US1592273A

US1592273A - Rolled-steel brake shoe and process for the manufacture thereof

Info

Publication number: US1592273A
Application number: US758292A
Authority: US
Inventors: Walter J Kelly
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-12-23
Filing date: 1924-12-23
Publication date: 1926-07-13
Anticipated expiration: 1943-07-13

Description

July 13 1926. 1,592,273

w. J. KELLY ROLLED STEEL BRAKE SHOE AND PROCESS FOR THE MANUFACTURE THEREOF Filed Dec. 26, 1924 M/ A221 r.

' so far as I am advised nopractical and shoe with the lugs fully deformed and the PATENT OFFICE.

wanna .1. nanny, or remrmnn, mum.

nounn-srnnn ram sno'n m rnocnss non. rm: mun-scrum: IHEBEOF.

Application fled December 23, 1924. Serial No. 758,292.

My invention relates to a new and im proved type of brake shoeformed of rolled steel and to a novel process for the production of the'sa'me.

At the present time the brake shoes in:

commercial use are formed of cast iron and economical process has been devised for the production of rolled steel brake shoes which are obviously desirable for durability and strength.

I have conceived that if a process can be devised by which the brake shoes can be rolled cheaply, a steel brake shoe can be produced at a cost which will enable it to be marketed in competition with the cast iron brake shoe,-and to this end I have devised a process for the rolling of the brake shoes which is based upon the novel conception of rolling the body portion of the shoe from a narrow billet with the rolls shaped to provide upon-the back of the rolled bar a pair of symmetrically disposed longitudinal webs or ribs of such character that they can be readily sheared to provide lugs which are shaped or can be deformed to form the retaining, the alignment, and the key lugs constituting the present standard means for the mounting of the brake shoes on the head.

In the practice of my process, the continuous longitudinal webs on each bar section are cut away leaving an opposed pair of central lugs and at each end two pairs of opposed lugs, one pair of which is adapted for outward deflection to form the retaining lugs, while the center pair of lugs is adapted to be bent inwardly to form the key lugs. The brake shoe, after the forming operation, is case hardened in accordance with the best practice ,in the art and the resultant product is a. rolled brake shoe produced economically and of maximum serviceability.

In the accompanying drawings I have illustrated the preferred embodiment of my improved type of brake shoe and have illustrated the difl'erent stages of its manufac ture.

According to the drawings Fi 1 is a perspective view of a finished rolle steel brake shoe in accordance with my invention.

Figs. 2 and 3 are side and cross sectional dividual brake shoe formedby-shea the strip to lengths and by shearing the we to form the shoulders.

Figs. 5 and 6 are. sectional views taken on the lines 5-5 and 6-6 of Fig. 4. i

; Fig. 7 is a plan view; and.

finished brake Fig. 8 is a side view of the shoe shaped to the wheel curvature.

Similar reference numerals refer to similar parts throughout the I i As illustrated in the drawings, the billet is rolled to produce a bar having the section shown in Figs. 1 and 2, the steel comprismg a body 1 and a pair of symmetrically disposed longitudinal

vertical webs

2 and 3 which extend continuously for its full length. The body 1 has a cross section corresponding to the desired cross sectio for the brake shoe. The bar as thus produced is sheared transverselyto the lengths shown in Fig. 4 and in this same operation the webs are cut away so as to leave a pair of opposed center lugs 5 and at each end two pairs of opposed similar lugs 6 and 7 The

lugs

5 and 6 have the full height of the web but the lugs 7 are shorter and these latter lugs form the alignment lugs of the finished brake shoe 8 and are not treated after the shearing operation. In the succeedin operation the body ortion of the sheare bar section is shape to the desired wheel curvature, the end lugs 6 are deflected outwardly to form the retaining lugs and the center lugs 5 at their upper ends are bent over inwardly at 9 to form the key In all as shown more clearly in Fig. 1. Thefii rake shoe 8 after being thus formed is ready for.

the hardening process, and after being hardened is ready for service.

From the foregoing it is obvious that the desired section can be rolled in one operation, that the rolled bar and its webs can be sheared in a second operation, and that the bar can be shaped and its lugs deformed in a third operatlon, thus reducing to a m1 n1- mum the operations required for the formation of a rolled steel brake shoe.

I claim as the di my invention the fact th t the section is rolled with the webs on the back from which the lugs can be provided in a single shearing operation.

Though I have described with great partlcularitw the details of the embodiment of the invention herein shown, it is not to be construed that I am limited thereto, as changes in arrangement and substitution of equivalents may be made by those skilled in the art without departing from the invention as defined in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters-Patent, is:

1. A rolled steel brake shoe of the character described, comprising a section of a rolled bar having the transverse cross sec tion of a brake shoe and having rolled integral webs projecting from its convex surface and disposed in opposite pairs and deformed to form key and retaining lugs.

2. A rolled steel brake shoe of the character described, comprising a section of rolled bar having the transverse cross section of a brake shoe and having rolled integral webs on its convex surface disposed and deformed to provide mounting elements for the shoe.

3. A rolled steel brake shoe of the char-acter described, comprising a section of rolled bar having the transverse cross section of a brake shoe and having rolled integral webs on its convex surface disposed and deformed to provide all of the mounting elements for the shoe.

4. A rolled steel brake shoe of the character described, comprising a section of a rolled bar having the transverse cross section of a brake shoe, and having rolled integral longitudinally disposed webs on its convex surface disposed in opposite pairs imd deformed to form key and retaining ugs.

5. A rolled steel brake shoe in accordance with claim 4, which has at each end in addition to the deformed webs, non-deformed rolled webs forming alignment lugs.

6. A rolled steel brake shoe of the character described, comprising a rolled steel bar section curved to correspond to the wheel curvature and having on its convex face integral rolled webs formin at each end two pairs of opposite lugs of different heights, the outer lugs being outwardly deformed to form retaining lugs, and having a pair of rolled center webs which are inwardly deformed to form a key lug, substantially as described.

7. A rolled steel brake shoe of the character described, comprising a rolled steel body formed integrally with five pairs of lugs on its convex surface, said lugs being arranged in parallel longitudinal vertical planes equi-distant from the longitudinal center line of the shoe and formed-from upright rolled webs, the end lugs being outwardly deformed to form retaining lugs, the inner adjacent end lugs being shaped and disposed to' form alignment lugs, and the center lugs having their tops bent inwardly towards each other and shaped to form a key lug.

In testimony whereof I afiix my signature.

WALTER J. KELLY.