US1111017A - Back for brake-shoes. - Google Patents

Description

J. D. GALLAGHER.

BACK FOR BRAKE SHOES.

APPLICATION rum) my 2, 1913.

1 ,1 1 1 ,Q1 7, Patented Sept. 22, 1914;.

UNITED srA'rns Parana OFFICE.

JOSEPH D. GALLAGHER, 0F GLEN RIDGE, NEW JERSEY, ASSIGNOR TO AMERICAN BRAKE SHOE & FOUNDRY COMPANY, OF MAHWAH, NEW JERSEY, A CORPORATION on NEW JERSEY.

a citizen ofthe United States, and a resident of Glen Ridge, in the county of Essex and State of New Jersey, have made and invented certain new and useful Improvements in Backs for Brake-Shoes, of which the following is a specification.

My invention relates to an improvement in backs for brake shoes, and more particularly to that type thereof wherein is employed a wrought metal key lug, for attaching the shoe to the brake head.

It has been found in practice that when a key lug is formed from a strap of wrought metal, and has a top and two vertical walls or sides, each of a single thickness of metal, equal to that of the thickness of the strap from which it is made, the edgesof the wrought metal lug cut and injure the central toes formed on the brake head which straddle the key lug, in some instances the central toes being entirely cut away, and the brake head rendered totally unfit for further use.- This injury occurs by reason of the loose fitting of the shoe to the head, I

it being customary to allow a certain amount of play between the two when assembled, the consequence being that the constant hammering of the edges of the walls of the key lug against the central toes of the brake,

head cuts or injures them, and in time totally destroys them. In order to overcome this objection, it has heretofore been proposed to reinforce the vertical walls of the Wrought metal key lug with cast metal projections on the body of the shoe, whereby to present a much wider or broader surface to .the central toes of the brake head, and

prevent the sharp cutting edges of the key lug from coming in contact with such toes.

These means have been successful in over coming the injury to the head, but the reinforcing cast metal being of a brittle nature, is liable to be cracked, injured or broken away, in loading or unloading and during transportation of the shoes on the scars, thus leaving the key lug in a condition 'to injure the brake head as above described.

Furthermore, this wrought metal key lug is usually made of a separate piece of metal from that of which the back is formed, the

consequence being that the lug, when the a shoe is in service, is sometimes pulled out .01

Specification of Letters Patent.

BACK FOB BRAKE-SHOES.

Patented Sept. 22, 191a.

Application filed May 2, 1913. Serial No. 765,009.

separated from the back, thus rendering the shoe useless. The object of my invention is to construct the key lug with integral plates, so disposed that they will present a wide bearing surface to the central toes of the brake head, the plates being of substantially the same height as the lug itself, and of a width substantially equal to that of the back, the result being that the key lug is materially strengthened, and all danger of cutting or injuring the brake head avoided.

With this and other ends in view, my invention consists in the improved back for brake shoes and in the blank illustrated in the accompanying drawing and hereinafter described and claimed, and in such variations and modifications thereof as will be obvious to those skilled in the art to which my invention relates.

In the drawing wherein the preferred embodiment of my invention is illustrated; Figure 1 is a view showing a brake shoe in perspective with one of my improved backs embedded in the rear surface or back thereof; Fig. 2 is a view showing the back itself in perspective, and separate from the shoe;

Flg. 3 is a view showing the blank from which the back is formed in perspective;

Fig. tie a view showing the back and shoe in section upon a transverse plane extending through the attaching lug of the shoe; and Fig. 5 is a similarview showing an alternative method of embedding the back in the cast metal body of the shoe.

Referring to the drawing, the reference numerals 6 designate two sides of the back, which sides extend longitudinally of the castmetal body portion 7 of the shoe in which the back is embedded, and which sides are connected with one another by the upwardly extending attaching lug 8 through which lug the shoe may be secured to and supported from a brake head by means of a suitable key, as is usual in brake mechanism. The lug 8 is commonly located at the middle portion of the shoe as shown, and may project free from the rear surface thereof, as shown in Fig. 4, or may be reinforced by lugs 9 rising from the body of the shoe and formed as the shoe is cast, as shown in Fig. 5; which lugs inclose the attaching lug to a greater or less extent as may be deemed desirable and in accordance with well known practices in vogue i i in the brake shoe art. These sides 6 are also preferably connected at each end of the back by the bridge pieces 18.

