CA1178122A - Friction shoe wear indicator - Google Patents
Friction shoe wear indicatorInfo
- Publication number
- CA1178122A CA1178122A CA000387188A CA387188A CA1178122A CA 1178122 A CA1178122 A CA 1178122A CA 000387188 A CA000387188 A CA 000387188A CA 387188 A CA387188 A CA 387188A CA 1178122 A CA1178122 A CA 1178122A
- Authority
- CA
- Canada
- Prior art keywords
- bolster
- friction shoe
- vertical
- friction
- shoe
- 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
Links
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Train Traffic Observation, Control, And Security (AREA)
- Braking Arrangements (AREA)
Abstract
EJB:cd 8/22/80 Case 5747 (5794) FRICTIONALLY SNUBBED RAILWAY CAR TRUCK
WEAR INDICATION ARRANGEMENT
Abstract In a railway truck side frame arrangement, a bolster is supported in a side frame arrangement. The bolster is limited or snubbed from oscillating motion by friction shoes located in wedge shaped pockets in each side frame. The friction shoe is modified to visually indicate combined wear of various control surfaces.
-i-
WEAR INDICATION ARRANGEMENT
Abstract In a railway truck side frame arrangement, a bolster is supported in a side frame arrangement. The bolster is limited or snubbed from oscillating motion by friction shoes located in wedge shaped pockets in each side frame. The friction shoe is modified to visually indicate combined wear of various control surfaces.
-i-
Description
~JB:am ~ev. 4/22/8 Case 5747 Z'~
The present invention relates to frictionally snubbed railway car trucks, and more par~icularly to a modification to a friction shoe located between the bolst~r and the side frame to indicate the combined wear of various control sur~aces.
The use of friction shoes as snubbing devices to control the oscillating movements of the bolster in the side frame is known. Arrangements for using such friction shoes are shown in U.S. Patent Nos. 2 t 953,995 and 4,109,5859 both assigned to the assignee of the present invention.
The type of railway car truck to which the present invention is generally related comprises spaced side frame members each having an opening arranged to resiliently support opposite ends of a bolster. The bolster and side frame form two wedge-shaped openings at either end of the bol~ter. A spring biased friction shoe is provided in each wedge-sh~ped opening. The friction shoe frictionally engages both the side frame and the bolster for controlLing the oscillating movement of the bolster.
Satlsfactory results are obtained in limiting the oscillating motion of the bolster only as long as the friction parts are not allowed to develop excessive wear.
Such a condition will cause the biasing springs to exert a force which is out of tolerance and thus becomes ineffective in dampening bolster oscillations.
~-JB:cd ~/22/80 Case 57~7 ~n indicating arrangement for determining when the fric~ion shoes themselves have developed excessive wear is shown in U.S. Patent No. 3,805,707, assigned to the assignee of the pre3ent inven~ion. In tha~ arrangement, a wear indicator hole is provided in the bolster. The wear indicator hole enables a viewer to compare the present posltion of the friction shoe to a previouslv established reference. Thus the present position of the friction shoe enables the viewer to dete~mine the wear remaining in the friction shoe, but is in a rather difficult to view loca~ion and becomes hidden if a certain limit of wear is exceeded.
It is therefore an object of the present invention to provide an easy to view indication of the combined wear of the various friction contact surfaces in the railway truck.
It is a further object of the present invention to provide an indicating means on ~he friction shoe itsel~
which, when referenced with the bolster top, readily indicates the co~bined wear of the bolster and the side frame contact surfaces, as well as the friction shoe itself, for wear conditions ranging from new to and beyond the replacement wear limit.
-- Brief D_scrlDtion of the Drawings In the drawings:
Figure 1 is a fragmentary side elevational view of a railway car truck embodying the present invention;
Figure 2 is a detailed fragmentary side elevational view of a railway car truck bolster and fric~ion shoes;
EJB:cd 8/22/80 - Case 5747 ~ igure 3 is a fra~mentary side elevational ~iew o a railway car cruck bolster, side frame and friction shoes embodying the present invention;
Figure 4 is a detailed side elevational view of ~he side frame column, bolster and riction shoe, with the shoe in~icator in an unworn position;
Figure 5 is a detailed side elevational view o~
the side frame column, bolster and friction shoe, wi~h the shoe indicator in a worn position.
