US1010397A - Brake-shoe. - Google Patents

Description

C. W.- ARMBRUST.

BRAKE SHOE.

APPLICATION FILED MAB. 8, 1911'.

Patented NOV. 28, 1911.

UNITED STATES PATENT o'nnron.

CHARLES W. AIBJMBRUST, 0F CRYSTAL LAKE, ILLINOIS, ASSIGll'OlR 0F ONE-FOURTH TO SYDNEY STEIN, OF CHICAGO, :ILLINOIS. 4

BRAKE-SHOE.

To all whom alt-may concern; I

that I, CHARLES W. Anar- Be 'it known BRUsT, a citizen of the United States, re-

siding at Crystal Lake, in the county of;

- ent application constitutes a division of my copending application, Serial No. 603,268, filed January 18th, 1911.

One of the novel features of my present invention resides in the construction wherein the interlocking parts on the back and face of the shoes, respectively, are constructed to be engaged in interlocking relation by moving one of the shoes transversely relatively to the other and the shoes are so shaped that when interlockingly engaged the central portions of-the interlocked shoes are spaced apart while the end portions thereof are in engagement with each other.

By reason of this construction the interlocking recesses with which the face of the shoe is provided may be made of minimum depth thereby enabling the greatest amount of material to be incorporated in a shoe of a predetermined thickness.

. Another feature and object of my invention-is the provision of a shoe having locking means disposedoutside the ends of the {end prongs of a brake-head for locking the shoes together, this position of the locking L -means enabling the shoes to be securely locked together .attheir ends. I

Another novel and advantageous feature of the invention resides in the arrangement of the locking lugs and cooperating locking recesses so that when the shoes are interlockingly engaged they i will be held against relatively transverse movement tending to disengage the locking means, as well as against separation.

Specification of Letters Patent.

,of the shoe shown in Fig. 2;

Patent d Nov. 28, 1911.-

Original application filed January 13, 1911-, Serial No. 603,268. Divided and tl i'i'sfapplication filed March 8, Serial No. 613,009.

. Other objects and advantages of the present invent on Wlll be apparent from the following description and accompanying drawings throughout the various views of which like reference characters" refer to similar parts.

Referring to the drawings-Figure 1 is a side elevation of ashoe'embodying one preferred form of my invention. Fig. 2 1s a back view of the shoe with the detachable holding lug removed. Fig. 3 is a face view and Fig. 4 is a sectional elevationon the line'4 4.of

Fig. 1.

On the drawings 5 designates the main body of a. shoe of general curved formation, the -curvature of the face of the shoe being 8 that when two shoes are interlockingly engaged the back and face of the interlocked shoes will be spaced apart intermediate their ends.

In order to maintain the proper reater than the curvature of the back so spacing of the adjacent back and face of the 7' interlocked shoes each back is provided on either side of the center with transversely disposed spacing lug's 6' arranged in parallel relation at right angles to the longitudinal axisof the shoe and spaced apart aproper 8b distance to snugly engage the outer ends of the brake head attaching prongs for the purpose of preventing torsional or twisting movement of the shoe relatively to the head whereby the shoe is maintained in alinement.

A central locking stud '7 is formed at the center of the back of the shoe, theends of the stud lying parallel with the longitudinal faces of the shoe being undercut, as indicated at '8, for interlockln a detachable holding or astenlng lug 9 by means of which-the shoe is attached to the I brake head,

When the shoe is to'be mounted the atlug- 8, by movement longitudinally of the shoe, whereupon the shoe may be secured in position by passing the ordinary locking key through the brake head attaching prongs and beneath a depression 10'being of the locking lug 7 the key. 1

It will be understood that the attaching provided in the top for the reception of engagement with 9 0 'taching lug 9 is engagefd with the locking the top of the lug 9,

prongs "ofthe brake head fit snugly into the depressions between the spacing ribs 6 and the central holding lug, so that said ribs in conjunction with the lug will prevent twisting movement of the shoe.

Adjacent the ends of the shoe and beyond the extremity of the brake head end prongs, are formed theend locking lugs 11, the side walls of these lugs being undercut to establish locking engagement with the undercut walls of locking recesses formed on the face of a similarly shaped shoe. Nearer the center of the shoe and preferably midway be- .tween the end locking lugs 11 and the cen tral locking lugs 7, I have provided locking lugs 12 also having undercut side walls similarly to lugs 11. On the drawings the lugs 12 are shown as being wider than the lugs 11 but it will be obvious that the width of the lugs may be varied within reasonable limits, as required. I

An undercut groove or recess 13 is formed centrally of the face of the shoe to receive and interlockingly engage with the central locking stud 7 of a similarly shaped shoe. i Undercut grooves orrecesses 14 and 15 are also provided on the face of the shoe, said grooves being spaced at requisite distances from the central groove and being shaped to receive and interlockingly engage with the locking lugs 12 and 11, respectively of a similar shoe. The locking lugs and the locking recesses are preferably tapered slightly'in order-to facilitate the removal of the pattern-during the casting operation.

It will be observed that the lugs 11 and 12 do not extend entirely across the back of the shoe but terminate short of one side thereof and that the grooves l3, l4 and 15 are open at one end to permit the entrance of the corresponding locking lugs and are closed at the other end to prevent relative lateral displacement of the shoes in one direction by reason of the engagement of the end of the locking lugs with the end walls of the grooves.

