US911393A - Brake-shoe. - Google Patents

Description

-' W. 'B. GOODWIN.

BRAKE SHOE. APPLIOATION'IILED 1130.30. 1907.

Patented Feb. 2, 1909.

2 SHEETS-SHEET l.

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W. B. GOODWIN.

BRAKE SHOE.

APPLICATION TILED DBO. so. 1907.

Patented Feb. 2, 1909.

2 SHEETS-SHEET 2.

mZziam B. Goodwin, 11mm THE NORRIS I'l'rtns col, WASHINGTON. D. c.

WILLIAM BEGOODWIN, OFGO LUMBUS, OHIO.

- BRAKE-SHOE.

Specification of Letters Patent. Application filed December 30, 1907. Serial No. 408,464.

Patented. Feb. 2, 1909.

To all whom it may concern:

Be it known that I, WILLIAM B. Goon- WIN, a citizen ofthe United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Brake- Shoes, of which the following is a specification.

My invention relates-to improvements in brake shoes of that class having a back portion or portions separable from the member with which the filling is in contact, whereby the filling material may be worn away in the use of the shoe, leaving the back member intact and ready for application to a new supply of the frictional material.

It further consists in the provision of a plurality of back members and the dispensing with a shell proper or receptacle for the frictional material; but in the case where desired, a narrow depending flange may be formed on one of the back members to lie adjacent to the frictional material, and to operate as a support therefor. It is primarily intended however, that the frictional material should not be inclosed or surrounded by a metallic casing or shell, or shell formed from any other material, the shoe preferably consisting of the frictional material and the back portions to which said material is to be attached.

It further consists in the provision of means for securing the frictional material to the back portions and for-securing the back portions together and forsecuring the completed brake shoe to a brake hanger.

It further consists in the provision of means for admitting the air to the frictional material, on itsinner and outer faces and also through the body thereof, and to the wheelface. V 7

With these features in mind and others and combinations thereof which will hereafter be set forth inthe desoriptionand included in the claims,I refer to the accompanying drawings which are hereto attached and hereby made a part of this specification, in Which I I Figure 1 is aside view ofmy improved brake shoe, partly in vertical longitudinal section; Fig. 2' shows the outer back portion, Fig. 8 shows a. second back portion to which that shown in, Fig. 2 is fitted, Fig. 4: shows the binding or spring strip adapted to secure the frictional material tothe back portions, Fig. 5 is a perspective'of one of the blocks of the frictional material; Fig. 6

is a block having two fastening extensions thereon and Fig. 7 shows the spring strip folded back at its ends over the extensions through which it is inserted; Fig. 8 is a ton view of a modified binding strip or tie; Fig. 9 is a side view of the tie shown in Fig. 8.

In the drawings in which the same-numeral indicates the samepart throughout, 1 indicates a block or section of the frictional material having its edges cut away to form an octagonal member as shown at 2, 3, 4, and 5.

Referring to Fig. 1, it is seen that when the sections or blocks of frictional material are positioned properly for use, a triangular depression exists between the sections or blocks on their inner and outer sides, such depressions being shown at 6 on the outer surface and at 7 on the inner surface. The number of blocks or sections of the filling material may be as great as desired under the circumstances, and each block is preferably formed with an octagonal cross section whereby the depression noted is left between contiguous blocks on the oppositely disposed faces. When the brake shoe is applied to the surface of the wheel, the air may rush through thistriangular depression over the face of the wheel, thereby tending to cool the same. If preferred the block may be formed of some other shape and the depression formed there between is not essentially triangular, it being necessary only to leave depressions between the blocks for the free admission of air, the form of the de pression' or the number of sides of the block being variable.

Referring to Figs. 1 and 5 a depression 8 is noted in each side of each section, and when the sections or blocks are laid together in position for use the depression in each block opens into the depression in the contiguous block, thereby forming a hole through from the upper to the lower sides thereof, said hole or opening communicating above with the depression 7 formed on the inner face of the brake shoe and below with a depression 6 formed on the outer face of the brake shoe. Thereby is provided means for the circulation of air through the depression 7 on the inner face of the brake shoe blocks or sections 21, downwardly through the opening 8, into the depression 6 formed on the outer face of the brake shoe block on to the surface of the wheel and thence outwardly over the surface thereof.- Each block or section 1 formed with an extension 9 thereon, said extension being provided with the opening 10 therethrough, for a purpose to be hereinafter described.

