US1328595A - Brake-shoe - Google Patents

Description

FITZ WILLI ARGENT.

BHAK HOE.

\ APPLI a. 1919. 1,328,595. Patented Jan. 20, 1920-.

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INVENTOR 1' z'iz WIILJaIyeILZ. I

A TTORNEYS UNITED STATES PATENT OFFICE.

FITZ WILLIAM SARGENT, OF MAHWAH, NEW JERSEY, ASSIGNOR TO THE AMERICAN BRAKE SHOE AND FOUNDRY COMPANY, OF WILMINGTON, DELAWARE, A CORPORA- TION OF DELAWARE.

BRAKE-SHOE;

Specification of Letters Patent.

Patented Jan. 20, 1920.

Application filed July 8, 1919. Serial No. 309,346.

To all whom it may concern:

Be it known that I, Frrz WILLIAM SAR- GENT, a citizen of the United States, and a resident of Mahwah, in the county of Bergen and State of New Jersey, have made and invented certain new and useful Improvements in Brake-Shoes, of which the following is a specification.

My invention relates to a new and useful improvement in railway brake shoes and particularly to a brake shoe of the type wherein the body portion is made from cast metal and wherein a back is used in connection therewith which is preferably made of wrought metal or mild steel, the purpose of the back being to reinforce the shoe and I to hold the parts together in case the same should be broken in service.

Heretofore the usual practice in making brake shoes of the class described has been to support the reinforcing back in the cavity of the mold into which the cast metal is poured to form the body portion of the shoe, whereupon the, steel back becomes firmly embedded in the rear surface or back of the shoe. Forming a shoe by this method, however, has its disadvantages in that frequently the high temperature of the molten metal burns or otherwise injures the back to such an extent that it materially weakens the same, thereby overcoming the advantages which would otherwise be secured. Furthermore, the shoe itself is sometimes weakened, as blow holes are formed in the cast portion thereof.

Again, after the steel back is once embedded in the shoe, after the shoe has worn down to the point where it is to be withdrawn from service the shoe and back must necessarily be scrapped.

An object, therefore, of the present invention is to provide a shoe having a steel or wrought metal back that may be inserted in the body portion after the same has been cast and whereinthe back maybe easily removed when the shoe is to be scrapped.

Still another object of my invention is to provide a shoe with a reinforcing back which is so arranged that after the same has been placed in the body portion certain portions thereof may be hammered or otherwise forced into pockets formed in the body portion so that there is no possibility of the body portion becoming disengaged from the back while the same is in service.

Still another object of my invention is to provide a brake shoe wherein the key lug and reinforcing back are all made from one strip of metal, known as the loop back shoe, and to reinforce the key lug by providing a transversely extending reinforcin strip embedded in the cast metal of the body of the shoe, thereby preventing undue strains from being brought to bear upon the side walls of the groove which hold the reinforcing back to the shoe body.

A further object is to reinforce the upstanding cast lugs of the body of the shoe by embedding therein a transverse lug reinforcing strip, the same cooperating with the integral lug of the reinforcing back. 1 lVith these and other objects in View, my invention consists in certain novel features of construction and combinations of parts as will hereinafter be more fully described and pointed out in the claims.

Referring now to the drawings: I

Figure 1 is a side elevation of the shoe, a part of the same being shown in section;

Fig. 2 is a top plan view of the same;

Fig. 3 is a sectional view taken on the line 8-3 of Fig. 1;

Fig. 4 is a side elevation partly in section of a modified form, and

Fig. 5 is a sectional view taken on the line 5-5 of Fig. 4:.

Referring now to the drawings, a body portion 1 is shown, and on the rear face thereof are provided the end lugs Also there are the two pockets 3 formed in the rear face of the shoe, adjacent the ends thereof, the bottom walls of the same being preferably slanted as at 4, with the rear walls 5 being more abrupt, or nearly vertical.

Two more pockets 6 are shown which are provided with the slanting bottom wall 7 and the upright end walls 8.

