US1484436A - Brake-shoe mold - Google Patents

Description

Feb, l9 1&924a 11,484,436

J. s. THOMPSON BRAKE SHOE MOLD Feb., i9 192% J. S. THDMPSQN BRAKE SHOE MOLD Filed Aug. 1, 1925 resetear ree. te. ieee.

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l` S'ETE JAMES S. THOMPSON, OF PELI-AM, NEW YORK.

BRAKE-snor. MOLD.

Application filed August 1, 1923. Serial No. 655,066.

VT all whom t mayV concern.'

Be it known that I, JAMES S. THOMPSON,

a citizen of the United States, residing at Pelham, in the county of Westchester and State of New York, have invented certain new and useful Improvements in Brake- Shoe hfolds, of which the following is a specification.

This invention relates to the manufacture l0 of brake shoes and more particularly to the mold inV which the shoe is cast, and its object is-broadly to enable a brake shoe to be cast in a permanent mold, as wellV as it can be cast in a sand mold, and with an additional advantage of reduction in time and cost.

Another object of the invention is to provide a simple means for supporting in the mold the core which is employed for forming the opening in the attaching lug` of the shoe.

And another object of the invention is to enable a unit comprising an assembly of the lug, the core therefor and the reinforcing back to be easily and quickly inserted in the mold.

Other obj ects of my invention will become apparent as the detail description progresses, reference being had to the accompanying drawings which illustrate aselected embodi-V ment of the invention, and wherein- Fig. 1 is a central transverse section taken through the mold.

Fig. 2 is a central longitudinal sect-ionv through the mold taken on line 2 2 of Fig. 1.

Fig. 3 is a horizontal section taken on line 3-3 of Fig. 2. v

Figs. tand 5 are perspective viewsof certain refractory sections forming parts of Ythe mold, and

Fig. 6 is a perspective view of the steel reinforcing back. attaching lug and the core forforming the opening through the attach ing lug, the several parts being assembled as a unit.

Referring to the drawings, the Vmold comprises, a metal drag 10 and a metal cope having two members 11 and 12. A suitable mold cavity for making the desired casting is provided in the mold, partly .in the drag and partly in the cope. VThe cope members have side lugs 14, andpivot rods 15V engage these lugs and` corresponding lugs on the drag for pivotally connecting the cope me bers to the drag. A pair of clamps 17 may be provided for securing the cope members in closed position and the pouring gate 18 may be arranged as shown to register with an opening in the reinforcing back 19, which is embedded in the brake shoe casting. The lug '2O and the sand core 21 therefor are preferably assembled as a unit with the reinforcing back 19 and secured together by means of the wire ties 22 so that these parts may be easily handled and inserted as a unit in the mold for the casting operation. The parting line between the two members of the cope is offset to provide a projection 23 upon the member 11 and a complementary recess 211 in the member 12, and this construction is provided so that the aforesaid unit can lbe inserted in one member of the cope and both members of the cope swung to closed position without damaging or disarranging the unit or any part thereof. A. recess 25 formed in the projection 23 is adapted to receive the sand core 21 and it is provided with inclined end surfaces 26 adapted to engage inclined end surfaces 27 of the sandcore so that when the sand core is inserted in the recess 25 from the parting line surface of the projection 23, the core will be held against displacement in a direction toward the mold cavity 13. The recess 25 is preferably designed to receive the entire sand core 21 and for that reason it is preferably of a depth substantially equal to the width of the core. lt will be noted that the recess 25 is formed in a refractory section 28 forming part of the cope member 11. It will also be noted that the cope member 12 is provided with a refractory section 2S) and that the drag member 1() is provided with a refractory section 30. These refractory sections are provided to protect the hot metal from the chilling effect of the metal. of the mold.

When the mold is to be prepared for the casting; operation. the operator first brings the cope members 11 and 12 into the posh tions shown by dotted lines in Fig. 1. The reinforcing back 19, the attaching-,lug 20. and the sand core 21 may then be placed in the cope member 11 as a unit. The entire sand core 21 will 'be received within the recess 25 and the attachinglug and steel lback will be properly positioned in that portion of the mold cavity which is formed in the cope member 1l. The cope members are then closed and secured by the clamp 17. The inclined surfaces 27 of the core 2l will engage the inclined surfaces 2G of the recess 25 and prevent the core from falling into the mold cavity. The steel back and the attaching lugwill, of course, be supported in proper position by the core. As the core is received in its entirety Within the recess 25 in cope member ll, it can not be injuredby the latter when the cope member l2 is brought to the closed position. In addition toV permitting the mold to-be closed Without disarranging the parts to be embedded in the shoe casting my invention permits the mold to be opened for removal of the shoe casting Without injury to any part of the mold. After the cope members have been brought to their closed positionand secured therein by means of the clamps 17, the mold is ready for the casting operation,V a plurality of sand vents 32 being provided in the cope members to permit gases to escape from the mold cavity during the casting operation.

