US1373538A - Brake-shoe - Google Patents

Description

J. S. THOMPSON.

BRAKE SHOE.

APPLICATION FILED DEC.17,1919.

Patented Apr. 5, 1921.

, UNITED STATES".

P TENT? oFFIcEf nuns s. 'mourson, or PELHAM, NEW YORK, Ass xenon romnn 'hxnniem nmn error: a sounnnv coummr, or wrmnne'ron, nmwazaa, A conronnrron or DELAWARE.

Application filed December 17, 1919. Serial m5. 345,5.

To all whom it may concern.

Specification of Lettcrslatent.

BRAKE-SHOE. I

.. Patented Apr. 5, 1921.

Fig. 5 is a fragmentary perspective view Be it known that I, JAMES S. THOMPSON, illustrating a modification of the invention.

a citizenof the United States residing at Pelham, in the count of Westchester and State of New .York, ave invented certain new and useful Improvements n Brake- Shoes, of which the following, is a specifiv to a minimum the wear on the brake head by the lug of the shoe, and to construct the lug and associalte it with the reinfo-rcingfba'ck of the shoe in a novel manner to avoid damage to the brake head and to the shoe by reason of the strains and blows to which the In is subjected inactual service.

ore particularly my invention has for its object to provide a strong and substantial.

lug for a center-fastening shoe which presents smooth, non-wearing surfaces to the brake head and which is so engaged and supported by thereinforcing back ofthe shoe that the forces or blows which are applied to the lug in the application of the brakes in service will be distributed through the reinforcing back over a considerable area of the shoe to thereby avoid the dangerof fracturing the bodyof the, shoe beneath the lug which might happen if the forces or blows were transmitted by the lug entirely to that portion of the body of the shoe beneath the lu v .lhe objects of my invention will more fully appear in the detail description thereof as embodied in a selected form in the accompanying drawings, referring to which- Figure 1 is a perspective view showing my invention embodied with one form of reinforcing back.

Fig. 2 is a fragmentary perspective view of that part of the back with which the lug is directly engaged.

Fig. 3 is a perspective view of the lug detached from the back.

Fig. 4 is a transverse sectional view through the lug of a shoe embodying the invention.

Referring to the drawings, the-reinforcmg back 6 1s provided with an opening 7 formed by cutting the back on parallel lines extend ng longitudinally thereof and on a transverse line connecting said parallel cuts and strikin up the supports 8, 8. -'The lugs '9 may be ormed out of a strip of stra and the lower narrow parts of the lug. I

prefer that each shoulder be perpendicular to the edge of the lug. The narrow partof the lug may be formed by cutting away the idgjes from each shoulder to the end of the The lug may be assembled with the reinforcing back by pushing it u through the opening 7 and then forcing the supports 8 into engagement with the shoulders 11, orif the feet of the lug are not bent outwardly, they can be pushed down through the openmg 7 from the top of the back until the shoulders engage the. supports after which the feet may be bent outwardly into position to engage the back. The body 12 is cast on the back and lug in the usual manner and 1n any form desired and the body metal is preferably run up into the lug to or about the level of the upper edges of thesupports 8 to form a reinforcing and strengthening lfiller 13 for the lug and a bearing for the y improved lug is designed and proportioned to fill the opening provided for it in the brake head so that there will be a fair but not a tight fit between the lug and the head. For practical reasons, which are well understood, it is not possible to fit the brake shoe to the head so closely and so snugly that movement of the shoe relative to the head will be prevented. In all shoes which are secured to brake heads through the medium of a single lug there is always possible a lengthwise movement of the lu in the head, to a more or less extent, when the brakes are applied as. well as, when the shoes are hanging free. If the lug is made of ductile metal and no provision is made ainst such movement the edges of the lug will engage the walls of the opening in the head with a cutting wear, due, to the movement of the shoe relative to the head, which will incourse of time seriously damage .the

brake head. My invention avoids the possibility of this damage to the brake head by protecting the lug so that its edges will not estructively engage the brake head with a cutting wear. The lug is provided with fiat bearing surfaces by the supports 8 of sufiicient area to engage the opposite walls of the o ening in the head without wearing the hea destructively. The supports 8 are preferably flush or substantially'flush with the edges of the upper wide part of the lug, and since these supports form broad fiat non-wearing bearing surfaces which engage the Walls of the openin in the head, the edges of the lug above t ese supports cannot cut into the walls of the opening in the head.

