Molding apparatus.

Abstract

Claims

S. GRIFFITH. MOLDING APPARATUS. APPLICATION FILED NOV. 25, 1007. Patented Feb. 23, 1909. 2 SHEETS-SHEET 1. I S. GRIFFITH. MOLDING APPARATUS. APPLICATION IILfiD NOV. 25 Patented Feb. 23, 1909. ism STANTON GRIFFITH, 0F ROCKFORD, ILLINOIS. MOLDING APPARATUS. Specification of Letters Patent. Patented Feb. 23, 1909. Application filed November 25, 1907. Serial N 0. 403,578. To all whom it may concern: Be it known that I, STANTON GRIFFITH, a citizen of the United States, residing at Rockford, in the county of Winnebago and State of Illinois, have invented certam new and useful Improvementsin Molding Apparatus, of which the following is a specifica- .ltion. One of the objects of this invention is the provision, in a molding machine having a pattern and flask arranged to be inverted for the ramming operation, of means for lowering the attern and the flaskto a position where t e workman can conveniently rain the sand.- Another object is the production of a collapsible or telescoping pattern. The invention also relates to the other im rovements hereinafter set forth. n the accompanying drawings, Figure 1 is a'vertical central sectional view through a molding machine and telescoping pattern embodying the features of my mvention. In this view the flask is shown in the position it occupies during the ramming operation. Fig. 2 is 'a fragmental sectional View representing the flask as having been rotated into position for drawing the pattern. Fig. 3 . shows the pattern drawn and the flask being removed. In the illustrative embodiment shown in the drawings, the pattern and the flask are supported upon a circular plate 1 provided at two diametrically opposite points with trunnions 2. Said trunnions are journaled in bearings 3 in the upper ends of two standards 4, which standards, in this instance, constitute piston rods for the pistons of two cylinders 5. Said cylinders are rigidly mounted in a vertical position in a frame 6, are connected with a source of pressure-fluid, and are provided with any suitable valve mechanism. The pattern herein shown is intended for the formation of molds for a stepped pulley having four steps or belt faces. A member 7 havmg an annular tapering wall 8 and 'an annular inwardly extending flange 9, is rigidly secured in any suitable way to one face of the pattern-carrying plate 1, and to the 0p osite face of said plate is fixed in any desire way a guide cylinder 10. Within the guide cylinder 10 is movablymounted a circular plate 11 to which is fixed four concentric cylinders 12, 13, 14, 15 of differing diameter A part of each of said cylinders ,ing 21 in its end wall 22. tion 16 intended to form a seat for the core in the mold. The outer ends of the cylinders 13, 14 and 15 are closed, in this instance, by means of strip er rings 17, each of Which rings, as herein s own, is ri idly connected to one end of a cylinder 18. pon the opposite ends of the cylinders 18 is formed guide means 19 for guiding the cylinders in their movementsbetween the cyhnders 12, 13, 14 and 15. To the side of the plate 1 opposite to that upon which the pattern is mounted is fixed a housing 20 having a screw-threaded open- An operating screw 23 extends through said opening and is rotatably connected with the section 16 of the pattern. To the outer end of the screw 23 is fixed an operating hand wheel 24. Two rods 25 are fixed to each of the cylinders 18- at diametrically 0 posite points on said cylinders, and pass freely through 0 enings in the plate 11 and the end wall 22 o the housing 20. Upon the projecting ends of said rods'are fixed heads 26 adapted to limit their movement in one direction. When said heads stop against said end wall the stripper rings 17 lie in position to close the outer ends of the cylinders 13, 14 and 15. At a suitable point in the length of the rods 25 are fixed collars 27 adapted to be engaged by the plate 11, as will appear hereinafter. The flask 28, in this instance, comprises a c lindrieal section 29 and a bottom board 30, tile latter being removably held in position by means of clampin screws 31 carried by two arms 32 rotatably mounted upon the trunnion-s 2. Any suitable means maybe em )loyed for rotating the pattern and the flask. hat herein shown comprises a train of reducjn gears 33 operated by a hand wheel 34 and Iocked against mo\"cmcnt by a hand wheel 35. Af- tor the sand has been rammed the flask is rotated into the position shown in Fig. 2. I have hcrcin shown a table 36 for receiving and witl'ulrawing the flask, said table being carried by the piston rod 37 of a hydraulic or pneumatic cyhnder, 38.' The table is guided in i s movements by the guide rods 39. Assuming the pattern to be in the position indicated in Fig. 3, the operation is as follows: The pattern is extended into operative position by rotating the hand wheel 24. The rotation of the screw 23 causes the plate 11, with the cylinders 12, 13,- 14 and 15 fixed thereto, to be moved downward to extend beyond the member 9, as shown in Fig. I. Said cylinders in their movement carry ,with them the cylinders 18 supporting the stripper rings 17. The movement of said stripper rings is positively limited at the proper time by the heads'26 engaging the end wall 22 of the housing 20. Such engagement also positively limits the extent of movement of the pattern-sectionslZ, 13, 14 and 15. The pattern is then inverted by rotating the hand wheel 34, and lowered by e crating the cylinders 5 to a oint where tile workman can conveniently andle the