US1484434A - Eeake-shoe mold - Google Patents

Description

Feb. 19, 1924.

J. s. THOMPSON BRAKE ,SHOE MOLD Filed Aug. 1, 192.5

/r f 2,6/7@ S Patented Feb. 19, 1924.

PATENT OFFICE.

JAMES S. THOMPSON, 0F PELHAM, NEW YORK.

BRAKE-SHOE MOLD.

Application filed August 1, 1923. Serial No`. 655,064.

To all whom t may concern.'

Be it known that l, JAMns S. THOMPSON, a citizen of the United States,residing at Pelham, inthe county of Westchester and State of New York, have invented certain Inew and useful Improvements in Brake-Shoe Molds, of which the following is a specilication.

This invention relates to the manufacture of brake shoes and more particularly to the mold in which the brake shoe is cast, and its object is broadly to enable a brake shoe to be cast in a permanent mold as well as it can be cast in a sand mold with a saving cf time and a reduction in cost.

A further object of my invention is to provide a permanent mold of the character described having improved means for permitting the gases to escape from the mold cavity during the casting operation.

A still further object of my invention is to provide improved means for supporting or securing in place in the mold cavity the parts which are to be embedded in the shoe casting.

Other objects of my invention will become apparent as the vdetail description progresses, reference being had to the accompanying drawing showing a selected embodiment of the invention and in which- Fig. 1 is a central longitudinal section through apermanent mold embodying theY novel features of my invention, the mold being adapted toproduce a brake shoe `of lapproved type with an integral composite wearing face.

Fig. 2 is a transverse section taken on line 2-2 of Fig. 1, and l Fig. 3 is a central longitudinal section through a permanent mold embodying the novel features of my invention but being adapted to produce brake shoes of substantially uniform texture.

The mold shown in Figs. '1 and 2 comprises a drag l() and a cope 11 having a pouringgate 12 at one end. The mold cavity 13 is formed partly in the drag and partly in the cope and it has a top wall 111, a bottom wall 1 5, end walls 16 and 17 and side walls 18 and 19. A refractory section 2O is seated snugly in the bottom wall of the mold cavity and refractory sections 21 are seated in the top wall of the mold cavity to prevent the metal of the mold from having a chilling efect upon the casting at the places where these refractory sections constitute wallsurfaces of the mold cavity. The refractory section 20 is of less length than the length of themold cavity and end portions of the bottom wall of the mold cavity as well as the end walls 16 and 17 of the mold cavity are left bare, as shown, so that the hot metal of thecasting. will contact directly ywith the metal of the mold to produce a shoe having Vchilled end portions. rilhis .type of mold is constructed for casting an approved type of brake shoe withan integral composite wearing face having chilled end portions and an intermediate unchilled portion.

The cope 11 is provided with a recess 22 and an opening 23 which extends through the top of the cope. rfhe side walls of the recess are tapered and the side walls of the opening are substantially straight. A sand plug is adapted to be inserted inthe recess from the inner side of the. cope and it is shaped to fit snugly in the recess. The sand plug is provided with a recess 29 to form the attaching lug of the brake shoe and this recess is suitably shaped to receive the steel lug 26y and the sand core 28 and to provide for the hot metal to run up about the lug for embedding itl with .the body of the shoe toform the attaching lug. The

reinforcing back 27 is also engaged with the lug 26 and this back and lug and sand core are held in place against theplug and with the reinforcing back against the top wall of the mold cavity by wires 3() which engage the parts to be embedded in the shoe and pass up through the sand plug and are engaged with a cross bar 31 extending `across the opening 23 in the cope. In practice it is convenient to assemble the reinforcing back, the core and the lug with the .sand plug as a unit and then arrange them in their proper position in the mold, as shown in Fig. 1, after which the wires may be engaged with the cross bar 31. The wires may be passed through the sand plug before or after the Lunit is inserted in the mold. The sand plug is of suliicient size to permit the attaching lug of the shoe to be cast therein. After the sand plug and its associated parts have been secured in the cope y'the latter may be arranged in operative position on the drag and the mold is then ready for pouring. The gases produced during the casting operation are permitted to escape through the sand plug andthe open- While it is customary to provide a baked sand core for forming the opening in the attaching lug of the shoe, and While I con-V form texture throughout the bodyV of the shoe. rlhe mold comprises a drag 10a, and a cope 11a. A pouring gate 12et is shown located at one end of the mold and the mold has a mold cavity 13 formed therein.

.This mold is adapted to produce a shoe of substantially the same shapeas that produced by the mold shown in Figs. land 2. rihe cope 11a is adapted to receive a steel attaching lug 26, a steel reinforcing back 27 and a sand core 28, these parts being identical With the similarly designated parts of Figs. 1 and 2. rlhe mold shown in F ig. 3 is also provided/with a porous plug 211 seated ina recess 22 formed in the cope 11, the porous plugv2f1- being identical With the porous plug 24 of VFigs. 1 and 2. And Wire loops 30 suspended from a bar 81 are also employed in the mold of Fig. 3 to securethe reinforcing unit and the porous plug 24; in their proper positions in the cope member 11a. However, the mold of Fig. 3 differs from the mold 0f Figs. 1 and 2 in that the Walls of the mold cavity vlL are formed entirely of refractory sections forming parts of the mold, together With the porous plug 211 invvhich the attaching lug is formed. rlhe cope member 10a is provided With a-refractory section 2Oa Which forms the bottom Wall 15a the end Wall 17, and the side Walls 18a and 19 (not shovvn) of the mold cavity 13a.

