US1328594A - Brake-shoe - Google Patents

Description

FITZ WILLIAM SARGENT.

BRAKE SHOE.

APIPLICATIONHLED JULY 8.1919.

Patented Jan. 26, 1920.

3 2 SHEETS-SHEET l.

FEE-

ATTORNEYS FITZ WILUAM SARGENT.

BRAKE SHOE.

APPLICATION FILED JULY 8.1919.

1,328,594, I Patented Jan. 20, 1920.

2 SHEETS-SHEET 2.

By 7 {a FITZ WILLIAM SARGENT,

BRAKE SHOE AND FOUNDRY COMPANY, OF

TION OF DELAWARE.

BRAKE-SHOE.

Specification of Letters Patent.

Patented Jan. 20, 1920.

Application filed July 8, 1919. Serial No. 309,345. i

To all whom it may concern:

Be it known that I, Frrz WILLIAM SAR- onxr, a citizen of the United States, and a resident of'Mahwah, in the county of Bergen and State of New Jersey, have made and invented certain new and useful Improvements in Brake-Shoes, of which the-following is a specification.

My. invention relates to brake shoes designed to be used with railway and similar vehicles, and particularly to brake shoes of the type or class wherein a body portion made from cast metal, or cast metal having other material embedded therein, is used in connection with a back made'of wrought -metal or mild steel, the purpose of the back being to hold the parts of the shoe together in case the same should be-broken into one or more pieces, as frequently happens vwhen the shoe is in use.

Heretofore in making brake shoes having a wrought metal or steel back the usual practice has been to support the back within the cavity of the mold into which the cast metal is poured to form the body portion of the shoe, whereupon and when the molten cast metal is poured into the mold cavity the wrought metal or steel back becomes embedded in the rear surface or back of the shoe. This practice, however, results in heating the back to a high temperature, and frequently in burning or otherwise injuring the same to sucbjan extent as to materially weaken it. Furthermore, in such cases stresses are produced within the body of the shoe as the samecools, due to the presence of the back therein; because the back is not heated to'as high a temperature, asthe molten metal poured into the mold, and the fact that the body portion contracts more rapidly than the back during the cooling of the shoe.

The cooling of the, body molten metal has become in a gripping action upon body portion continues to portion after the solid thus results contract, which I action sets up stresses within the body of the shoe tending to crack the body metal along a plane extending longitudinally of the shoe; it having been found in practice that shoes are requently split in the manor having overhanging side of the fact that relative to t the back as the' nor indicated, which were set up as the shoe cooled and contracted against the'unyielding side edges of the back when the shoe was cast.

It will be further a parent'that a wrought iron or steel back embedded in the rear face of a brake shoe as above pointed out cannot be removed therefrom and used again, and that when the shoe is worn out such portions of the body portion thereto,

k, have to be discarded as scrap material.

In order to avoid the objections above pointed out and as distinguished from the old method of construction referred to, m y invention consists of the Wrought iron or steel back portion which is made separate from the body portion, and is assembled therewith after the body portion has been formed; this result being secured by pronally extending groove dove-tailed in form, walls, along which groove the back may be driven in assembling the parts, the cross section of the back obviously corresponding with that of the groove in which it fits; the term dove-tail or undercut referring to a downwardly enlarging opening T v The steel back of my improved brake shoe in addition cooperates with the body p'oras to secure the d attaching or key lug and the shoe to gether and in their assembled condition;

the key lug being also made separate from the body of th e shoe, and the same being provided; with a base portion which fits in a transverse groove ,or recesses provided in the body ortion and is locked in place he body portion by the back as the same is assembled with the body portion of the Shoe to therebyhold all the parts thereof interlocked one with the other.

YVith the'objeot in view of avoiding the objections above noted, and providing a brake shoe wherein the back and attaching lug are formed separately from the body of the shoe and are interlocked one with the other when the shoe is assembled, my invention consists in the improved brake shoe illustrated in the due to theinternal stressses accompanying drawing and hereinafter described and claimed, and embedded to thereby produce a brake shoe in such variations and modifications thereof having amore effective braking action, betas willbe obvious to those skilled in the art ter wearing qualities, or which is otherwise to which my invention relates. better suited for the service for which it is In the drawing accompanying and designed.

forming a part of this specification, and The rear face of the body portion 10 is wherein the preferred embodiment of my provided with a longitudinally extending invention is illustrated: dove-tailed groove 11, the two ends of which Figure 1 is a view partly in side elevaare open and unobstructed, as shown in Figs.

