This invention relates to brake beams for use on railroad car trucks, and more particularly concerns brake beam strut protectors for protecting against wear of a brake beam strut slot surface of a brake beam strut and brake beam assemblies provided with such brake beam strut protectors. This invention also concerns extending the life span of a brake beam strut of a brake beam assembly for a railroad car truck, including extending the life span of a brake beam strut having less than ⅛ inch slot surface wear, as well as extending the life span of a brake beam strut having ⅛ inch or greater slot surface wear provided the structural integrity of such a strut is not compromised and the continued use of such a strut in conjunction with brake beam strut protectors of the invention meets with Association of American Railroads (“AAR”) regulations or other regulatory requirements.
Brake beam assemblies for railroad car trucks are frequently replaced due to wear of the brake beam strut slot surface caused by the brake lever moving back and forth and/or vibrating in the brake beam strut slot. An example of a brake beam strut having a brake beam strut slot surface 27 that has been worn by ⅛ inch or more is shown in
The replacement of a worn brake beam assembly includes costs for materials and labor. Additional costs include having a railroad car out of service while replacement of the brake beam assembly takes place. Due to the high number of railroad cars and the high frequency of replacement of the brake beam assemblies, the overall costs to the railroad industry is substantial.
It is an object of the invention to reduce the occurrence of wear of the brake beam strut slot surface, and thereby reduce the frequency of a brake beam assembly being replaced due to wear of the brake beam strut slot surface.
Another object of the invention is to avoid the costs of replacing a brake beam assembly due to a worn brake beam strut slot surface, by preventing wear of the brake beam strut slot surface and/or by providing a smooth contact surface other than the brake beam strut slot surface for a brake lever to ride on.
It is another object of the invention to provide a brake beam strut protector for protecting against wear of a brake beam strut slot surface of a brake beam strut.
Still another object of the invention is to provide a brake beam assembly in which its brake beam strut slot surface of its brake beam strut is protected against wear.
These and other objects are provided by the invention as set forth below.
Turning now to the drawings, there is shown a brake beam assembly 11 for a railroad car truck. Brake beam assembly 11 has a compression member 13 having a first end portion 13a and a second end portion 13b, a tension member 15 having a first end portion 15a and a second end portion 15b, a brake beam strut 17, a first brake head 19, and a second brake head 21.
As is known in the art, the first brake head 19 is connected to the first end portion 13a of the compression member 13 and the first end portion 15a of the tension member 15, the second brake head 21 is connected to the second end portion 13b of the compression member 13 and the second end portion 15b of the tension member 15, and the brake beam strut 17 is connected to the compression member 13 and to the tension member 15.
The brake beam strut 17 has a slot 23 extending through it for receiving a brake lever 25. The slot 23 defines a brake beam slot surface 27 around the slot 23.
The brake lever 25 is secured in the slot 23 by a lever pin 29 that extends through the pin holes 31a and 31b formed in the brake beam strut 17 at the slot 23 and through a circular opening 33 formed in the brake lever 25 and is affixed to the brake beam strut 17. Depending on the configuration of the brake beam assembly 11, the brake lever 25 may have a first portion 25a extending from the slot 23 (as shown in
Additional details relating to the design and structure of brake beam assemblies may be found in the art, such as in U.S. Pat. Nos. 5,810,124, 6,155,388, and 6,155,389, all of which are incorporated herein by reference.
In a first embodiment of the invention shown in
A first post 39 is positioned on a first end portion 35a of the first body 35, and a second post 41 is positioned on a second end portion 35b of the first body 35. The first post 39 has a front surface portion 39a that is positioned ahead of and parallel to the plane in which the wear surface 37 sits, and the first post 39 has a rear surface portion 39b that is positioned, at least below the bottom surface portion 35e of the body 35, behind and parallel to the plane in which the wear surface 37 sits. Accordingly, both the front surface portion 39a and the rear surface portion 39b (at least below the bottom surface portion 35e of the body 35) are offset (the front surface portion 39a being ahead of the plane of the wear surface 37, and the rear surface portion 39b (at least below the bottom surface portion 35e of the body 35) being behind the plane of the wear surface 37) from the plane of the wear surface 37.
Likewise, the second post 41 has a front surface portion 41a that is positioned ahead of and parallel to the plane in which the wear surface 37 sits, and the second post 41 has a rear surface portion 41b that is positioned, at least below the bottom surface portion 35e of the body 35, behind and parallel to the plane in which the wear surface 37 sits. Accordingly, both the front surface portion 41a and the rear surface portion 41b (at least below the bottom surface portion 35e of the body 35) are offset (the front surface portion 41a being ahead of the plane of the wear surface 37, and the rear surface portion 41b (at least below the bottom surface portion 35e of the body 35) being behind the plane of the wear surface 37) from the plane of the wear surface 37. Preferably, the cross-second of each post 39 and 41 is substantially square in shape, and the distances from the front surface portion 39a to the rear surface portion 39b and from the front surface portion 41a to the rear surface portion 41b are the same and sized to fit snuggly within the slot 23.
