US430666A - Sand-molding machine - Google Patents

Description

(No Model.)

4 Sheets-Sheet 1.

T. MISTELSKI.

SAND MOLDING MACHINE.

' Patented June 24, 1890.

WITNESSES INVENTOR (No Model.) 4 Sheets-Sheet 2.

T. MISTELSKI. SAND MOLDING MACHINE.

- No.430,666. A PatentedJune24,1890u WITNESSES INVENTOR THE News PETERs ca, move-mum, msmuc'rcu, u. c.

(No Model.) 4 Sheets-Sheet 3.

T. MISTELSKI.

SAND MOLDING MACHINE.

No. 430,666. Patented June 24, 1890.

(No Model.) 4 Sheets-Sheet 4. T. MISTELSKI.

SAND MOLDING MAUHINE. No. 430,666. Patented June 24, 1890.

WHTNESSES T0 whom it may concern:

I UNITED STATE-S PATENT ()FFICE.

THEODOR MISTELSKI, OF ALLEGHENY, PENNSYLVANIA.

SAND-MOLDING MACHINE.

SPECIFICATION forming part of Letters Patent No. 430,666, dated June 24, 1890.

Application filed March 12, 1890- Serial No. 343,602. (No model.)

Be itknown that I, THEODOR MISTELSKI, a citizen of the United States, residing at Allegheny, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Sand-Molding Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to machines for molding molds for casting, and more especiallyto that class of such machines in which the flask is brought under a platen which compresses and packs the sand around the pattern, the flask being then removed from under the platen and the pattern withdrawn.

My invention consists, first, in the combination, with a stationary support for the platen, of a reciprocating carriage, upon which are mount-ed the tables on which the flasks are placed; second, in means for moving the carriage back and forth under the platen and for stopping it automatically or otherwise at any desired point in its travel; third, in a table for supporting the flask, made adjustable to suit flasks of different sizes; fourth, in a movable banking-frame adapted to be applied to a flask at either side of the platen and to move with the flask when the carriage is operated, and,fifth, in certain details of construction and arrangement that will be hereinafter set forth, and particularly pointed out in the claims.

In the drawings, Figure l is a side elevation of my improved machine. Fig. 2 is an end view, certain parts being shown in crosssection. Fig. 3 is a plan of the banking-frame and its guides. Fig. i is a perspective view of the bed. Fig. 5 is a longitudinal section of one of the tables. Fig. 6 is a plan view of the mechanism for enlarging or contracting the tables. Fig. 7 is a longitudinal section of the carriage; and Fig. 8 is a cross-section thereof, showing the same mechanism.

The same letters and numerals of reference are used in all figures.

The bed A is a solid rectangular casting,

resembling an open box. It maybe stifiened by transverse partitions a. Lugs a are cast integral with the bed, projecting from each side andat oppositely-disposed points, preferably in line with the partitions a. In a hole in each lug is stepped a standard B, which is preferably a stout round rod threaded at its lower end, and firmly fastened in the lug by the nuts I). A head or collar integral with the rod may take the place of the lower or upper nut, respectively, or any other convenient mode of fastening the standard may be adopted. The standards are preferably four in number, and rise parallel with each. other to a suitable height above the bed. Their upper ends pass through eyes in a plate C, which can be adjusted vertically on the standards, preferably by means of nuts 0 above and below the eyes, the upper portion of the standards being screw-threaded to receive said nuts. The plate supports a vertical cylinder 1, preferably cast in one piece with it. A head 0' is secured to the upper end of the cylinder, and within it is fitted a piston D, whose piston-rod D passes downward through a stuffing-box c beneath the plate 0. To the end of the piston-rod is fastened a movable cross head E, consisting of a plate having perforated lugs e, that slide on the standards B and guide it in its vertical movements. A box F is secured on the under side of the plate by means of bolts passing through a flange f. The sides of the box may slope inward slightly, as shown, and its bottom is composed of a sheet of rubber or other suitable flexible material F, which is clamped to the edge of the box by means of a frame f and bolts or screws f A pipe G, passing through the cross-head E to the interior of the box F, enables the box to be filled with water or other liquid, after which a valve in the pipe can be closed to confine the liquid and cause it to form an incompressible but mobile backing for the flexible sheet F. When this platen is forced down upon the sand in a flask, the sand is packed tight-1y around the pattern with an even uniform pressure, due to the fact that the sheet F will yield where the sand is harder on the pattern nearer the surface, and

will bulge out and follow up the sand in those places where it is softer or deeper, thereby packing it to the same density at all points.