Extending longitudinally of the bodyof the shoe is the groove 9 having the clovetailed side walls- 10 so that a reinforcing back 11 which is provided with the tapered edges 12 may be forced through the groove 9, the tapered .walls 12 cooperating with the dove-tailed groove 9 to retain the same against lateral movement; it being under-- downwardly enlarging opening, and in the use of such term I do not wish to limit myself to a fan-tail shape groove.

The reinforcing back 11 is also bent midway between the ends to form the retaining lug 18, which lug is provided with the openings 14 for the reception of the brake key, this type of back being known as a loop back.

Also midway of the body portion of the shoe, as shown in Figs. 1, 2 and 3, are upwardly extending lugs 15 which are cast in the body of the shoe and extend slightly above the retaining lug 13 of the back, these lugs being designed to take up the stress of the brake head and also to prevent any lateral movement of the back with regard to the shoe. In order to reinforce the cast lugs 15 I provide the reinforcing transversely extending strip A, the same being composed of a top B, side walls C, and toes or anchoring portions D. The reinforcing strip extends above the looped lug 13 of the reinforcing back and, in addition to reinforcing the ,cast lugs, prevents undue strains from being brought to bear upon the looped lug 13 and the adjacent portions of the reinforcing back 11. The top of the reinforcing strip A'eXtends substantially flush with the top of the cast lugs 15, so that the brake shoe key when driven into place through the openings 14 will merely tend to compress the looped lug and the transverse strip rather than tend to tear the looped lug away from the reinforcing back; the looped lug and transverse strip constituting in effect an economical box-type lug.

Retaining means are also shown to prevent any longitudinal movement of the shoe with regard to the back, which means are an integral part of the reinforcing back and, as clearly shown in Figs. 1 and 2, consists of forming the lips 16 near the opposite ends of the back, these lips being-formed by cutting substantially crescent-shaped grooves 17 right out of the metal back.

Also near the adjacent ends of the back two further tongues 18 are shown, which are simply formed by doubly slotting the metal back so that the intervening portion may be forced downwardly into the aforementioned pockets.

To assemble the shoe and back it is only necessary to slide the reinforcing back 11 in the longitudinally extending groove 9 until the same is in the position as shown in Fig. 2, the dove-tailed grooves in the body of the shoe and the beveled edges of the reinforcing back cooperating to form a tight sliding fit, thereby preventing any longitudinal movement of the shoe with relation to the back. The lips 16 formed in the back may be then struck with a hammer or other implement and forced into the position clearly shown in Fig. 1; the end of the lip 16 abutting against the side walls 8 of the pockets 7 thus pre venting any relative longitudinal movement of the back or body portion of the shoe. The lips 18 may then also be forced inwardly and upwardly as clearly shown in Fig. 1 until the same rest within the aforementioned pockets 4, to further retain the key and shoe in their locked position.

After the shoe has become worn in service and it is necessary to scrap the same the lips 16 and 18 will again be straightenedout and the back may again be removed from the aforementioned longitudinal groove 9 in the body of the shoe.

In the modified form of shoe as shown in Figs. l and 5, a very similar arrangement has been shown, 6., a body 20 is provided with a longitudinally extending dove-tailed groove 21 and in which is passed the cooperating reinforcing back 22, which back is provided with the integral key lug :23; the back being also provided with the tongues 24 and 25, which are likewise to be forced into the pockets 26 and 27 which are similar in all respects to the pockets mentioned in the preferred form.

In this type of shoe, however, no side lugs 15 are formed in the body of the shoe opposite the key lug 23, the key lug23 fitting di reetly within a pocket (not shown) of a brake head.