Preferably, the first body 35 is provided with rearwardly extending first flange 35c extending horizontally across the rear portion of the first body 35, and a rearwardly extending second flange 35d extending vertically across the rear portion of the first body 35 that intersects with the first flange 35c, for reinforcing the first body 35 behind the wear surface 37.
The bottom surface portion 35e of the first body 35 acts as a stop member 43 for preventing the brake beam strut protector 33 from being pulled completely through the slot 23 of the brake beam strut 17.
The first body 35 and the posts 39 and 41 may be made from metal (e.g., stainless steel) or polymer materials (e.g., nylon), and the first body 35 and the posts 39 and 41 may be integral with one another or component parts secured together using conventional methods known in the art.
To mount the brake beam strut protector 33 in place at the slot 23, the brake beam strut protector 33 is provided with two mounting members 45, each of which has a body 45a having an upper end portion 45b, a lower end portion 45c. The upper end portion 45b preferably has a substantially square cross-sectional shape and is sized to fit snuggly within the slot 23 of the brake beam strut 17. The lower end portion 45c of the body 45a of each mounting member 45 is provided with an outwardly extending flange portion 45d. A bore 47 extends completely through the body 45a of each mounting member 45 from its upper end portion 45b to its lower end portion 45c.
Also, a bore 49 extends completely through the first post 39 from its first end portion 39c to its second end portion 39d, and a bore 51 extends completely through the second post 41 from its first end portion 41c to its second end portion 41d.
A threaded bolt 53 and a nut 55 are used to fasten the first post 39 to one of the mounting members 45, and a threaded bolt 57 and a nut 59 are used to fasten the second post 41 to the other mounting member 45. The threaded bolt 53 has a shaft portion sized to be received and extend through in series the bore 49 in the first post 39 and the bore 47 in one of the mounting members 45, and the threaded bolt 57 also has a shaft portion sized to be received and extended through in series the bore 51 in the second post 41 and the bore 47 in the other mounting member 45.
In use, the posts 39 and 41 are inserted into the slot 23 of the brake beam strut 17 from one side of the slot 23 with the wear surface 37 of the brake beam strut protector 33 facing the brake lever 25. The upper end portion 45b of the body 45a of each mounting member 45 is inserted into the slot 23 from the other side of the slot 23, such that one of the mounting members 45 and the bore 47 extending therethrough are aligned with the first post 39 and the bore 49 extending therethrough, and the other mounting member 45 and the bore 47 extending therethrough are aligned with the second post 41 and the bore 51 extending therethrough. Then, the threaded bolt 53 is extended through the bore 49 in the first post 39 and through the bore 47 in the mounting member 45 aligned with the first post 39, the threaded bolt 57 is extended through the bore 51 in the second post 41 and through the bore 47 in the other mounting member 45 aligned with the second post 41, and nut 55 is screwed onto the end of the threaded bolt 53 and nut 59 is screwed on to the end of the threaded bolt 57 to preferably bring the stop member 43 into contact with the brake beam strut 17 outside the slot 23 and the flange portion 45d of each mounting members 45 into contact with the brake beam strut 17 outside the slot 23.
With the brake beam strut protector 33 in place, the brake lever 25 rides on the wear surface 37 rather than on the brake beam strut slot surface 27, since the wear surface 37 is in a plane that is higher than the plane of the brake beam strut slot surface 27 due to the plane of the wear surface 37 being offset from the plane of the rear surface portions 39b and 41b of the first and second posts 39 and 41. Accordingly, the brake beam strut protector 33 protects the brake beam strut slot surface 27 from wearing as the brake lever 25 is moved back and forth in the slot 23 of the brake beam strut 17.
In a second embodiment of the invention shown in
Preferably, in use, the posts 39 and 41 of the first segment of the protector 61 are inserted into the slot 23 of the brake beam strut 17 from one side of the slot 23 with the wear surface 37 of the body 35 of the first segment facing the brake lever 25, and the posts 39 and 41 of the second segment of the protector 61 are inserted into the slot 23 from the other side of the slot 23, such that the post 39 of first segment and the bore 49 that extends through the post 39 of the first segment are in alignment with the post 39 of the second segment and the bore 49 that extends through the post 39 of the second segment, and such that the post 41 of the first segment and the bore 51 that extends through the post 41 of the first segment are in alignment with the post 41 of the second segment and the bore 51 that extends through the post 41 of the second segment. With this arrangement, the wear surface 37 of one of the two segments faces the brake lever 25 from one side of the brake lever 25 and the wear surface 37 of the other of the two segments faces the brake lever 25 from the other side of the brake lever 25. That is, one of the wear surfaces 37 of the protector 61 faces one side of the brake lever 25, while the other wear surface 37 of the protector 61 faces the other side of the brake lever 25. An advantage of this embodiment of the invention is that it can be used for left or right hand brake beams.