In-order to raise and lower the platen and cause it to exert a pressure upon the sand, a pipe H conveys compressed air, steam, or other fluid under pressure to the cylinder C through the branches 7th, one delivering the fluid-pressure above the piston D and the other underneath it. The fluid is directed into the desired branch pipe by means a fourway cock H, located at the junction of the branches with the main pipe. By turning the cock to one position the piston and platen will be raised. On turning the cock to another position the piston will be depressed, forcing the platen down upon the mold. The construction and operation of the four-way cock are so well known that they need not be described here in detail. A gage I indicates the pressure in the cylinder above the piston.

Turning now to the devices by which the flasks are brought under the platen and removed therefrom, it may be said that this comprises a reciprocating carriage, on which are erected tables for supporting the flasks, the carriage being moved by a piston in a longcylinder, and the tables being adj ustable in length. Inside of each table is a vertically-moving cross-head, to which the pat tern is attached.

In the drawings, the carriage K appears as arectangularopen frame or box having projecting flanges is along the lower edges of its.

sides, which are received in grooves a formed along the upper edges of the sides of the bed A, andserving as ways in which the carriage slides. WVithin the bed is a cylinder A of suitable length, disposed longitudinally of the bed, and preferably cast integral therewith. A piston in the cylinder is provided with a piston-rod L, which extends through a slot a inthe end ofthe bed, and is secured to an arm is, depending from one end of the carriage vK. A pipe M conveys steam, compressed air, or the like to a four-way cock M, which directs it into one or the other of two branches m m, leading, respectively, to the front and rearv ends of the cylinder A, the exhaust-fluid escaping through the branch m The spindle of the valve Mextends out through the bed A, and is provided with an upright rock-arm M and a horizontal one M By manipulating the cock M the carriage. K,

can be reciprocated to bring either of the tables N under the platen.

Each table is composed of two end portions 12 n, separated by an intermediate removable portion n. The end portions consist of boxes having two sides, one end, and a bottom, the latter extending beyond the sides to form flanges 12 that fit into the grooves 78, formed along the inside of the carriage K at its upper edges. Depending from the bottom of each portion n 'n is a lug 01. in which is a screw-threaded hole, one having a right-hand and the other a left-hand thread. A shaft 0 extends longitudinally through the carriage,

screw is rotated.

being suitably journaled in bearings in the ends of the carriage and in its transverse stiffening-webs k The shaft is reduced in diameter at one end, as shown, from a point about midway of the table N, andis screwthreaded on both the larger and smaller portions, the threads being alternately right hand and left hand, as shown. This screwshaft engages the lugs n on the several end portions of the tables, the reduced diameter of the end of the shaft permitting the inner lug n to slip freely over it when the parts are assembled until it reaches its own larger thread. The shaft may be provided at one end with a squared portion, as shown in Fig. 5, for the application of a wrench or crankhandle to rotate it when the tables are to be altered in size. might at times require considerable power I prefer the construction illustrated in Figs. 6, 7, and 8, in which is shown an arrangement of gearing for rotating the shaft.

At some convenient point on the shaft, preferably between the webs W, a worm-gear o is secured to it, which meshes with a worm 0 on a transverse shaft 0, suitably journaled in the sides of the carriage. One end of the shaft 0 protrudes sufficiently to allow a removable winch or crank-handle O to be applied to it .when desired. Upon turningtheworm-shaftO the screw-shaft 0 will be rotated and the end portions of the tables will be separated or caused to approach each other simultaneously, according to the direction in which the When the parts have been properly adjusted, they can be clamped in position by means of the set-screws k impinging upon the flanges 01 The intermediate removable portions n have no bottoms nor any flange to enter the grooves They are made in sets of different widths, corresponding with the different sizes to be given to the tables. They are fastened to the end portions by bolts that pass through registering-lugs formed on the meetingedges of the end portions and removable portions, as clearly shown in Figs. 1 and 2. The top of the table is a plate N, and may be provided with a depending flange n to fit over the outside of the portions 71 n. Plates of various sizes are necessary, and in each is cut an aperture n corresponding with the shape of the pattern, since the table-top operates as a strippingplate, through which the pattern isprojected and Withdrawn.