.11 is a back portion or member, reinforced at its ends as appears at 12 and 13, and having a lug formed at each end thereof shown at 1 1- and 15, and providedwith openings therethrough shown at 16, said openings being as numerous as the extensions on the block or section of the frictional material. A second back member or portion is shown at 17, having openings 18 therethrough adapted to register with the openings 16, and provided adjacent its ends with the depressions or cutouts, shown at 19 and 20, said cutouts being adapted to receive the lugs 14: and 15 formed on the back portion 11. The sides 21 and 22 of a cutout 19 embrace the lugs 14; on their outer sides, and assure the proper positioning of the said member l'i'. The hook or attachment for connection with the brake hanger is shown at- 23. The back portions being positioned together with the openings therethrough registering, the blocks of the frictional material are placed with their extensions 9 protrudingthrough the registering openings, sufficiently to place the openings 10 'therethrough above the outer face of the back portions; a metallic strip 24 shown in Fig. 4: is adapted to be now inserted through said openings 10, its ends when positioned lying adjacent to the lugs 14 and 15; this strip 2% is preferably formed of spring steel and given a degree of curvature sutlicient to cause it, when positioned, to draw the blocks or sections of frictional material 1 into snu engagement with the back portion 11.

My improved brake shoe has the advan tage of being made up of parts easily separable, the back portions being light in weight, but yet of sufficient strength to stand the usage to which they are subjected, and are readily constructed; no complete inclosing receptacle or shell for the frictional material is contemplated, and thereby the costof manufacture is reduced, and at the same time the weight is reduced. It has the further advantage of rendering it possible to remove a block or section of the frictional material without disturbing or removing other blocks forming the brake shoe, and a substitute block may be positioned likewise without its being necessary to remove all of the remaining blocks; further, when the frictional material is deeply worn, it may all be removed, the back portions remaining intact and ready for continued use. The

frictional material is formed of acomposition, one cast as desired, but in either case the cost of renewing the frictional material is the entire expense necessary to keep the shoe in working order after it has been put into use. There is a great demand for a brake shoe havingas low an initial. cost as is consistent with material and workmanship equal to the requirements of usage, which brake shoe may aftervards be replaced in part if necessary without discarding the en tire shoe; and 1 provide a shoe in which the back portions may be used repeatedly inasmuch as they are not subject to frictional wear, and the only expense of renewing is that of replacing the frictional material. Further, i provide a system of ventilation whereby air may be directed upon the surface of the wheel heated by friction, and also upon and through the blocks of Jlrictional material themselves, whereby the ctlccts of the heat incident to braking are very materially reduced.

In big. (3, i have shown a modified form of construction of the extension or securing lug on the blocks or sections 1, a. corresponding change 111 the number of openings through the back portions being rendered necessary thereby; this nmdiiication consists in the provision of two extensions 25 and on each block, and an opening 27 through each for the reception of a strip of spring steel for holding the same in place. l also contemplate, instead of having the ends of the strip of spring steel abut against the reinforcing construction 13 between the lugs 14- and 1.3, to fold the ends of said strip upwardly and backwardly to embrace the extension 9 formed on the cud block, thcrcby more securely positioning said strip; this construction is shown in lag. T. A single binding or tie strip for each cx-- tension 9 on a block or section 1 may be used, and such tie I have shown in Fig. 8 in which 28 is the body of the tic, and 2S) and are flanges formed on the ends thereof, the body tapering appropriately adjacent its ends. In positioning the tie -2S the extensions are bent upwardly as shown in dotted lines in Fig. 9 and the extensions when thus turned up are no higher than the greatest thickness of the body \Vith the extensions thus bent upwardly, the tie may be inserted through the opening 10 (see Fig. 5), and after being positioned appropriately therein, the extensions are adapted to be bent outwardly to engage the face of extension 9, to prevent the accidental removal of the tie.

lVith the individaul tie shown in Fig. 8, any block 1 may be positioned and removed independently of the others, whereas in the use of the tie 2%, the latter must be disein gaged s veral blocks when it. is desired to remove a block near the middle of the shoe. hat I claim is: 1. A brake shoe formed of a plurality of blocks or sections of frictional material, ventilating means in connection with said blocks, a. plurality of back portions to which said blocks are adapted to be secured, and means for securing the same thereto.

