US1893476A

US1893476A - Truck side frame

Info

Publication number: US1893476A
Application number: US574436A
Authority: US
Inventors: Edith R Symington; Thomas R Symington
Original assignee: Symington Co
Current assignee: Symington Co
Priority date: 1931-11-11
Filing date: 1931-11-11
Publication date: 1933-01-03
Anticipated expiration: 1950-01-03

Description

Jan 3, 1933. T. H. SYMINGTON TRUCK S IDE FRAME Filed NOV. 11. 1931 w? m y 4 rQT WJw m W :33 r W 3? a 1 7 QWQ 1 .3 x a Z I a t V/%% m m W/QM m i 7W Patented Jan. 3, 1933 UNITED STATES PATENT OFFICE THOMAS H. SYMINGTON, DECEASED, LATE OF BALTIIMOBE, IIARYLAND, BY EDITH R. SYMINGTON AND THOMAS E. SYMINGTON, EXECUTORS, OF BALTIMORE, MARYLAND, ASSIGNORS TO T. H. SYMINGTON & SON, INCL, OF BALTIIWOBE, MARYLAND, A COR- IPOR-ATION OF MARYLAND TRUCK SIDE FRAME Application filed. November 11, 1931.

The invention relates to railway car trucks and has special reference to the construction of side frames.

The principal object of the invention, generally stated, is to provide a truck side frame of the castintegral journal box type having a novel construction at the juncture of the compression and tension members with each other and with the journal box, the most not able characteristic being the location of the thrust transmitting elements and the distribution of the metal which are such as to attain the substantially ideal condition, that is to say the concentration of the load at the working joints.

Another object is to provide a side frame in which the tension member is spaced above the inner upper edge of the box instead of merging directly thereinto as is common practice, diagonally extending ribs being provided which merge into the side walls of the tension member and into the upper inner edge of the box, these ribs cooperating with other ribs which will insure proper strength at the location specified without chunkiness or undue thickness of metal.

A very important but specific object of the invention is to provide a novel reinforcement at the roof of the journal box whereby the vertical thrust coming thereon will be carried straight up and transmitted in shear to the junction of the tension and compression members.

Another object is to provide a construction of this character in which by virtue of the carrying of the maximum load to the working points of the neutral axes of the tension and compression members, the side walls of the juncture of these members may be materially lightened.

An additional object is to provide a side frame possessing these advantageous characteristics and which will at the same time be no more expensive to make than the ordinary type and which will moreover be extremely strong and durable in service, anda general improvement in the art.

To the attainment of the foregoing and other objects and advantages, the invention preferably consists in the details of construc- Serial No. 574,436.

tion and the arrangement and combination of parts to be hereinafter more fully described and claimed, and illustrated in the accompanying drawing in which:

Figure 1 is a vertical longitudinal section through one end portion of a side frame constructed in accordance with the invention,

Figure 2 is a fragmentary end elevation,

Figure 3 is a horizontal cross section taken on the line 38 of Figure 1, and

Figure 4 is a detail fragmentary section taken on the line 4.-1 of Figure 1.

' Referring more particularly to the drawing, it will be observed in the first place that there is disclosed a side frame of the cast integral journal box type, the frame including compression and tension members 5 and 6 channel shaped in cross section with their open sides toward each other and provided on their inner faces at the open sides with beads 7 and 8, respectively. These compression and tension members converge outwardly of the center of the frame and merge into each other and into the journal box 9, this juncture being indicated generally by the numeral 10. The beads 7 and 8 join at 11. Moreover the members 5 and 6 preferably connect at a point somewhat inwardlly of the journalbox by diagonal ties 12 which may be provided with stiffening ribs 13.

The compressionmember 5 has its outer end portion curved downwardly at 14 and bifurcated at 15, thereby defining Webs 16 which fade out as this member joins the top of the box. The tension member has its web or bottom wall definitely spaced above the upper inner ed e of the box instead of merging directly thereinto as is usually the case, and a proper bracing action is attained by the provision of diagonal ribs 17 and 18 which extend at right angles to the sides of the tension member and which merge thereinto, the former fading out at the front end portion of the box and the latter being joined onto the wall of the dust guard pocket 19. In addition, ribs 20 are provided at the upper inner edge of the journal box at the juncture of the tension member therewith.

