US926875A - Method of forming steel backs for brake-shoes. - Google Patents

Description

H. JONES.

METHOD OF FORMING STEEL BACKS FOR BRAKE SHOES.

APPLIOATIOH FILED JUNE 26, 1908.

926,875. Patented July 6, 1909.

Hrokur UNITED STATES PATENT OFFICE.

HARRY JONES, 0F SUFFERN, NEW YORK, ASSIGNOR TO EDWARD H. FALLOWB, OF NEW YORK, N. Y.

n'rnon or roams s'rnnL BACKS son BRAKE-SHOES.

Specification of Letters Patent.

Patented July 6, 1909.

A uemtn flied June 20, ons. semi no. mass.

To all whom it may concern:

Be it known that I, HARRY Jonas, a citizen of the United States, and a resident of Suflern, in the county of Rockland and State of New York, have made and invented certain new and useful Improvements in Methods of Forming Steel Backs for Brake-Shoes, of which the following is a specification.

My invention relates to an improved method of forming steel backs for brake shoes. As is well known to those versed in the art, these backs made of malleable, wrought, or other tough, ductile metal, usually known and referred to as steel backs, are applied to the cast iron body of the shoe at or ad'acent to the back thereof, and are provide with holes or openings'for the urpose of allowing the cast metal to ow through the same and anchor it to the body bfi the metal overflowing the outer ed es of t e steel back and the edges of the ho es or openings. To render this anchorage more e ective, it is desirable that the outer edges of the steel back and those surroundin the openings therein, be cut or formed on a evel or incline, but while there is little orno dillicult in so shaping the outer edges ofthe stee back, more or less trouble has been experienced in beveling the ed es of the openmgs. B m im rovedmet 0d, hereinafter described: all di culty in this operation is avoided, as I have found in. ractice that steel backs may be constructs or produced with beveled openings quickly and at a small cost.

My improved method contemplates, first, crimping or bending the plate transversely; secondly, punching o enings therein while in its bent or crimped orm, and finally, properl y shaping it transversely.

0 more clearly describe these operations I have shown the steel back in its several stages of formation in the accompanying drawings, in which Figure 1 shows in perspective the plate from which the steel back is to be formed. Fig. 2 shows the plate bent or crimped. Fig. 3- is a sectional view taken on the line 3-3 of Fig. 2. Fi 4 is a similar view taken on the line 4,-4 0 Fig. 2. Fig. 5 is a'view of the late after being crimped and punched. Fig. 6 is a longitudinal sectional view taken on theline 6-6 of Fi 5. Fig. 7 is a sectional view taken on t e line 77 of Fig. 5. Fig. 8 is a sectional view of the finished back,

and 9 is a sectional view taken on the line 99 of Fig. 8.

In practice the strips or iates A from which the steel backs are to e formed, are made of the proper width and length. By means of suitable tools this plate A is crimped or bent as illustrated at B into concavo-convex form, as illustrated in Figs. 2, 3 and 4, or

at such place or laces where it is desired to unch or otherwise form the openings there- In. The crimped late is then sub'ected to the action of suita le dies or punc es, (not shown), for the purpose of forming the openings C, the sides or edges of the openings being vertical, as illustrated in section in Fig. 7. Finally, the plate is given its finished shape, that is, is curved longitudinally in its length, as illustrated in Fig. 8, and flattened transversely, as illustrated in Fig. 9. It will be readily understood that by thus forming the openings while the plate is in its bent or crim ed form, said edges will take on the bevel or incline when the plate is straightened or flattened transversely, these operations enabling me to form the lates far more expeditiously and economica ly than is possible by forming the same with beveled openings while straight or fiat in transverse section. As a matter of fact, I form these backs from a 1011 stri of metal having the proper width, w ich eing inserted into a machine (not shown), crimps and punches them at one operation, and the strip being advanced, the machine cuts them off to proper length. This crimped and punched plate is then sub'ected to a second machine, which curves it 1n its length and flattens it transversely, thereby completin it. As the machine itself forms no part 0 the present invention, it is unnecessary to illustrate or describe it. It will of course be understood that instead of crimping orbending the plate at those places where it is desired to form the openings, the entire plate may be crimped or bent and subse uently straightened, as above described, an furthermore, that while I have shown but two'openings in the plate. any desired number ma be formed therein. Again, if it be desired, t e outer' edges of-the plate maybe cut out as illustrated at D for the accommodation of a key-lug (not shown),

these cuts being formed simultaneously with the formation of the openings C. Finall it will be understood that the outer ed es 0 the plate may be beveled at any stage 0 the-for mation of the plate, this not being illushaving vertical Walls, and finally flattening trated as it is not essential. the same transversely and curving the plate Having fully descrlbed my invention, what I in its length. I claim as new and desire to secure by Leti Signed at Sufl'ern, in the county of Rock- 5 ters Patent, is

Themethodhereinbefore described of formof June, A. D. 190

ing backs for brake shoes with beveled 0 en- HAR RY JONES.

ings, consisting in first crimpin or ben ing Witnesses: the Blate in cross section, secon y, punching FRANK S. HARRIS, ent portion of the plate wlth an opening M. B. WARD.

10 the land, and State of New York, this sixth day 1"

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