2. A brake shoe comprising a plurality of blocks or sections of frictional material, a plurality of back portions adapted tobe fitted thereto, means on said blocks for engaging said back portions, and means for engaging said means whereby said blocks are securely positioned against said back portions.

3. A brake shoe comprising a plurality of blocks or sections of frictional material, a back memberadapted to be fitted to said blocks, a reinforcing back member adapted to be mounted upon said'first mentioned back member and fitted to said blocks, and a third member adapted to engage said blocks and said back members to bind the same securely together.

4. A brake shoe comprising a plurality of blocks or sections of frictionalmaterial, a back member adapted to be fitted upon the outer face of said blocks, a reinforcing back member mounted upon said first mentioned back member and adapted to engage said blocks, and a securing member adapted to engage said reinforcing back member and said blocks whereby said blocks are securely held in engagement with said first mentioned back member.

5. A brake shoe comprising a plurality of blocks or sections of frictional material having depressions formed on the frictional face thereof for the circulation of air therethrough, and similar depressions formed on the opposite faces thereof for the circulation of air therethrough, whereby said blocks and also the frictional surface of the wheel against which said blocks operate are cooled, and means for maintaining said blocks in operating position. i

6. A brake shoe comprising a plurality of blocks or sections of frictional material having transverse depressions formed on the frictional face thereof on the opposite face thereof, and having openings formed therethrough communicating with the said depressions on the opposite faces of said blocks, whereby air is admitted into contact with the said blocks and with the surface of the wheel operated upon for cooling the same, and means for maintaining said blocks in operative position.

7. A brake shoecomprising a plurality of blocks or sections of frictional material having transverse depressions formed on the frictional face thereof and on the opposite face thereof, and having openings formed therethrough communicating with the said depressions on the opposite faces of said blocks, whereby air is admitted into contact with the said blocks and with the surface of the wheel operated upon for cooling the same, and a back portion mounted upon said blocks, a reinforcing back portion mounted upon said first mentioned back portion and a securingmember adapted to secure said blocks and said back portions firmly together.

8. A brake shoe comprising a plurality of blocks or sections of frictional material having transverse depressions formed on the frictional face thereof and on the oppo site face thereof, and having openings formed therethrough communicating with the said depressions on the opposite faces of said blocks, whereby air is admitted into contact with said blocks and with the surface of the Wheel operated upon for cooling the same, extensions formed on said blocks having openings therethrough, a back mem her having openings through which said extensions are adapted to protrude, a reinforcing back member mounted upon said first mentioned back member and having openings adapted to register with the openings in said first mentioned back member and to receive said extensions therethrough, and a securing member adapted to be inserted through'said openings in said extensions on said blocks and to engage said reinforcing back member, whereby said back members and blocks are firmly bound together.

9. A brake shoe comprising frictional material, a plurality of back members to which said frictional material is adapted to be secured, and means for admitting air to said frictional material and to the heated wheel surface to cool the same.

10. A brake shoe comprising frictional material, a plurality of back members with which said frictional material is in engagement, means for securing said frictional material to said back members, and means provided in connection with said frictional material whereby air is admitted thereto and to the heated wheel surface to cool the same.

11. A brake shoe comprising frictional material, means for securing the same in operative position, said frictional material havingdepressions formed on the braking surface thereof whereby air may be admitted thereto and to the heated wheel surface,

similar depressions formed on the face thereof opposite to said braking surface, and openings therethrough communicating at their ends with said depressions, whereby air is admitted through said frictional material to cool the same and the heated wheel surface.

In testimonywhereof I aifix my signature in the presence of two witnesses.

WILLIAM B. GOODWIN.

lVitnesses v Horace S. KERR, GEO. \V. RIGHTMIRE.

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