US1484428A - Brake-shoe mold - Google Patents

Description

Feb., -119 E924.

J. S. THOMPSON BRAKE SHOE MOLD 1925 3 Sheets-Sheet l Filed yJuly 20 Feb. 319 i924.,

J. S. THOMPSON BRAKE SHOE MOLD Filed July 20, 1923 3 Sheecs-Sheet 2 1 I l l I "A l I 1 lfaO-,f

' @y Wa d@ Feb, 19 R924.,

J. S. THOMPSON BRAKE SHOE MOLD Filed July 20, 1925 I5 Sheets-Sheet 5 ames rieb. i, ieee.

.TES S. THOMPSON, OIF PELHAM, NEW YORK.

BRAKE-SHOE MOLD.

Application le-d July 20,

To all whom t may concern:

Be it known that 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 Molds, of which the following is a specification. This invention relates tothe manufacture ofbrake shoes, and more particularly to the mold in which the shoe is cast, and its object is broadly to enable a brake shoe to be cast in a permanent mold fully as well as it can be cast in a sand mold, and with the additional advaritages of reduction in time and labor.

A further object of my invention is to provide a permanent mold which is adapted to receive and hold in position a reinforcing part or p-arts which are to be embedded in the shoe casting; which can be easily and quickly opened and closed to permit insertion of the reinforcing part or parts, and to permit removal of the shoe; which has an advantageously disposed sand plug for permitting the gases to escape from the mold cavity durino the casting operation, and which has refractory sections for protecting certain parts of the shoe casting from the chillin effect which would result by contact of the ot metal with the metal walls of the mold cavity.

Other objects of m invention will become apparent as the detai description progresses, reference being had to the accompanying drawings which illustrate a selected embodiment of the invention, and wherein- Fig. 1 is a transverse sectional view on the line 1-1 of Fig. 2.

Fig. 2 is a lon itudinal sectional view on the line 2-2 of ig. 1.

Fig. 3 is a horizontal sectional view on the line 3 3 of Fig. 2.

Fig. 4 is a transverse sectional view taken on the same line as Fig. 1, a sand plug and a reinforcing unit shown in Fig. 1 having been omitted to better illustrate certain details of construction of the mold.

Fig. 5 is a plan View of the mold as it appears when it has been opened and cleaned after a casting operation.

Fig. 6 is a perspective of a fragmentary portion of a refractory section which forms a part of one of the cope members of my improved mold.

Fig. 7 is a perspective of a fragmentary 1923. Serial No. 652,776.

portion of a refractory section which forms a part of the other cope members of my improved mold, and Fig. 8 is a perspective view of a reinforcing unit together with a core which is adapted to support or suspend the reinforc- 1ng unit in the mold cavity and which is adapted to form the opening in the attachin lug.

n the drawings, the reference character 10 designates the relatively fixed drag member of my improved mold, the mold also comprising two cope members 11 and 12 having a mold cavity 13 therein. The drag member 10 is provided with outstandin side lugs 14 which are pivotally connecte by means of pivoting bars 15 to outstanding side lugs 1G on the cope members 11 and 12. Each of the cope members has a part of the mold cavity formed therein, the parting line between the cope members extending longitudinally of the mold and substantially central of the mold cavity. This construction enables the mold to be quickly and easily opened and closed and it also enables the parts which are to be embedded in the shoe casting to be arranged in the mold and held therein in proper positions. The cope members may be brought into the positions indicated by dotted lines in Fig. 4 and indicated by full lines in Fig. 5. As hereinafter more fully set forth, the cope members may be closed without injury to and without disarranging the parts -to be embedded in the shoe casting, and they may be opened for the removal of the shoe casting without damage to any parts of the mold. Tn addition to accomplishing these results in a very simple manner in this invention, whereby brake shoes can be made with greater perfection than they can be made in sand molds, ll have provided a mold with refractory sections of improved form which are adapted to hold certain portions of the brake shoe to be cast in the mold free from the chilling effect which would result by contact of the hot metal with the metal walls of the mold cavity. l prefer to provide certain refractory sections in the cope members with means for supporting the core which forms the opening in the attaching lug so that this core may be lemployed. to support the parts which are to be embedded in the shoe casting. also prefer to rovide a centrally disposed sand plug whic will form part' of the mold cavity wall formed in each of the cope members 11 and 12, the sand plug affording means whereby the gases may escape from the mold cavity during the casting operation. The advantage of this construction will become apparent as this description proceeds.

