US2672957A - Brake head - Google Patents

Description

s. sABo BRAKE HEAD March 23, 1954 3 Sheets-Sheet 1 Filed qan. 15-, 1950 TOR. 5M0

' JNVEN .Li i gp ezz BY March 23, 1954 s, sAg-o 2,672,957

BRAKE HEAD Filed Jan. 15, 1950 3 Sheets-Sheet 2 INVENTOR.

INVENTOR.

v 3 Sheets-Sheet 3 S. SABO BRAKE HEAD Sign/2 372 jaa March 23, 1954 Filed Jan. 13, 1950 Patented Mar. 23, 1954 BRAKE HEAD Stephen Sabo, Hammond, Ind., assignor to American Steel Foundries, Chicago, 111., a corporation of New Jersey Application January 13, 1950, ;Serial No. 138,445

1 Claim.

This invention relates to railway brake equipment and more particularly to a novel brake head.

The general object of the invention is todesign anovel brake head of simple design capable of being fabricated by forging. v

. Another object of the invention is to devise a novel fabricated brake head of economical construction and having greater strength than conventional cast steel heads for resisting the severe stresses of railway service.

These and other objects of the invention will become more apparent from the specification and the draWing'sQwherein:

Figure 1"is a side elevational viewof a brake with head made in accordance with the invention a brake shoe applied thereto;

Figure 2 is a front view of the brake head;

Figure 3 is a rear view of the brake head;

' Figure 4 is a transverse sectional view taken in the plane indicated by the line 4-4 of Figure 1;

Figure 5 is a sectional view taken substantially in the plane indicated by the line 5-5 of Figure 1;

Figures 6 to 19 show the steps in a novel process by which the head is fabricated, Figure 6 being a view of one side of a billet;

Figure 7 is an end view of the billet;

Figure 8 shows the billet with a tonghold drawn;

Figure Q'shows the rolling process;

Figure 10 is a side view of a blank formed by flattening the billet shown in Figure 9;

Figure 11 is an edge view of the blank in Figure 10 Figure 12 shows the blank after being subjected to a. forging operation;

Figure 13 is a sectional view taken on the line 13-13 of Figure 12;

Figure 14 shows the blank in Figure 12 after trimming and punching;

Figure 15 is a transverse sectional view taken on the line |5I5 of Figure 14;

Figure 16 is a side elevational view of the brake head after bending the piece shown in Figures 14 and 15;

Figure 17 is a. transverse sectional view taken on the line I l-l'! of Figure 16; and

Figures 18 and 19 are comparable to Figures 16 and 17, respectively, and show the brake head after a coining operation, Figure 19 being a sectional view taken on the line 19-19 of Figure 18.

Describing the invention in detail, the brake head, generally designated 2, comprises spaced generally parallel side walls 4 and 6 somewhat shaping of the billet by a triangular in shape in side elevation. The sidewalls are provided with central bearing portions 8 and I 0 at their rear edges, said bearing portions projectingfrom the inner sides of the walls. The bearing portions 8 and III are aligned transversely of the brake head and are provided with aligned. transverse hushed openings I2 and I4 to afford a. mounting for the brake head on an associated pivot member, such as a brake beam (not shown), as will'be readily understood by those skilled in the art. The upper and lower end portions I 6,. 16 and 18, $8 of the side walls diverge away from each other. The forward edges of the side walls are integral with the rear side of an arcuate front wall 29 which extends laterally transversely of the side walls. It will be noted that the side walls are offset intermediate their ends inwardly of the lateral edges of the front wall to provide a rigid structure.

The forward face of the front wall of the brake head has indentations '22, 22 spaced longitudinally of the front'wall, he indentations being spaced in such manner a to provide a central lug 24 between the indentations and end lugs 26, 26 at the top and bottom ends of the front wall. The central lug 24 is formed with a substantially square opening 28 which. isopen through the front and rear sides of the front wall, said opening 28 receiving therethrough a center lug 30 on a brake shoe 32.,the brake shoe extending across the front wall and seating as at 34 against the forward face of the center lug its opposite ends as at 35, 36 against the forward face of the end or toe lugs 26, 26. The brake shoe is provided with toe lugs 38, 38 at opposite ends which overlap the outer ends of the toe lugs 26, 26 and seat thereagainst as at 40, 40. The head is secured to the brake shoe by a key 42 which is disposed behind the front wall of the brake head, the key extending through a slot 44 in the center lug 30 of the shoe.

