US720913A - Machine for making molds. - Google Patents

Description

No. 720,913. PATENTBD FEB. 17, 1903..

' F. w. HALL.

MACHINE FOR MAKING MOLDS.

APPLIOATION FILED SEPT. 26, 1902.

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No. 720,913. I PATENTED FEB. 17, 1903.

F. W. HALL.

MACHINE-FOR MAKING MOLDS.

APPLICATION FILED SEPT. 26, 1902.

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PATENTED FEB. 17, 1908;

v F. W. HALL.

MACHINE FOR MAKING MOLDS.

APPLICATION FILED SEPT. 26, 1902.

1m MODEL, 62 a SHEETS-SHEET a.

' lnmln l i Uta STATES- MACHINE FQRMAKENG MOLDS.

SPECIFICATION forming part of Letters Patent No. 720,913, dated February 17, 1903.

Application filed September 26, 1902. Serial Not 124,990. (No model.)

To all whom it may concern;

Be it known that I, FREDERICK V. HALL, a citizen of the United States of America, and a resident of Camden, county of Camden, State of New Jersey, have invented certain new and useful Improvements in Machines for Making Molds, of which the following is a specification, reference being bad to the accompanying drawings, in which Figure 1 is a front elevation of a machine, showing the essential featuresof my invention. Fig. 2 is a vertical section taken on the line 2 2 of Fig. 1. Fig. 8 is a side elevation. Fig. 4 is a detail vertical section of the sandhopper; Fig. 5, a detail of the lower end of one of .the lowering-rods; Fig. 6, a vertical transverse section through the pattern-carrier and attached sections of the flask. Fig. 7 is a detail perspective of one of the catches forlatching the bottom board to the drag or lower section of the flask.

The object of this invention is to provide simple and inexpensive machinery for eXpe-.

ditiously performing the operations incident to the making of molds, the molds being made in the common form of flask consisting of the cope and the drag andb eing completed ready for the foundry, as more fully hereinafter set forth.

In its preferred form the invention consists in the employment of a table to the upper and lower sides of which are respectively secured the upper and lower halves of thepatterns and an upper and a lower ramming device, whereby the sand in the cope-section and the sand in the drag-section ofthe flask may be rammed simultaneously, means whereby the sections of the flask are detached from the patterncarrying table after the ramming process and the table moved laterally to one side under the sand-chute and from between the sections of the flask, means whereby the sections of the flask may be brought together after the removal of the table and secured in the ordinary manner, thus completing the mold, and means whereby the pattern-table may be inverted or reversed while under the sand-supply device, so that the drag and the cope sections may be successively filled with sand preparatory to moving the table -baok between the ramming devices after the previously-made mold has been removed therefrom, as more fully hereinafter set forth.

Referring to the drawings by letters, A designates the main frame of the machine, which consists of suitable upright and horizontal beams. Depending from the top beams of the frame is a stationary cylinder B, and mounted stationarily on the lower beams of the frame is a similar cylinder B, these two cylinders being in vertical alinement. A common supply-pipe O supplies compressed air or other motive fluid to the respective upper and lower closed ends of these cylinders, this supply-pipe being provided with a supply-valve a and each branch being provided with an exhaust-pipe I), connected thereto at a point between valve to and the cylinder, each of these exhaust-pipes being provided with an exhaust-valve c.

\Vorking in each cylinder is apiston D, to

the outer end of which is rigidly attached a head-plate d, and rigidly attached to each head-plate is a pair of vertical guide-rods e, which work through guide-lugs f, carried by the cylinder. Normally holding up the upper piston and this head is a pair of weights g, which are located at the respective sides of the machine and are connected to the side edges of the head-plate d by a pair of ropes or cables h, which are carried up and over pulleys c', journaled in the upper part of the frame.

Supported a short distance below the upper head-plate d is aramming-platej of the proper proportions to fit within the cope when the upper piston is forced down. This ramming-plate is supported by a pair of vertical rods 7t, working up through holes in the headplate and each pivotally connected to a short horizontal shaft Z, journaled in suitable brackets on top of the head-plate and carrying a pair of hooks m, which depend through slots in the head-plate.

