US1707492A - Mold - Google Patents

Description

April 2, 1929. c, D, P -n5 1,707,492

MOLD

Filed Sept. 5, 1926 4 Sheets-Sheet l INV'ENTOR 9. Fun L.

) ha it 11PM.

- April 2, 1929, CD, FEW 1,707,492

' u o n Filed Sept. 5. 1926 4 Sheets-Sheet 2 4 /8a 18 4' l6 3 1151 a 5 4 INVENTOR April 2, 1929. g, P -r15 1,707,492

' MOLD Filed Sept. 5, 1926 4 Sheets-Sheet 4 I v l i 20a.

Patented Apr. Z, 1929.

UNITED STATES PATENT OFFICE.

CLIFTON D. PET'IIS, OF NEW YORK, N. Y.

MOLD.

Application filed September 3, 1926. Serial No. 133,337.

The present invention relates broadly to the art of metal founding, and more particularly to molds of the so called permanent or repetition type. For purposes of illustration, there is herein disclosed a repetition 1 or the character of the casting produced therein.

It has heretofore been proposed to construct repetition molds of a plurality of relatively movable members openable at will by an operator, to permit the removal of a finished casting, and closable prior to the casting operation to bring the parts into position to form a molding cavity. Not infrequently, with structures of this type, however, while effective for the rapid production of castings, difliculty has been experienced in insuring proper registration or coopera-- tion of the respective parts, and particularly I where a movable or separable'top closure member has been employed. Due to the temperature of the various parts after the mold has been in use for a short time, some difliculty is experienced in the handling of the parts to overcome such difiiculties.

The present invention has for one of its objects the provision of an improved mold of the general nature herein set forth having means for efi'ectively cooperating with a preformed metallic plate or other shape adapted as to become incorporated in or constitute part dental opening movement.

reversal of certain of the parts is made possible to thereby more nearly equalize wear on the mold parts, or to more nearly equalize temperature conditions should such an operation be deemed advisable.

In my Patent No. 1,542,637, of June 16, 1925, there is disclosed and claimed a mold v of the general type herein contemplated but differing materially herefrom in the construction and operation of the top clos-ure, m the manner of maintaining a reinforcing or shell member in position and in the gen eral structural relationship of the mold parts. In accordance with the resent invention, the top closure is preferably secured to the rest of the mold structure, as for example by pivotal mounting. By reason thereof, the top closure may be thrown back out of the way for the removal of the casting, and when ready for replacement may be easily handled and moved into closed position with assurance of proper registration with the remaining mold portions.

I further preferably provide locking means for holding the top closure in proper position, these locking means preventing accidental movement thereof during the casting operation. It has not been uncommon practice heretofore in the use of repetition molds to pour the molten metal directly into the molding cavity in such manner as to impinge upon the junction line of two adj acent mold portions. I' have found that while such a'mold produces castings of the required quality, the length of life of the mold, and the general appearance of the castings is improved by pouring the metal initially onto a solid surface, and preferably a surface which is readily renewable or reversible, as required. 1 s

In the accompanyingdrawings, I have shown for purposes of illustration only, certain preferred embodiments of the present invention, it being understood that the drawings do not define the limits of my invention, as changes in the construction and operation disclosed therein may be made without do: parting either from the spirit of the present invention or the scope of my broader claims.

In the drawings:

Figure 1 is a top plan view of a repetition mold;

Figure 2 is a side elevation thereof;

Figure 3 is a vertical section taken on the line III-III of Figure 1; i

Figure 4 is a vertical section taken on the line IV-IV of Figure 3;

Figure 5 is a horizontal section taken on the line VV of Figure 3;

Figure 6 is an end elevation of the top closure structure showing the gate forming portions in closed position;

Figure 7 is a similar view showing the parts in their open position;

Figure 8 is a side elevation of a portion of a modified to. closure member showing the manner of ho ding a reinforcement in place when a core is employed;

Figure 9 is a horizontal section taken on the line IXIX of Figure 8;

Figure 10 is a vertical section through a ynrtion of the apparatus shown in the Figures 8 and 9;

Figure 11 is a perspective view of the modified form of brake shoe produced with the apparatus shown in Figures 8 to 10, and

Figure 12 is a detail top plan view of still another form of core adapted for use in place of that shown in Fig. 10.