10 tion and partly in section upon a plane ex- 1, 2 and 12; and the bottom wall of this tending longitudinally thereof of a brake groove is provided-with one or more recesses shoe made in accordance with my inven- 12 located adjacent the endsof the shoe, and tion; preferably with one or more recesses 13' 10- Fig. 2 is; a plan view showing my imcated at the central portion of the shoe.

15 proved brake. shoe, a portion of the key lug The reference numeral 14 designates a and a" portion of the back being broken back made from wrought iron, mild steel, or away to show features which would othersimilar material, and which back correwise be hidden; sponds in cross section with the cross sec- Fig. 3 is a view showing a section upon tion of the dove-tailedgroove 11 in which it 20 a" transverse plane indicated by the line is designed to fit. The end portions of this 3-3, Fig.1; 7 I back in the form thereof shown in Figs. 1, Fig. 4 is a view, showing a section taken 2, 4 and'5 are slitted, at 15, Fig. 5, and the I I upon a transverse plane indicated by the portion 16 of reduced width thus out free I line 4-4, Fig. 1, looking toward the right; is so shaped as to provide a hump or lug 17.

I 25, Fig. 5 'fs'a fragmentary view showing one This lug is commonly formed before. the

35 shoe;

' construction of back whereb the same may back. is assembled with the shoe, and the be secured against longitu inal movement free end 18 of the portion 16 then lies above relative to the body portion of the shoe, this the plane of the under side of the back. being the form of back used in the embodi- After the back has been driven into place 30 ment of my invention illustrated in Figs. inthe dove-tailed slot 11, however, the free 1, 2 and 4. ends 18 of the lugs at each end of the back Fig. 6 is a fragmentary view showin an are forced downward, as by a blow from a alternative method of securing the ack hammer, and made to enter the recesses 12 against movement longitudinally of the in the back of the body portion, thereby preventing longitudinal movement of the back Fig. 7 is a view showing a section upon a relative to the body portion of the shoe. longitudinally extending plane indicated by Other portions of'the back indicated by .the line 7-7, Fig. 6;. the reference numerals 19 are also prefer- Fig. 8 is a v'ew showing the end portion ablv out free from the same along. all; but

.40 of the back shown in Figs. 6 and 7 before one of their sides to therebyprovide fas- 05 the same is bent over to form a loop shown tening lugs or tongues which may be driven in said figures; downward and intothe recesses 13 in the Fig. 9 is a view partly in side elevation body of the shoe when the parts thereof are and, partly in section upon'a longitudinally assembled, to thereby more effectively pre- 45 extending plane of an embodiment of my invent the falling away of portions of the 50 Fig. 9.;

vention III which a key lug integral .with the body portion from they back should the ho dy body of the shoe is used; portion become broken when in use; It Fig. 10 is a view showing a section upon a will be appreciated, however, that these lasttransverse plane indicated by the line 10-10, mentioned lugs,-as well as the recesses with a which they cooperate, may be omitted Fi 11 is a view similarto' Fig. 9 but should it be deemed desirable to do so, as showing the key lug as made from a suitable the fastcnings provided by the end lugs 17 wrought metal blank bent so as to provide and the recesses 12 Wlll be adequate in a form of lug commonly referred to as of many services.

55 the box' type The lugs or humps 17 he in between the Fig. 12 1s a view showing the shoe shown toes or end supporting lugs of an ordinary in Fig. 11 in plan; and, standard type of brake head when the shoe Fig. 13 is a view showing a section upon a s in use, and prevent sidewise movement of transverse plane indicated by the line 13-13, the ends of the shoe; and end lugs 20 are 60 Fig. 11. provided at the ends of the body portion 1-25 Referring to the drawing, the refrence nufor taking up the thrust, due to the retardv meral 10 designates the bodyportion of my mg action of the brake shoes, which 18 improved brake shoe; the same being orditransmitted through the shoe to the brake narilv made from cast iron, or from cast head, when the brakes are applied, said 65 iron in which inserts of other material are lugs engaging with the end supporting lugs I able attaching or I t1on, after the back is in place vented.