Descrip~ion of the Preferred ~mbodiment Referring now to Fig. 1 of the drawings, there is shown a side frame 10 having a pair of columns 12 defining the sides of a bolster opening 14 formed in the frame.
One end of a bolster 16 is resiliently supported in the bols~er opening 14 on outer load s~rings ll and inner load springs 13. Friction plates 20 may be integral with or suitably mounted on side :Erame columns 12.
As best seen in Figs. 2 and 3, friction shoe 24 comprises a body portion 26 having a friction wall 28 which frictionally engages a friction surface 30 on side frame column friction plate 20. Friction shoe 24 is urged into frictional engagement with plate 20 by control spring 23. Control spring 23 is received in a central ~ spring poc~et formed in friction shoe 24 and is compressed between a lower wall 36 of bolster 16 and an u~per wall 39 of friction shoe 24. The spring urges an upper surface 40 of sloped wings 42, which project outwax~ly from opposite si~es oi b~!y portion 26 of friction shoe 24, into engagement with a guiding surface 44 of bolster 16.
EJB:cd 8/22/80 ` ! Case 57~.7 .~.s best seen in Figures ~ and 5, f~~iction wall 2S
of fric~ion shoe 26 i5 modiried such that an indicating reces~ or indentation 48 is presen~. Such recess would most co~monlv b~ fonmed in ~he friction shoe during the casting operation. A normal or unworn friction shoe and adjacent friction suraces are shown in Fig. 4.
Note that the indicating recess 48 is below top wall 38 of the bolster i6. However, as friction shoe 24 and adjacent friction surfaces are worn by the oscilla~ing motion of bolster 16 in side rame 10 during operatîon, the friction surfaces will become worn. Accordingly, as shown in Figure S, frictior, shoe 24 will rise due ~o the worn surfaces and indicating recess 48 will become visible above top wall 38 of bolster 16. The length of indicating recess 48 will be such that when the~recess-is entirely vi:sible abov~e bQlster 16, corrective maintenance or replacement of friction shoe 24 or other friction sur-faces should be undertaken.
Thus the present invention is seen to provide an indicating means to readily show an inspector when corrective maintenance of the friction dam~ening mechanism of the railway car truck should be undertaken. Other e~bodiments of the present invention not incorporating all the specific eatures of the above-described embodiments - 25 are conside~ed part of the present invention, which is to be limited only as set forth in the following claims.
The present invention relates to frictionally snubbed railway car trucks, and more par~icularly to a modification to a friction shoe located between the bolst~r and the side frame to indicate the combined wear of various control sur~aces.
The use of friction shoes as snubbing devices to control the oscillating movements of the bolster in the side frame is known. Arrangements for using such friction shoes are shown in U.S. Patent Nos. 2 t 953,995 and 4,109,5859 both assigned to the assignee of the present invention.
The type of railway car truck to which the present invention is generally related comprises spaced side frame members each having an opening arranged to resiliently support opposite ends of a bolster. The bolster and side frame form two wedge-shaped openings at either end of the bol~ter. A spring biased friction shoe is provided in each wedge-sh~ped opening. The friction shoe frictionally engages both the side frame and the bolster for controlLing the oscillating movement of the bolster.
Satlsfactory results are obtained in limiting the oscillating motion of the bolster only as long as the friction parts are not allowed to develop excessive wear.
Such a condition will cause the biasing springs to exert a force which is out of tolerance and thus becomes ineffective in dampening bolster oscillations.
~-JB:cd ~/22/80 Case 57~7 ~n indicating arrangement for determining when the fric~ion shoes themselves have developed excessive wear is shown in U.S. Patent No. 3,805,707, assigned to the assignee of the pre3ent inven~ion. In tha~ arrangement, a wear indicator hole is provided in the bolster. The wear indicator hole enables a viewer to compare the present posltion of the friction shoe to a previouslv established reference. Thus the present position of the friction shoe enables the viewer to dete~mine the wear remaining in the friction shoe, but is in a rather difficult to view loca~ion and becomes hidden if a certain limit of wear is exceeded.
It is therefore an object of the present invention to provide an easy to view indication of the combined wear of the various friction contact surfaces in the railway truck.
