. Welded side frame column wear plate
US4785740A (en) * 1987-05-19 1988-11-22 General Standard Company Dual purpose wear plate
US5239932A (en) * 1992-06-15 1993-08-31 National Castings Inc. Force dampening mechanism of a railroad car truck
US5769185A (en) * 1995-05-25 1998-06-23 Aircraft Braking Systems Corporation Carbon brake disc structures and method of making same
EP1090826A1 (en) * 1999-10-07 2001-04-11 Naco Incorporated Friction wedge for a railroad car truck having a replaceable wear member
US6276283B1 (en) * 1999-04-07 2001-08-21 Amsted Industries Incorporated Railway truck wear plate
US6631685B2 (en) * 2000-09-11 2003-10-14 Meridian Rail Information Systems Corp. Dual friction wear plate assembly for a railcar side frame saddle
US7004079B2 (en) 2001-08-01 2006-02-28 National Steel Car Limited Rail road car and truck therefor
US7143700B2 (en) 2003-07-08 2006-12-05 National Steel Car Limited Rail road car truck and fittings therefor
US7255048B2 (en) 2001-08-01 2007-08-14 Forbes James W Rail road car truck with rocking sideframe
US7328659B2 (en) 2001-08-01 2008-02-12 National Steel Car Limited Rail road freight car with resilient suspension
US7571684B2 (en) 2001-08-01 2009-08-11 National Steel Car Limited Rail road freight car with damped suspension
US7631603B2 (en) 2004-12-03 2009-12-15 National Steel Car Limited Rail road car truck and bolster therefor
US7654204B2 (en) 2002-08-01 2010-02-02 National Steel Car Limited Rail road car truck with bearing adapter and method
US7775163B2 (en) 2004-12-23 2010-08-17 National Steel Car Limited Rail road car and bearing adapter fittings therefor
US7823513B2 (en) 2003-07-08 2010-11-02 National Steel Car Limited Rail road car truck
CN102815316A (en) * 2012-08-22 2012-12-12 北京二七轨道交通装备有限责任公司 Wearing plate and steering frame
EP2703246A3 (en) * 2012-08-30 2014-04-23 ContiTech Luftfedersysteme GmbH Method for making a pneumatic spring lid
US10543858B2 (en) 2017-03-20 2020-01-28 Amsted Rail Company, Inc. Railway car truck with friction shoes

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US1939553A (en) * 1931-10-27 1933-12-12 Sargent & Greenleaf Method of forming sockets
US2169715A (en) * 1937-09-23 1939-08-15 Standard Car Truck Co Stabilized truck and bolster therefor
US2237953A (en) * 1940-07-22 1941-04-08 Standard Car Truck Co Stabilized truck
US3230152A (en) * 1964-04-13 1966-01-18 Jr Frank Kerze Compartmented nuclear reactor fuel rod and method of making
US3362449A (en) * 1965-09-20 1968-01-09 Mc Graw Edison Co Static-free bolt
US3548754A (en) * 1968-08-27 1970-12-22 Standard Car Truck Co Bolster dampening side frame wear plate
US3714905A (en) * 1971-02-16 1973-02-06 Standard Car Truck Co Dampened railway car truck

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1939553A (en) * 1931-10-27 1933-12-12 Sargent & Greenleaf Method of forming sockets
US2169715A (en) * 1937-09-23 1939-08-15 Standard Car Truck Co Stabilized truck and bolster therefor
US2237953A (en) * 1940-07-22 1941-04-08 Standard Car Truck Co Stabilized truck
US3230152A (en) * 1964-04-13 1966-01-18 Jr Frank Kerze Compartmented nuclear reactor fuel rod and method of making
US3362449A (en) * 1965-09-20 1968-01-09 Mc Graw Edison Co Static-free bolt
US3548754A (en) * 1968-08-27 1970-12-22 Standard Car Truck Co Bolster dampening side frame wear plate
US3714905A (en) * 1971-02-16 1973-02-06 Standard Car Truck Co Dampened railway car truck

Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4316417A (en) * 1976-01-14 1982-02-23 Dresser Industries, Inc. Welded side frame column wear plate
US4254712A (en) * 1979-10-22 1981-03-10 Amsted Industries Incorporated Railway truck side frame wear plate mounting
US4785740A (en) * 1987-05-19 1988-11-22 General Standard Company Dual purpose wear plate
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