In a third embodiment of the invention as shown in
The body 73 of the brake beam strut protector 71 of this embodiment of the invention is provided with a central opening 81 through which a lever pin 29 around which the brake lever 25 rotates extends when the brake beam strut protector 71 is in use.
Preferably, when the brake beam strut protector 71 is used in #18 and #24 brake beams, its disk-shaped body 73 has a thickness of about 0.06 inches, and a diameter of about 5 inches. Preferably, the central opening 81 of such a body 73 has a diameter of about 1½ inches. Also, the body 73 of the third embodiment of the invention preferably is made from metal (e.g., stainless steel) using preferably a stamping manufacturing process (but also may be made using a cutting, molding, casting, or machining process), or a polymeric material (e.g., nylon) using an injection molding, casting, forming, or cutting process, or composites or non-metallic materials of various types using an injection molding, casting, forming, or cutting process.
With the brake beam strut protector 71 in place, the brake lever 25 rides on the wear surface 79 rather than on the brake beam strut slot surface 27. Accordingly, the brake beam strut protector 71 protects the brake beam strut slot surface 27 from wearing as the brake lever 25 is moved back and forth in the slot 23 of the brake beam strut 17.
In a fourth embodiment of the invention shown in
A blocking member is provided for preventing the brake beam strut protector 91 from rotating in the slot 23 completely around the lever pin when the brake beam strut protector 91 is in use. Preferably, the blocking member comprises a first stop 99 formed on the body 93 at the corner area 101 of the rear surface portion 102 of the body 93 and extending outwardly above the rear surface portion 102 sufficiently high enough to prevent the first stop 99 from entering the slot 23 when the protector 91 is in use, and a second stop 103 formed on the body 93 at the corner area 105 of the rear surface portion 102 of the body 93 and extending outwardly above the rear surface portion 102 sufficiently high enough to prevent the second stop 103 from entering the slot 23 when the protector 91 is in use.
The body 93 of the brake beam strut protector 91 of this embodiment of the invention is provided with a central opening 107 through which a lever pin 29 around which the brake lever 25 rotates extends when the brake beam strut protector 91 is in use.
Preferably, when the brake beam strut protector 91 is used in #18 and #24 brake beams, its body 93 has a thickness of about 0.06 inches, a height of about 4¼ inches, and a width of about 6 inches.
Also, the body 93 and the stops 99 and 103 preferably are integral with one another, and the protector 91 preferably is made from metal (e.g., stainless steel) using preferably a stamping manufacturing process, or a polymeric material (e.g., nylon) using an injection molding process.
With the brake beam strut protector 91 in place, the brake lever 25 rides on the wear surface 97 rather than on the brake beam strut slot surface 27. Accordingly, the brake beam strut protector 91 protects the brake beam strut slot surface 27 from wearing as the brake lever 25 is moved back and forth in the slot 23 of the brake beam strut 17.
Regarding the brake beam strut protectors 33 and 61 of the first and second embodiments of the invention, each brake beam strut protector 33 and 61 may be installed onto a brake beam strut 17 without having to disassemble the brake system, and such installation may be accomplished using only a wrench to tighten the nuts 55 and 59 onto the threaded bolts 53 and 57. Also, no welding is required.
Regarding the brake beam strut protector 71 of the third embodiment of the invention, if the brake beam assembly 11 is being assembled for the first time, the brake beam strut protector 71 may be installed by inserting the brake beam strut protector 71 into the slot 23 and positioning the protector 71 between the brake beam strut slot surface 27 and the brake lever 25 such that the central opening 81 in protector 71 is aligned with the opening 33 in the brake lever 25, and then inserting a lever pin 29 through the a first pin hole 31a in the brake beam strut 17, the opening 33 in the brake lever 25, the opening 81 to in the protector 71 then the other pinhole 31b in the brake beam strut 17, to the secure the brake lever 25 and the protector 71 in place in the slot 23. If protector 71 is to be installed on an assembled brake beam assembly 11, the end 29a of the lever pin 29 is at least first partially withdrawn from the second pin hole 31b and moved far enough into the slot 23 to create sufficient room for the protector 71 to be placed in the slot 23 between the brake lever 25 and the brake beam strut slot surface 27 without being blocked by the lever pin 29. Then, the protector 71 may be inserted into the slot 23 and positioned between the brake beam strut slot surface 27 and the brake lever 25 such that the opening 81 in the protector 71 is aligned with the opening 33 in the brake lever 25, and the lever pin 29 then may be positioned so that it extends through the pin hole 31a, the opening 33 in the brake lever 25, the opening 81 in the protector 71, and the pin hole 31b, to secure the brake lever 25 and the protector 71 in place in the slot 23.