To depress the ramming plate or head 7', a pair of levers are employed, one of which is pivoted at each side of the machine upon a bracket 0 and whose inner ends terminate immediately above the upper ends of the rods 7c and whose respective outer ends are connected by suitable cords p to a treadle or lever q, pivotally supported in the base of ISO and then down to the treadle, so that when the treadle is depressed the outer ends of the levers will be simultaneously raised and cause their inner ends to bear down on the upper ends of the rods 74;.

To automatically open the exhaust-valve when the upper piston reaches a predetermined point in its downward stroke, I attach adjustably to one of the rods e a clamp s, in which is mounted an adjustable set-screw t, which at the proper point comes in contact with and depresses the free end of a lever tb, pivoted at a convenient point on the adjacent lugf. The other end of the lever u is pivotally connected to a vertical rod U, whose upper end is pivotally connected to a lever 10, and this lever to is in turn pivotally connected to a hand-lever 01;, which is connected to the stem y of the upper exhaust-valve c. Vith this arrangement of levers it will be observed that when the set-screw t depresses the free end of lever to the stem of the exhaust-valve will be drawn down and the valve opened, thereby permitting the release of the compressed air or other motive fluid and-the raising of the piston and its attached parts by means of the counterweights. To automatically close the exhaust before the piston reaches the upper limit of its stroke, and thereby cushion its return to normal position, an upright rodjor finger is attached to plate din such position that as said plate at rises the rod or finger will raise the depressed end of lever u, and thus close valve 0.

The stem z of the supply-valve may be drawn down and the valve thereby opened by hand; but this valve is closed automatically at a predetermined point in the movement of the lower piston by a series of devices similar to those employed to automatically open the exhaust of the upper cylinder-that is, by means of an adjustable clamp a, carrying a set-screw b, which is adapted to strike and elevate the free end of a lever c, pivoted on one of the adjacent lugsfand having its opposite end pivotally connected to a vertical rod 01, whose lower end is pivotally connected to a lever e, which is in turn pivotally connected to the lower end of the stem of the supply-valve.

To automatically open the lower exhaustvalve 0 just after the supply-valve is closed, a series of devices similar to those for opening the upper exhaust-valve is employed, the adjustable clamp on one of the depending rods e being designated by letter f and setscrew by g, the pivoted lever by h, the vertical rod by t", the intermediate lever by j, the hand-lever by and-the valve-stem by Z. To automatically close the exhaust through this lower valve 0, so as to thereby prevent the piston descending too far and striking the bottom of the cylinder or doing other damage by jarring, I attach to the lower head 01 a depending rod m, which when the piston descends strikes on top of the free end of the dog It and through the medium of the connecting-lever automatically closes the exhaust-valve.

The pattern-table consists, essentially, of a rectangular box-like frame 72, which is adapted to slide forward and backward between ways 0, attached to the inner sides of the re spective side beams, these ways being so located that the table will be supported at pointsequidistant from the upper and the lower heads d and in vertical alinement therewith. One half 19' of the pattern is attached to the upper side of the table, together with the pattern q for the sprue, and attached to the lower side of the table is the other half of the pattern 1", together with the gate-forming part 3 of the pattern. These parts of the pattern are secured in any suitable manner to plates t, which are set in suitable openings in the respective upper and lower sides of the table and are bolted in place by lag bolts or screws to, passing through the plates t and into or through suitable cross-bars o. By thus attaching the halves of the patterns to independently-removable plates new patterns may be substituted from time to time with ease and despatch.

Midway between its forward and rear edges at each side of the table is mounted a rectangular slide-block 20', which projects laterally from the end of the table midway between its upper and lower faces. When the table is moved rearwardly from between the ramming-plates, these blocks to pass between the rearward-projecting ways 00', and the table itself passes from between the main ways 0. When the table rests upon ways 0', these blocks '10 do not engage supporting-Ways, as the ways 00 terminate where the ways 0' begin. Each of these slide-blocks w is provided with a journal pin or axle y, which extends through the side of the pattern-table and is journaled in a suitable bracket 2', attached to the inner wall of the table, whereby when the table is pushed back between the ways a," free of the ways 0' it may be inverted, as shown in dotted lines in Fig. 2, the journals 3 serving as pivots for this purpose.