The cope member 11a is provided With refractory sections 21a and 21h. The refractory section 21a forms a portion of the top Wall 141-a of the mold cavity 13a, and the refractory section 21"y forms another portion of the top Wall 14a and also forms the end Wall 16il of the cavity. rlhis construction prevents the hot metal from com- VingY into contact With the metal of the mold and the brake shoe produced in the mold is of substantially-uniform texture.

My invention can be employed for making castings other than brake shoes and I consider myself entitled to make all such chang'esin the form, construction and arrangementnof parts as may vbe necessaryv or desirable for this purpose and for making ing a mold cavity therein, said cope havingV a recess communicating with the inold cavity and having an opening communicating with said recess, a porous alug seated in sai recess, and means exten ing through said 4porous plug and through said opening for securing in place in the mold cavity the partsto be embedded in the casting.

2. A permanent mold for making Vcastings, and comprisinga drag and a cope havmold cavity therein, said cope having a recess con'imunicating with the mold cavity and having an opening communicatin with said rec ss, a porous plug seated in sai recess, and Wires embedded in the porous plug for securing in place in the cavity the parts to be embedded in the casting.

8. A periminent mold for making castings, and comprising a drag and a cope having a mold. cavity therein, said cope having a recess communicating with the mold cavity and having an opening communicating With said recess, a porous plug seated in said recess, and means extending through the porons plug for securing in place in thev cavity the parts to be embedded in the casting.

a. fr permanent mold for making castings, and comprising a drag and a cope having a mold cavity therein, said cope having a recess communicating With the mold cavity and having an opening communicatingI with said recess, a porous plug seated in said recess, and means for securing in proper positionsthe porous plug and the parts to be embedded in the casting.

5. A permanent mold for making castings, and comprising a drag and a cope having a mold cavity therein, said cope having a recess communicating with the mold cavity and having an opening communicatin O" with said recess, a porous plug seated in said f said porous plug for securing in the cavity the parts to be embedded in the casting, said supporting` means comprisingv a looped Wire having its legs extending' through said porous plug, and a transverse supporting bar engaging the outer end of the loop. Y

l?. A. permanent mold for making castllt) ings, and comprising a drag and a, cope having a model cavity therein, said cope having a recess communicating with the mold cavity, a porous plug adapted t0 be inserted in said recess from the inner side of the cope and to be seated in said recess and means extending through said porous plug for securing in place in the cavity the parts to be embedded in the cast-ing.

8. A permanent mold for making castings, and comprising a drag and a cope having a mold cavity therein, said cope having a recess communicating with the mold cavity, a porous plug adapted to be inserted in said recess from the inner side of the cope and to be seated in said recess, and common means extending through said porous plug for securing it in the recess and for securing in the cavity the parts to be embedded in the casting.

9. A mold for casting a brake shoe, and comprising a drag and a cope having a mold cavity therein, said cope having a recess therein communicating With the mold cavt ity, a porous plug adapted to be inserted in said recess from the inner side of the cope and to be seated in said recess, said porous plug having a recess therein adapted to receive a relatively non-porous core for forming the opening in the attaching lug of the shoe, and common means extending through said porous plug for securing it in said recess in the cope and for securing in said recess in the porous plug a part to be embedded in the shoe castin 10. A mold for casting a brake shoe, and comprising a drag and a cope having a mold cavity therein, said cope having a recess therein communicating with the mold cavity, a porous `plug adapted to be inserted in said recess from the inner side of the cope and to be seated in said recess, said porous plug having a recess therein adapted to receive a relatively non-porous core for forming the opening in the attaching lug of the shoe, and means extending through said porous plug for securing in place the parts to be embedded in the shoe casting.

11. A mold for casting -abrake shoe, and comprising a drag and a cope having a mold cavity therein, said cope having a recess therein communicating with the mold cavity and having an opening communicating with said recess, a porous plug adapted to be inserted in said recess from the inner side of the cope and to be seated in said recess, said porous plug having a recess therein adapted to receive a core for forming the opening in the attaching lug of the shoe and common means extending through said plug for securing it in said recess in the cope, for securing said core in the recess in the plug and for securing in the cavity the parts to be embedded in the shoe casting.

12. A permanent mold for making castings, and comprising a drag and a co e having a mold cavity therein, saidcope aving a tapered recess communicating with the mold cavity and an opening extendin from said recess tothe top of the cope, an a tapered porous plug adapted to be inserted in said recess from the inner Side of the cope.

JAMES S. THOMPSON.

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