It is a further object of the present invention to provide an indicating means on ~he friction shoe itsel~
which, when referenced with the bolster top, readily indicates the co~bined wear of the bolster and the side frame contact surfaces, as well as the friction shoe itself, for wear conditions ranging from new to and beyond the replacement wear limit.
-- Brief D_scrlDtion of the Drawings In the drawings:
Figure 1 is a fragmentary side elevational view of a railway car truck embodying the present invention;
Figure 2 is a detailed fragmentary side elevational view of a railway car truck bolster and fric~ion shoes;
EJB:cd 8/22/80 - Case 5747 ~ igure 3 is a fra~mentary side elevational ~iew o a railway car cruck bolster, side frame and friction shoes embodying the present invention;
Figure 4 is a detailed side elevational view of ~he side frame column, bolster and riction shoe, with the shoe in~icator in an unworn position;
Figure 5 is a detailed side elevational view o~
the side frame column, bolster and friction shoe, wi~h the shoe indicator in a worn position.
Descrip~ion of the Preferred ~mbodiment Referring now to Fig. 1 of the drawings, there is shown a side frame 10 having a pair of columns 12 defining the sides of a bolster opening 14 formed in the frame.
One end of a bolster 16 is resiliently supported in the bols~er opening 14 on outer load s~rings ll and inner load springs 13. Friction plates 20 may be integral with or suitably mounted on side :Erame columns 12.
As best seen in Figs. 2 and 3, friction shoe 24 comprises a body portion 26 having a friction wall 28 which frictionally engages a friction surface 30 on side frame column friction plate 20. Friction shoe 24 is urged into frictional engagement with plate 20 by control spring 23. Control spring 23 is received in a central ~ spring poc~et formed in friction shoe 24 and is compressed between a lower wall 36 of bolster 16 and an u~per wall 39 of friction shoe 24. The spring urges an upper surface 40 of sloped wings 42, which project outwax~ly from opposite si~es oi b~!y portion 26 of friction shoe 24, into engagement with a guiding surface 44 of bolster 16.
EJB:cd 8/22/80 ` ! Case 57~.7 .~.s best seen in Figures ~ and 5, f~~iction wall 2S
of fric~ion shoe 26 i5 modiried such that an indicating reces~ or indentation 48 is presen~. Such recess would most co~monlv b~ fonmed in ~he friction shoe during the casting operation. A normal or unworn friction shoe and adjacent friction suraces are shown in Fig. 4.
Note that the indicating recess 48 is below top wall 38 of the bolster i6. However, as friction shoe 24 and adjacent friction surfaces are worn by the oscilla~ing motion of bolster 16 in side rame 10 during operatîon, the friction surfaces will become worn. Accordingly, as shown in Figure S, frictior, shoe 24 will rise due ~o the worn surfaces and indicating recess 48 will become visible above top wall 38 of bolster 16. The length of indicating recess 48 will be such that when the~recess-is entirely vi:sible abov~e bQlster 16, corrective maintenance or replacement of friction shoe 24 or other friction sur-faces should be undertaken.
Thus the present invention is seen to provide an indicating means to readily show an inspector when corrective maintenance of the friction dam~ening mechanism of the railway car truck should be undertaken. Other e~bodiments of the present invention not incorporating all the specific eatures of the above-described embodiments - 25 are conside~ed part of the present invention, which is to be limited only as set forth in the following claims.
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A friction apparatus for a railway car truck comprising a side frame having a substantially upright column particularly defining a bolster opening, a bolster resiliently supported in a said opening for vertical movement therein, said bolster having top and bottom walls, a vertical planar surface on said column, a top wall and a guiding surface on said bolster, a friction shoe comprising a substantially verti-cal wall, a sloped surface and a spring pocket, a control spring located in said spring pocket of said friction shoe for urging said friction shoe vertical wall into frictional contact with said column vertical planar surface and said sloped surface into frictional contact with said guiding surface on said bolster, wherein the substantially vertical wall of said friction shoe has a recessed indicating portion which is below the top wall of said bolster when said friction shoe is within acceptable wear conditions and which extends above said top wall of said bolster so as to be always visible when the vertical and sloped frictional contact surfaces of said friction shoe are worn to such an extent that repairs are indicated.