head with which my improved brake shoe is designed tobe used; y lmproved brake shoe is secured to the brake head whereby it is supported by a suit key lug designated byv the reference numeral 21in Figs. 1, 2 and 3,. the form thereof there shown having longitudinal openings 22 to accommodate the ordinary key whereby the shoe is secured to a brake head. This attachin or key lug made separate from the-b0 y portion 10 of the shoe; and the same is ordinarily made from malleable iron, wrought metal, or of a metal which is tougher and stronger than the body portion of the shoe, in order to more eifectively resist'the strains to which the lug is subjectedwhen the shoe is in use. The lug 21 is providedwith a base portion 23 which fits withina transversely extending recess or groove 24 provided in the body portion 10, the groove and base being shown as dove-tailed in form in order to provide an interlocking connection between the key lug and the body portion of the shoe. The base 23 of the lug is shown as provided with a dove-tailed recess 25 of such a width and so arranged as to register with the longitudinally extending roove 11 provided for the back 14: when the lug is in place; from which it follows that when thekey lug is in the transverse groove 24 provlded for 1t, and the back 14 is driven longitudinally along the groove 1l within which it fits, the lug will be held in place relative to the body and all the parts of the shoe ihterlocked with one another; thereby providing an extremely strong'connection between the parts of the shoe, all of which are interlocked with one another and mutually secured together in the. assembled. shoe. 7 Figs. 6, 7 and 8 show a slightly modifiedscheme for preventing longitudinal movement of the back 14 after'it has been introh duced into the groove ll ception, as hereinbefore ziplained. In this form of my invention the end of the back is provided with an extending portion or tongue 26 of reduced width and which porrelative to the body portion of the shoe, is bent about a pin 27 extending through the end lugs 28 ofthe" bodyportion, thereby providing a loop through which the pin extends and whereby longitudinal movement of the back is preprovided for its re- In view of the-premises it will be appreciated that the wrought metal or mild steel back is an c'lement entirely separate from the body portion of the shoe, and is assembled therewith after the body portionhas been produced. It therefore follows that the back is not burned or otherwise injured during the casting operation; and I may here refound feasible in practice to form 'lILlJllB back by the use ofasimple core with such portion or portions are forced into recesses 13 formed in the middle portion mark that Iam enabled to use a back made from-much thinner metal than has heretofore'been possible, because of the fact that the same is in no way burned or injured by hot metal during-the casting operation. It will also. be appreciated that the cost of providing a steel back for the greatly reduced, as the complicated and expensive molding operation heretofore necessary to position a back in a it in place while the molten metal is poured thereinto,

is entirely avoided; it having been the groove sufficient accuracyto provide for tion'of the steel back subsequently driven thereinto, as a vclose and even bearin throughout the entire extent; of the back is unnecessary in practice. Furthermore, the fact that the metal ordinarily employed to form the back is quite thin permits the back be driven into place, even though there be some irregularity/along the side edges of the groove within which it fits.

the recep It will be obvious that when the body portion of the shoe has been worn to such an extent as to be no longer serviceable the lugs l7 may be bent up, and the back driven out of the groove within which'it lies with comparative ease; or of the body as may still be attached to the back by the side walls of the groove may-be broken away from the back; whereupon'both the back and the at taching lug may be used with a new body portion, as hereinbefore stated; it having been found feasible in practice to use a single lug and back with several successive body portions;

. In the embodiment of my invention illustrated in Figs. 9 and 10 the steel or wroughtiron back 141s made separate fromthe cast metal body portion 10 bling the parts, the same as hereinbefore explained; after which the tongues or lugs 19 groove within which the back lies to thereby prevent movement of the back along the groove. The attaching or key lug 29, however, is'integral with the body of the shoe, as best shown in Fig. lug is reinforcedand in part formed by a bar bent to provide a top portion 30, dependingsides 31, and hooks or toes 32, all except of the top bar SO-being 1n the cast metal from which the body of the-shoe isformed. The sides of illlllfi Isteel backl4 overlie the toes 32 when t e 10, thereby greatly strengthening the lug and preventing the wrought-iron or steel bar embedded in and forn'ung a part thereof from pulling out from the body portion, and

embedded body portion ismold, and to hold the botor the loops 28 opened, 7

10; and the said ack is in'place, as best shown in Fig. 1

i the center lugs of the lug as a Whole from being broken oif from the body of the shoe.