Regarding the brake beam strut protector 91 of the fourth embodiment of the invention, if the brake beam assembly 11 is being assembled for the first time, the brake beam strut protector 91 may be installed by inserting the brake beam strut protector 91 into the slot 23 and positioning the protector 91 between the brake beam strut slot surface 27 and the brake lever 25 such that the central opening 107 in protector 91 is aligned with the opening 33 in the brake lever 25, and then inserting a lever pin 29 through the first pin hole 31a in the brake beam strut 17, the opening 33 in the brake lever 25, the opening 107 to in the protector 71 then the other pin hole 31b in the brake beam strut 17, to secure the brake lever 25 and the protector 91 in place in the slot 23. If protector 91 is to be installed on an assembled brake beam assembly 11, the end 29a of the lever pin 29 is at least first partially withdrawn from the second pin hole 31b and moved far enough into the slot 23 to create sufficient room for the protector 91 to be placed in the slot 23 between the brake lever 25 and the brake beam strut slot surface 27 without being blocked by the lever pin 29. Then, the protector 91 may be inserted into the slot 23 and positioned between the brake beam strut slot surface 27 and the brake lever 25 such that the opening 107 in the protector 91 is aligned with the opening 33 in the brake lever 25, and the lever pin 29 then may be positioned so that it extends through the pin hole 31a, the opening 33 in the brake lever 25, the opening 107 in the protector 91, and the pin hole 31b, to secure the brake lever 25 and the protector 91 in place in the slot 23.
By protecting against wear of a brake beam strut slot surface 27 of a brake beam strut 17, the brake beam strut protectors 33, 61, 71, and 91 extend the life span of the brake beam strut 17.
In addition to protecting against wear of a brake beam strut slot surface 27 of a brake beam strut 17, the brake beam strut protectors 33, 61, 71, and 91 may be used to extend the life span of a brake beam strut 17 that already has 1) a worn brake beam strut slot surface 27 of less than ⅛ inch of slot surface 27 wear, or 2) a worn brake beam strut slot surface 27 of ⅛ inch or more of slot surface 27 wear provided the structural integrity of such a strut 17 (e.g., a strut 17 having ⅛ inch or more of slot surface 27 wear) is not compromised and provided that the continued use of a brake beam strut 17 having ⅛ inch or more of slot surface 27 wear in conjunction with brake beam strut protectors 33, 61, 71, and 91 of the invention meets with Association of American Railroad (“AAR”) regulations or other regulatory requirements. Rather than replacing a brake beam strut 17 having a worn brake beam strut slot surface 27 with a new brake beam strut 17, a brake beam strut protector 33, 61, 71, or 91 of the invention may be installed in place on the brake beam strut 17 that already has a worn brake beam strut slot surface 27 to block the brake lever 25 from contacting the worn brake beam strut slot surface 27 and to provide a smooth contact surface for the brake lever 25 to ride on as it is moved back and forth in the brake beam strut slot 23 between a “brakes applied” position and a “brakes released” position. By providing a smooth surface (the wear surface 37, 79, or 97) for the brake lever 25 to ride on, the problem of interference of movement of the brake lever 25 in the brake beam strut slot 23 caused by a worn brake beam strut slot surface 27 is avoided. Accordingly, a brake beam strut 17 having a worn slot surface 27, if provided with a brake beam strut protector 33, 61, 71, or 91 of the invention, may have continued life in service on a brake beam assembly 11, since the wear surface 37, 79, or 97 of the respective brake beam strut protector 33, 61, 71, or 91 provides a smooth contact surface for the brake lever 25 to ride on without interfering with the movement of the brake lever 25 in the brake beam strut slot 23 between a “brakes applied” position in the slot 23 and a “brake released” position in the slot 23, and since the wear surface 37, 79, or 97 of the respective brake beam strut protector 33, 61, 71, or 91 blocks the brake lever 25 from contacting the wore brake beam strut slot surface 27, thereby avoiding any possible interference by the worn brake beam strut slot surface 27 of such movement of the brake lever 25 in the slot 23.
Number | Name | Date | Kind |
---|---|---|---|
800409 | Sharp | Sep 1905 | A |
949882 | Busse | Feb 1910 | A |
955620 | Walck | Apr 1910 | A |
1106765 | Williams, Jr. | Aug 1914 | A |
1519765 | Crone | Dec 1924 | A |
1536568 | Crone | May 1925 | A |
1943271 | Ivemeyer | Jan 1934 | A |
2047732 | Harbert | Jul 1936 | A |
2330748 | Sagstetter | Sep 1943 | A |
2431914 | Brown | Dec 1947 | A |