Figs. 1 and 2 of the drawing. The lower v ends of these plates rest. upon, or are embedded in, the rear surface or back of the brake shoe, and are commonly provided with anchors 12 designed to be embedded in the back of the shoe and so shaped that the cast metal of the body will secure a firm grip upon them to thereby lessen the liability of the lug being pulled from the body of the' shoe when. the same is in use. The plates themselves obviously interpose great resistance'to forces tending to crush or -distort the attaching lugfofwhlch they form a part,

their large area providingan extended bearlngxsurfaceto take the thrust between the attaching lug and the central lugs of the p brake head, which lugs lie upon each side of iron" lug.v 5 he back the attaching lugv when the shoe is in-use. The lugs of the head bearingagainst large surfaces, are not cut or injured by the narrow upwardly extending sides 13 and top 8 of the lug as would be the case if the plates inquestionwere not interposed between the said sides and the thrust absorbing lugs oftheibrake head, the effect of this lug on the brake head being the same as that of a cast is formed from an integral or single piece blanlrof the form shown in Fig. 3, which blank'is cut from sheet or thin plate wrought iron or mild steel stock of a thickness of oneeighth to three-sixteenths of an inch, or thereabout, which blank is. subjected to appropriatebending and shaping processes by means of a suitable press-to produce the finished back. The longitudinally extending sides 14 of the blank, which provide the sides 6 of the finished back, are farther apart at the. middle than at the end of the blank, so that when the centrallylocated connecting bar 15 of the blank is bent to provide the attaching h1g8 of. the back, the middle portions of the sides of the blank are brought toward one another and a back of approxiwith a key lug, said lug comprising'side walls and a' top plate, and vertical transverseplates formed integral with the edges of said, top plate and. extending. substanmately uniform width produced The plates 10 and anchors 12 theblank having projecting portions 17 the plates being integrally connected with the central portion of the connecting bar 15, the said elements being bent during'the shaping operations to which the blank is subjected to produce the plates 10 located upon each side'of the attachin'glug Sof the finished for brake shoes above described above referred to are provided for by plates 16 of back, and the anchors 1'2at the lower ends of j the plates, and lying between the sidesof the tha i he an-afar finished back, as shown.

It will be understood having been given the-formgshown in 'nFig. 2, is properly placed within aimold in; which a. brake shoe is to be formed, and molten metal poured thereinto, whereupon the back becomes embedded in the cast metal of the". .body .of the shoe."

From the foregoing it will be understood that the back is continuous from end to end,

and that it is embedded, or partiallylsq'in the body metal of; the shoe throughout-its entire length, including those portions about ,1 midway of the lengthoftheback which have heretofore been bent or struck upwardly in v order to form the attachingor keylug. In other words, instead ofembedding'into the body metal of the shoe those portions, only tegral.

What I claim is:

of the back which extend from the key lug to the ends of the shoe, the entire back is embedded. from end. to" end, the back and key lug at the same time being made in 1. A. back fora brake shoe provided with a key'lug, said key lug being formed with side walls and a top, and transverseface plates extend ngjsubstantiall'y across said.

' back.

i 2. A back for abrakeshoe constructed with. a key lug, said lugbeing provided with. 7

7 side and top plates, and with vertical trans verse face plates extending substantially to the outer edges of" said back.

3. back for brake shoes constructed with side walls and a top plate and with vertical transverse face plates of greater equalheight and of" greater length than the width of said key lug. 5. A back for brake shoes with a key lug, said key lug being provided constructed with an integral key lug, said key lug com.-

prising side walls atop plate, and vertlcal transverse face plates formed integral with said key lug and of substantially the a same height and of greater length than the wldth of said key lug,

6. A back for brake: shoes constructed tially across said back.

ishoe, and a key lug formed integral with said back, said keylug being provided with transverse vertical face plates extending substantially from one edge of the back to the other. 1 A

8. A back for a brake shoe formed of two sides of substantially the length of the body of the shoe, and continuous throughout their length, said sides being adapted to be embedded from one end to the other in the body ofthe shoe, and an integral key lug connecting said sides and provided with integralvertical transverse plates of substantially the same height as said lug and extending substantially from one edge to the other of said back.