Figs. 11,12 and 13 show aform of my invention wherein a hollow lug of box-like form, and of a class or type commonly referred'to as box lugs, is employed for supporting the shoe in a brake head. The lug shown is made from a suitable wrought iron or steel blank of general cross-shape form and having portions which when bent downward form the end plates 33 of the lug, which plates provide extended bearings for the shoe is supported; together with other portions shown as bent downward to provide 't-he sides 34 whereb the lag is attached to. the body 10 of the s oe, andinward to form hooks or toes 35 which These base portions or lugs lie within transversely extending grooves or recesses 36 which, while shown as'separated one from the other, may obviously take the form of a single recess or groove within which the parts 35which form the base of the key'lug lie when the lug and body portion are assembled. The steel back 14in this form of my invention overlies the lugs or toes 35 of the key lug when the parts of the shoe are assembled, and serves to fasten the same to the body of the shoe; the said back fitting in a dove-tailed. roove 11, andvthe same being. prevented ment therein by lugs 19 depressed into re-. cesses 13 provided in the bottom wall of the groove, as will be understood. The end walls 33- are provided with holes 37 through which the key which fastens the shoe to the brake head extends and, while the back is shown in Figs. 9, 11 and 12 as unprovided with guide lugs such as are provided by the humps 17 and the tongues 26 in the forms of my invention illustrated in Figs. 1 to 8, it will be appreciated that such or other forms of guide lugs for preventing sidewise movement of the ends ofthe shoe will be provided, should theirv presence be deemed necessary or desirable, and'that such lugs are in fact commonly present in most forms of brake shoes in use upon railway vehicles.

' Havingthus invention, I claim Letters Patent: a

1. A brake-shoe comprising a body porlongitudinallyextendrear face thereof and a back fitting within formed in; said described and explained my and desire to secure by ing groove on the a plurality of pockets; said groove, and i"meansback and pockets to in their said 2. In a bra e shoe,a body portion having a. longitudinally extending dove-tailed or "undercut groove of uniform width throughthereby retain the shoe and back 1positions.

the brake-head whereby Y sembling the parts;

in effect constitute. the base of the lug regarded in its entirety.

gtudinal movement thereof rom longitudinal moveend lugs spaced apart a longitudinally extending to provide a loop;

through said loop;

adapted to be forced into said out; a back corresponding in width with the width of said groove and so shaped as to move longitudinally thereof in assembling the parts; means for locking said back against movement longitudinally of said body portion; and an attaching lug whereby the'shoe may be secured to a suitable brake head.

3. In a brake shoe, a. body portion having a longitudinally extendingdove-tailed or undercut groove of uniform width throughout; "a back corresponding in width with thewidth of said groove and so shaped as to move longitudinally thereof in -=asmeans carried by said back. and adapted to engage saidbody portion for locking the same against movement longitudinally of said body portion; and an attaching lug whereby the shoe may be secured to a suitable brake head.

- 4. In a brake shoe, a body portion having a longitudinally extending dove-tailed or undercut groove .of uniform width throughout; a back corresponding in width, with the width of said groove and so shaped as to move longitudinally thereof in as-' sembling the parts, and whichback is provided with a portion adapted to be bent and made to engage the body portion to thereby lock the back in place and prevent longiwithin said. groove; and an attaching lug whereby the shoe may be secured to a suitable brake head.

5. In a brake shoe, a body portion having a longitudinally extending dotve-tailed or undercut groove; a back corresponding in width with the width of said groove and so shaped as to move longitudinally thereof in. assembling the parts, and a portion of which back is out free therefrom to thereby provide a tongue; a recess formed in the bottom wall of said groove adjacentsaid tongue and into which the same may depressed; and an attaching lug whereby {the shoe may be secured to a suitable brake .head.

' 6. In a'brake shoe, a bodyp'ortion'having from one another and dove-tailed or undercut groove extending. between said lugs; a back corresponding in width with the width of said roove and so shaped as to move longitudina 1y thereof in assembling the parts and the end of which back is bent a pin extending through in said end lugs and and an attaching lug be secured to'a suitaopenings provided wherebv the shoe may b'le brake head..