After the patterns are properly fastened to the respective upper and lower sides of the pattern carrier or table the first step is to place the drag-section a of the flask over the gate or lower section of the pattern, the table being slid out between the ways m directly under the sand chute or hopper b in order that the proper amount of sand may be delivered into the drag. The drag is held in proper place over the patterns by means of suitable pins 0 engaging ears on the side pieces of the drag. When the proper amount of sand is delivered into the drag-section, the bottom board 61 is placed thereon and is locked in place by means of four latches 9 which are pivoted two on the front side of the table and two on the rear side thereof and whichare each provided with hooked ends 1,

adapted to engage over and snap into recesses on the under side of the bottom board 61 near the edges thereof. The latches e have angular extensions g", to which are attached coilsprings 71?, the opposite ends of these springs being attached to the adjacent walls of the table. These springs tend to swing the latches away from the drag and out of engagement with the bottom board. When the drag is thus filled and covered and the cover is latched in place, the table is inverted on the pivots y, and then the cope i is put in place over the upper parts of the patterns, the cope being held removahly in place by means of suitable pins 3' engaging ears projecting laterally from the opposite sides of the cope. A suitable quantity of sand is then dropped into the cope from the sand-hopper b and the table is then slid forward onto the ways 0. The operator then opens the valve on by hand, thereby causing the two pistons to approach the respective sections of the flask. The lower head (1 strikes against battens k fastened to the bottom board 61 and forces the board up into the drag, thereby ramming the sand around the lower half of the pattern, and when this board has passed into the drag a short distance the springs 72 automatically release the latches from the board and thecope. Then when the head at has reached a predetermined point the supply of motive liquid is cut off through the medium of the set-screw h and the parts heretofore described, and immediately thereafter the lower exhaust c is opened by the means of the set-screw g and devices heretofore described, whereupon the head d is caused to immediately descend until the rod m closes the exhaust. hen the head cl thus descends, the drag descends with it, the drag having been released from the catches e lVhile the foregoing operations are taking place below the pattern-table the following movements of parts are taking place above the table: As the upper piston descends the platej enters the cope and packs the sand around the upper half of the pattern, and to complete the sprue-hole a conical pattern Z carried by the plate ,4, enters the sand and cooperates with the part q to complete the sprue-hole, said part 15 being provided with a central depression, into which the upper end of said part q enters. Before the ramming action takes place the platej is pressed up against head (1, and this action causes hooks m to swing downward and inward and engage in holes m formed in small plates fastened to the sides of the cope. Then when the supply of motive fluid is cut off from the cylinder and the exhaust is opened by means of the devices. heretofore described the countel-weights g automatically raise the head at and carry with it the cope, the hooks m serving to lock the cope to the head and the patterns p and q being of course left attached to the pattern-table. As the cope rises springactuated pins n strike-against the upper beveled edges of cams o and are forced outward sufficiently to pass into holes 10 formed in said parts 0 These pins n are each slidably supported in a horizontal tube g and are normally pressed inward by a coil-spring r inclosed in said tube, and each tube is attached to the lower end of a vertical rod 3 which works vertically through the upper part of the frame and through a guide-tube t and has attached to its upper end a cord at, which cord is passed over suitable pulleys o and is connected at its free end to a counterweight 20 whereby said rod is normally held up, its upward limit being determined by the position of an adjustable collar m which is adapted to abut against the under side of one of the top beams of the frame. At asuitable point each rod 3 is provided with a rule-joint 3 which permits the lower end of the rod to be swung outward away from the cope and limits the inward swing of said lower end, and to normally keep said lower end swung inward a suitable flat spring 2 is employed at each joint. There are four of these rods 5 two being located at each side of the machine. When the upper piston, with the attached parts, is thus raised to the upper limit of its stroke, it will be seen that the cope will be supported by the four books a and the four pins or fingers Now to detach the cope and lower it upon the drag resting on the lower head (1 (the patternta-ble having been shoved back out of the way under the sand-box preparatory to attaching and filling another cope and drag) the operator depresses treadle q, and thereby forces down the ramming-plate and swings outward the hooks n, and simultaneously therewith the operator takes hold of two of the tubes Q2 or two of the rods 3 or the cope itself and lowers the cope quietly until it rests upon the drag, which, as previously described, rests upon the lower head cl. Then the operator detaches the pins n by spreading the lower hinged sections of the rods 3 and permits said rods to. be automatically raised by means of the counterweights 10 The counterweights 'w' are of such weight as to normally hold up rods 8 but not heavy enough to prevent the operator drawing down or lowering the cope with case. When the cops and the drag are then fastened together in the usual manner, the completed mold is slid oif head 61 onto a table 50 in front of the machine.

