US1484422A

US1484422A - James s

Info

Publication number: US1484422A
Authority: US
Publication date: 1924-02-19
Anticipated expiration: 1941-02-19

Description

Patented Feb. 19, 1924.

UNITED STATES JAMES S. THOMPSON, OF PELHAM, NEW YORK.

BRAKE-SHOE MOLD.

Application filed July 20, 1923. Serial No. 652,770.

To all 'whom t may 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 'Yorin have invented certain new and useful Improvements in Brake- Shoe Molds, of which the following is a specification.

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

A further object of the invention is to enable a brake shoe to be cast in a metal mold freed from the chilling effect which would result by contact of the hot metal with the metal walls of the mold cavity.

A further object of the invention is to provide the mold cavity walls of a metal mold with a refractory facing in a simple and economical manner to enable the production of brake shoes in metal molds with a substantially uniform texture throughout the body of the shoe.

In the accompanying drawings illustrating selected embodiments of the invention Fig. 1 is a longitudinal sectional view showing a metal mold body for making a brake shoe.

Fig. 2 is a transverse sectional view on line 2 2 of Fig. 1.

Fig. 3 is a view similar to Fig. 1 showing the mold cavity walls provided with a refractory coating,

Fig. 4 is a transverse sectional view on the line 4 4 of Fig. 3.

Referring to the drawings, 5 represents the drag and 6 the cope of a metal mold having a pouring gate 7 preferably located at one end. The brake shoe mold cavity 8 is formed principally in the drag, and it has an end wall 9, a bottom wall 10 and side walls 11,V 11 for the end7 wearing face and sides of the shoe. The cope is shaped complementary to the drag and has a wall 12 forming the' top wall of the mold cavity and an end wall 13 forming the other end wall of the mold cavity. This mold cavity thus formed in the drag and cope will be shaped, of course, to produce the type of yshoe desired, and to this end it may be changed as required. These walls of the mold cavity comprise sections of refractory material which are suitably set in the metal drag and metal cope, and the sections are sufficiently substantial to prevent the metal drag and the metal cope from having a chilling effect upon the hot metal poured into the'mold cavity to form the body of the shoe. In Figs. 1 and 2 the refractory material is shown to comprise a channel section 14 seated in the drag and providing the entire bottom wall 10 of the mold cavity. This section 14 has an upstanding end 15 providing the end wall 9 of the mold cavity. The section 14 is also provided with

upstanding sides

16, 16, providing the side walls 11, 1 1 of the mold cavity. I prefer to make this entire refractory section 14 with its upstanding end 15 and

sides

16, 16 in one piece, because joints are thereby avoided and a better casting is produced, but there may be conditions under which this section, as well as other refractory sections, may be made up of several parts and closely fitted or cemented together, and I propose to make the refractory material in this way whenever found desirable.

Refractory sections 17 and 18 are seated in the metal cope of the mold and extend from an opening 19 in the cope oppositely to provide parts of the top wall 12 of the mold cavity, and the section 18 has a depending end 20 providing the end wall 13 of the mold cavity. The refractory sections 17, 18 are suitably shaped at 21 to form end stops at the back of the shoe.

The opening 19 in the `cope is of substantial size to receive a sand plug 22, which is preferably made in a holder or container 23, which fits snugly in the opening 19. I provide the plug with one or more looped wires 24 supported from a cross bar 25 at the top of the plug, and having their free ends projecting through the inner end of the plug. A steel lug 26, baked sand core 27 and a reinforcing back 28 are assembled as shown, and the lug and core are inserted in the sand plug with the back in its proper position against the top wall 12 of the mold cavity, and then the ends of the wires 24 are twisted together beneath the reinforcing back to secure the back in place in the mold cavity and the lug and baked core in the plug. I have r better shown two looped Wires 2li suspended from a flat cross bar 25, Which rests upon the top of the plug including its holder, but these Wires may be differently arranged and supported, as found desirable, to better'satisfy different conditions which may arise in casting shoes of other types or with different reinforcing backs or diderent lugs.