In the illustrated embodiment of the invention, there is shown a repetition mold comprising a base 2 having pairs of lugs 3 and 4 formed thereon. The pair of lugs 3 carries a rod 5 on which are pivotally mounted side receptacle members 6, while each pair of lugs a carries a transversely extending rod 7 on which are mounted the end receptacle members 8; The base is also provided with upstanding posts 9.for the locking cams 10, which cams cooperate with projecting arms 11 on the receptacle members as understood in the art, and as clearly indicated in Fig. 4. The locking cams may be provided with suitable operating means in the form of handles 12 by means of which the various receptacles may be moved to open or closed position at the required times and in the proper order.

As best indicated in Fig. 4, the receptacle members 6 are made in theform of open sided channels in which are carried mold blocks 13 forming the mold cavity proper. These blocks may be of suitable composition and of either metal or refractory material. Screws 14 extend through openings in the side receptacles and suitably engage the blocks to hold the same. in position. This structure is extremely simple and has been found desirable in actual practice as it facilitates fitting and assembly of the blocks.

These side receptacles are so formed as to cooperate with an intermediate bridge 15 constructed to form the bottom of the mold cavity and serving as a centering means or stop for the side receptacles during their closing movements. This bridge has a body portion of generally arch shape in longitudinal section, as clearly apparent from Fig. 3, and is preferably shaped at its ends to directly cooperate with the lugs 3 and also with. pads 16 formed on the base adjacent these lugs. The ends of the bridge are also preferably formed with channel shaped openings 5' adapted to slide over the projecting ends of the rod 5 and thereby not only prevent endwise movement of the rod but also to be accurately centered with respect to the rod. The bridge 15 is of symmetrical construction with respect to its opposite ends, whereby it may be reversed end closure member is first swung downwardly into position on the side receptacles (S which are at this time .in open position as indicated in dotted lines in Fig. :t. The side receptacles are moved inwardly against the bridge 15, and the end receptacles then moved to closed po ition. These end receptacles. as clearly indicated in Fig. 5 are recessed as indicated at 19, to receive and cooperate wit-h the projecting ends of the side receptacles and thereby locking same against opening movement. In order to insure proper relationship of the end receptacles with the side receptacles, each recess 19 may have a portion of its sides slightly inclined" to serve as guiding means during the closing movement of the end receptacles. One of the end receptacles is also effective for locking the top closure against upward movement as hereinafter described.

The top closure conveniently comprises a body portion 20 on which are pivotally mounted pouring gate formingportions 21 and 22. The body portion 20 is provided with projecting lugs cooperating with studs 23 secured in the extensions 9 on certain of the posts 9, as indicated in Fig. 2. The gate forming portions 21 and 22 are conveniently pivoted on a stud bolt :24 carried by an upstanding arm on the member 20. This upstandin arm has a vertical face 26 abutting the sides of the gate forming portions, and is preferably otfset intermediate its ends, as clearly indicated in Fig. 3, to facilitate the pouring operation as hereinafter more fully explained.

Each of the gate forming portions has an outwardly extending handle 27 preferably directly threaded into the gate forming portions, as shown in Fig. 1. Each of these portions also conveniently has a slot- 28 cooperating with combined stop and guide lugs 29 projecting from the arm 25. \Vith the portions 21 and 22 in position indicated in Fig. 6. theyform a. pouring gate 30 through which molten metal is introduced into the mold cavity. Due to the offsetting of the'arm 25, the projection of the gate pouring portions over the gate formed thereby is reduced to a minimum, in such manner that additional room is available for the workmen in the pouring of the molten metal.

As best shown in Figures 3 and 6, the gate forming portions are provided with a keyway 31 adapted for engagement by key 32 secured in any desired manner in the cavity forming block of the right hand end receptacle 8 as illustrated in Figure 3. When the top closure member is moved into the position of Figure 3, with the gate forming portions in position to form the gate, the movement of the end rcceptach. at the right of this figure into position will bring the key 32 into engagement with the keyway 31 and prevent any lifting of the top closure. Due to the rctesses 19 on the end receptacles, the movement of the end receptacles also serves to locate the side receptacles against opening movement.

In the cpnstruction of brake shoes it is frequently desirable to incorporate therein a reenforcement. or to form a brake shoe of the shell type. In such cases it is necessary to provide means for effectively holding the reenforcement or the shell in position. I preferably constructthe top closure member in such manner that it will serve this purpose. here a shoe of the shell type is to be. made, there may be conveniently utilized a shell comprising a back 38, as indicated in Figures 3 and 4, having reticulated and preferably inwardly directed side portions 34 which project into the mold cavity and are adapted to become imbedded in the cast metal. Such shells are formed with a suitable center lug 35 projecting upwardly from the back of the shell as clearly shown in the drawings and secured thereto in any desired manner.