9. A back for a brake shoe having two continuous longitudinally extending sides substantially the length of the shoe and adapted to be embedded in the cast metal of the shoe throughout their length, and a centrally located upwardly extending attaching lug integral with and connecting said sides with each other and having two apertured integral face plates located one upon each side of said lug and of substantially equal height therewlth and extending across the back.

10. A back for a brake shoe constructed with two sides running substantially the length of the shoe, and with an integral key lug, said lug being formed with integral transverse vertical face plates extending substantially across the back.

11. A back for a brake shoe constructed of one piece of metal and comprising two sides running substantially the length of the brake shoe to which the back is applied; a key lug connecting the two sides, saidkey lug being integral with the back and formed with transverse vertical face plates extending the height of the lug and substantially across the back.

12. A back for brake shoes comprising two sides extending substantially the length of the brake shoe to which said back is applied, and a key lug formed integral with said sides, said lug being formed with vertical transverse face plates, said plates being formed integral with the edges of said lug and extending the height of said lug and substantially across said back, each of said plates being provided with an aperture for the passage of the key therethrough.

13. A back for brake shoes formed from sheet metal and having two longitudinally extending sides and an upwardly extending attaching lug connecting said sides with one another, and two apertured plates connected with and located one upon each side of said lug and the lower ends of which plates terminate adjacent the rear face of the shoe when the back is embedded therein, to thereby strengthen said lug.

14. Aback for brakeshoes formed from sheet metal and having two longitudinally extending sides and a centrally located upwardly extending attaching lug connecting said sides with one another, and two aper tured plates located one upon each side of said lug and thelower ends of which plates are provided each with be embedded in the boddy of the shoe.

15. A back for brake shoes formed from an integral sheet metal blank byysuitable:- bending tudinally extending sides and a centrally 10- operations and having two longicated upwardly extending attaching lug connecting said sides with one another, and two apertured plates located one upon each side of said lug and extending transverse to the back and the lower ends of which plates are provided each with an anchor adapted to be embedded in the body of the shoe.

16. A back for brake shoes formed from an integral sheet metal blank by suitable bending operations and having two longitudinally extending sides and a centrally located upwardly extending attaching lug connecting said sides with one another, and two apertured plates located one upon each side of said lug and extending transverse to the back, the upper ends of said plates being connected with the middle portion of said attaching lug and the lower end of each plate having an anchor located between said .sides and adapted to be embedded in the body of the shoe.

17. A back for brake shoes formed from an integral sheet metal blank by suitable bending operations and having two longitudinally extending sides and a centrally located upwardly extending attaching lug connecting said sides with one another, and two apertured plates located one upon each side of said lug and extending transverse to the back and the free endsof which plates extend beyond the ends of said attaching lug, the upper ends of said plates being connected with the middle portion of said attachlng lug and the lower end of each plate having an anchor located between said sides and adapted to be embedded in the body of the shoe.

18. An integral blank for a back for a brake shoe formed from sheet metal and having two longitudinally extending sides, a centrally located connecting bar, and two apertured plates located one upon each side of said bar and each of which plates is provided with an anchor.

19. An integral blank for a back for a brake shoe formed from sheet metal and having two longitudinally extending sides farther apart at their middle portions than at their ends, a centrally located connectin bar, and two apertured plates connected with the central portion of said connecting bar an anchor adapted to a and located one upon each side thereof and Signedat New York; borough of Manhat= 10 each of. which plates is provided with an tan, in the county of] New' York and-State anchor. n n -of New York, this20th day of April, A. D. 20. An integ al blank for a brake shoe 1913.' I I back formed; from sheet metal and having JOSEPH" D ALLAGHER two longitudlinally extending sides, a centrally located connecting bar, and two aper- Witnesses: v tunedi plates located one'upon each side of "MARY B.JUS'1ICE said bar. ANNA V; WALSH.

Copies otthisipate nt maybe obtained forfive cents'each, by addressing the Commissioner bfi'ht'ent, Washington, D. 0'. T

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