US1447799A - Lug for brake shoes - Google Patents

Description

Mar. 6, 1923.

' I G. L. MCINTYRE LUG FOR BRAKE SHOES Filed Oct. 8,1921 2 sheets-sheet 1 G. L. M INTYRE LUG FOR BRAKE SHOES Filed 001; a, 1921 2 sheets-sfieet .2:

' Patented ar. e, 1923.

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GUY 1. .1 McIN'IYBE, orrrrrsnuncn', PENNSYLVANIA; ASSIGNOROF ONE-HALF "ro MURRELD a.- ne sermon, on BELL'EVUE, rnnnsynvnnm.

LUG FOR BRAKE SHOES.

Application filed October $1921. Serial No. 506,258.

To all whom it mayconcern:

-Be it knownithat I,;GUr L. MoIN'rYnn, a citizen of the United States, and resident of Pittsburgh, in. the county 7 of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Lugs for Brake Shoes, of which the "following is a specification; This invention relates to a connecting lug l'or brake shoes. i

As is wellknown-in the art of brake shoe pinanufactura -a connecting-lug secured to the back of the brake shoe is utilized for connecting the brake shoe to a brakehead or hanger. l Thecbject 'of'the present invention is to provide a lug which comprisessimplemeans forfirmly securing the lug to thebackof a pressed metal brake shoe shell in such manner as to weaken the back of the shell to a minimum degree. l I

. Further objects of the invention are' toprovide lugs which may be readily pressed from sheet metal; and which presents a maximum strength, particularly in resistance to crushing strains for the thickness of metal from which the-lugsare pressed.

In the accompanyingdrawings Figure 1 is a plan view of the punching from which the lug is pressed; Figure 2 is a plan view showing the lug in position on the back of a brake shoe; Figure 3 is an end elevation of the lug; Figure 4 is a side elevation of the lug; Figure 5 is a plan view of a lug of modified 35, dimensions relative to the shell of the brake shoe; and Figure 6 is a cross'sectional view on the line 6-6 Figure 5.

The lug of the present invention is pressed from sheet metal by an operation distinct 40 from that by which the brake shoe shell proper is formed. The punching from which the lug is pressed is shown in Figure 1 of the drawings. This punching comprises a central portion 1 for constituting the back of 45 the lug, and end portions 2 which constitute the ends or legs of the completed lug and are joined to the central portion of the punching by narrower neck portions 3. Each of the end portions 3 has wings 4 extending 50 laterally from each side thereof, and a tongue 5 extending longitudinally therefrom.

When pressed'into its completed form the central portion 1 of the punching forms the back 6 of the lug, while the end portions 2 of the punching formtheends or legs 7 of the lug. The lug when completed is thus not-only an integral structure, but also comprises aback and ends which are solid in construction.

As is usual with the type of brake shoe indicated, the pressed metal shell 8 is filled with a suitable frictional composition 9 to form the body and wearing face of the brake shoe;- this i frictional composition being pressed whilesoft into the shell of the shoe. The pressed lug must obviously be attached to the shell 8 before the shell is filled with the composition. To attach the lug the tongues 5 are inserted through slotsextending longitudinally of the shell 8, and are theneturned over to engage against the under surface of the back 6 of the shell.

"As the slots for receiving the tongues 5 run longitudinally and not transversely of the: shell 8, the shell is but little weakened by them though: they be madeof any desired width to obtain a strong joint with the shell.

The resistance of the lug to crushing is further increased by other features of its construction which reinforce-the lug while leaving reasonably small apertures in its sides for the reception of the key which looks the brake shoe to the brake head. This is effected during the operation of forming the lug by turning in both of the Wings 1 on each of the end portions 2 of the punching toprovide skirts 10; and by turning down the central portion 1 of the lug along the edges to provide depending flanges 11. It will be observed that, as the end portions 2 of the, punching are connected to the body portion 1 by the narrower portions or necks 3, the depending flanges 11 contact the upper extremities of the skirts 10. It will be seen that the structure of the lug is such that it is in effect self-reinforcing.

The skirts 10 and flanges 11 not only serve to strengthen the lug, but also form a key way for the key 13 which attaches the brake shoe to the brake head. The edges of the skirts 10 and flanges 11 may be either smooth or roughened, as shown at 12, in order to more firmly engage the key 13.

The lug shown in Figures 5 and 6 of the drawings is identical in its features of construction with the lug shown in the preceding figures. This lug differs from that shown in the preceding figures only in its length, inasmuch as it extends a greater proportion of the width of the back of the brake shoe shell. As shown, the tongues 5 of this lug must be upturned to extendinwardly of the shell instead of outwardly, as is preferred with the shorter lug shown in the preceding figures. It will be noted that in this longer lug the skirts and flange 11 may be so extended as to provide a key way no greater than in the shorter It will also be noted that Figures 5 and 6 of the drawings show the shell provided with an interiorly disposed plate or strip 14, and that the tongues 5 of the lug not only secure the lug to the shell but also perform an additional function in assisting to secure this plate or strip in position. Itwill. be understood that the strengthening element 14 may be either in the form of'a plate or strip extending longitudinally of the shell to strengthen the back thereof; or may be merely'a relatively short lining plate to support the central portion of the back of the shell, beneath thelug, during the operation of pressing the filling composition into the shell.

' The lug of the present invention thus presents the advantages that it presents an increased resistance to crushing strains, and that the manner of its engagement with the shell of the brake shoe avoids to a great degree weakening such shell.

What I claim is: 1. Anintegral pressed metal lug for attaching'a brake shoe to a brake head having a back and ends of solid construction and a key-way, and members integral with the back and ends of the lug forming the margin of the key-way.

2. An integral pressedmetal lug for attaching a brake shoe to a brake head having a back and ends of solid construction, tongues forming continuations of the solid ends of the lug, and vertically extending skirts integral with said ends and disposed substantially at right angles to the bodies thereof.

3. An integral pressed metal lug for attaching a brake shoe tofia'br-ake head having a back and ends of solid'construction, vertically extending skirts integral with said ends and disposed substantially at right angles to the bodies thereof, and flanges depending from the back of the lug along both sides thereof.

4. An integral pressed metallug for attaching a brake shoe to a brake head having a back and ends of solid construction,

and vertically extending skirts integral with hand.

GUY L. lWCINTYR-E. Witnesses: i a

R. M. GAUGHAN, E. B, WAL'rnRs.

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