Beginning at a point substantially over this edge of the box the web or bottom wall of the tension member 6 is bifurcated at 21, thereby defining inclined webs 22 which fade off or merge into the sides of the juncture 10 above substantially the center of the journal box, these webs increasing in thickness as their width diminishes to compensate for the loss of area resulting from the bifurcation.

To take the upward thrust upon the journal box and to transmit it directly to the juncture 10 of the compression and tension members, there is provided a very heavy transverse rib 23 formed on the roof 24 of the box and having its sides deflected or extended upwardly abruptly as shown at 25 in Figure 2. This rib is of considerable height, the points where its upper corners merge into the side walls of the juncture 10 being at the point 26 which is the intersection of the neutral axes 27 and 28 of the compression and tension members, respectively. In addition it is preferable to provide pairs of inclined or substantially

triangular ribs

29 and 30 which rise preferably at an angle of forty-five degrees from the roof 24 of the box and which likewise merge into the side walls of the juncture 10. These pairs of ribs are located at opposite sides of the center of the box and are preferably equi-distant therefrom as clearly illustrated in Figure 1. These ribs combined with the heavy rib 23 are capable of transmitting the load vertically with perfeet safety and as a matter of fact the rib 23 alone can be relied upon to carry the entire vetrical load of the side frame and transmit it in shear to the juncture 10 of the tension and compression members.

As an additional factor of strength the inside guide lugs 31 in the journal box are preferably flared outwardly at their upper ends 32 where they join the roof of the box as indicated in Figure 2. Inasmuch as the central roof reinforcing rib 23 is to carry the maximum load to the working points of the neutral axes of the compression and tension members, it is easily possible to lighten the side walls of the juncture 10 without sacrificing strength. As a consequence the metal at the areas 33 between the central rib 23 and the

ribs

29 and 30 may be made quite thin as clearly shown in Figure 3. Moreover the tension member may have the thickest portion of its side walls adjacent the journal box as shown at 34, the metal thinning out or being lightened from the bifurcation 21 away from the journal box to approximately the point 35 from which point the thickness is preferably uniform.

A side frame constructed as shown and described is of course used in the same manner as any other but has the great advantage of increased strength and rigidity. The lateral forces exerted by the journal box are transmitted to the tension member by virtue of the diagonal ribs 17 and 18 and the upward thrusts are transmitted through the transverse rib 23 vertically upward directly to the sides of the juncture of the compression and tension members. On account of the heavy rib 23 and the auxiliary pairs of

ribs

29 and 30 it is clear that the ribs usually provided on the journal box roof and extending to the outer sides of the juncture may be eliminated as sufficient strength is provided Without their presence. All the characteristics have been discussed above and it is consequently believed that the construction, operation and advantages should be readily apparent to one skilled in the art without further explanation.

WVhile there is shown and described the preferred embodiment of the invention, it should be understood that the disclosure is merely an exemplification of the principles involved as the right is reserved to make all such changes in the details of construction as will widen the field of utility and increase the adaptability of the device provided such changes constitute no departure from the spirit of the invention or the scope of the claims hereunto appended.

Having thus described the invention, what is claimed is: v

1. In a side frame, compression and tension members having their outer ends converging and joined to an integral journal box, means formed on the roof of the box and extending upwardly with respect thereto and joined to the inner faces of the sides of the juncture of the compression and tension members for transmitting vertical loads directly thereto, said means comprising a relatively heavy transverse rib located at the center of the roof and having a horizontal intermediate portion and abruptly ascending end portions joining said juncture, and auxiliary ribs arranged in pairs and rising from the journal box roof at opposite sides of the first named rib and merging into the inner faces of the juncture of the compression and tension members.

