US1382785A - Interlocking brake-shoe - Google Patents

Description

E. L. MRDN.

NTERLOQKlNG BRAKE SHOE.

AEPLlcATloN FILED MAY5.1920.

` 1,382,785-, Panfewm 28, 19m,

UNITED STA'lEFl PATENT QFFICE.

ROBERT L. JORDAN, OF CHICAGO, ILLINOIS.

ElTERLOCKlNG BRAKE-SHOE.

To all whom t may concern Be it known that I, Bonnin: L. JORDAN, a citizen of the UnitedStates, residing at Chicago, in the county oi Cook and State of illinois, have invented certain new and usei'ul improvements in Interlocking Braketihoes, ot which the following is a specific; tion.

This invention` relates to improvements in railway brake shoes, `and has reference more especially to that type of brake shoe which is adapted to have attached to the tace or wearing portion thereof a back or rear portion of a partially worn brake shoe, so that such partially worn shoes, instead of being scrapped as at present, may be entirely used up by applying thenr to new brake shoes. rlhis type or' brake shoe is commonly known as an interlocking shoe.

Various constructions of interlocking brake shoes designed to save most oi' the waste or scrap of ordinary shoes and to effect an economy of metal have heretofore been proposed, but the chief objection heref totore existing in shoes of this type has resided in the fact that the partially worn shoe, when worn down very thin, breaks in two, and fragments thereof tall away, being liable to lodge in rogs or switches and cause trouble, in addition to sometimes destroying the smooth wearing tace of the shoe structure which remains on the brake head.

Another objection, which has heretofore inhered in many interlocking shoes, resides in their unduly complicating structure, making them impractical on the score of expensive cost ot production.

With these laults in view, l have devised the interlocking brake shoe or the present invention, one object olE the latter being to provide an interlocking shoe of such a construction that'the worn shoe may be practically entirely used up, without leaving fragments or chips of any substantial size, such as might cause possible mischief from falling onto the track. Another object is to provide an interlocking shoe having means for attaching the worn shoe to the new shoe so securely as to prevent any danger cgt its becoming detached in service. This object is attained chiefly by the provision of a novel attaching or securing key which itself is locked in place by the same key which attaches the new Shoe to the brake head. Still another object is to provide a brake shoe of great strength to resist breaking strains, this Specification of Letters atent.

Patented June 28, 1.921.

ieee. serial No. 379,169.

object being attained by the use of a novel malleable metal insert.

@ther objects and advantages of the invention will be apparent to those skilled in the art from the Afollowing detailed description, when taken in connection with the accompanying drawing in which l have illustrated one practical embodiment of the novel structural features of the invention, 'and in which Figure l is a central longitudinal section ot a complete assembly comprising a brake head, a new shoe attached to the brake head, and a partially worn shoe or slipper 'attached to the wearing iace oit the new shoe;

Fig. 2 is a bottom plan view of Fig. l, with the transverse locking key omitted;

Fig. 3 is a vertical transverse section taken on the line 3-3 of Fig. l;

Fig. l is a transverse section taken on the staggered line lof Fig. 2;

Fig. 5 is a side elevation, partly in section, ot the malleable insert; and,

Fig. 6 is an elevation of the transverse locking key by which theworn shoe or slipper is secured to the tace of the new shoe.

Referring to the drawings, l0 designates the brake head which is of the well known standard construction, and need not be particularly described. l1 designates, yas an entirety, the' body of the shoe itself which, in the preferred embodiment of the invention, includes a malleable iron insert which is shown in side elevation in Fig. 5 and is preterably et the :full thickness of the shoe, the insert also having termed integral therewith the usual central attaching lug. First describing the malleable insert, the same coinprises a central bridge plate 1 2 Yfrom which rises the central attaching lug 13 termed with the usual aperture 14 tor the passage oit the main fastening key l5 or the brake head, and spiral, generally S-shaped, extensions 16 (Fig. 2) extending from the opposite ends of the bridge plate 12 toward the outer ends of the shoe, and thin sti'l'liening strips 17 'and lS connecting` and bracing the inner and outer limbs ot the @shaped members in the region closely adjacent to the back of the shoe.

Around this malleable insert is cast the gray iron body 29 having, in general, the structural form of a standard shoe and provided at the opposite ends of its back with the usual concave guide lugs 20 for the forked ends of the brake head l0, and trans- V removed and then applied to the face of a nid verse abutment lugs 2i for the ends of the brake head. Centrally oi' rthe tace of the shoe, however, is a socket 22 into which lits the central attachment lug i3 of' the worn shoe. rlhe bottom wall of this socket, which is constituted by the central platel2 of the insert, vis formed with a central transverse slot 23, and in registerl therewith is a transverse slot 24 formed through the central attachment lug` 13. the slot 23 are shoulders 25.