The pattern is fastened on a platform P, a set of which is provided of different sizes corresponding to the sizes that can be given to the tables. This platform P is removably secured to the upper ends of posts 19, which rise from the ends of a cross-head P, arranged to slide in vertical guides Q on the inside of the carriage K. The posts 19 pass up between the bottoms of the two end portions 11. n of the table alongside of the removable portions 01. The cross-head may be suitably cut away to avoid striking the screw 0 when raised. The

travel of the cross-head must be enough to withdraw the pattern Z from the mold.

To operate the cross-head, it is provided at each end with a wrist-pin p, which projects through a vertical slot 70 in the side of the carriage K. Each pin is connected by alink 'r'with an arm 1 of a T-shaped rocker R, keyed 0n the end of a rock-shaft R ,which is mounted in bearings in the sides of the carriage across which it extends. A second rock-shaft S is arranged transversely of the carriage near the rock-shaft R, and is provided with a leverhandle 8, and a rock-arm s',which is connected by the link s with another arm 2 of the rocker R. Upon depressing the handle 3 the crosshead P will be lowered, and vice versa. The

upright arm 3 of the rocker R is preferably connected with the corresponding arm of the rocker at the opposite end of the carriage by means of a rod T, which is rendered adj ustable in length by a turn-buckle t. This connecting-rod enables the attendant to withdraw one pattern and raise the other simultaneously from either end of the machine.

I prefer to provide but one banking-frame U for the two tables, though it is evident that two may be used. To render one frame available for both tables, it is support-ed on slides V, secured to the inner sides of the standards B and extending parallel with the bed A. The slides consist, preferably, of bars grooved on their inner faces to receive the blocks to, adapted to slide in the grooves. From each block projects a pin 011 which is fulcrumed a lever U, one end of which is pivoted to the banking-frame U at about the middle of one side. The other end of the lever carries an adjustable counter-balance u, the two being preferably united by a bar 10 On one side of the bankingframe are provided handles a The frame itself is merely a rectangular boX with no top or bottom, preferably slightly smaller at the bottom, as shown. Pins it project downward from its lower edge to enter holes in the flask and cause the frame to register properly therewith. The construction' shown and described permits it to be moved from one side of the compressing apparatus to the other, and to be raised and lowered at will. A lever TV is fulcrumed to the frame-work at some convenient placeas, for instance, one of the slides V-and is connected by a rod 10 with the horizontal arm M on the spindle of the four-way cock M. A downward movement of the rod causes the carriage to travel to the right, (see Fig. 1,) and vice versa.

To automatically arrest the motion of the carriage at any predetermined point, it is provided with tappets to strike the rock-arm M at the proper instant and close the valve M. To stop it at either end of its stroke, the rocker-arms 1 may be provided with toes 4, depending into the line of the upright rock-arm M When the carriage approaches the end of its movement, the toe strikes the rock-arm and turns the cock M into its intermediate in the middle of its travel with neither table under the platen, this can be accomplished by means of a tappet X, consisting of a lever pivoted to the side of the carriage at the proper point, and having a toe an adapted to strike the rock-arm M The tappet is held normally in position to operate by means of a spring m; but the workman can prevent it from acting by stepping on the treadle 50 and thereby holding the toe a: raised until it has passed over the rock-arm M The operation of my machine is as follows: The carriage K is placed at the middle of its stroke with neither table under the platen. The two patterns Zone forthe cope and the other for the dragare firmly secured to the platforms P, one of which is then raised to project the pattern above the table'top N. One part of the flasksay the cope-is then placed on the table around the pattern and is filled with sand. The banking-frame is then pulled out on the slides V and brought down upon the cope, its pins 10 entering suitable holes in the upper edge thereof. The frame is filled with sand. The lever \V is then moved to open the four-way cock M, whereby the carriage is automatically moved to bring the cope und'er the platen, the banking frame moving with it by reason of the blocks 1t sliding in the ways V. The table stops automatically when it reaches the proper position for the compressing apparatus to operate. The fourway cockl-I is then opened to admit fluidpressure above the piston. D, whichv forces down the yielding platen upon the sand in the banking-frame, pushing it down into the cope, and packing it firmly and with uniform end of its stroke to bring the drag under the platen. When the sand has been packed in this part of the flask, the carriage is returned to its central position, and the drag-pattern is withdrawn from its mold by depressing one of the levers 8, thereby elevating the copepattern again for the formation of a new mold. The connecting-rod T may be omitted and each pattern manipulated independently, if desired. The cope and drag can now be removed to the foundry-floor and united for pouring in the usual manner.

