US981896A - Brake-shoe. - Google Patents

Description

A. L. STREETER.

BRAKE SHOE.

APPLICATION 11.21) JULY 25, 1910.

Patented Jan. 17, 1911.

WIT

wherein the ductile metal back and body UNI E ania FICE.

ALFRED I1. STREETER, OF CHICAGO, ILLINOIS, ASSIGNOR 0F ONE-HALF TO ILLINOIS MALLEABLE IRON COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

BRAKE-SHOE.

Specification of Letters Patent.

Patented Jan. 17, 1911.

Application filed July 25, 1910. Serial No. 573,658.

To all whom it may concern:

Be it known that I, ALFRED L. S'rRnn'rnn, a citizen of the United States, and a. resident of Chicago, in the Stateof Illinois, have invented certain new and useful Improvements in Brake-Shoes, ofwhich the following is a specification.

My present invention relates to brake shoes and contemplates, first, the provision of an'improved construction of brake shoe, and, second, the provision of an improved process for making said brake shoe.

The brake shoe made according to my improved process and containing my improvements comprises essentially a metal body portion, a Wearing insert of harder metal than said body portion, a suitable means for attaching the brake shoe to the brake head, all of the general form and appearance of a number of different types of shoes made according to present accepted M. C. B. stamiards for freight and passenger car service, though it is obvious thatmy improvements may be utilized for the production of locomotive driver shoes, street car shoes and other brake blocks of divers forms and contours.

The principal objects of my present invention are the provision of an improved type of brake shoe having a ductile metal back and in addition thereto a ductile metal body portion better enabled than others known to me to withstand the shocks of service, and to acconunodate itself to dis tortion of the brake head with which it is used, without fracture and consequent dropping of any portions of the shoe upon thetrack, thereby not only lessening the braking efliciency of the shoe but also giving rise to possible derailment of the car; the provision of an improved form of brake shoe portions thoroughly embrace the relatively rigid insert, and in the event of breakage prevent any portion of the insert from becoming disengaged from the body portion of the shoe and falling upon the track; the provision of an improved brake. shoe comprising in combination a malleable body portion and a less malleable insert; the pro vision of an improved brake shoe especially adapted for use upon steel tired wheels and wheels having specially hard tread portions,

such as the Davis manganese steel wheel; together with such other objects as may hereinat'tcr appear. I

In the brake shoe practice carried on at this day, as known to me, no shoe has thus far been produced which is both adequately strong to meet service conditions and at the same time of suliicient braking quality for satisfactory use with wheels having tread portions of steel or other extraordinarily hard material, without scoring or grooving such treads, which is objectionable in this that such interruption of the continuity of the tread leads to breakage if not promptly removed by dressing, and that dressing of such hard material is both ditlicult and expensive.

In the attainment of the objects above stated, and in overcoming the disadvantages n ted, I have provided a shoe, one embodim at of which is illustrated in the accomtmnying drawing, wherein Figure l is a side elevation of the shoe; Fig. 2 is a view of the back of the shoe; and Fig. 3 is a perspective view of one form of insert which I preferably use in connection therewith.

Referring first to Figs. 1 and 52, it will be observed that the shoe here shown comprises a body portion, 10, having formed integrally therewith an attaching lug, 11, having keyway, 12 (Fig. 2) adapted to receive the attaching key by means of which the shoe is fixed to the brake head. the bifurcated ends of which embrace the end lugs, 13- 13. On either side of the lug, ll, and extending laterally to within, say, lhrewpiarters of an inch ot'the sides, l-lll, ot the shoe and longitrdlinally to within about one inch of the ends. l5-15, thereof, I provide recess. l(;---1(i, in the back. such recess having a depth of about ll\tlXl0(lll'liS of an inch, to the end that when the shoe is fully worn out and must be discarded there will be a minimum amount of scrap ren'iaining, and thus the largest possible percentage of the metal of the body of the shoe will be utilized, rendering the shoe highly economical in service.

Referring now more particularly to Fig. 3. it will be observed that the insert, 17, (shown in dotted lines in Figs. 1 'and 2) extends from the tread about two-thirds of the way to the back of the shoe and throughout substantially the entire length of the shoe (as indicated in the dotted lines in Fig. 1).

provided with a number of deep corrugations or indentations, 22 and 23, thus giving it the appearance of a number of jointed or continuous V-shaped portions, 24, having their acute angled apices directed toward the sides of the shoes. As is clearly to be seen from Figs. 1 and 2, the body, 10, back, 19, and lug, 11, are made of one integral casting, such cast metal being any one of a number of well known compositions of annealable iron, Whereas the insert, 17, here shown as a casting is preferably made of iron of a composition which is less annealable than that of the body of the shoe, even to iron which is substantially non-annealable. If desired, the insert, 17, may be made from a wrought iron or mild steel plate of similar cross section to that shown, and bent into the wavy form clearly apparent'in Figs. 2' and 3.

