US1859658A - Molding apparatus - Google Patents

Description

May 24, 1932. M. K. DOUGLAS 1,859,658

MOLDING APPARATUS Filed March 26'. 1929 2 sheets-sheet 1 ORNEY A ORNEY 2 Sheecs-SheefI 2 M. K. DOUGLAS MOLDING APPARATUS Filed March 25. 1929 May 24, 1932.

||| lllwlldllli Patented May 24, 1932 UNITED STATES PATENT GFFCE MALCOLM KENNETH DOUGLAS, OF NEW YORK, N. Y., ASSIGNOR T AMERICAN RADIA- TOR COMPANY, 0F NET YORK,1\T. Y., A CORPORATION OF NEW JERSEY MOLDING APPARATUS 'Application filed March 26, 1929.

' ratus by which a plurality of molds may be made simultaneously.

The invention consists in the improved construction and combination of parts, and their aggroupment in operative relation, to be more fully described hereinafter and the novelty of which will be particularly pointed out and distinctly claimed.

In the accompanying drawings, to be taken as a part of this specification, 1 have fully and clearly illustrated a preferred embodiment of my invention, in which drawings- Figure 1 is a view in front elevation of my apparatus;

Fig. 2 is a view in side elevation looking from the left toward the right of Fig. 1 and showing the upper portion thereof with a lifter member applied thereto;

Fig. 3 is a top plan view of Fig. 2;

Fig. 4 is a top plan view of the flask shown in Fig. 1;

Fig. 5 is a bottom plan view of the flask;

Fig. 6 is a view in front elevation similar to Fig. 1, but showing the stripper plate in raised position;`

Fig. 7 is a detail of a pattern bar in longitudinal central section;

Fig. 8 is a View in front elevation and partly in section of a stripper plate; Y

Fig. 9 is a top plan View of the stripper plate shown in Fig. 8, and

Fig. 10 is a view infront elevation and partly in section showing a completed mold provided with a core and ready for pourmg.

Referring to the drawings by characters of reference, the numeral 1 designates a flask body, preferably of cast-iron, comprising a plurality of cylinders 2 which are Serial No. 349,918.

joined by. webs 3. The cylinders 2 are hollow, each having a concentric cylindrical bore extending longitudinally therethrough to provide casting chambers l which are of a radius equal to the radius of the pipe plus the sand mold thickness. At the ends of theV body and in the planes of the ends thereof, are transversely extending, surrounding flanges, that at the top end being designated 5 and that at the bottom end, which constitutes a base member, being designatedA 6. Extending between the flanges 5', 6 and along the cylinders 2 are reinforcing ribs 7 joined by transverse ribs 8 which surround the body 1. Extending downward from the flange 5 at the sides of the body 1, are block members 9 having downward facing hooks 10. Through the blocks 10 and the flange are vertical guide openings or apertures 11.`

Through the flange 6 at the sides of the body 1 are apertures 12 for securing the body 1 toy a supporting member. The top or upperl ends of the chambersl are enlarged, as at 13,'for a purpose to be described. Theside walls of the cylinders 2 are perforated, as`

at 111, to vent the mold.

The flask body 1 is supported on a bottom plate or board 15 which is preferably mounted on the platform 16, of a vertically reciprocable jolt machine, by which the molding sand is rammed. The jolt machine, generally designated 16', may be of any well known type and is not part of my invention. Rigidly fixed to the platform 16 are pins 17 which project upward through the plate 15 and the apertures 12.` Transversely through the pins 17 adjacent their upper ends are longitudinally extending slots 18 through which wedges 19 are driven to clamp the body 1 to the jolt machine. Concentric with the chambers l are apertures 20 in the plate' 15, and in which are positioned bushings 21 having downward converging bores 22, each of which is concentric with its chamber 4. 4

Supported on the flask body 1 is a stripper plate 23 having spacer means or feet 24 which rest upon the top flange 5 adjacent the sides of the body 1 to maintain the plate 23 in spaced relation to the body 1. Concentric with the guide apertures 11 are guide aper-` a the tures 24 in the plate 23. Concentric with the chambers 4 are circular apertures 25 in plate 23, and depending from the plate 23 are sleeve members 26 which extend into the apertures and are secured rigidly therein by screws 27, or the-like. Thebores of thelsleeves converge downward for the major portion of their lengths, as at 28, and at their bottom ends are cylindrical, as at..29, and. of a diameter equal,tothe diameter of the moldlpattern bar to be described. At the ends of the plate 23 are hand-grips 30, preferably substantial'- ly U-shaped members, which are secured rigidly to the plate by bolts 31, or the. like.