2. In a side frame, compression and tension members having their outer ends converging and joined to an integral journal box, means formed on the roof of the box and extending upwardly with respect thereto and joined to the inner faces of the sides of the juncture of the compression and tension members for transmitting vertical loads directly thereto, said means comprising a relatively heavy transverse rib located at the center of the roof and having a horizontal intermediate portion and abruptly ascending end portions joining said juncture, and auxiliary ribs arranged in pairs and rising from the journal box roof at opposite sides of the first named rib and merging into the inner faces of the juncture of the compression and tension members, said auxiliary ribs inclining upwardly and outwardly and merging into the juncture of the compression and tension members at points considerably below the merging of the first named rib into the juncture.

3. In a side frame, compression and tension members having their outer ends converging and joined to an integral journal box, means formed on the roof of the box and extending upwardly with respect thereto and joined to the inner faces of the sides of the juncture of the compression and tension members for transmitting vertical loads directly thereto, said means comprising a relatively heavy transverse rib located at the center of the roof and having a horizontal intermediate portion and abruptly ascending end portions joining said juncture, and auxiliary ribs arranged in pairs and rising from the ournal box roof at opposite sides of the first named rib and merging into the inner faces of the juncture of the compression and tension members, said auxiliary ribs inclining upwardly and outwardly at an angle of substantially forty-five degrees.

4. In a side frame, compression and tension members converging outwardly and joined to each other and to an integral journal box, the tension member having its bottom Wall or web spaced above the upper inner edge of the box, diagonal ribs joined to the sides of the tension members and the upper inner edge of the journal box for transmitting transverse forces from the journal box to the tension member, and a relatively heavy transverse rib on the journal box roof at the center thereof and merging into the inner faces of the juncture of the compression and tension members for transmitting vertical forces to said members.

5. In a side frame, compression and tension members converging outwardly and joined to each other and to an integral journal box, the tension member having its bottom wall or Web spaced above the upper inner edge of the box, diagonal ribs joined to the sides of the tension member and the inner edge of the journal box for transmitting transverse forces from the journal box to the tension member, and a relatively heavy transverse rib on the journal box roof at the center thereof and merging into the inner faces of the juncture of the compression and tension members for transmitting vertical forces to said members, the upper extremities of said rib extending to the intersection of the neutral axes of the compression and tension members.

6. In a side. frame, compression and tension members converging outwardly and joined to each other and to an integral journal box, the tension member having its bottom wall or web spaced above the upper inner edge of the box, diagonal ribs joined to the sides of the tension member and the upper inner edge of the journal box for transmittmg transverse forces from the journal box to the tension member, and a relatively heavy transverse rib on the journal box roof at the center thereof and merging into the inner faces of the juncture of the compression and tension members for transmitting Vertical forces to said members, said web of the tension member being bifurcated from a point above the inner upper edge of the box to define inclined webs merging into the inner faces of the juncture of the compression and tension members immediately adjacent the transverse rib.

7. In a side frame, compression and tension members converging outwardly and joined to each other and to an integral journal box, a tension member having its bottom wall or web spaced above the inner edge of the box, diagonal ribs joined to the sides of the tension member and the upper inner edge of the journal box for transmitting transverse forces from the journal box to the tension member, a relatively heavy transverse rib on the journal box roof, and auxiliary non-continuous diagonally disposed ribs spaced respectively outwardly and inwardly of said heavier rib joining at the side walls forming the intersection of the tension and compression members, said side Walls being of reduced thickness between the outwardly disposed auxiliary ribs and the main central transverse rib, said transverse rib and ribs operating to transmit vertical forces to the intersecting resistance lines of the tension and compression members.

8. In a side frame, compression and tension members having their outer ends converging and joined to an integral journal box, and means formed on the roof of the box and extending upwardly with respect thereto and joined to the inner faces of the sides of the juncture of the compression and tension members, said sides being reduced in thickness between said means and the bottom edge of the tension member, said means operating to transmit vertical loads directly to the tension and compression members, said means comprising a relatively heavy transverse rib located at the center of the roof and having a horizontal intermediate portion and abruptly ascending end portions joining said juncture, and auxiliary noncontinuous ribs disposed on both sides of said continuous rib and assisting said first named rib in transmitting vertical forces to the juncture of the tension and compression members.

In testimony whereof we affix our signatures.

EDITH R. SYMINGTON, THOMAS R. SYMINGTON, Ewecutors 0f the Estate of Thomas H.

Syme'ngton, Deceased.