VAs hereinbefore set forth, the drag inem ber l() and ythe cope members il and 12 are provided with refractory sections which are Vadapted to protect the hot metalintroduced into the mold from the chilling` effect of the metal of the mold. The refractory sections 28, 29 and 30 form substantially all of each of the Walls of the mold cavity 13, thus enabling the mold to produce a brake shoe of substantially uniform texture. lloivever, in the event that lbrake shoes were desired having integral compositeV Wearingfaces, the refractory sections could be modified so as to alloiv the metal of the mold to chill the end port-ions of the shoe casting.

I am aware that changes in the form, construction and arrangement of parts may be made without departing from the spirit and Without sacrificing the advantage of the invention and I consider myself entitled to make all such changes as fairly fall within the scope of the following` claims.

I claiml. VThe combination with a core for forming the opening in the attaching lug` of a brake shoe. of a permanent mold for casting the brake shoe and comprising a drag and a tivo-inenibercope having a mold cavity therein, each of said cope members hai ing a part of the mold cavityztherein, and

one ofvsaid cope members having a recess adapted to receive the entire core.

2. The combination with a core for forming the opening .in the attaching lug of a itytherein, each of said. cope members having a part of the mold cavity therein and .oneof said cope members havinga recess .-shaped to engageandvtofhold.the core in place, the recess' being adapte-d to receive the entire core. Y p 'llie combination with a core for forming the opening in the attaching lug of a brake shoe, of a permanent mold for casting the brake shoe and comprising a drag and a tivo-member clope having a mold cavity therein, each of said copemem'bers having a part of the mold cavity therein and one of said cope members having a recess adapted to receive the core, the recess being of a depth substantially equal to Athe Width of the core. l y

4. The combination with a core for ornr ing the opening in the attaching lug of a brake shoei of a permanent mold 'for cast# ing the bre-ke shoe and comprising. a drag and a tivo=member cope havingamold cavity therein, each of said cope members having a recess wherein the core may be seated, the recess being of asdepth substantially equal to the Width of the core, and means for securing to the core the parts which are to be embedded in the shoe casting.

5. The combination Witha core for form- -ing the opening rin the attaching lug of a brake sho-e, of a permanent mold for casting the b `alie shoe and comprising a drag and a 'two-memberV cope -having a mold cavity therein, said cope members being hinged. on the drag member to swing outwardly thereon, each of said cope members having a part of the mold cavity thereinV and one of said cope members having a recess adapted to receive the entire core.

6. The combination With a core for forming ythe opening in the attachingnlug of a brake shoe, of a permanent mold for casting the brake shoe and comprising a drag and a tivo-.member cope having a mold. cavi ity therein, said cope members being hinged on the drag member to swing outwardly thereon, each of said cope membershaving a part of the Vmold cavity therein and one of said cope members having Ya recess adapted to receive and to hold the core in place, the recess being of a depth substantially equal to the Width of the core.

7. The combination With 'a core for forming the openizngin the attaching lug of a bake shoe, of a permanentV mold Vfor casting the brake shoe and comprising a drag and a tivo-member cope having a inold cavlity therein, said copemembers.beinghinged on the drag member to swing outwardly thereon., each of said cope members having a part ofthemold cavity therein, and one of said cope membershavinga recess. adapted to receive and to holdthe core inplace, the recess being of. ay depth substantially vequal tothe Width of the core and .means .for securing to thecore `the parts `which are to'be embedded in the shoecasting.

8. The combination with acore .foriform- .ing the opening in the .attaching lug lof a 1 ,Lie/inse brake shoe, of ay permanent mold for cas ing the brake shoe and comprising a drag and a two-member cope having a mold Cavity therein, each of said Cope members having a pai-t of the mold cavity therein and one of said Cope members having a recess communicating with the parting line between the cope members, the recess being adapted to receive and hold the core in a position wherein one surface of the core is 10 substantially flush with the parting line between the cope members.

JAMES S. THOMPSON.

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