US1065715A

US1065715A - Brake-shoe.

Info

Publication number: US1065715A
Application number: US71317512A
Authority: US
Inventors: Clifton D Pettis
Original assignee: Individual
Current assignee: Individual
Priority date: 1912-08-03
Filing date: 1912-08-03
Publication date: 1913-06-24
Anticipated expiration: 1930-06-24

Description

G. D. PETTIS.

BRAKE SHOE.

APPLICATION FILED AUG. 3, 1912 Patented June 24, 1913.

2 SHEET8SHBET L.

WHWR.

c. 1). PETTIS.

BRAKE SHOE.

APPLICATION FILED AUG. 3, 1912.

Patented June 24, 1913.

2 SHEETS-SHEET Z.

W W. m9

UNITED STATES PATENT OFFICE.

(mirror: 1); Firms, or CHICAGO, ILLINOIS.

- BRAKE-SHOE.

- Specifloation of Letters Patent.

Patented June 24, 1913.

-- Application filed August 3, 1912. Serial No. 713,175.

To all whom it may concern:

Be it known thatI, CLIFTON D. PE'1'1IS, a citizen of the United States, and a resident of the city of Chimp-o, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Brake-Shoes,v of which I do declare the following to be a full, clear, and exact description, reference being had to the accompanying drawings, f rming part of this specification.

The present invention has relation more particularly to that class of brake shoes for railway cars in which provision is made for strengthening the back portion of the shoe so that as the body of the shoe is worn away in service, the fracture of the shoe may be avoided.

The object of this invention is to provide a nexceedinglystrong and eflicientconstruction of shoe, and this object/is "accomplishedby the features of novelty hereinafter de-- scribed, illustrated in the arxzompanyin'g drawings and particularly pointed outin" the claims at the end of this specification- Figure 1 is an inner face view of the back or shell that incloses the back portion'of my improved shoe. Fig. 2- is an inner face view of a reinforcing back plate adapted to set within the back or shell. Fig; 3 is an inner face view of the back or shell with the back plate locked thereto by means of eenterand end lugs of the shoe. Fig. 4 is a view in front elevation and Fig. 5 is a side elevation of the completed shoe. view (upon an enlarged scale) of one of the end lugs before it is attached in position for use. Fig. 7 is a detail view of the center lug before it is attached to the shoe. Fig. 8 is a view in side elevation of the center lug shown in Fig. 7. Fig. 9 is a view in vertical 1 section on line 9 9 of Fig. 4. Fig. 10 is a view in cross section on line 1010 otx Fig. 4 Fig. 11v is a viewin cross section on line "dil -11 of Fig. 3. the cast metal body portion of the shoe being "indicated by dotted lines. The body portion A of my improved brake shoe is preferably for-med of cast Fig. 6 is a. detail the back or shell B are formed openings to receive the end lugs of the shoe. In the ac companying drawings I have shown an improved construction of center lu such as is set forth and claimed in application Serial No. 711,304, filed by me in the United States a Patent ()liice J uly 24, 1912, and have shown 12,1 2 -and"13, 13, and when my improved end lug is employed, the. end portions of the back or shell B will be provided with slots or

holes

14, 15, 16 and 17. The'back or shell B will also, by preference, be formed with holes 18 and the back "plate or member C with holes 19, through which will be'poured the cast metal of which shoe will be formed. V

In the preferred form of my invention, my improved shoe is not only provided-with a back or shell B at its back-and united thereto in the casting operation, but is also provided with a supplemental reinforcing member or members and, preferably,'in the shape of the back plate C of ductile metal. The preferred construction of this back plate or rel nforcing member is shown more particularly in Figs. 2 and3 of the drawings. The plate 6 is provided with holes-or

openings

20, 20 and 21, 21 to receive the locking members of the center lug, as will presently appear, these holes or openings corresponding with the'holes or

openings

12, 12 and 18,13- about the center of the'back or shell B. Similarly, the plate 0 is provided adjacent each of its ends with holes or

openings

22, 23, 24 and 25 adapted to receive the locking members of the end lugs, these holes or openings corresponding with the holes or

openings

14, 15, 16 and 17 adjacent the ends of the back or shell B. I

lt will be readily understood that various forms of center lugs or end lugs may be employed in my improved brake shoe, but I prefer to employ end and center lugs of such character that they will serve to securely lock the back plate or reinforcing member the -of the -opening 25 of the back plate.

to the back or shell and, for this reason, my improved center and end lugs are shown.