Positioned within each ofv the chambers 4k is aicylindrical pattern-bar 32, Figs. .1, Gand:

8, preferably" of. seamless steel tubing, of a diameter equal to the outside diameter of the ipe to beproduced. At its lower end,

fiar; 32` is of reduced diameter, as at 33, to receive'a sleeve 34' of an outside diameter equal to the diameter of bar 32, and which is of harder'steel towithstand the greater wearin'gj to which-the lower portion of the bar is subjected; Ai plug member 35 is inserted in the topfenddof-thebar to close the bore. At its lower'end the bore of'the bar is enlarged, asat 37to provideV a shoulder'38', and is internallytlireaded thereabove, as at 39, to rez ceive a plugmember 40'I which seatsagainst the should'er 38 and has an upward extendingpin141 which is threaded for engagement with threads 39 to tightlyseat' member 40 against shoulder 38. Dependingfrom meml ber 40lconcentric with bar'32, is a truncated,

conical' centering pin 42 Vwhich fits in the bushing bore 22 and. lwhich provides a sur'- rounding'shoulder 42' which seats on the bottom plate 15. At the upper'ends of the bars 32 is a cross-head or supporting member 43 having apertures 44 concentricwith the chambersv 4 and" into whichtlie bars 32'tightlyfit. Each of the bars 32 ishelfd'in its aperture 44 by af pin l45 passed-throughout the cross-head andeal'ined holjes 46inlgthe-bars. Depending from theY cross-lieadf43are centering or position-ingpins 47 having a sliding fit inthe guide apertures 11 and 24, such that when the pins 47 are inthe apertures 11 and'24, the stripper plate 23V will be properly'p'ositionedonthe flask body and the upper ends of" thebars 32` will1 be heldr rigidly concentric wtlitheir'respective chambers 4. The pins 47 are preferably secured to the cross-head `43jby locking pins 48- passed through the cross-head and pins 47 Ateach end the crosshead isverticall)7 slotted, as at 49, to provide bearing arms 50`through which, adjacent the bottom of the ,cross-head, are alined apertures to receive a bearingorpivot pin 51. I

p PvotedV on pins 51` are latchmembers 52 having` hand grips 52. The members 52 have stops53'to engage the base of the slots 49,x to limit swingA of the lower ends of the latch members 52 toward the centering pins 47. Resilient members 54 act on the latch members 52 to normally urge the stops 53 into engagement with the cross-head. Each of the members 54 preferably comprises a coil spring which seats at one end in a socket 55 at the upper end of the base of the slot 49, and which bears at its opposite end -against the latch member 52 above pivot pin- 51..v Each member 52 has an inwardly extending latch. tooth 56 which is beveled on its under side, as at 57. The latch members 52 are positioned above the ends of the stripper plate 23 so that they will be guided by the beveled-edges 57 to pass through the rectangular openings 58 formed by the hand grips 3() when the plate is raised. As the plate is moved above the level of the teeth 56, the teeth 56 will be moved to supporting position, Fig. 6, beneath the plate by the springs 54 to hold the plat-e in raised position. On the cross-head 43 between the pins 47 and the latch members 52, are supporting members 59, preferably U-members, secured thereto by studs 60, or the like, threaded into the cross-head. Each of the members 59 has a forwardly projecting, substantially horizontal lug 61 providedA with a vertical aperture 62. Carried by the members 59 is a lifter mechanism 63, comprising arm members 64 which depend from the lugs 6l, and preferably have hook ends 65 which fit in the apertures 62to removably support the mechanism from the cross-head. The arm members 64 are preferably rigidly tiedV together by av rod or bar 66, and each ofthe members 64 is bifurcated at its free lower end, as at 67, to provide a yoke. Journaled or fulcrumed between the yoke arms of each member 64 on a pin 68 passed therethrough, is a` lever member 69 which is bent to provide abearing part' having'an arcuate surface, as at 70, to engage the underside of the stripper plate 23 just outside of the sides of the flask body 1., The cross-head 43 is preferably provided with shackles 71 for a hoisting chain, or the like, 72, by which the cross-head and pattern bars 32 may be lowered into position or withdrawn from the chambers 4.

