US1308402A - Brake-shoe - Google Patents

Description

F. T. VD'lCKlnlSQrvl.

BRAKssHoE.

APPLICATION FILED FEB. 15. 1909- RENEWED FEB. 10.191?.

1,308,402. Patented July 1, 1919. I zsnEeTs-SHEET 1.

.WITNESSES THE COLUMBIA PLANUQRAPM C0.. WASHINGTON, D. c.

F. T. DICKINSON. BRAKE SHOE.'

APPLICATION FILED FEB. I5, I909. RENEWED FEB. 10,1917.

I ,$08,402. Patented July 1, 1919.

Z SHEETS-SHEET 2.

UNTTED sTATEs VPATENT onmoit. N

FRANK T. DICKINSON, OF TOLEDO, OI-IO.

y BRAKE-SHOE.

To all whom t may concern.'

Be it known that I, FRANK T. DIoKINsoN, a `citizen of the` United States, residing at Toledo, in the county of Lucas and State of Ohio, have invented certain new and useful Improvements in Brake-Shoes, of which the following is a specification. y

This invention relates to `brake shoes and particularly those types of brake shoes `or wearing blocks .which areused `on the brakes of railway cars and locomotives, and especially to such types of those brake shoes `as are provided with steel reinforcing backs and inserts cast into the wearing face of the shoe at the time it is poured. The principalobjects of the present invention are the provisionof akey lug of improved form for attaching the shoe to the brakehead; the provision of an integral lug which may notbe detached from the body of the shoe or the reinforcing members without destruction of the continuity of the lug or the parts with which it has engagement, to the end that the shoe maynot become disengaged from the head and thereby cause derailment of the car to which it is applied; the `provision ofan attaching lug which will be rigid and resist bothlongitudinal and transverse stressesl received in shipping and in service, and which has means for guidingthe passage of the brake shoe key therethrough, and the provision lof a filler block which will prevent the flow of the metal of the body of theshoe up into the lug` at the time of casting, all so arranged that ashoe embodying my invention may be manufactured more inexpensively than in other ways at` present known to me, and may beV applied tof a brake head with greater facilityand accuracy and `wlth less danger of canting or other misplacement which causes the shoe to wear nnevenly, break prematurely and hence be `uneconomical and ineiiicient in operation; the provision of improved forms of inserts which may be either harder or softer than the metal of `thecast body of the shoe, or alternately both, whereby both fthe `frictional and the wearing qualities of theshoe may be regulated with nicety andl shoes of any degree of hardness produced with accuracy `by varying thequality or number of inserts applied to the wearing face thereof` i The above together with such otherobjects as will hereinafter appearand further Specification of Letters Patent. i i Patmtgd July 1, 1919. Application led February 1.5, 1909, Serial No. 477,859.` IRenewed February 10, 1917.

ofthe inserts appearing in Figs. 1` and 2.

Fig. 4 is a transverse section of the shoe illustrated in Figs. 1 and 2. 1 y Fig. 5 is a perspective view of the attachingl'lug shownlinsection in Fig. 1.

Fig. 6 is a perspective view of the filler block used for reinforcing the lug of Fig.

5, and of Figs?, 8, 9, 10 and 12, which figsenai no. 147,930.

ures illustrate modifications in the form of H the lug shown in Fig. 5.

Fig. 11 is a.` plan view of a stamping from which the lug of Fig. 12 is formed.

Referring to Figs. 1 to a it will be observed that in carrying out my invention I provide `the-usual castfbody portion or wearing face 14 and for the purpose of reinforcing the' shoe, I provide the body portion thereof at the back with one or more strengthening `members such for example as the flat straps`15,`16 and 17, which I preferably provide with rounded edges 18 and 19 in order to insure a firmer engagement with the body of the shoe, which straps are here shown as provided with end portions of greater breadth than the intermediate portions thereof in order that no part ofthe body `ofthe shoe maybecome disengaged fromsuch'straps in the event of the breakage` ofsuch body.` The widening of the ends of ithestraps may be accomplished by slitting asindicated at 20 and 21 and spreading `the opposite portions 22 and 23, and 24 and 25, or in other ways which will readilyoccurto those who are skilled in the art;

p In order to produce a shoeof maximum longevity` and atthe sametimeone which is of the highest frictionalpowers, I have provided the arrangement of inserts illustrated in Figs. 1 to t in preferred form, wherein I make use of steel, wroughtiron,

"or other hard metal blocks 26 in order to retard the wearing away of the frictional face of the shoe, and for wheel dressing and other well known purposes, and alternately therebetween blocks of gray iron, Cast metal, or other comparatively soft substances of a highly frictional nature.

In practice I nd it most convenient in the manufacture of my improved shoes to place in one half of the mold in which the shoes are to be cast a chill block 29, upon which I place the blocks 26 and 27 mounted alternately upon a doubled wire 30, (see Fig. 3), which may then be twisted by the pin 31 until the blocks assume the position indicated most clearly, in Fig. 1.