The shoes are fastened to the brake head with the closed ends of the locking recesses or grooves disposed outwardly," the open ends of the recess lying adjacent the flange of the wheel which may be'relied upon to prevent lateral displacement of the attachlng shoe inwardlyl In order to insure, however, against relative lateral displacement of the interlocked shoes without the aid of the wheel flange, I have so arranged the locking lugs and cooperative recesses that any relative movement between the shoes will have a tendency to draw them into alinement rather than to cause a relative lateral displacement. consists in forming the locking lugs 7, 11 and 12 with their longitudinal axes disposed obliquely to the longitudinal axis of the shoe 65 and likewise forming the locking recesses This arrangement 13, 14 and 15 with their longitudinal axes disposed obliquely to the longitudinal axis of the shoe. A

The shoe isfastened to a brake head with the open ends of the locking recesses above the closed ends so that when the locking lugs of another shoe are introduced into the recesses the action of gravity will tend to urge the lugs into the recesses and against the closed ends thereof, thereby insuring alinementof the interlocked shoes and maintaining the faceof the wearing shoe in. proper relation to the wheel. During the actual running of a car or locomotive equipped with shoes having obliquely arranged locking lugs as described, the continual vibration will assist gravity in urging the locking lugs against the closed ends of the recesses and when the brake is applied, the downwardly moving g5 tread of the wheel will further assist in drawing the interlocked shoes together. Should the brake be applied to a wheelievolving in the opposite direction relatively to the shoe, 2'. e., with the tread of the 0 wheel adjacent the shoe moving in an upward direction, the tendency would, of course, be to lift the shoe engaged with the wheel. relatively to the fixed shoe. The obliquity of the locking lugs and recesses is not grea't'enough, even under these circum stances, to afiord a wedging action between the walls of therecesses and lugs sufiicient to displace the shoe, and as soon as the brake is released, the locking lugs will again seek 10:, the lower ends of the recesses.

From the foregoing it is believed that the construction, operation and many advantages of ,the present invention, will be apparent without further description and it will be apparent that various changes in the size, shape and proportion of the various parts may be resorted to without departing. from the spirit of the invention or sacrificing any of the material advantages thereof.

I claim:

1. An interlocking brake shoe comprising a body member provided with a central locking lug, a pair of locking lugs spaced from said central lug, and a second pair of locking lugs spaced from the ends of the shoe but lying beyond the extremities of the end prongs of a brake head.

2': An interlocking brake shoe comprising a body member having a centrally disposed locking lug adapted to be lockingly engaged with a detachable fastening lug, a locking lug spaced from the end of the shoe, and another lug positioned intermediate the cen 12 tral and end locking lugs whereby the end prongs of a brake head are adapted to lie between said end and intermediate lugs.

3. An interlocking *brake shoe comprising a body member provided on its back with a 1 centrally disposed locking lug adapted to interlockingly engage witha detachable fastening lug, and a pair of locking lugs located near the ends of the shoe outside the 5. An interlocking brake shoe comprising a bodymember provided on its back with locking lugs disposed adjacent the ends thereof, a central locking lug adapted to be engaged by a detachable fastening lug, and intermediate locking lugs disposed between; said central and end lugs and having on its face locking recesses adapted to receive the locking lugs of a similarly shaped shoe.

6. A brake shoe comprising a body member provided on its back with a plurality of lugs arranged obliquely relativelyto the longitudinal axis of the shoe, one end of the lugs lying flush with the side of the body member, the other end terminating short of the opposite side of said member.

7 A brake shoe comprising a body mem ber provided on its face with a plurality o'f recesses arranged obliquely relatively to the longitudinal axis of the shoe, said recesses extending partially across the shoe and being open at one end and closed at the other.

8. An interlocking brake shoe provided on its back with a plurality 'oflocking lugs extending from one side thereof nearly to the other side and on its face with a plurality of locking recesses open-at one end and closed at the other end adapted to receive the locking lugs on a similarly shaped shoe,

said lugs and recesses being disposed obliquely relatively to the longitudinal axis of the shoe.

9. An interlocking brake shoe comprising a body member provided on its back with a plurality of locking lugs extending partially across theshoe parallelly arranged and disposed obliquely tothe longitudinal axis of the shoe, and having a plurality of locking recesses formed on its face and extending partially across the shoe to receive and interlockingly engage withthe locking lugs on a similar shoe; 10. A brake shoe comprising a body member having a centrally disposed locking. lug *on its back, the ends of said lug being adapt ed for interlocking engagement with a debeing disposed obliquely to the longitudinal axis of the shoe.

11. A brake shoe comprising a body mem-- her having a locking lug terminating short of the sides of the shoe and disposed centrally on its back, the ends of said lug lying parallel with the longitudinal axis of the shoe and the sides being disposed obliquely relatively to said axis. e

' 12. A brake shoe comprising a body member provided on its back with a centrally disposed locking lug, said lug having its ends disposed parallel with the longitudinal axis 'tachable attaching lug and the sides thereof of the shoe and undercut to be lockingly en-.-

gaged with a-det-achable attaching lug and having its sides disposed obliquely to the longitudinal axis of the shoe and undercut to interlock with a locking recess on the face of asimilar shoe. v

- CHARLES W. ARMBRUST Witnesses: V e

, IRA J .-W1LsoN',

M. Ronnn'rson.

five cents each, by addressing the '(lommlssioner of Patents,

Washington, D. 0.

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