The center lug, which may be formed of malleable metal or of plate metal, is shown as comprising a crown 30 (see Figs. 7 and 18) having side walls 3] reinforced by latings 3 the purpose of which will presently more fully appear.

My improved construction of end lug is shown as comprising a transverse wall 40 adapted to extend across the end of the brake shoe, from which wall depend

short locking members

41 and 42 and a longer locking member 43 having an opening 44 formed .therein.- ,At right angles to the tranversewall 40extends an inwardly projecting part, 46"from which rise the walls 47, and integral with the part 46 is formed a locking member 48.

In forming my improved brake shoe, the reinforcing back plate or member C will first be placed within the back Or shell B in such position that the center and end openings of the back plate shall coincide with the corresponding central and end openings of the back or shell. The locking members 35 of the center lug will then be passed through the openings 13, 13 of the back or shell B and through the

openings

21, 21 of the back plate. C, while the locking mmbers 36 of the center lug will be passed through the

openings

12, 12 of the back or shell B and through the

openings

20, 20 of the back plate. After the locking members of the center lug have thus been passed through the openings of the backor shell and of the back plate, the locking members 35 on the lug will be turned outwardly and the locking members 36 will be passed through the holes 37 in the locking members 35, after which the free ends of the locking members 36 will be bent laterally, so that the parts will assume the position shown in Figs. 3 and 10 of the drawings. In like manner the locking member 43 of each of the end lugs will be passed through a corresponding opening 15 in the back or shell B and a coincident opening 23 in the back plate C, while the

locking members

41 and 42 will be passed through the openings 14 and 16 of the back or shell B and through the

coincident openings

22 and 24 of the back plate C; and the locking member 48 will be passed through the opening 17 of the back or shell and through the coincident After the locking members have thus been passed through the openings of the back or shell toward the center of the shoe and the locking member 48 will be passed through the opening 44 of the locking member 43,

and the end of the locking member 48 will be bent toward the center of the shoe. The

'locking members 4-1 and 42 will be bent toward the center of the shoe, as shown in Fig. 3. center lugs and of the end lugsbave thus been bent, not only will the lugs be securely connected to the back portion of the shoe, but the locking members of the lugs will serve to inost effectively lock the back plate to the shell or back B. After the back plate and center and end lugs have been attached to the back or shell B, as shown in Fig; 3 of the drawings, the body A will be cast on to these parts, as indicated more particularly in Figs. 5, 9 and 10 of the drawings. Preferably, the pouring of the cast metal, of which the body of the brake shoe'will he formed, will be effected through the pouring \Vhen the locking members of the holes 18 of the back or shell B and holes 19 of the back plate C, and the cast metal not'only firmly unite with the back or shell B in the casting operation, but will firmly unite also with the back plate 0 and with the locking members of the. center and endlugs, thus guarding against anygpossibility of the withdrawal of the lugsfor' separation of the parts. i

I prefer to reinforce my improved brake shoe with a pan shaped back portion B, the sides and end walls of which are cgmparatively shallow, for the reason that until the body A of the brake shoe is very materially reduced in thickness, it has strength to guard against fracture. And it is when the body A of the shoe approaches the end of its wearing capacity that the reinforcement of the back is required. A further reason for using a shallow back or shell B 'and for forming this back or shell of thin'metal is, that the construction is far less expensive than if the walls of the back or shell were arried to the face of the body of the shoe. nd eed, the thin metal of the back or shell B $0 coalesces with the body A of the shoe in the casting operation as to form in effect a tough skin or cover for the back portion of the shoethe metal of the back or shell B being thick enough, however, to stand upand maintain its shape under the heat of the cast metal when the latter is poured into the mold.