Instead of employing the refractory sections 14, 17, 18 as shown in Figs. 1 and 2, lf may provide the Walls of the mold cavity in the metal dragand cope with a coating ofrefractory material in sections-29, 30 and 31, so that all those portions of the mold cavity Walls formed by the sections 14, 17 and 18v in Figs. 1 and 2 are formed by the

coating sections

29, 30 and 31 in Figs. 3 and d. The construction of Figs. 1 and 2 has the advantage of longer life over the construction of Figs. 3 and Li, but l believe that except for this the construction of Figs. 3 and livvill produce equally good results as that oflligs;v 1 and@ My invention provides in a simple Way for' the manufacture of--bralre shoes in permanent molds of as good or better quality than correspond-ing. brake shoes made in sand molds, at much greater speed and at much less cost; The refractory Walls of the mold cavi-ty prevent the metal drag and the'metalcope from chilling the hot metal poured into'the mold cavity, and they enable the uniform production of brake shoes ofA a predetermined texture at all times, and of a Auality, l believe', than can be produced under corresponding. conditions in a sand mold. The sand plugv 22 permits the escape of gases therethrough during the casting operation, and insures the production of shoes of uniforr'nV size; shape and texture, free from deformations and blovvholes. ll prefer to make this sand plug of relatively large sizev because it can be easily handled, it provides ample space to accommodate the lug and the baked sand core, and it provides for a free escape of the gases. It Will be noted that except'for that partof the top Wall of the mold cavity which is formed by thel sand core and the parts carried' thereby", allI the Walls of the mold* cavity are formedof refractory material, and therefore the shoe casting is (protected throughout by refractory material or its equivalent from the chilling effect which would result by Adirect contact with the meta-l drag and the metal cope. This enables: me to produce a bralr'eshoe of superior texture and" quality under lconditions Which will greatly reducek thel cost 4of manufacture;

My invention can be employed for malring castings other than brake slices and 1 consider myself entitled to malte all such changes in the formg.- constructionand ar'- rangementof'vparts as mayl befne'cessary or desirable" for this purpesey and for making neeaaaa diderent kinds, shapes and sizes of brake shoes, which fairly -fall Within the scope of the following claims.

I claim:

1. A permanent mold for making castings, and comprising a metal dragand a metal cope with a mold cavity formed therein, the cope having an opening communicating with the mold cavity, a sand plug seated in` said opening and forming a part of the top Wall of the mold cavity, and sections of refractory material seated in the drag and in the cope and forming the remaining parts of the Walls of the mold cavity.

2. A permanent mold for making castings, and comprising a metal drag and a metal cope With a mold cavity formed therein, the cope having an opening communicating With the mold cavity, a sand plugseated in said opening and forming a part of the top Wall of the mold cavity, sections of refractory material forming theVv remainder of thetop Wall and one end Wall of the mold cavity, and a channel section of refractory material'forming the bottom Wall and the sidevv'allsand the other end Wall of the mold cavity.

8. A permanent mold for making castings, and comprising a metal drag and a metal cope with a` mold cavity formed therein, the cope having a central opening communicating With the mold cavity, a sand plug seated in said opening and forming a part of the top Wall of the mold cavity, a single sectionofrefractory material forming the'bottom Wall, side Walls and oneend Wall of the mold cavity, another section of refractory' material forming the other end Wall and extending tol the opening in the cope to form a part of the top Wall of the mold cavity, and another section of refractory material extending from the opening in the cope to the first mentioned end Wall to form the remaining part of the top` Wall of the mold cavity.

et. A permanent mold for casting a brake shoe, and comprising a drag and a cope having a mold cavity therein, and an integral section of refractory material forming the bottom Wall of said mold cavity and eX- tending from end to end thereof.

5. A. permanent mold for casting a brake slice, and comprising a drag and a cope having a mold cavity therein, and an integral section of refractory material forming the bottom and side walls of said mold cavity and extending from end to end thereof.

6. A permanent mold for casting a brake shoe, and comprising a drag ancha cope having a mold cavity therein, and an integral section of'refractory material forming the bottomv and one end Wall of said mold cavity.

7. A permanent mold for casting a brake shoe, and comprising a drag and acope having, a mold cavitrtherein, integrai section of refractory material forming the g shoe, and comprising a drag and a cope having a mold cavity therein, and an integral section of refractory material seated in the drag and forming the bottom, sides and one end Wall of said mold cavity.

9. A permanent mold for casting a brake shoe and comprising a drag and a cope having a mold cavity therein, and an integral section of refractory material Jforming the bottom wall of said mold cavity and extending from end to end thereof, said cope having an opening therein and a sand plug in said opening.

JAMES S. THOMPSON.