As shown in Figs. 4 and 5, each of lthe` co e members 11 and 12 is provided with a fre ractory section, the refractory sections being designated by the reference characters 17 and 18 respectivel The refractory section 17 forms the side Wall 19 of the mold cavity 13 and the refractory section 18 forms the side Wall 2O of the mold cavity. And each of the refractory sections forms part of the top wall 21 and the end Walls 22 and 23 of the mold cavity. The bottom Wall 24 of the mold cavity is partially formed by the metal of the drag member 10 and partially by the refractory section 25 carried by the drag member. .It will be noted that the refractory section 25 is centrally disposed with respect to the mold cavity and that it does not extend to the end Walls 22 and 23 of the cavity. It will also be noted that the portions of the refractory sections 17 and 18 which form parts of the end Walls 22 and 23 of the mold cavity are not extended to meet the bottom Wall 24 of the cavity. The purpose of this construction is to permit the hot metal to come into contact with the metal of the mold at and adjacent the end of the bottom wall 24 of the mold cavity so that a brake shoe having an integral composite Wearing face may be cast in the mold. It Will be readily understood that this integral composite wearing face is obtained by protecting certain portions of the shoe from the chilling effect of the metal of the mold, and by permitting other portions of the shoe to be affected by the chillingactiou of the metal mold. The shoe produced by the mold shown and described would have .L composite Wearing face having chilled end portions and an intermediate unchilled soft iron portion. However, the several refrac-' tory sections could, if desired, be made to form substantially the entire Walls of the mold ,cavity to permit a brake shoe to be cast having a substantially uniform`texture throughout the body of the shoe.

It is customary to embed a steel attaching lug 26 and a steel reinforcing back 27 in the shoe casting, and it is also customary to provide a sand core 28 for forming the opening in the attaching lug. In the embodiment of my invention, which I have shown in the accompanying drawings, each of the refractory sections 17 and 18 is recessed lo receive a portion of the sand core 28. The recess in the refractory section 17 is designated by the reference character 29 and the recess in the refractory section 18 is designated by the reference character 30. The

recess 29 is shaped to provide a pair nf shoulders 31 which co-operate 'with shoulders 32 formed upon corner extensions 33 of the sand core 28 to hold and support the core in the mold While the mold is being closed and during the casting operation. As shown in Fig. 8, I preferably employ the sand core 28 as means for supporting or suspending the steel back 27 in its proper position in the mold cavity. To accomplish this, I have found it advantaffeous to secure the steel back to the core by Wire ties 34. The steel attaching lug 26 may then be held in its proper position with respect to the steel back 27 by said core 28. This method of assembling the steel back and steel attaching lug is advantageous in that these parts may be handled as a unit by the skllled operator with a resultant saving of his time and labor. So that the cope member 12 may be closed Without injury to the core 28, it is preferable to make the upper part 35 of each end Wall of the recess 30 incline reversely to the adjacent inclined end Wall 36 of the recess 29 in the cope member 11, and also to revcrsely incline the adjacent upper quarters 37 of the end of the core to the inclination ofthe end surfaces 38 of the extensions 33 formed upon the core. The effect of this is to cut away the upper corners of that portion of the core which enters the recess 30 in the cope member 12. The core is made to fit in the recess 29 in the cope member 11, and the recess 30 in the cope member 12 is made to fit on that portion of the core With which it engages, the construction being such that the core may be inserted in the cope member 11 when the latter is in open position. The cope member 1l can then be closed without dislodging or disarranging the core or the lug 26 and steel back 27 carried by the core and after the cope member 11 has been brought to its closed position with the core 28, lug 26 and steel back 27 in proper positions, the cope member 12 may be closed Without, damaging or disarranging the core. This enables the mold to be quickly and easily prepared for the casting operation and also insures that the parts to be embedded in the shoe will be properly disposed therein, And this feature permits the mold to be opened and the casting removed without damage to any part of the mold.

Another feature of my invention is a centrally disposed sand plug 40 which is preferably made in a holder or container 41 and which is particularly adapted to be employed in connection With a mold having the features I have described hereinbefore, the sand plug providing means whereby gases may escape from the mold cavity 13 during the casting operation. The holder 41 is designed to seat itself in an opening 42 provided in the cope members 11 and 12, a part of the raeaaas opening 42 being formed in the co e member 11 and another part of the opening 42 being formed in the co e member 12. Each of the refractory sections 17 and 18 is provided with an aperture which communicates with the opening 42 and with the mold cavity 13. These apertures in the refractory sections 17 and 18 are designated by the reference characters 43 and 44 respectively. This construction is illustrated clearly in Figs. 6 and 7 in which figures the forwardly projecting ends of the refractory sections have been broken away to illustrate clearly the manner in which the recesses 29 and 30 are formed in their respective refractory sections 17 and 18, and the manner in which the apertures 43 and 44 are arranged so that they may communicate with the opening 42 formed in the cope members, and with the mold cavity 13 also formed in the cope members. These figures, together with Figures 4 and 5, also show the manner in which the rear walls 45 and 46 of the recesses 29 and 30 respectively are cut away to accommodate the attaching lug 36. This arrangement of the apertures 43 and 44 with respect to the recesses 29 and 30 and cut-away walls 45 and 46 permits the sand plug 40 to be made with two downwardly extending portions or legs 47 which reach into the apertures 43 and 44 and form a portion of the mold cavity wall on each of the cope members 11 and 12 (Fig. 1). The advantage of disposing the sand plug at this point of the mold is obvious. During a casting operation, the gases released in the mold cavity tend to form a gas pocket in the upper portion of that part of the mold cavity wherein the attaching lug is disposed. The sand plug 40 permits the gases to escape and because of its novel form obviates the necessity of employing a plurality of plugs.