Case 5747
Case 5747
2. In a railway car truck including a bolster resiliently supported on spring groups in side frames between spaced vertical columns thereof, said bolster having slope surfaces on both sides thereof, two friction shoes each having a slope face and a vertical face interposed between each bolster slope surface and vertical column, respectively, a control spring for urging the friction shoe into frictional engagement with the bolster slope surfaces and the vertical columns, wherein the vertical face of the friction shoe includes a recessed indicating notch which is obscured by the bolster when the friction shoe is within acceptable wear conditions and which extends above the bolster so as to be always visible when the frictional engagement between the friction shoe and the bolster slope surface and vertical columns becomes worn to such an extent that repairs are indicated.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US19866180A | 1980-10-20 | 1980-10-20 | |
| US198,661 | 1980-10-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1178122A true CA1178122A (en) | 1984-11-20 |
Family
ID=22734277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000387188A Expired CA1178122A (en) | 1980-10-20 | 1981-10-02 | Friction shoe wear indicator |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS5795249A (en) |
| KR (1) | KR850001825B1 (en) |
| AR (1) | AR230029A1 (en) |
| BE (1) | BE890780A (en) |
| BR (1) | BR8106711A (en) |
| CA (1) | CA1178122A (en) |
| ES (1) | ES8301791A1 (en) |
| GB (1) | GB2086330B (en) |
| IN (1) | IN153749B (en) |
| MX (1) | MX154464A (en) |
| PT (1) | PT73809B (en) |
| ZA (1) | ZA817237B (en) |
| ZW (1) | ZW24781A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9114814B2 (en) * | 2012-10-17 | 2015-08-25 | Nevis Industries Llc | Split wedge and method for making same |
| CA2888206C (en) * | 2013-03-14 | 2017-10-24 | Nevis Industries Llc | Split wedge and method for making same |
| USD754323S1 (en) | 2014-02-17 | 2016-04-19 | 3M Innovative Properties Company | Hearing device retainer |
| USD754324S1 (en) | 2014-02-17 | 2016-04-19 | 3M Innovative Properties Company | Hearing device retainer |
| USD733865S1 (en) | 2014-02-17 | 2015-07-07 | 3M Innovative Properties Company | Earplug switch |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3805707A (en) * | 1972-07-18 | 1974-04-23 | Amsted Ind Inc | Railway truck snubbing indication arrangement |
-
1981
- 1981-10-02 CA CA000387188A patent/CA1178122A/en not_active Expired
- 1981-10-12 ZW ZW247/81A patent/ZW24781A1/en unknown
- 1981-10-12 AR AR287069A patent/AR230029A1/en active
- 1981-10-13 PT PT73809A patent/PT73809B/en not_active IP Right Cessation
- 1981-10-17 KR KR1019810003925A patent/KR850001825B1/en active Pre-grant Review Request
- 1981-10-19 BE BE0/206280A patent/BE890780A/en not_active IP Right Cessation
- 1981-10-19 JP JP56165860A patent/JPS5795249A/en active Pending
- 1981-10-19 BR BR8106711A patent/BR8106711A/en unknown
- 1981-10-19 ES ES506342A patent/ES8301791A1/en not_active Expired
- 1981-10-20 IN IN1156/CAL/81A patent/IN153749B/en unknown
- 1981-10-20 GB GB8131557A patent/GB2086330B/en not_active Expired
- 1981-10-20 ZA ZA817237A patent/ZA817237B/en unknown
- 1981-10-20 MX MX189723A patent/MX154464A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AR230029A1 (en) | 1984-02-29 |
| IN153749B (en) | 1984-08-18 |
| GB2086330B (en) | 1984-06-20 |
| PT73809A (en) | 1981-11-01 |
| BR8106711A (en) | 1982-07-06 |
| ES506342A0 (en) | 1982-12-16 |
| ES8301791A1 (en) | 1982-12-16 |
| GB2086330A (en) | 1982-05-12 |
| MX154464A (en) | 1987-08-28 |
| JPS5795249A (en) | 1982-06-14 |
| BE890780A (en) | 1982-04-19 |
| KR830007340A (en) | 1983-10-19 |
| PT73809B (en) | 1983-05-16 |
| ZA817237B (en) | 1982-09-29 |
| ZW24781A1 (en) | 1982-03-17 |
| KR850001825B1 (en) | 1985-12-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |