US1847667A - Brake shoe - Google Patents

Description

R. B. POGUE BRAKE SHOE Filed March 18. 1929 March 1, 1932.

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.ll l.|!\ll lll Li wmww hbllhwrp- Patented. Mar. 1, 1932 UNITED STATES PATENT orrics ROBERT D. POGUE, O1 CHICAGO, ILLINOIS, ASBIGNOB 'lO m nnnrcnr mun: anon a FOUNDRY COMPANY, Oil wrumre'ron, nmwnm. A. CORPORATION OI rm- WARE ram anon Application filed arms is, me. mm Io. man.

This invention relates to railway brake shoes of the type having a ductile metal back and its object is to provide a strong and substantial anchorage of the body of the shoe to the metal back to hold the body securely to the back and to prevent parts of the body from falling away in case of fracture.

A further object of the invention is to rovide a strong and ri id back which wil re- 10 sist tendency to straighten or flatten out in event of fracture of the body and will maintain the fractured body in serviceable condition and prevent the parts thereof from fallmg away. 15 And a further object of the invention is to rovide a simple means for securel anchorin" the ends of the body to the bee plate.

in the accompanying drawings I have selected a locomotive shoe for illustrating the invention and referring thereto,

Fig. 1 is a side elevation,

Fig. 2 is a top plan view, and

Fig. 3 is a sectional view on the line 3-8 of Fig. 2.

Referring to the drawinfi, 5 isthe body, 6 is the bac plate and 7 is e attachin lug, these arts being, in general form an construction, well known in the brake shoe art. The body may be made of cast iron, with or without chilled portions or with inserts 8. The back plate and the lug are preferably made of steel and the plate is provided wi openings into which the body metal flows during the casting operation to embed the back plate in the body to form the back thereof. The In is engpged with the back plate and embed ed in t a body in any suitable manner to secure it to the body.

The shoe is of the flanged type and the back plate is made accordingly to cover the flanged as well as the flat art of the body. The flanged side edge 9 o the plate is embedded in the body and the opposite side edge 10 of the plate is bent downward and is embedded in the body. The openings 13 in the flanged part of the plate are arran d in two series on opposite sides of a me is] plane passing through the flanged part of the shoe and extending perpendicularly to the axis of the wheel with which the shoe is adapted to be used, the openings in each series being- {peed apart and sta red with relation to e o ings in the 0 er series, except at the en of the flange where the openings are opposite. The opemntgls in one series in the flange do not overlap e openings in the other series and this leaves a continuous unbroken portion 12 between the two series of stri s. extending throughout the length of the an of the back which stiflens the back and ed s to its rigidity; This is a. feature of importance in my invention because it helps to prevent the back from straightening or flattening duringh service when the bod fractures and, in is we helps to hold e fractured parts of the y together so that the shoe can continue in service and give eflicient braking. It is well known that when the body of a shoe fractures the tendency duringilservice of the shoe is for the back to straig ten or flatten, thereby opening up the cracks in the body and making the shoe less eflicient in braki efiect and the anchorge of the body rtions to the back less e ective and more ieble to brake awa from the back. But, if the normal rigi itv of the back can be maintained after the body is fractured, the parts of the body will be held together in substantially the position they occupied in the body before it was fractured, thereb maintaining the braking and anchoring e ciency.

The openings 13 are radially disposed to the center of the arcuate flange of the back and the walls of the openings are beveled at the sides of the o emngs longitudinally of the back so that e body metal is buttoned in the openin s and is thereby securely anchored to the ba The openings are punched in a blank late and the arcuate flange on the plate is ormed which inclines the side walls of the openings longitudinally of the late with respect to each other to cause the body metal to form a button 11 in the openings during the casting operation. The late is also provided with a series of openings 16 adjacent the side ed IOand these openings are arranged in su stantial alinement and extend through the corner 15 of the plate mid partly in the flat portion of the plateend partly in the downturned marginal portion 10 of the plate. These holes are also stamped back to also produce buttons 14 on the body.

when the body metal solidifies in the casting operation. This buttoning of the body to the back at the flange and at the opposite edge of the shoe is highly important in providing a permanent anchorage of the body to the back, and it also has the effect of increasing the rigidity of the back .and maintaining the general shape and contour of the shoe.

I provide a plurality of openings 17 arranged in substantial alinement transversely of theflat portion of the back at the end of the shoe to receive the body metal and to anchor the ends of the body to the ends of the back. It is found in practice that this method of anchoring the body to the back at the ends of the shoe is especially eflieient; it provides a much larger area of connecting metal between the end stops 18 on the back of the shoe and the body of the shoe than has been customary heretofore and this enlarged connectin area is divided in such a way that strengt and rigidity of the back is not impaired at this portion of the back, and the anchoring of the end stops to the body and of the body and end stops to the back is made more substantial and efficient. I also provide a pluralit of openings 19 in the flat portion. of the ack plate between the arcuate flange and the downturned flange and these openings may be elongated, as shown, or in an other desired shape.

My invention provi es a brake shoe of strong and substantial construction in which the body is securel anchored at and between its ends to the bac plate so that in event of fracture of the body the parts thereof will be securely held together and the shoe will be maintained in serviceable and efiicient condition. The arrangement of the openin in the and a plate embedded in the back thereof, the plate having an arcuate flange on the flanged part of the body, and said flanged part of the plate having two series of spaced openings located respectivel on opposite sides of a medial plane passln through said flanged partof the body and extendlng perpendicularly to the axis of the wheel.

2. A flanged brake shoe comprising a body and a plate embedded in the back thereof, the plate having an arcuate flange on the flanged part of the body and a downturned flange at its opposite marginal edge, the arcuate flanged part of the plate having two series of spaced openings located on opposite sides of an integral, continuous and unbroken centrally disposed longitudinal strip portion, and the opposite flanged portion of the plate having a series of openings extending through the corner of the plate formed by said flange,

the body metal extending into all of said openings and having a button anchor therein.

ROBERT B. POGUE.

arcuate flange and in the corner of t e plate formed by the downturned flange is important because of the efiicient anchorage afiorded and the arrangement of the two series of openings in the arcuate flange on opposite sides of a continuous unbroken strip, with the openings staggered between the end portions of the plate, is important because of the added anchoring efi'ect without impairing the rigidity of the plate.

Changes in the form, construction and arrangement of parts of the invention may be made to adapt it for different sizes and shapes of shoes, or to meet other conditions, and I reserve the right to make all such changes as fairly fall within the scope of the following claims.

I claim:

1. A flanged brake shoe adapted for cooperation with a wheel and comprising a body

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