flask and ram the sand. The flask-section 29 is then put in place and filled with sand. 1 During the ramming, the plate 11 provides an unyielding sup ort for the stripper rings 17. After the san has been rammed the-bottom board 30 is put in position and secured by means of the clampingscrews 31. The pattern and the flask are then elevated by means of the cylinders f5, and the flask rotated into the position shown in Fig. 2. After the table 36 as been placed beneath the flask, the-pattern is drawn by rotating the operating screw 23. The rotation of said screw moves the plate 11 through the guide cylinder 10, said plate carrying with it the cylinders 12, 13, 14 and 15. The stripper rings 17 remain in the position they occupied during the moldin operation, until the plate 11 engages't e collars 27, when sajidstripper rings are drawn into the guide cylinder 10. will be seen, the] sections of the pattern are positively guided to 'move instraight lines and their movement is. so firm and steady that the castings made from the mold ale smooth and true, consequentlygreatly lessenin'gthe amount of machining necessary in finishing the castings. After the pattern has'been drawn, as ust described, the clam ping screws 31 are loosened, the arms 32 swung to one side, and the table'iio lowered with the flask resting thereon. Said tlask is then removed .-from the machine in any convenient inanner. .The foregoing detailed description has been given for clearncss of understamliug 'only and is not to be regarded as in the nature of-an undue limitation. and a plurality of concentric cylinders secured together and movable in said guide cylinder. 3. A pattern comprising a guide. cylinder: 8. set of concentric cylinders secured together and movable into and out of said guidd cylinder; stripper rings closing the outer ends of I certain of said cylinders; means formoving said cylinders; and members attached to said stripper rings-adapted to be enga ed by said cylinders in the movement of the%atter. 4. A pattern comprising a guide cylinder; a set of concentric cylinders secured together and movable within said guide cylinder; stripper rings for closing the outer ends of certain of said cylinders; means for moving said cylinders; a member attached to each stripper ring adapted to be engaged by said cylinders in the movement of the latter; and means for limiting the movement of said. members in one direction. 5. In a molding apparatus, a pattern-carrying late; a guide cylinder onsaid plate; a set 0% concentric cylinders secured together and movable within said guide cylinder; stripper rings for closing the outer ends of certain of said cylinders; a screw for movin said cylinders; a structure secured tosai pattern-carrying plate, with which structure said screw has a screw-thread c.onnection;' and means attached to, said strip er rings adapted to, be engaged by said cy md'ers in the movement of the latter, the movement of said cylinders and stripper rings, in one direction being limited by said structure. 6. In a molding apparatus, a pattern-car ed to engage said structure for limiting the movement of said cylinders and stripper rings in one direction. 7. A pattern comprising a guide cylinder; a set of concentric cylinders secured together and movable within said guide cylinder; sti'ippern'ings for closing the outer ends of certain of said cylinders; guide means attached to said strip )er rings and lying between said cylinders or guiding said stripper rings in their movements; aml means for moving said cylinders and stripper rings. . 8. A pattern comprising a circular plate; a plnralit-yol' cmicentric cylinders of dillerent lengths secured to said plate; guide means for said cylinders; stripper rings for closing the outer ends of certain of said cylinders; and means for moving said cylinders and said stripper rings. t A pattern comprising a circular late; a plurality of com-entric cylinders of dillerent lengths secured to said plate; stripper rings carrying plate; a for closing the outer ends of certain of said i cured to said pattern-carrying cylinders; means attached to said stripper rin s and eatending through said plate and adapted to be engaged by said plate in its movement; and means for moving said plate and the cylinders attached thereto. 10. In a molding a)paratus, a patterngui 0 cylinder on said plate; a circular plate; a set of concentric cylinders of different lengths secured to said plate and movablednto and out of said guide cylinder; stripper rings for closing the outer ends of certain of said rylinders; guide means attached to.said stripper rings andslidably mounted between sau cylinders for guiding said stripper rings; rods attached to said guide means and extending freely through said circular plate; a structure soi l i late; a screw attached to one of said movab e cylinders and having a serew-thrraul connection with said structure for moving said set of concentric cylinders; means on said rods adapted to he engaged by said circular plate in its movement, said plate being arranged to engage said guide means for moving said stripper rings into orierative position;and members ensaid rods adapted to engage said structure for limiting the movement of said set of eylinders and said stripper rings in one direction. STANTON GRTFFITH. Wit nesses G. W. S'ronev, (lumen-w. Pansons.

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    Publication numberPublication dateAssigneeTitle
    US-2817883-ADecember 31, 1957Allis Chalmers Mfg CoMachine for making molds