It will be noted that the central lug 24 and the toe lugs 26, 26 are formed as forwardly 011-- set portions of the front wall and extend the full width of the front wall. This arrangement, coupled with the offsetting of the side walls inwardly of the lateral edges of the front wall of the brake head, provides an exceptionally strong and rigid brake head structure. It will be noted that the portions l6, l6 and I8, H! of the side walls 4 and 6 are vertically coextensive with the respective toe lugs.

In the manufacture of the brake head described, billet stock 50, preferably of square cross section, is cut to appropriate length slightly 24 and adjacent lindrical portions 56, 56 at opposite ends thereof? the cylindrical portions being formed with bulbsone end portions 58, 58. The billet is then subjected to a flattening operationAEigu 11) The flattening operation stretchessth'e metal in a single plane to form a blank cruciform in shape with a widened centerportion; 601., The

blank piece shown in Figures 10 and 11 is then ,esitmsand;

inserted into a suitable press and subjected-tea forging operation. In th forging operation the blank. is flattened further and is, offset intermee: to: provide.:,the-- diate its lateral edges as; at, 61'. frontwall 20 of thebrake head andgto. provide, the bosses l2 and the, piece as viewed in Figure, 12,-afterythe forge. ing operation is somewhatdiamondeshaped and 3 that the excessmetal shown .at,6:2- is left; around the, periphery. This forging: operationt reduces; the metal thickness as. at. 63, 6,3: at .;the; lateral,- edges of wall 20. and, prepares-the piece. f OlliblIlQ-s; ing, by, placing. the rear, surfaces v65, 65 facing away, from wall. 20 in tension andithe opposite;

or front surfaces 61 6], incompression.v After-a forgingloperation.thepiece is subjected, to a trima ming and, punch g, operation in order: to trim Offi'lihe Q CBSS metalitz, alldtq punizhrthe npening,

28 in the, center of the, brake head wa11 2 0-; The piece is then subjected to a bending; Operationwherein portions, 64,, 64 at oppositeredges. ofthe wall 2.0 of. the brakerhead are. bent. away-from wall zll'toward each other to .provide the spaced 61 of. the.- brake head. I

parallel side walls 4f-and, Thebending of the, lateral portions. of therblank. to form the side walls,

theistresses at6 3,.6 3;j The brakehead is thenr subjected to a coining ,operation ,whereatLthesidie walls areofiset inwardly of'th 1 lat,eral edgesofi he rontw 'll O the rake head andsthe forward; The

edges of -the side walls; appropriately flared'.. sidexwalls are;

the bushingsarefltted.

l4 offset outwardly; oft-the; opposite. side ofthe-piece. It;willb -noted that substantiallj neutralizes;

V I then ,drilledthrough, th bosses. 4;.-. and 6; to" provide alignedjopenings into which A brake head made in accordance with this process possesses unusual strength not only because of the arrangement of the various sections thereof but also because the metal is kneaded to provide characteristic flow lines of forged metal, residual stresses are avoided, and the metal is compressed in the areas where it is most subject to; wear at the lugsrZB; 26,, thereby more effectively-resisting wear.

I claim:

A forged brake head comprising a front wall and-spaced side walls integrally connected thereto, said side walls being bent from said front wall to approximately. parallel relationship, said side wallshaving' upper segments, respectively, diverging'from each other upwardly to the upper ends of,said, walls,,said side walls having lower segments, respectively, diverging from each other downwardly to the lower ends of said walls, and said side walls having their forward external edges. diverging outwardly and forwardly from eachfothenfrom the upperven'dsioi the upper segments to the lower ends of the lower segments;

saidzftont wall beingcurved? concavelw from its upper-Ate. its lower toe .-lugs, and asloti through saidcenter lug extending entirely through said front wall and com.-

municating .withthe space between-said side walls References Cited in the: file; of thisspatent' UNITED'-'- STATES" PATENTS Number Name, Date.

1,027,581 Armbrust- May: 28, 1912 1,126,817.47 Sargent Feb 2,.1915 1,160,5153 Sargents N0v.,16, 1915 1,964,601 Schaefer June 26, 193.4 2,031,184. Spiller Feb.- 18,1936 2,068,015; Gannett' Jan; 19, 1937* 2,193,592,; Harbert Mar. 12, 1940 2,257 23 ,728 Baselet: Sept, 9; 1941 2,561,297 Tack ,u1y -17', 195 1 FOREIGN PATENTS- Number Country Date 38,082 Denmark Oct. 24, 1927' 711,531 France Sept: 11, 1931 722,024 France Mar; 10, 1932' end and:v having indentations on its forward surface defining-a center-lug and

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