US1462967A - Brake shoe - Google Patents

Description

July 24, 1923.

H. JONES BRAKE SHOE Filed May e, 1929 Patented July 2li, i923.

istanti earner essi-cit. Y

.Hanny Jones, or surrnnn, new Yoan, nssrsnoa To THE .enmarcan BRAKE i SHOE FOUNDRY COlfIPANY, OF VJ'Lll/IINGTON, DELAWARE, CORPORATION 0F DELAWARE.

Bniiirn snor..

Application led May 6,

To all 107mm t may concern.'

Be it known that l, Hanni* Jones, a citi- Zen of the'Unite-d States, residing at Suffern, in the county oii Rockland and State of New York, have invented certain new and useful improvements in Brake Shoes, oi which the following is a specification.

It has been customary 'for some years to embed metal insert sections or blocks in the cast iron body of brake shoes to prolong the lile oit the shoe. These insert sections have been made wedge shape in some form to secure anchorage in the body of the shoe. A s a result,the area of the insert sections on the wearing face of the shoe is at the minimum when the shoe' is new and gi adnally increases as the shoe wears down in servi-ce, while the area of' the body metal on the wearing face of the shoe is at the maximum when the shoe is new and gradually decreases with the wear of the shoe. Thus the strength of the shoe decreases as it wears because of the decrease in area oi' the anchoring body metall and the increase in area oi the anchored insert sections.

One oi the objects of my present invention is to overcome this detect in the manufac ture of brake shoes and to provide a shoe in which there is a comparative increase in the volume of body metal relative to the volume of the insert sections as the shoe wears, and thereby produce a shoe in which the body increases in strength insteadci'3 decreasing in strength as the shoe wears.

lVhen the wedge shaped insert sections are embedded in the body with their smaller faces exposed in the wearing face oi the shoe, according` to previous'practicepeach insert section transmits the brake pressure applied to the face of the shoe against that part or the body only which is immediately back of the insert section. And as the insert section is wider at the haclr than at the front and the body portions between the sections are narrower at the back than at the front, a fracture usually occursin the body at an inner side edge ot' an insert section.

Another object of my invention is to correct this detect in brake shoe.construction by providing insert sections of novel shape and arranging them in the body so that they will distribute brake pressure over a greater area of the body and avoid weakening the shoe in the manner described.

have shown my invention in a selected pose oit anchoring 1920. Serial 150.379,199.

torni in two kinds of shoes in the accompanydrawings and reier theretogw Fig. l is a side elevatP n,y partly insection, e'l acar shoe embodyin the'invention;

Fig. 2 a vsectional view on the line 2 2 of Fig. l;

Fig. 3 is side elevation, partly in section,

of one type of driver-slice embodying theinvention g Fin'. 1l is of Fig. 3.

In the drawings, ldesignates the sections or bloclrs which are cast onor otherwise se-` cure-:l to a plurality of strips 6 of reticulated metal to 'form a complete insertupon which tl e body 7 is cast. The insert sections are preferably fiade ot ductile metal butthey may be made of any metal or composition suitable for the purpose,`and they may be aged in any suitable manner with the a sectional view on the line i--et' stri ps :fio that theyL will be held in place by the strips in the body. lv prefer to usel strips made or expanded metal, as shown, but l reserve the right to use wire strips or any other lrind et strips which will serve the purthe blocks or sections in the body. y

The insert section is of novel shape in the brake shoe art,l being tapered inwardly and having its larger tace 8 exposed in the wearing face of the shoe and its smallerV iace 9 embedded in the body.v The sides l0 of they section incline fromy the outer face 8 inwardly and merge into the edgesof the rounded inner face 9 so that in cross-section the block or insert is substantially domeshaped in appearance. y v l The advantages of myinvention will be readily appreciated by those skilled in the art. The maximum area of the insert sections is exposed in the wearing` face of the shoe and is brought into contact with the, wheel when the shoe is new, and at this time the body is of maximum strength. My inthe sides ofthe sections. bution ofbralre pressure around the two sides andfbaclrl or the sections and the tapering shape of the sections and the absence of sharp edges on the embedded 'face and sides of the sections avoids the tendency or' the body to 'fracture which is incident to the use of wedge shaped blocks or sections tapering outwardly. lis the shoe decreases .in cross section by wear the body increases in voluine as compared with the insert sections and this means a comparative increase Vof strength for the shoe7 the importance of which'is apparent.

l hare iound'in practice that a brake shoe embodying` my invention has greater strength throughout its lii'e and is less likely to Jiracture than 'shoes made with Awedge shaped blocks or ysections taperherein described, and l reservo the right to make any changes in the construction and arrangement of parts, and the inaterials of This wide distril which the parts are made, as all'within the and spaced apart longitudinally of they body, and each oiE said inserts being substantially dome-shaped in cross section and having a rounded inner face merging` into sides which diverge to the outer tacel 2. brake shoe compri Y plurality of elongated insert blocks or sections embedded transversely in the body and spaced apart longitudinally of the body, said inserts being` substantially dome-shaped in cross section, and means embedded in said inserts and said body for .holdingv the blocks or sections in the body. Y

3. brake shoe comprising a body having a plurality of elongated insert blocks or sec. tions embedded transversely 1n thebody and n spaced apartlongitudinally oit the body, said inserts beingsubstantially deine-shaped in cross section, and a plurality of reticulated metal strips embedded in said blocks or sections and in said body on edge to the wearing lace of the shoe forholding the blocks or` sections in the bodyf HARRY JONES;

tted to extend transverselybt' the lbody sing a body having;Y

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