The body portion 20 may be formed with an opening 36 to accommodate the center lug 35, the opening preferably being no wider than the shell so that the shell is effective for closing this opening and form ing in itself a portion of the wall in the mold cavity as disclosed in my patent referred to. A hook 37, as indicated in the drawings, is so mounted as to project into the opening 36 and engage the center lug 35. of a. hand lever 38 having a pivotal mounting 39 and cooperating with a spring 40 effective for normally holding the hand lever in the posit-ion indicated in Figure 3. For properly centering the hand lever on its pivotal mounting, there may be provided spacers 39 as clearly shown in Figure 4. The spring 40 will be effective through the hook 237 for raising the shell upwardly into tight engagement with the top closure,

and will also tend to move the shell to the right as viewed in Figure 3 to the extent permitted by the end wall of the opening 36. In this manner each shell is automatically centered and maintained in proper position by the mere act of engaging the hook 37 therewith.

The shell is provided in known manner with an intermediate opening 41 and ad- The book is formed on the lower end jacent each end. thereof with a smaller opening or openings 42. The opening 41 is adapted to register with the pouring gate 30 when the mold parts are in closed position so that molten metal may be poured therethrough directly into the mold cavity and onto the bridge 15. The openings 42 permit the metal to flow outwardly through the shell and form the end stops on the shoe as well understood in-the art. Intern'iediate the openings 42 the metal does not come into contact with the top closure member due to the tight joint formed between the sides thereof and the blocks 13 in the side receptacles. It will be apparent that the movement of the side receptacles to closed position will be effective for automatically centering the shell laterally.

\Vhen the molten metal passes through the gate, it engages directly with the bridge 1;), which, due to its construction, provides a smooth surface for the metal and insures the formation of a finished casting of smooth contour. As the metal rises in the cavity it comes into cont-act with the reticulated sides 34, and in the event the shell is not tightly against the top closure, tends to force the shell upwardly. This constitutes an additional safe guard as will be readilynnderstood. I

After the metal has cooled sutiieiently, the locking cams are operated to first open the end receptacles and thereafter the side reieptacles. The handle 38 is moved to free the hook 37 from the center lug 35. For holding the handle in this position it may be provided with a catch 43 adapted to cooperate with a projection 44 on the arm 25.- The movement of the end receptacles, just referred to, releases the top closure member and the side receptacles, which are then moved to open position, While the movement of the handle 38 entirely frees the casting. This permits the top closure member to be swung about its pivotal mounting by grasping the handles 27 and lifting the same. This results initially in opening the gate forming portions 21 and 22 and moving the same into the position of Figure 7 in which they will clear the gate formed on the casting. The top closure member is then thrown back leaving the casting supported on the bridge 15 from which it may be lifted in known manner, conveniently by suitably en.- gaging the center lug The mold is made ready for a succeeding pour merely by placing another reenforcement in position against the top closure member and engaging it by the hook 37. The top closure member is then swung into position, the side receptacles closed and the end receptacles then moved to closed position to lock both the side receptacles and the top closure.

In Figures 8 to 10 there is illustrated a slightly modified form of holding means and top closure construction, this inodified embodiment being particularly adapted for the formation of a shoe as partially indicated in perspective in Figure 11. Such a shoe comprises a cast body having a reenforcement 4-6 along the back and having side projections forming a center lug ell in connection. with the strip 48. This strip, constituting part of the center lug, has downwardly projecting ends extending around the sides of the reenforcemcnt and under the same. In operation, the reenforecment 4G is placed against the lower face of the top closure 20 which comprises sections 49 held in place by screws 5() and shaped to provide the cavities for the formation of the center lug. Extending through the sections 19 is a pair of holders 51 having laterally projecting feet 52 thereon. These holders are each connected with an arm 53 at their upper ends, which arms are fastened together by an operating handle 5%. lViththe parts in the solid line position of Figure 9, the feet 52 project in. a direction indi rated by the reference letters a. while. with the handle in its dotted line position the feet are directed inwardly one toward the other as indicated by the reference letters I) and also as clearly shown in Figure '10. In this position they project under the center lug strip 48 from opposite sides thereof and effectively hold it against: dropping.