At the opposite ends of the wearing tace of the shoe body are termed transverse notches 26 to receive the transverse lugs 2 1 of a worn shoe, and also sockets 27 inwardly of the notches 2G to lit the guide lugs 20 of the worn shoe; these interiittiiig lugs and sockets acting to resist endwise displacement or the worn shoe from the new' shoe under the frictional drag ofthe worn shoe on the wheel.

28 designates, as an entirety, a locking key that extends through the transverse slots 23 and 24 of the two internested shoes in the manner clearly shown in Figs. land This key is provided with an aperture 29 through which passes the brake head key l5, thereby locking it in place; and on the lower end of the key 28 are lateral ears or lugs 30 that abut squarely against the shoulders 25 ot the worn shoe, in the manner most clearly shown in Fig, 3, whereby the worn shoe is locked against separation from the new shoe so long as the lugs 80 remain effective; andsince the shoulders 25 `are in or above the pla-ne or' theback wall of the shoe, it follows thatthe body of the wornshoe will be completely ground off by the time its locking means has'been destroyed or rendered useless. Hence, in the actual use of the device, the only chips that result are those representedby the guide lugs 26 and V27, which are so small as to represent negligible waste not likely to cause injury by Ytalling to the track. V

ln the practical use of the invention, a new shoe vin first applied to the brake head, and when the saine is worn down to one halt or one-third its original thickness, it 'is removed and applied to the face of a new shoe, the `two being then applied to the brake head, resulting in the combinedinterlocking structure illustrated in Fig. l.A This struc-ture is then used until the worn shoe vhas been used up and the second new shoe has worn away to a point at which it is too thin for further use alone, whereupon it is third new shoe, and so on l am aware that it has heretofore been proposed to attach a worn shoeto a new shoe by means of central transverse key lugs on each ot' twoshoes which have a spring1 locking engagement with each other. 'Suc i a connection, however, is uncertain and unf'it the opposite ends of worn away, and this one-piece key can itself be locked in place by the ordinary brake head fastening key.

ll claiml. An interlockingbrake shoe, comprising a new shoe having a central apertui'edattachment lug on its back for attachment to a brake head, and a central socket in its face shaped to receive a like central attachment lug or" a. worn shoe, a partially worn shoe fitted to the face of said new shoe, and a one-piece locking key passed through both attachment lugs and secured by the brake head fastening key.

2. in interlocking brake shoe, comprising a new shoe having a central apertured attachment lug on its back for attachment to abrake head, and a central socket in its face shaped to receive a like central attachment lug of a worn shoe, both of said attachment lugs being transversely slotted, and a one-piece locking key passed through the transverse slots of said attachment lugs and having an aperture in registerwith the aperture of the outer attachment lug and adapted-to be entered by the ,brake head tastening key. y

3. `An interlocking brake shoe, comprising a new shoe having a central apertured attachment lug on its back for attachment to a. brake head, and a central socket in its tace shaped to receive a like central attachnient lug of a worn shoe, said attachment lugs being transversely slotted and formed with abutment'shoulders at opposite sides of the lower end of the slot, and a locking key passed through the transverse slots of said keeper lugs, said locking key having at itslower end abutment lugs engaged with said shoulders and having an aperture in its upper end in register with the aperture of the outer keeper lug and adapted to be entered bythe brake head fastening key.

4. A brake shoe having a malleable insert extending throughout themajor portion' of the length otl the shoe, and said insert including a central apertured attachment lugV on the back of the shoe.

5. A brake shoe having a malleableinsert con'iprising a central bridge plate and curved extensions leading from the ends of said bridge plate toward the ends of the shoe, and a central apertured attachment lug on the back of the shoe integral with said bridge plate.

6. ,ik brake shoe having a malleable insert comprising a central bridge plate of less thickness than the slice body and disposed in the back region of the latter, S-shaped extensions leading,` from the ends of said bridge plate toward the ends of the shoe and ot the lnll thickness of the latte-r, and a central apertnred attachment lug on the back ot the shoe integral with said bridge plate.

7. A brake shoe having a malleable insert comprising a central bridge plate of less thickness than the shoe body and disposed in the back region of the latter, fa-shaped extensions leading 'from the ends of said .bridge plate toward the ends of the shoe and iof the full thickness of the latter, stilfening strips connecting and bracing the inner and outer limbs of said S-shaped eX- tenslons in the region adjacent to the back of the shoe, and a central apertured attachment lug on the back of the shoe integral with said bridge plate.

8. ln an interlocking brake shoe, a Shoe having a central apertured attachment lug on its back for attachment to a brake head, and a central socket in its face shaped to receive a like central attachment lug of a Worn shoe, said attachment lng having a. transverse slot, in combination with a locking key engageable With said slot, said locking ke)T having lateral lugs on its inner end for engagement with the Worn shoe, and an zpertnre at its outer end adapted to be entered by a brake head fastening key.

ROBERT L. JORDAN.

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