This invention provides a permanent mold in which a brake shoe may be cast fully as well as it can be cast in a sand mold. and in less time. When the shoe casting is to be removed from the mold. the cope members are thrown to open position, which action, of course, positions them for reception of the parts to be embedded in the shoe during the casting operation. The mold can be closed without the exercise of special skill or any considerable amount of labor. The two cope members are held in closed position by clamps 50 which also serve to hold the two cope members rigid with the drag member. T have indicated a pouring gate at 51, the lower end of the pouring gate registering with an opening in the steel back 27.

My invention can be employed for making castings other than brake shoes and T consider myself entitled to make all such changes in the form, construction and arrangement of part-s as may be necessary or desirable for this purpose, and for making different kinds,

2. A permanent mold for casting a brake shoe, comprising a drag and a two-member cope, each of said cope members having a part of the mold cavity therein and having means for supporting the core which forms the opening in the attaching lug of the shoe, and a sand plug having spaced portions of its surface forming portions of the mold cavity walls formed in said cope members.

3. A permanent mold for making castings, comprising a drag and a two-member cope, each of said cope members having a part of the mold cavity therein and having a refractory section forming a portion of the mold cavity wall formed thereon, one of said refractory sections being adapted to hold in proper position the parts which are to be embedded in the casting, and a sand plughaving spaced portions of its surface orming portions of the mold cavity walls of said cope members.

4. A permanent mold for making castings, comprising a drag and a two-member cope, said cope members being hinged on the drag to swing outwardly thereon, each of said cope members having a part of the mold cavity therein and having a refractory section forming a portion of the mold cavity wall formed thereon. each refractory section being adapted to hold in proper position the parts which are to be embedded in the casting, and a sand plug having spaced portions of its surface forming portions of the mold cavity walls of said cope members.

5. A permanent. mold for making castings, comprising a drag and a two-member cope, said cope members being hinged on the drag to swing outwardly thereon.l each of said cope members having a part of the mold cavity therein and having a refractory section forming a portion of the mold cavity wall formed thereon, each refractory section being adapted to hold in proper position the parts which are to be embedded in the casting, and a centrally disposed sand plug forming a portion of the mold cavity wall of each of said cope members.

6. A permanent mold for making castings, comprising a drag and a two-member cope, said cope members being hinged on the drag to swing outwardly thereon, each of liti said'cope members having a part of the mold cavity therein and having a refractory section forming a portion of the mold cavity wall formed thereon, each refractory section being adapted to hold 1n proper position the arts which are to be embedded in the castlng and being provided wlth an aperture extending therethrough and c0mmunicating with the mold cavity, and a sand plug having portions thereof disposed 1n said apertures to form portions of the mold cavity Walls formed in the cope members.

7. A permanent mold for casting a brake shoe, comprising a drag and a two-member cope, said cope members being hinged on the drag to swing outwardly thereon, each of said cope" members having a part of the mold cavity therein and having a refractory section forming a portion of the mold cavity Wall formed thereon, each refractory section having shoulders adapted to support the core for forming the opening in the attaching lug of the shoe, and a sand plug having spaced portions of its surface forining portions of the mold cavity Walls of said cope members.

8. The combination with a core for forining the opening in the attaching lug of a brake shoe and having extensions thereon, of a permanent mold for casting the brake shoe and comprising a drag and a twomember cope having a mold cavity therein, each of said cope members having a recess to accommodate a portion of the core and one of said cope members having shoulders formed thereon to co-operate With the extensions on thecore to hold the core in said cope member While the cope is being closed and during the casting operation, and a sand plug having one portion of its surface forming a part of the mold cavity wall in one cope member and a separate portion of its surface forming a part of the mold cavity wall in the other cope member.

9. The combination with a core for forming the opening in the attaching lug of a brake shoe and having extensions thereon, of a permanent mold for casting the brake shoe and comprising a drag and a twomember cope having a mold cavity therein, each of said cope members having a recessed refractory section adapted to accommodate a portion of the core and one of said refractory sections having shoulders formed thereon to cooperate with the extensions on the core to hold the core in proper position with respect to said refractory section during the casting operation, and a sand plug havinur one portion of its surface forming a part o the mold cavity Wall in one cope member and a separate portion of its surface forming a part of the mold cavity Wall in the other cope member.

10. A permanent mold for making castings, comprising a drag and a two-member cope, each of said cope members having a part of the mold cavity therein, and a centrally disposed sand plug having spaced portions of its surface forming portions of the mold cavity Walls of said cope members.

JAMES S. THOMPSON.

Images