US1924376A - Brake shoe mounting - Google Patents

Description

" Patented Aug. 29, 1933l 1,924,375" y BRAKE snor: MoUN'rING Robert B. rogue, Chicago, nl., assignent@ 'rhej American Brake, Shoe'and Foundry Company,` -Wilmingtom Del., a corporation of Delaware` This invention relates to brake shoes for railway cars and more particularly ,to a novel mannerand means fory mounting the shoe in place for service. `i

. It is' customary to removably secure a lshoe in a supporting head by means of a fastening key, considerable clearance being allowed between the interengaging parts of thelshoe and head to enable the shoe to be easily set in place and,se.

cured bythe key. The shoe is `provided with lugs on its back which engage parts on the head, and it is found that excessive wear of these en; gaging partsresults from the constant vibration of the shoe and head in service. Asthe wear of the parts continues the t becomes looser, the vibrations become Agreaterfand the wearing effectcorrespond ingly increases in intensity. is also known thiat the varying degrees of heat to which 'a shoe is subjected in service soon nproduces heat checks inthe Wearing face of the shoe which progress in depth and become substantial fractures in the body of the shoe. This progression of .the heat` checks to vfracture is greatly accelerated by theV vibrationto which the shoe is subjected inservice and results in parts of the bodyfalling. away or inthe reenforce back bending and finally breaking.` This vibration effect upon the body and'back of the shoe increases as' the interengaging` parts of the shoejand the head wear to looser t, and thishas been found tol occur generally during the early period lof service of. the shoe. When the body of the shoe fractures, the vibrations of service cause small parts of the` body at the fracture to Work loose andfall away, and this loosens the body on the reenforcing back and increases the vibration effect whichis further increased` by looseness of t of the' shoe on the head dueto wear. After the shoe fractures V service vibrations are com-` 45 for the shoe.

The primary object of my invention is to overcome the difficulties hereinbefore mentioned, and others incident thereto, by providing a sim'- ple and novel means for removably vsecuring and supporting a brakeshoe in a brakehead in substantially rigid position for service so Vthat it will be protected against the ill effects of wear on the head.

` Another object is to employ a spring steel fastening key and to provide for and require that Itl municated'directly tothe reenforcing back of Y this key be deflected in securing the shoe to the head so that the Vshoe'willvbe held in l,substam tially-rigid positionon the head and practically free from vibration lrelativev to the head. And a further objectv of the invention isjto provide a vbrake head of novel' construction which will forma substantial back support for the `shoe and vcooperate 4with the fastening 'means in holding the shoe in substantially rigid position to avoid weaving o1' bending or other relative movement of parts at orj'adjacentrthe fracture in the shoe. .i

In the accompanying drawing I havesillus-` trated a selected embodiment of the invention with a common castiron car shoe having a'. Steel strip `lug of similar form, 'andreferring thereto Fig. 1 is a lsectional view on the linefl--flfof Fig.3; "Fig. 2- is asectional view on the line 2 2 of Fig. 1;

Fig. 3 is a sectional vview on the line 3-3.of Fig. 1; and w 1 Fig. 4 is a' perspective view .of -the-fastening keys@ n v Referring to the drawing, the brake headl come prisestwo side members 5, which are" connected` togetherV at Athe 'back by the socket mem# i UNITED* STATES PATENTl ber 6 having `an opening 7 to receive the brake beam.` These y"sides are also: provided 1 at the top with aligned openings 8 toreceive'a hanger.