Ininanut'acturing my improved shoe in preferred form, I place a slightly or substantially non-annealable insert, 17, in inverted position in a mold, and then pourinto the mold annealable iron in such a manner as to first form the lug, 11, and then the back and body, and cause the body, 10, to embrace the insert, 17. The shoes thus produced are placed. in a malleabilizing furnace and treated according to the well known methods of malleabilizing iron. I A shoe is thus produced which has a combined lug, back and body portion of exceedingly tough metal which will'readily accommodate itself to the brake head with which it is used, and at the same time containing a much less annealed, even to the extent of substantially non-annealed insert, of greater total braking capacity. It is obvious that the form of the insert and the degree of annealing to which it is subjected may be substantially modified without departure from the spirit of my in vention, and that I do not limit myself to any particular composition of malleable iron for the body portion, nor of less annealable iron for the insert.

Having thus described. my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent is the follow ng:

1. A brake shoe comprising in combination a malleable iron body containing an insert less annealed than said body.

serene 2. A brake shoe comprising in combination a malleable body and a substantially non-annealed insert.

3. Abrake shoe comprising, in combination, a malleable iron body or shell east about a wearing insert.

l. A brake shoe comprising, in combinetion, a malleable iron body or shell having a malleable attaching lug and cast about. a

wearing insert.

5. As a new article of manufacture a brake shoe comprising a malleable iron shell havin an integral attaching lug, 11, and recesse portions,16, in the back thereof, and a wearing insert, said shelland insert having cast engagement with each other, such shell being annealed subsequently to the implacement of the insert therein.

6. In a brake shoe, in combination, a cast body portion and a Wearing insert comprising a number of continuous acute angled V- shaped portions, 2424 7. In a brake shoe, in combination, a cast body portion and an insert comprising a number of \i-shaped ortions, 24.--24, said portions being relative y thicker in cross sec-- tion adjacent the back of, the shoe, and having their ends joined to form a continuous member. I

8. In a brake shoe, in-combination, a body portion and a Wearing insert comprising a number of continuous acute angled ll-shaped portions, 2 l24l, the apices of said v J- shaped portions being directed to the sides of the shoe.

9. A brake shoe comprising in combina-' iron, the annealable member being annealed subsequently to the implacement of the insert therein.

10. A brake shoe comprising, in combina' tion, a metal body or shell and a metal wearing insert having cast en agement with each other, one of said mem ers having an attaching lug and being of relatively annealable iron and the ot er of less annealable iron, the annealable member being annealed subsequently to the implacement of the insert therein.

11. A brake shoe comprising, in combination a malleable iron body or shell cast about a wearing insert, said insert being less annealed than said shell. 12. A brake shoe comprising, n combination, a malleable iron body or shell having a malleable attaching lug and cast. about a wearing insert. v r 13. A brake shoe comprising, in combination, a malleable iron body or shell cast about a wearing insert, 'sald insert being less malleabilizcd than said shell.

14. A brake shoe comprising, in comliinallmi. a malleable iron shell and a Wearing lllxlll hating east engagement with each other. the llltlllQlllJlU member being malleabil m-tl subsequently to the iin )laeement of the insert therein.

1."). is it new article of nninufaetnre, 2i nnzllvuble iron brake shoe containing an inert of metal relatively less malleable, the nmllezible iron portions being malleabilizecl r-ltl 50flllll1ll to the implacement of the insert therein.

16. A brake shoe eon1prising,in combination, :1 mulleiible body or shell and a wearing: insert (one of suid members being provitletl with an attaching lug), the malleable member being lllilllttlblllZOCl subseqlu-zntly to the huplueement of the insert therein.

17. A bruke shoe comprising, in eombinution, a malleable body or shell and a Wearing insert, the malleable member beinginalleabilized subsequently to the implacen'ieut of the insert therein.

18. As a new article of manufacture, it brake shoe comprising a cast malleable iron shell having an integral attaching lug, 11, and recessed portions, 16, in the back there of, and u Wearing insert, such shell being; malleabilized subsequently to the implacement of the insert therein.

In testimony whereof I have hereunto signed by name in the presence of the two subscribed Witnesses.

ALFRED L. STRlllfllER. \Vitnesses:

PAI' L CARPENTER, EVELYN C. NAYLOR.

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