To prevent sand from falling into the car- The banking-frame IIO .riage and bed, they may be floored over ho low the grooves k a respectively, suitable 1. In a sand-molding machine, the combination, with the bed A, of the cylinder A, cast integral therewith, a stationary compressing apparatus erected on' the bed at or near its middle, a carriage supporting the molds and sliding on the bed, a piston in the cylinder, connected with said carriage, and a four-way valve controlling the flow of fluidpressure to the cylinder to cause the molds to move under and away from the compressing apparatus at Will of the operator, substantially as described.

2. In a sand-molding machine, the combination, with the bed A, having the cylinder A longitudinally arranged therein, of a stationary compressing apparatus supported by said bed, a carriage for the molds, sliding on the bed, a piston in'the cylinder, connected with the carriage, a four-way valve controlling the flow of fluid-pressure to the cylinder, a handle for operating the valve at the will of the operator, and devices moving with the carriage, adapted to operate the valve at predetermined points in the travel of the carriage, substantially as described.

3. In a sand-molding machine, the combination, with the bed A, containing the cylin der A, of the carriage K, sliding on the bed and connected with a piston in the cylinder, the valve M, controlling the admission of fluid-pressure'to the cylinder and having its spindle provided with the upright rock-arm M and tappets attached to the carriage and adapted to strike the arm M substantially asdescribed.

4. In a sand-molding machine, the combination, with the cylinder containing a piston, of a valve controlling the admission of fluid-pressure to the cylinder and a carriage connected with the piston and carrying the lever X, having the toe w and the spring w for holding it normally in position to operate the valve, substantially as described.

5. In a sand-molding machine, the combination, with the standards B, of the adjustable cylinder 0, the piston D, and piston-rod I), the plate E, sliding on the standards and connected with the piston-rod, the box F, secured to the under side of the plate and having inclined sides, and the flexible bottom F, clamped to the lower edge of the box by the frame f, substantially as described.

6. The combination, with the carriage K, of the table N, comprising two adjustable end portions 47,- n, each having two sides and one end, intermediate removable portions 17., and

a removable flat top having an aperture for the passage of the pattern, substantially as described.

7. The combination. with the carriage K,

vhaving the grooves 762, of the tables having end portions 07. 01, provided with flanges n to slide in the grooves R and intermediate removable flangeless portions 01, substantially as described.

8. The combination, with the carriage K, of the tables for supporting the flasks, consisting of adjustable end portions n n, a set of intermediate removable portions n, and a set of removable tops N, substantially as described.

forth.

10. The combination, with the carriage K, of the cross-head P, having posts 1 and platform P, the table N, comprising two end portions n a 011 either side of the posts 19, and

intermediate portions 07., adjacent to said posts, and means for adjusting the end portions, substantially as described.

11. Thecombination,withthecarriageK,of two vertically-movable cross-heads P, two rock-shafts R, carrying rockers R, having arms 1, 2, and 3, two rock-shafts S, with their handles and rock-arms, and an adjustable rod T, connecting the upright rocker-arms 3, substantially as described.

12. In a sand-molding machine, the combination, With the bed and cylinder,. of the valve M, Whose spindle has an upright arm M the carriage K, carrying the cross-heads P, and the rockers R for actuating said crossheads, one arm of each rocker having a toe 4, adapted to strike the arm M and automatically stop the carriage when it reaches the end of its stroke, substantially as described.

13. In a sand-molding machine, the combination, with the standards B, of the slides V, secured thereto, and a vertically-movable banking-frame U, supported on levers adapted to move along said slides, substantially as described.

14. In a sand-molding machine, the combination, with the standards B, of the horizontal grooved bars V, secured thereto, the blocks a, sliding in the grooves, the counterbalanced levers fulcrumed on said blocks, and the banking-frame U, pivoted to said levers, su bstantially as described.

THEODOR MISTELSKI. Witnesses:

F. WVEsTPHAL,

JoHN VON OHLEN.

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