At the `frontof the head the sides are "cone y nected vby a faceplate!) which is divided linto two parts by thecentrally-A disposed recess 10 tof receive the attaching ilugfll of` the brake shoe 12. The recess extendsthrough vthe sides y ofthe head and it is preferably of a size adapted `to receive the attaching'lug snugly.VV The ends of the head engage the end -lugs 13'on the shoe, and the face plate 'of the headf is recessed at 14; to receive thev guide lugs `15 on the shoe to hold the shoeA aligned `with the head. On. the -back offthe lface platesat the top and bottom ofthe. recess 10there are bearing lugs 16 which have inclined'back faces 17 l disposed vin relation to the recess 10 and the opening'linV the attaching lug of theshoe to form guides for'thefastening key` 19 and to hold Ythis key in deflection while it secures the shoe in the head. The lugs project rearwardly fromvv the faceplate ofthe headto,` alignl substantially with the top Wall of the opening l in the attaching lug of the shoe and sufficiently to hold the key so tightly in deflection vthat it Will notV Work loose or permit movement of they shoe in the head. The inner end of the inclined face 17 of the lower lug 16 is so located that when the key is inserted in the attaching lug at the top thereof (Fig. l) and bearing against the outer end of the inclined face of vthe upper lug 16 the lower end of the key will engage the inclined face of the lower lug 16 and slide thereon, under pressure or blows supplied to the head of theA lug, todeiie'oted locking position as shown in Fig. l. For convenience in manufacture, and especially on a reversible head, both of the lugs .16 are preferably made' the key because its lower end will be guided Y to the inclined face of the lower lug by the high point ofthe upper lug and the attaching lug of theshoe, and after the end of the key en gages the inclined face of the lower lug it can be forced to locking position, as shown, by pressure or blows on its head.

While the invention is not expected to prevent heat checks in the wearing face of the shoe due to the varying temperatures to which the shoe is subjected in service, it will to a very large extent, if not fully, prevent the checks from progressing to open fractures and this, in turn, will prevent the weaving action which has been incident-to fractured shoes, and bending and breaking of the reenforce backs. The

` face plate of the head forms a substantially full coverage support for the back of the shoe except at the lugs thereon, and assists in hold-- ing the shoe in substantially rigid position and free from substantial vibration relative to the head.

This invention does not require any change in standard forms of shoes, and the shoes in the heads simplify the construction of the head and do not add to the weight or to the difficulties of casting.

I have shown the invention in a selected freight car shoe and head of simple construction to explain the invention and its advantages, b ut I `do not mean `thereby to restrict the invention to the form and construction shown. I may embody the' invention in other forms of freight car shoes and heads, and in passenger car and locomotive shoes and heads, and iniianged and unanged shoes, and I reserve .the right to make any changes in the form,

construction and arrangement of parts as may be .necessary or desirable within the scope of the following claims:

Iclaim: A, W I v 1. The combination of a brake shoe having an attaching lug, a brake head having a recess to receive the attaching lug and Ybearing lugs above and below the recess and adjacent'thereto, and a fastening key passing through the attaching lug and engaging the bearing lugs, said lugs holding the key in forward deflection between the bearing lugs and with its end portions extending rearwardly above and below the bearing lugs. I

2.The` combination of a brake shoe' having an attaching lug, a brake head having a recess to receive the attaching lug and bearing lugs above and below the recess and adjacent thereto',r said bearing lugs extending to align substantially with the top wall of the opening in the attaching lug, and a fastening `key passing through Ythe attaching lug and engaging' the bearing lugs' and being held in forward deflection by said lugs to secure the shoe on the head. Y,

3. The combination of a brake shoe having an attaching lug, a brake head having a" recessY to receive the attaching'lug and bearing lugs above and below the recess and adjacent thereto, and a flat resilient fastening key passing through the Yattaching lug and engaging theV bearing lugs, said lugs holding the key in forward derl'ection between the kbearing lugs and with its end portions extending rearwardly above and below the bearing lugs.

4. rlhe combination of a brake shoe having an attaching lug, a brake head having a recess to receive the attaching lug, and a fastening key engaging the attaching lug and securing the shoe on the head, said head having bearing lugs thereon above and below the recess to hold the key in defiection while in engagement with the attaching lug and prevent movement ofv the shoe on the head, said bearing lugs having back faces inclinedl forwardly and toward eachother.

, 5. The combination yof a brake shoe having 'an V attaching lug', a brake headvhavl'lg vaf'eceSS to bearing lug being inclined vupwardly-and forwardly to receive the endv of the key as it pro- 'l jects. through the attaching lug and to cause the key to deflect as it is driven to final Vposition;

6. A brake head having a ,face plate and a recess therein to accommodate 'the attaching lug of a brake shoe', and bearing lugs on the back of the Yface plate above and below said recess, said bearing lugs having back faces in-Y clinedforwardly and toward each other.

ROBERT B POGE.

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