. 7 In a brake shoe, a body portion having end lugs spaced apart from one another, and alongitudlnally extending dove-tailed or undercut groove extending between said lugs; a back corresponding in width with the widthof said groove and so shaped as to assesses move longitudinally thereof in assembling t e ports, and the end of which back is provided with on extending portion of reduced width and which portion is bent to provide it loop; u. pin extending provided in [said endings and through said loop; end an attaching lug whereby the shoe may be secured to a suitable brulte head.

8. in o broke shoe at body portion having alongitudinelly extending dove-tailed or. undercut groove; a centrally located key lug termed separately from said body portion and whereby the brake shoe may be secured to 2. suitable brake head; and: a hock-corresponding in width with the width of said groove and inslly stereo in assembling the parts, and which hock engages with said securin lug when the ports are assembled to thereby lock said lug and body portion together. 9 I in a, brake shoe, ohody portion having it longitudinally extending dove-tailed or undercut groove, and a transversely extend ting groove located adjacent the central por- 331011 of the shoe; a securing lug formed sepsrote T from solid bod portion and having a, base portion lying within said transverse groove; and a heck correspondin in width with the width of said longituinally extending groove and so shaped as to move longitudinally thereof in assembling the ports, the arrangement of the parts being such the hack engages with the said securing lug to therehy lock the parts of the assembled shoe together.

10., In it broke shoe, a body portion having s longitudinally extending dove-tailed or undercut groove, and a centrally located adopted to within engages with the base portion transversely extending dove-toiled or undercut groove interesting sol-d first-mentioned groove; o key lug formed separately from said body portion and having a, base the transverse groove aforesaid; end a. back corresponding in Width with the width of said roove and so shaped as to move longitudinally thereof in ossernblin the parts, the relative arrange inent of ti e parts being such that the hack of the key lug to thereby lock the parts together in the assembled shoe.

11. In a brskeshce, a. body portion havinga longitudinally extendin dove-tailed or undercut groove, and a cen 'ally located transversely extending dovetailed or undercut groove intersecting said first-mentioned groove; a key lug formed separately from said body portion and having a base ads ted to fit witoin the transverse groove a; oresaid, and a dove-tailed or undercut recess through openings so shaped as to move longitu-' portion of the brake head; with the width of said as to move longitudinally thereof in assemblin the ports, and a adopted to register with the dove-tailed or undercut groove in said body portion when the lug is in place; and a back corresponding in Width with the width of said groove and so shaped as to move longitudinally thereof in osseni. ling the ports the relative arrangement of the parts being such that the backlies within the dove-toiled or undercut recess in the base portion of the key lug when the pelts are assembled to thereby lock the parts together in the assembled s oe.

12. In a. brake shoe, a body portion hoving s longitudinally extending dove-tailed or undercut groove, and transversely extending recesses located adjacent the central shoe and beneath the bottom Wall of said groove; :1 securing lug termed separately from-saidbody portion and having bottom or base portions lying within said recesses; and aback corresponding in width with thewidth of said longitudinally extending groove'and so shaped as to move longitudinally thereof in assembling the parts, and which heel: overlies the portions of said securing lug which lie within said recesses when the pertsof the shoe are assembled.

l3. ln a brake shoe, a body portion having a longitudinally extending dove-toiled or undercut groove; e. lzey lug formed sepsratelyifrom said body portion and whereby the brake shoe may be secured to at suitable brake head; and t back corresponding in Width With the wi th of said groove and so shaped as to move longitudinally thereof in assembling the parts, and a portion of which back engages with a portion of the lug storesaid to thereby fasten the lug to the shoe when the ports are assembled.

let. in it broke shoe, s body portion having a longitudinallyeiitending dove-toiled or undercut groove; s key lug formed separately from said body portion and whereby the brake shoe may be secured to a suitable a. back corresponding in width groove and so shaped portion of which back over 1es a1 portion of the lug aforesaid to thereby fasten the lug to the shoe when the parts are assembled.

Signed at New York, borough of Manhattan, in the .county'of New York and State of New York, this 2nd day of July A. D.

FITZ WILLIAM SARGEN T. Witnesses;

E. B. SIBBALD, WALLACE B. SUTHERLAND.

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