From the foregoing it will be seen that I have provided a brake shoe consisting of the body proper provided with simply a longitudinally extending dove-tailed groove and I a. plurality of pockets near its opposite ends; and a reinforcing back having a portion thereof bent to form a key lug and other portions of the back out out to form two tongues near its opposite ends which may be forced downwardly into the aforementioned pockets when the body and back are to be assembled. By forming the body and back in this way the body portion of the shoe may be more perfectly cast and the back is not subjected to the intense heat to which it would be if it were to be embedded in the body portion of the shoe. Furthermore, the back does not have to be scrapped when the body portion of the shoe has become worn, but, on the other hand, by simply forcing the tongues out of the pockets the back may be removed from the body portion and inserted in a new body portion. Further, the transverse reinforcing strip prevents that portion of the metal of the bod of the brake shoe which lies directly unc er the looped lug from falling away should it become broken adjacent the sides of the looped lug, as oftentimes happens in service. Further, the presence of the transverse reinforcing strip strengthens the shoe at its weakest point, which is directly under the looped lug of the reinforcing back,

Having thus described and explained my invention, I claim as new and desire to secure by Letters Patent:

1. A brake shoe comprising a body portion provided with a longitudinally extending groove on the rear face thereof, said groove provided with dove-tailed side Walls, said body portion provided with a plurality of pockets near its opposite ends, a reinforcing back fitting within said groove and within said dovetailed side walls, said back being bent midway of its ends to form a. retaining lug, and said back having tongues near its opposite ends and adapted to be forced into the said pockets to thereby retain the body portion from longitudinal movement with regard to the back.

A brake shoe comprising a body portion and a longitudinally extending groove formed on the rear face thereof, a plurality of pockets also formed on the rear face of the body portion of the shoe and near the opposite ends thereof, said ockets having slanting bottom walls and su stantially upright end walls, a back fitting within said longitudinally extending groove, said back being bent midway of its ends to form a retaining lug, tongues formed in the back and adapted to be forced downwardly to abut against the end walls of said pockets to thereby retain the back and shoe in their proper relative positions.

3. A brake shoe comprisinga bodyportion and upright lugs formed midway of said body portion, said body portion provided with a longitudinally extending groove, the side walls of the same being dove-tailed, and a back fitting within said groove and cooperating with said dovetailed portions to thereby retain the shoe and back from relative lateral movement, said back being bent midway of its end to form a retaining lug, the sides of said retaining lug being opposite the aforementioned lugs formed on the body portion, two tongues formed near the opposite ends of said back and adapted to be forced into and to abut against the walls of the pockets formed in said body portion to thereby retain the shoe and back in their said position.

at. A brake shoe comprisin a body portion provided with a longitut inally extending groove in the rear face thereof and provided with a plurality of pockets near its opposite ends;

tion and near its opposite ends; a bac a reinforcing back tightly fitting within said longitudinally extending groove; tongues formed in the back and adapted to be forced into the aforei'nentioned pockets, one of said tongues extending be low the surface of the reinforcing back and one of said tongues extending above the surface of said brake shoe back when in their final positions.

5. A brake shoe comprising a body portion provided with a longitudinally extending groove in the rear face thereof and a plurality of pockets formed in said bod porff slidingly fitting within said longitudinally extending groove and bent midway of its ends to form a retaining lug; two tongues formed near each end of said back, one of said tongues being bent below the upper surface of said back and extending into one of said pockets, and the other of said tongues extending upwardly above the surface of the back and then downwardly into one of said pockets to thereby retain the shoe and back from any relative longitudinal movement.

6. A brake shoe comprising a looped lug reinforcing back with dove-tailed side edges, a bodyportion having a longitudinally extending groove with dove-tailed side walls receiving and interlocking with the reinforcing back, and a transversely extending reinforcing strip embedded in the body of the shoe projecting across the top of the looped lug of the back and reinforcing the same.

7. A brake shoe comprising a reinforcing back with an integral looped lug, a body portion having a longitudinal groove receiv ing and interlocking with the side edges of said reinforcing back, cast metal lugs integral with the body portion at the sides of the looped lug of the reinforcing back, and a reinforcing strip extending transversely of said shoe across the top of the looped lug of the back, reinforcing the same, and anchored in the cast lug of the body portion.

Signed at New York, borough of Manhattan, in the county of New York and State of New York, this 2d day of July, A. D.

FITZ XVILLIAM SARGENT. WVitnesses E. B. SIBBALD, \VALLACE B. SUTHERLAND.

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