US1608227A - Side frame for railway-car trucks - Google Patents

Description

Nov. 23 1926.

T. E. MURRAY, JR

SI'DE FRAME FOR RAILWAY CAR TRUCKS Filed May 14, 1924 INVENTOR 7i array, I?

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Patented Nov. 23, 1926.

UNETED STATES PATENT OFFICE.-

THOMAS E. MURRAY, J 1%., OF BROOKLYN, NEW YORK.

SIDE FRAME FOR RAILWAY-CAB.- TRUCKS.

Application filed May 14, 1924. Serial No. 713,152.

My invention aims to provide a side frame which can be economically made of pressed steel reinforced so as to secure a most eflicient distribution of metal.

The accompanying drawings illustrate an embodiment of the invention.

Fig. 1 is a side elevation;

Fig. 2 is a plan;

Figs. 3, 4t and 5 are respectively sections of Fig. 1 on the correspondingly numbered lines.

Referring to the embodiment of the invention illustrated, the frame is made of heavy sheet steel segments welded together. Each of the segments constitutes one side of the frame divided along a central longitudinal line, the flanges at the top and bottom being brought together at the top and bottom joints 1 and 2. Preferably'the welding is accomplished by the method described in my Reissue Patent No. 15,466 of October 10, 1922. The edges are brought together and pressed toward each other and a current is passed across the joint of extremely high ampere strength for a very brief predetermined and regulated period of time. This makes a joint practically equal in strength to the metal itself.

The invention is applicable to side frames of various designs. The design shown is one of standard proportions comprising a straight top chord 3, posts a at the sides of a central opening and a bottom chord comprising a straight portion 5 under the cen tral opening, upwardly inclined portions 6 and straight horizontal end portions 7 thus forming a sort of truss with a central opening 8 of roughly rectangular shape and triangular openings 9. The metal around the edges of the openings is flanged inward for stiffness and the flanges thus formed may meet in the central plane and be welded together as indicated for the flanges 10, Fig. 3, surrounding the central open ng, or they may extend only partly to the center as in the case of the flanges 11 surroundmg the triangular openings (Figs. 4: and 5). The flanges 10 are welded together at 12 by the same operation which welds the top and bottom joints.

The frame may be made of a single stamping bent at the top for example with its edges brought together and welded along the bottom. Or it may be made in various other parts welded together. Various extensions and attachments may be provided according to requirements;

Side frames of this character are subjected to very heavy stresses and the bottom chord is under very heavy tension, much greater than that in the top chord. How'- ever, when the frame is stamped of sheet metal, the metal is of practically the same thickness for the top chord and for the bottom chord; and the practical limit on the dimensions of the parts results generally in a top chord whose total crosssectional area, say along the lines 3-3, 44, 55 of of Fig. 1 is substantially or approximately the same as the crosssection of the bottom chord along these lines. To provide sufficient strength in the bottom chord, it is, therefore, necessary to use a thicker sheet of metal for the whole frame than would be required for the top chord alone. The posts are of heavier metal than necessary because of this requirement of sufficient thickness to withstand the stresses in the bottom chord.

I propose to provide a side frame in which the bottom chord shall be of extra crosssection compared with the top chord. In the case illustrated the extra thickness of metal is secured by a reinforcing member stamped out of sheet metal and placed to best advantage to oppose the strains of use. The reinforcing member is of flanged shape, approximately channel shape. It comprises a web portion extending in approximately straight lines between its points of support and flanges which are reversed at different points in the length of the reinforcement so as to accommodate themselves to the sides of the main frame. The web of the reinforcement, for example, has a central portion 13 hearing up against the underside of the flanges 14 at the bottom of the central opening, end portions 15 hearing down against the top of the flanges of the end portions 7 of the main frame, and intermediate portions 16 extending in substantially straight lines from the center to the end so as to take a straight tensile strain without flexure.

The reinforcement is flanged at both side edges so as to hold it firmly in place. The flanges 17 at the center are gradually bent up as at 18 throughout their middle portions and are bent entirely above the web at their end portions as at 19, Fig. 5, and

again bent over at their edges 20 to fit within the sides of the main frame.

In assembling the parts, the reinforcement may be spot welded or otherwise welded to one of the halves of the frame before the latter are brought together. Or the reinforcenient and the main frame, may be punched as at 21, Fig. 2, for attachment by rivets. Various other schemes may be adopted for securing the necessary attachment of the reinforcement to the other parts.

Though I have described with great particularity of detail certain embodiments of my invention, yet it is not to be understood therefrom that the invention is restricted to the particular embodiments disclosed. Various modifications thereof in detail and in the arrangement of the parts may be made by those skilled in the art without departure from the invention as defined in the following claims.

lVhat I claim is:

1. A side frame comprising segments of pressed sheet steel with inturned flanges united along a vertical longitudinal plane, having top and bottom chords and a separate reinforcement enclosed by and substantially coextensive with the bottom chord.

2. A side frame comprising segments of pressed sheet steel with int-urned flanges united along a vertical longitudinal plane, having top and bottom chords and a separate reinforcement engaging such flanges on the bottom chord, said reinforcement extending continuously from end to end of the bottom chord so as to strengthen it throughout its entire length.

A side frame of pressed sheet steel with top and bottom chords and a separate rein forcement for the bottom chord consisting of a strip of sheet metal bearing upward against a central portion of the bottom chord and downward against the end portions thereof and substantially straight between said' bearing portions.

4. A side frame of pressedsheet steel with top and bottom chords and a separate reinforcement for the bottom chord, consisting of a strip of sheet metal bearing upward against a central portion of. the bottom chord and downward against the end portions thereof and substantially straight between said bearing portions and having flanges extending downward along the central portion and upward along the end portions.

In witness whereof, I have hereunto signed my name.

THOMAS E. MURRAY, JR.

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