For pulling the rcenforcement upwardly into tight engagement with the top closure member, there is provided a bridge 55 lying beneath the; arms 53 and having the lower end of the screw shaft- 56 projecting thcrethrough. This shaft is freely rotatable in the bridge but carries at its lower end a nut 57 for limiting downward movement of the bridge and for effecting raising of the bridge upon operation of the screw shaft. The shaft is threaded through a lug58 proecting from the arm 25 and is guided by an upper lug 59, whereby rotation of the shaft bymeans of its handle 60 will result in raising or lowering the reenforcementholding means as well as the reenforcement *arried thereby.

For forming a center lag of the desired shape, there is utilized a core 61, as indicated in Figure 1.0, which is placed in position below the strip 48 and which is provided with a recess 62 for the lower ends of the holders 51 and the feet 52 thereon. This core fits snugly between the recnforcement and the strip 48 and is held against accidental movement thereby.

In Figure 12 there is indicated a slightly modified form of core in which spaced recesses 62" are provided in place of the single recess 62, each of these recesses being of sufficient size to receive one of the feet 52.

In order to facilitate movement of the top of the top closure member may be provided with an opening (35 solocated as to lie above the plane of contact of the side and end receptacles. A similar opening 66 may be provided in the form of the invention illustrated in Figures 8 and 9.

In many cases it has been found desirable in order to increase the length of life of the mold, or to maintain more nearly uniform temperature conditions therein to utilize different ends of the mold at different times. Such a condition is fully described in my Patent No. 1,542,6l1 of June 16, 1925. In accordance with the present invention similar results may be accomplished by merely releasing the bridge 15 and reversing it end for end.

The bridge 15 may be of sectionalized construction if desired, as shown in my Patent No. 1,542,637 referred to, or may be in one piece as desired. The sectionalizing of the bridge, where such a construction is utilized, and the sectionalizing of the top closure not only insures proper ventin of the gases, but expedites renewal or rep .acement.

Certain advantages of the present invention arise from the provision of an improved mold, and more particularly a mold of the repetition type in which provision is made not only for the proper positioning of all of the members Without complete removal of any of such members,-but in which the relationship between the members is such that they are automatically locked against relative movement when in closed position.

Other advantages of the invention arise from the provision of an improved mold of the character referred to together with quickly releasable means effective for not only holding an insert in position, but for drawing such insert tightly against'one of the mold surfaces.

Another ad *antage of the present invention arises from the provision of a reversible bridge member constituting a portion of the mold cavity and not only effective for properly positioning the side receptacles during closing movement but also reversible end for end for the purpose described.

Still other advantages of the present invention arise from the mounting of the bridge, from the construction of the side reecptacles, and from the provision of counterweighting means for the top closure.

A still further advantage of the present invention arises from the provision of a mold, and more especially a repetition mold of such construction that the use of Wires, clips, or other independent means of similar nature for the holding in place of a metallic insert is rendered unnecessary and a relatively permanent structure provided for cooperation with inserts as required during the use of the mold. Such a construction further obviates the necessity of utilizing preformed cores, plugs, or the like as heretofore frequently required for the reception of the holding wires or clips.

I claim:

1. A repetition mold comprising a top closure member having pivotally mounted relatively movable parts, which, when in assembled position, form a casting gate but which may be separated to free such parts from the formed gate.

2. In a repetition mold, having an open top mold cavity, a pivotally mounted top closure, and a movable end receptacle effective upon and by movement to closed position -for locking said top closure in closed position.

3. A repetition mold, comprising a permanent mold structure having an open top mold cavity, a top closure pivotally mounted on the mold structure, a. second movable mold member, and locking means carried by said second movable mold member for holding the top closure in desired position to the mold structure, said locking means being effective upon and by relative movement only between second movable mold member and the top closure.

4. A repetition mold comprising a permanent mold structure having at least one movable mold portion, and a top closure member pivotally mounted on the mold structure, said first mentioned movable mold portion being shaped to engage the top closure member and lock the same in place.

5. A repetition mold comprising a permanent mold structure having a pivotally mounted side, and a top closure member pivotally mounted on the mold structure, said top closure member and side member having a key and recess adapted to lock said parts together.-

6. A repetition mold comprising a. permanentmold structure having an open top mold cavity, a top closure member movably secured to the mold structure for predetermined relative movement, holding means on the top closure member for a reinforcement, and at least one movable member on said top closure forming an openable gate.