The operation of forming a mold with my improved apparatus, is as follows: T he flask body 1 is lifted by a chain hoist or other means engaging the hooks 10, and is placed thereby on the bottom board 15 on the jolt machine platform 16 with the pins 17 passing through apertures 12 to center the body chambers 4 with respect tothe bushings 2l. The wedges 19 are then driven into the slots 18 to clamp the body 1 in position. The stripper plate 23 is placed on the top flange 5 by means of the hand-grips 30, with apertures 24 and 11 alined, and with the sleeves 26 depending into the chamber enlargements 13. The pattern bars 32fcarried by the crosshead 43 are then lowered by ahoist or other means engaging chain 72 through the guide sleeves 26 of the stripper plate 23 and into the chambers 4. As the centering pins 47 approach the alined apertures 11 and 24', the pins are manually directed into the apertures 24', which will substantially aline the pins 42 with the bushing bores 20. When the pattern bars 32 have been lowered by the crosshead 43 to the position shown in Fig. 1, with the shoulders 42 flush with the plane of the top face of the bottom plate 15, the bars 32 are in operative mold-forming position. However', to insure that the bars 32 are properly seated, the jolt machine is worked a few times. The hooks of the lifter mechanism 63 are placed in the lug apertures 62 with the bearing parts of the lever members 69 positioned beneath the ends of the stripper plate 23, Figs. 2 and 3. The lever members 69 are then pulled downward about their fulcrums 68, i. e., in a clockwise direction of Fig. 2, which will lift the plate 23, sliding it upward on the bars 32 and pins 47 until the latch members 52 pass through the hand-grip openings 58, and the teeth 56 are snapped under the ends of the plate 23 by the springs 54. The lifter mechanism 63 is then unhooked from the cross-head lugs 61, leaving the plate 23 maintained in raised position by the latch members 52. Molding material or sand is shoveled, or otherwise fed into the annular spaces 73 between the walls of the chambers 4 and the bars 32. During this lilling of the spaces 73 the jolt machine is operated to pack or ram the sand until the spaces 73 are entirely filled with tightly packed sand and then the jolt machine is stopped. The stripper plate 23 is released from raised position, Fig. 6, by moving the hand-grips 52 of the latch members 52 toward each other against springs 54. The weight of the plate 23 will cause it to slide down on the bars 32 and pins 47 until the sleeves 26 rest on the sand in spaces 73. The jolt machine is again operated to pack or ram the sand at the top of the mold by means of the superposed weight of plate 23 and until the plate takes the position of Fig. 1, with feet 24 resting on the body 1. The plate sleeves 26 also serve, during this last jolting of the body 1, to form the end of the mold print, as indicated at 74 of Fig. 10. The pattern bars 32 are now drawn by means of the hoist connected to chain 72. When the patterns have been lifted clear of the flask body 1, the stripper plate 23 is lifted off by an operator and the top end of the mold is cleaned, preferably by a stream of air under pressure. This completes the formation of the hollow cylindrical sand molds, designated 75, Fig. 10, in the flask body 1. The body 1 is then placed on a bottom plate 76 which is substantially similar to plate 15 and is clamped thereto in the same manner as it is clamped to plate 15. The plate 76, however, is provided with cylindrical recesses 77 concentric with bushings 2O and of diameters substantially equal to that of chambers 4. The recesses are filled with molding sand, as at 78, and the sand mold and ring 78 are then hardened, as by baking in an oven or the like. After the mold has been hardened, cores 79, preferably of baked core sand supported on vented. core arbors 80, are placed in the chambers 4. The arbors 80 project above and below the cores 79, and at their lower ends converge downward to fit in the bushings 20, which centers the lower ends of the cores. At their upper ends the arbors 80 are removably secured in any suitable manner in an arbor carrier 81, from the 'underside of which depend pins 82 having a sliding fit in guide apertures 11, and by which the upper ends of the cores 79 are centered. Eyelets or rings 83 may be provided for attaching a hoist to the carrier 81 so that the cores may be simultaneously lowered into the chambers 4. Seated on the print end 74 is the usual pouring ring or cup 84. The mold is now ready for pouring, and the molten metal will fill-the-'annular space 85 to form a hollow tube or pipe.

What I claim and desire to secure by Letters Patent of the United States is:

1. In a molding apparatus, a pattern bar adapted to be positioned in a casting chamber of a flask body, and a stripper plate slidable on said bar, a supporting member secured to and extending transversely of said bar, said plate and said member having cooperable automatically acting means to hold said plate raised from the llask body. Y

2. In a molding apparatus, a pattern bar adapted to be positioned in a casting chamber of a flask body, a stripper plate slidable on said bar, and resilient catch means carried by said bar, said catch means being operable to engage said plate to hold said plate raised from the flask body.

3. In a molding apparatus, a pattern bar adapted to be positioned in a casting chamber of a flask body, a stripper plate slidable on.

said bar, a supporting member secured to and extending transversely of said bar, said plate and said member having cooperable means automatically acting to hold said lplate raised from the flask body, and means depending4 from said plate to form the end of the mold print.

4. In a molding apparatus, a pattern bar adapted to be positioned in a casting chamber of a flask body, a stripper plate slidable on said bar, and lifter mechanism supported by said bar and operable to engage said plate to slide said plate upward on said bar to a position above the flask body.

5. In a molding apparatus, a supporting member, a plurality of pattern bars depending from saidV member, said bars being rigid with said member and adapted to be positioned in the casting chambers of a flask body, and means carried by said member and vms CTI

aetngautomatieally to support a' stripper platein raised positionfabove the flask body upon engagement' of said plate and said means;-

'62. An appanatusfor forming a pipe mold, comprising a `flaskV body 'havingy longitudinal castingeharnbemn a pattern bar in each of saidchambers'and forming annular spaces in saidrehambers to receive mold forming material', means for'centering one end of each of saidfbarsinisaid. chambers, the other ends of' said bars projecting outside the other ends of saidrcham'bers,` means supporting said projeotingfends to holdsaidfbars in'spaced relati'on,.and1by Which said bars may be inserted in.faudi\vitl1drawn from'said chambers, a stripper' plate .having apertures slidablyren ceivingsaid projecting ends,said plate being located? between said supportingv means and theadjacentend of. said flask body, and lever meanscooperable with said plate tolit said plate on said bars toward said supporting` means..

Isn-testimony whereof I have hereunto signed my name.

MALCOLM` KENNETH DOUGLAS.

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