It is of course understood that while one operator is bringing the parts of the flask together and fastening them another operator is attaching the parts of a new flask to the table and filling them, as before described, preparatory to pushing the table back between the ramming devices. Any suitable devices may be employed for filling the flasksections with sand. I have shown the depending hopper 6 divided centrally by means of a vertical partition d forming two exits, each of which is closed by a spring-actuated IIO- gate 12 which may be conveniently opened invention.

by a depending pulley-cord 0 Supported above each compartment of the hopper is a sieve C1 and supplying each sieve is an endless-belt elevator e running on an overhead shaft. By thus employing a pair of elevators and a divided hopper the amount of sand dropped into the flask-sections may be regulated, so as to avoid waste of sand, it being designed to use one of the compartments of the hopper for the cope and the other for the drag and the speed and capacity of the elevators being properly proportioned to feed the exact amount of sand required for each mold, it being evident thatin some cases more will be required for one of the sections than for the other.

It will be observed that the construction and arrangement of parts shown and described may be greatly varied without departing from the scope of the claims. For instance, any other suitable devices may be employed for automatically governing the movements of the piston and ramming devices without departing from the spirit of the Also the various parts may be made adjustable to accommodate flasks of different sizes. It may also be possible to avoid supporting the ramming-plate j removably and employing the hooks n, as the rods 3 and their fingers 42 may be employed to raise the cope OK the table after the ramming operation, or other suitable devices may be employed forthis purpose.

Having thus fully described myinvention,

what I claim, and desire to secure by Letters Patent, is

1. In a machine of the class described, the combination of a frame, upper and lower ramming devices, an intermediate pattern-table adapted to support the cope'on its upper side, a drag-section and means for attaching it to the under side of the pattern-table, means for simultaneously operating the ramming devices, means for releasing the drag and its bottom board from the pattern-table, means for automatically lifting the cope-section off the table after the ramming operation, and means whereby the table may be moved laterally from between the ramming devices.

2. In a machine of the class described, the combination of a frame, a pattern-table, a cope adapted to rest thereon, a head-plate over the cope-section and means for vertically reciprocating it, a ram-plate supported under said head-plate, and means carried by the head-plate and operated by the pressure on the ram-plate for automatically picking up and raising the cope ofi the pattern-table after the ramming operation.

3. In a machine of the class described, the combination of a frame, a pattern-table, a cope-section thereon, a ram-plate above the cope-section and means for forcing it down into the cope-section,means for automatically picking up and elevating the cope-section upon recession of the ramming devices, and means for lowering the cope-section when it is disengaged from the ramming devices, for the purpose set forth.

4. In a machine of the class described, the combination of a frame, a pattern-table, a flask-section adapted to be supported thereon, a ramming device supported over the flasksection, a ram-plate movably supported on this ramming device, and means operated by the movement of this ram-plate for engaging the flask-section during the ramming operation and raising the same upon recession of the ramming device.

5. In a machine of the class described, th combination of a frame, a pattern-table, a section of a molding-flask adapted to be supported on the table, a ramming device supported over the flask-section, a ram-plate and means for movably supporting it on the ramming device, and hooks carried by the ramming device and operated by the movement of the ram-plate to automatically engage the flask-section during the ramming operation, whereby when the ramming device recedes the flask will be elevated therewith.

6. In combination, a frame, a pattern-table, a section of a molding-flask thereon, aram device supported over the flask-section, and a movable ram-plate supported on the ramming devices, and pivotal hooks connected to the ram-plate adapted to be automatically engaged into the flask-section during the ramming operation, and means for disengaging said hooks to release the flask.