It will be observed further from Fig. 3 that the'several elements of one of the series of blocks 26 and 27, preferably the cast blocks 27, are provided with projections such as illustrated at 82, 33, 84 and 35, which I have found useful to make of substantially the same width as the block, in order to space the several members of the two Series a sufficient distance from eachother for the purpose to be now described.

This procedure. and arrangement of parts serves a two fold purpose, viz., as the cast metal of the body of the shoe 14 iiows between the several blocks 26 and 27, as indicated at 28, it comes into contact with the chill block 29 and is hardened to a degree intermediate between that of the frictional blocks 26 and Athe dressing blocksv27, and at the same time all of the blocks 26 and 27 are tied together in the cast metal 28 by the wire 30.

It will thus be seen that not only will it be impossible for any of the inserts 26 and 27 to become disengaged from the body of the shoe and drop out of it, but also that there is no sharp line of demarcation between the hard and soft portions of the wearing face, as the intermediate portions 28 tend to blend one into the other gradually, and scoring of the tread of the wheel to which the shoe is applied is thereby avoided.

By reference to Figs. 2 and 4, it will be noted that my improved forms of inserts and means for fixing them in the cast metal ofthe shoe is equally adaptable to the flange typev of shoe as to the plain or ball types, 36 being the harder inserts and 37 the softer inserts, which are brought into position by a wire as illustrated in Fig. 3, upon a chill block 39, for the purposes above described.

In Fig. 5, I have shown a perspective view of the attaching lug illustrated at 40 in Fig. 1, and in Fig. 6 a like view of the filler block 41, which I use for the purpose of reinforcing and stiffening the lug 40 and to avoid the necessity of using cores for preventing the cast metal of the body of the shoe from entering and filling the lug at the time of pouring the-shoe.

It will be apparent that by virtue of the provision of the said filler block 41, and of the depressed portion 42 of the top of the said lug 40 not only is the brake shoe key more readily passed through the key-way in such lug, but it also finds a much firmer seat therein.

In Fig. 7 I have illustrated a modified form of lug which may be used in shoes where rods are found desirable in place of straps, or where no reinforcement at all is used but reliance is placed upon the pas sage of the cast metal of the body of the shoe through the apertures 48, 44 and 45 instead of the straps 16 and 17 through apertures such as 46 and 47. This type of lug may be cut away or dovetailed as indicated at 48, 49 and 50, in order to give further en gagement with the cast metal of the body of the shoe, although it is obvious that the reinforcing filler blocks 41 may also be utilized if desirable.

In Figs. 8, 9 and 10 I have illustrated further modiiications in the form of the depressed portions 42, and in Fig. 11 a blank from which the lug of Fig. 12 may be formed without euttingaway the blank as indicated at 51 and 52 in Fig. 5 or as indicated in the structures illustrated in Figs. 7 to 10.

It will be apparent to those who are skilled in the art that other modifications of my inventions may be designed for the purposes above set forth.

Having thus described my invention and illustrated its uses, what I claim as new and desire to secure by Letters Patent is the following:

1. In combination with a hanger and its connectiiw key, a brake shoe having a stiffening back, a body of cast metal and a separate attaching lug fixed in said body and of box-like form, and a reinforce for said lug.

2. In combination with a brake shoe comprising a wearing face and a reinforcing back embodied therein, a separate attaching 110 lug of box like form engaging said wearing face and back.

3. In a brake shoe, a unitary wrought metal attaching lug, comprising top, side and end portions, said side and end portions 115 being separate but approximately contiguous, and said top portion being provided with a depressed bearing surface for the attaching key, substantially as described.

., 4. In a brake shoe, an attaching lug hav- 120 ing top, sides and ends, a key-way through said sides for receiving the brake shoe key and a depression in sai top for guiding the key through the key-way.

5. In a brake shoe, in combination, a body 125 portion, an attaching lug fixed in said body and a solid reinforcing filler block in said attaching lug.

6. In a brake shoe, in combination with a body portion, an attaching lug fixed in said 130 body and having a key-Way and a reinforcing filler in said attaching lug between said key-way and body portion. i

7. In a brake shoe, in combination, a bod portion, a wrought metal attaching lug of box like form and a solid filler block for reinforcing said lug.`

8. In a brake shoe, a body portion, a separate attaching lug fixed in said body portion, a at strap passed through said lug and a filler block for reinforcing and stii'- ening said lug. v

9. In a brake shoe, a body portion, a separate attaching lug fixed in said body portion, a flat strap passed through said lug and a filler block for reinforcin and stiening said lug, the top portion o said lug being depressed.`

l0. In combination with a hanger and its connecting key, a brake shoe having a lug of sheet metal fixed to the back of said shoe for supporting said shoe through said key and having its top depressed thereby formfor supporting said shoe through said keyl and having its top depressed and flattened thereby forming an inwardly extending earing thereon adapted to bear upon said In testimony whereof I have hereunto signed my name in the presence of the subscribed witnesses.

FRANK T. DICKINSON.

Witnesses:

PAUL CARPENTER, Gmo. C.` DAvIsoN.

Uopies of this patent may be obtained for vefcents each, by addressing" the Commissioner of Patents.

Washington, D. G. n

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