In the ordinary application of the brakes the lug is subjected to pounding 0r hammerin blows of considerable force on its top. Ti the force of these blows is transmitted directly to a restricted section of the body of the shoe, at or about its center, they may fracture the body and serlousl y damage-the shoe. My invention avoids this by the engagement of the supports 8 wlth the shoulders 11 on the lug so that blows on the top of the lug will be transmitted primarily direct to the supports and througxh them to the back. Thus the force of blow is distributed in greater or less degree over the entire area of the backof the shoe instead of being concentrated over a small section at or about the center of the shoe. It is my opinion, based upon an extensive practical ex erience in the brake shoe art, that thisdistribution ofthe force of the blow im arted to the lug when the brakes are app ied will entirely avoid the Iloilkelihood of fracture to the shoefrom such Thus my invention, in its preferred form,

The reinforcing back and the lug are/made of ductile metal and in anyform desired for use on any kind of shoes to which the invention is or may be adapted. The construction is such that it is notnecessary to run the body metal up on'the outside of the lug to reinforce and strengthen the lug and-.to fill the openin in the brake head. The lug itself is of su cient size to fill the opening in the brake head andit is so constructed and protected that cutting wear b the lug on the brake head is entirely avoide In the drawings I have shown the invention embodied with one form of back and in a center-fastening locomotive driver shoe, and it is believed that this is suflicient for the purposes of this application. The invention lmay be. embodied with backs and shoesef other forms including, of'course; car shoes having centrally disposed fastening lugs, and I reserve the right to make al such adaptations and embodiments, and to make any changes in the form, proportion and construction of parts as fairly fallwithin the scope of the following claims.

I claim: I

1. A brake shoe having a reinforcing back and a fastening lu with open ends extending transversely o the back, parts of the back being arran ed at the open ends ofthe lug and exten ing'acrossfsaid open ends to engage a brake head and reduce the wear on the, brake head by preventing the ends of the lug from engaging with the brake head.

2. A brake shoe having .a reinforcing back and a fastenin In with open ends extending transverse y 'o the back, parts of the back being arranged at the open ends of the lug and extending across said open ends, sa1d parts being positively engaged with the lug to su port the lug against the force of blows on t e to thereof.

3". A brake shoe aving a reinforcing back and a fastenin lu with open ends extending transverse y o the back, parts of the back being seated in the lug at the open ends thereof and extending across said open ends to form bearings for the lug against a brake head and to support the lug against the force of blows on the to thereof.

4., A brake shoe aving a reinforcin back provided with an opening therein, a asten- .opening transversely 0 said back, and pro! ections struck up transversely from the ack at the open ends of said lug to en age the brake head and prevent the edges 0 the 5 lug from cutting sa1d head.

6. A brake-shoe having a reinforcin back provided with an opening therein, a asten laoj ing lug for the shoe comprisin an arch shape metal strip arranged in sai opening, and transverse projections .on the back engaging and supporting the lug against the force of blows on the top of the lug.

7 A brake shoe having a reinforcing back provided with an opening therein and upstanding supports parallel with the transverse edges of said opening, and a fastening lug for the shoe arranged in said opening and engaged with said supports.

8. A brake shoe having a reinforcing back provided with supports struck up transversely therefrom and forming an o ening therebetween, and a fastening lug or the shoe arranged in said opening and engaged with said supports. 1

9. A brake shoe having a reinforcing back provided with an opening therein and supports adjacent thereto, and a fastening lug for the shoe arranged in said opening and having shoulders engaging the top edge of said supports.

10. A brake shoe having a reinforcing back provided with an opening therein, and a fastening lug for the shoe comprising an arch shape metal strip arranged transversely in said opening and provided with shoulders on its edges, and supports on the back upstanding against the edges of the lug. and abutting said shoulders to prevent said edges from cutting the brake head and to support the lug against the force of blows on top of the lug.

, 11. A brake having a reinforcing back provided with an opening therein, a fastening lug for the shoe comprising an arch shape metal strip arranged in said opening, supports on the back bridging the open ends of said lug and extending upward part way to the top of the lug, and a body cast on said back and lug with the body metal extending up in the lug substantially flush with the top of said supports.

12. A brake shoe having a reinforcing back and a fastening lu with open ends extending transversely o the back, parts of the back being struck up therefrom and forming bearing surfaces extending entirely across the lug from side to side thereof at the open ends of the lug.

13. A brake shoe having a reinforcing back and a fastening lug with open ends extending transversely of the back, parts of the back vbeing struck up therefrom and seated in the open ends of the lug to support the lug against the force of blows on the top thereof and forming bearing surfaces extending entirely across the lug from side to side thereof at the open ends of the lu 14. A brake shoe having a rein orcing back and afastening lug with open ends extending transversely of the back, parts of i the back being struck up transversely therefrom and seated in the upstanding edges of the lug to support the lug.

JAMES S. THOMPSON. Witness:

M. A. KIDDIE.

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