7. A-repetition mold comprising a permanent mold structure having an open top mold cavity, a top closure member movabl-y secured to the mold structure for predetermined relative movement, said top closure member having a plurality of openings therethrough, at least one of which forms a pouring ate and holding means on said member or holding a reinforcement over one of said openings in such manner that it forms a part of the mold while permitting the passage of metal through said pouring gate.

8. A repetition mold comprising a permanent mold structure having an open top mold cavity and a pivoted top closure having portioiis which, when in assembled position, form a casting gate, the mold structure having at least one movable member, and means on the movable member for engaging the said portions of the top closure for locking the-same in assembled position. a

9. A repetition mold comprising a .top closure member having relatively movable parts mounted thereon, which, when in assembled position, form a casting gate but which may be separated to free such parts from the formed gate.

10. In a repetition mold having an open top mold cavity, a pivotally mounted sectional top closure, and a movable end receptacle directly engaging and locking said top closure in closed position.

11. A repetition mold comprising a permanent mold structure having an open top mold cavity, a sectional top closure pivotally mounted on the mold structure, a single pivotal mounting for said top closure, and locking means for holding ,the top closure in desired position relative to the mold structure.

12. A repetition mold comprising a permanent mold structure having at least one movable mold portion, and a sectional top closure member pivotally mounted on,,the mold structure, said first mentioned movable mold portion being shaped to directly engage the top closure member and lock the same in place.

13. A repetition mold comprising a permanent mold structure having at least one movable member, and a sectional top closure member pivotally mounted on the mold structure, said top closure member and the movable member having a key and recess adapted to lock said parts together.

14. Ina mold, a top closure, and gate forming'portions pivotally carried thereby.

15. In a mold, a movable top closure, gate forming portions movably carried thereby, and means for first moving said portions and then moving said top closure.

16. A repetition mold comprising pivoted mold portions, and a bridge member lying between said portions and extending over and embracing their pivoted pointsuto prevent removal of the pivotal connection with the bridge member in operative position.

17. A repetition mold comprising a movable top closure having relatively movable parts mounted thereon, which when in assembled position form a casting gate but which may be separated to tree such parts from the formed gate.

18. In a mold, a top closure, and gate forming portions movably carried thereby.

19. In a mold, a top closure having an openable gate extending therethrough and con'iprising at least one movable section, said section being movable with'the top closure in position.

20. A repetition mold comprising relatively movable mold portions, a pouring gate, a stationary mold member below the pouring gate mounted for reversal end for end, and clamping means detachably engaging the end portions of said member only for holding it in either position.

21. A repetition mold comprising relatively movable mold portions, a pouring gate, a stationary mold member having depending supporting legs formed thereon, said mold member being positioned below the pouring gate and mounted for reversal end for end, and clamping means detachably engaging said legs only for holding said .member in either position.

22. A repetition mold comprising rela tively movable pivotally mounted mold portions, certain of said pivotally mounted portions cooperating to form a gate, and a reversible bridge member below said gate lying in a plane substantially normal to the pouring axis of the gate.

23. A repetition mold comprising pivoted mold portions, a reversible bridge member lying between such portions, and swinging clamping means cooperating with said bridge member.

24. A, repetition mold comprising mold portions -i'novable about a common pivotal axis, and a bridge member lying between such portions and over said pivotal axis and forming the bottom of the mold cavity.

25. A repetition mold comprising a re ceptaclc member having an open channellilge face, and a block lying in the channel and substantially filling the same, said blot-k having a supporting projection extending outside of the receptacle member and said block and projection being reversible through said open face.

26. A repetition mold comprising a permanent mold structure having an open top mold cavity, a top closure member movably secured to the mold structure and having a gate therethrough, and counterbalaneing means 't'or said top closure, said gate being formed by relatively movable gate forming sections carried by the top closure.

27. A repetition mold comprising a permanent mold structure having an open top mold cavity, a top closure member comprising a plurality of relatively movable gate forming sections movably secured to the top closure for predetermined relative opening movement, and holding means on the top closure member for a reinforcement.

28. A repetition mold comprising a permanent mold structure having an open top mold cavity, a top closure member comprising a plurality of relatively movable gate forming sections movably secured to the top closure for predetermined relative opening movement, and holding means on the top closure member for a reinforcement, said holding means comprising a swinging hook structure.

In testimony whereof I have hereunto set my hand.

CLIFTON D. PETTIS.

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