7. In combination, a frame, a pattern-table, a molding-flask section on the pattern-table, a ramming device over the pattern-table and means for bringing the two together, a movable ram-plate andmeans operated thereby to engage the flask and cause it to lift the flask-section after the ramming operation, and means for releasing the flask.

8. In a machine of the class described, the combination of a frame, upper and lower ramming devices, an intermediate pattern-table adapted to support the cope on its upper side and means for attachingthe drag and its bottom board to thelower side,means for simultaneously operatingthe ramming devices,means for releasing the drag and its bottom board from the pattern-table, and means for lifting the cope-section off the table after the ramming operation, and means whereby the table may be moved laterally from between the ramming devices.

9. In a machine of the class described, the combination of a frame, upper and lower ramming devices and means for simultaneously operating them, an intermediate pattern-ta ble and means whereby it may be moved laterally and inverted, sand supply devices, means for latching the drag and its bottom board to the table when the same is inverted, and means for automatically lifting the copesection off the table after the ramming operation, and means for releasing the drag-section and its board from the lower side of the pattern-table, so that the same may recede from the pattern-table.

10. In a machine of the class described, the

combination of a frame, a pattern-table carrying-patterns on its upper side and adapted to receive a cope, a ramming-plate supported above said cope, means for depressing said ramming-plate into the cope, means for automatically engaging the cope-section during the ramming operation, said means consisting of depending hooks normally held out of the path of the cope and adapted to be brought into engagement therewith during the ramming operation, and means for elevating the ramming-plate and carrying with it said cope.

11. In a machine of the classdescribed, the combination of a frame, upper and lower ramming devices, a laterallymovable pattern-table supported therebetween, means for latching the drag-section to the under side of the table, means for releasing said drag-section from the table, so that said drag may recede with said ramming devices, means for causing the cope to be raised olt the upper side of the table upon recession of the upper ramming devices, and means whereby the cope and the drag may be brought together upon removal of the table.

12. In a machine of the class described, the combination of a frame, a pattern-table adapted to support a cope and a pattern on its upper side, a ramming device supported thereover and adapted to move toward the cope and recede therefrom after the ramming coperation, means for automatically picking up the cope off the table and causing it to be elevated with the ramming devices, and means for releasing the cope from said devices, and means for lowering it away from said ramming devices. 1

13. In a machine of the class described, the combination of a frame, a table adapted to carry a pattern and a cope, vertically-reciprocating ramming devices supported thereover, means for engaging the cope and lifting it off the table upon an upward movement of the ramming devices, and a series of vertically-reciprocating rods normally held up and carrying means at their lower ends for engaging the cope, whereby the cope may be lowered away from said ramming devices after its release therefrom.

14. In a machine of the class described, the combination of a frame, upper and lower ramming devices and means for simultaneously reciprocating them toward each other, an intermediate table carrying on' its upper side one half of a pattern and on its lower side the other half of the pattern, the table being adapted to support the cope on its upper side, means for latching the drag and its bottom board to the lower side, means whereby the table may be moved laterally from between the ramming devices, and means whereby the upper ramming devices will release the cope from the table and means whereby the lower ramming devices will release the drag from the table, leaving the table free to be moved laterally out of the way, and means whereby the cope and the drag may be brought together to complete the mold.

15. In a machine of the class described, the combination of a frame, upper and lower ramming devices, a laterally-movable patterntable supported therebetween, means for latching the drag-section to the under side of the table, means for releasing saiddrag-section upon recession to the lower ramming devices and allowing said drag to recede with said ramming devices, means for causing the cope to be raised elf the upper side of the table upon recession of the upper ramming devices, and meanswhereby the cope may be lowered onto the drag after the removal of the table.

16. In a machine of the class described, the combination of a frame, a pattern-table, a flask-section thereon, means for automatically engaging the fiask-section during the ramming operation and lifting it off the pattern-table upon recession of the ramming de-' vices, and independent devices for engaging the'flask-section automatically as it ascends and lo'wering it away from the ramming devices when it is released therefrom.

In testimony whereof I hereunto afiix my signature, in the presence of two witnesses, this 23d day of September, 1902.

FREDERICK W. HALL.

W'itnesses:

GEORGE HENDREKSON, ETHEL HALL.

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