By having the integral side and end walls b and b of the shell B of such dimensions that the edges of these walls terminate at a distance from the initial wearing face of the shoe, the side edges of the latter adjacent as shown in Fig. 10, and as required to properly engage the treaden flange of the car wheel. Moreover, by employing a shal- -low shell which is of course curved to correspond with the form of the shoe, the shell may be more readily and cheaply manufactured. It is understood that the side and end walls I) and 7) are not only integral with the back of the shell, but are integral with one another to securely support the body of the shoe when worn thin.

The reinforcing back plate abuts against the inner face of the back wall of the shell B and, while itextends approximately from side to side and from end to end thereof, it is smaller in area than the back wall of the shell to permit the metal of the body A to unite with the back wall in the casting operation. Preferably, also, the reinforcing member C is provided with lips c at intervals throughout its lengt-h'which are bent inwardly away from the inner face of the back of the-shell. These lips thus increase the area over which the cast metal body is united to the back of the shell and are also embedded in the cast metal body to more efl'ectively unite the parts.

Various other forms of back plates or reinforcing members may be used without departure rom the spirit of the invention, and the details of construction above set out may also be varied within .wide' limits without departing from the scope of the invention. Thus, for example, the feature of employing a reinforcing back plate or member within an inclosing shell may be used to ad vantage even with a body portion formed of any of the compositions of material commonly employed in the manufacture of brake shoes, but in such case, of course, it will be necessary to give greater depth to the body of the hacker shell. So, also, features ofthe invention may be employed without its adoption as an entirety.

Having thus described my invention, what 'I claim as new, and desire to secure by Letters Patent, is

1. A brake shoe comprising a cast metal body provided with a shallow reinforcing back or shell formed of thin ductile metal and having integral side and end walls surrounding the body of the shoe and terminatingabove the initial wearing face of the shoe, said shell being united directly to the metal body of the shoe in the casting operation.

9. A brake shoe comprising a cast metal body, a pan shaped ductile metal back and a supplemental reinforcing back plate located within said pan shaped back, said I supplemental reinforcing plate being of smaller area than the back wall of said ductile metal back to permit the cast metal of the body to unite with said back wall int-he casting operation.

3. A brake shoe comprising a cast metal .body having curved edges at the sides of its member located withinsaid back and extending approximately from side to side and from end to end thereof and center and end lugs having parts passing through said back and bent about said reinforcing member.

5. A brake shoe comprising abody having a ductile metal back and having a supplemental reinforcing back member located within said back, and end lugs having parts passing through said back and through said reinforcing member, the ends of said parts being bent to interlock said back and said reinforcing member together.

6. Abrake shoe comprisin a cast metal body having a perforated bac of thin ductile metal bent to form ashallow pan or shell, a supplemental reinforcing member of thicker ductile metal and lugs connecting said back and supplemental member, the ends of, said lugs being bent and embedded in the cast metal body of the shoe.

7. A bra-kc shoe comprising a cast metal body, a pan shaped ductile metal shell and a supplemental reinforcing back plate of ductile metal secured thereto within said ductile metal shell, said supplemental reinforcing plate being providedwith lips bentaway from the back wall of said shell to extend within the body of the shoe and permit the metal of the shoe body to unite with said back wall in the casting operation.

8. A brake shoe comprising a cast metal body having, a pan shaped back of thin ductile metal, a supplemental reinforcing mem her of thicker ductile metal located within said pan shaped back and a lug for attachment to the brake head, said lug having bent ends interlocking said back and supplemental member and embedded in the cast metal body of the shoe.

CLIFTON D. IETTIS.

Witnesses Geo. P. Fisnnn, I(A'IUAR|NE Gunmen.