US715964A - Molding-machine. - Google Patents

Description

No. 7|5,964. PatentedDec. I6, |902.

II. C. BRADLEY & T. H. GILBERT.

HOLDING MACHINE.

(Application led Feb. 10, 1902.) l

(No Model.) 3 Sheets-Sheet I.

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No. 7|5,964. Patentedl nec. le, |902.

.1. c. BRADLEY & T. H. GILBERT.

MOLDING MACHINE. (Application led Feb. I, 1902,)

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(No Model.)

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ms esvsns co, Pnorauwo., wAsnmmoN, D4 c No. 715,964. Patented 056.16, |902.

J. c. mmLEY a. T. H. GILBERT.

MOLDING MACHINE.

(Application med Feb. 1o, 1902.)

(No Model.) 3 Sheets-Sheet 3.

D El D ma uonms PETERS co, Hom-urna., WASHINGTON. o, c

' Y IIN-iran.' Stra-rias TATENT OFFICE."

Y JOI-IN C. BRADLEY AND TRUMAN H. GILBERT, OFBUFFALO, NEW YORK,

ASSIGNORS vTO PRATT da LETCHW-ORTH COMPANY, OF BUFFALO, NEW

YORK.

SPECIFICATION forming part of Letters Patent No. 715,964, dated December 16, 1902.

Application filed February' 10, 1902. Serial No. 93,302. (No model.)

T0 @ZZ whom it may concern,.- ard by suitable means-such as upper and Be itknown that we, JOHN C. BRADLEY and lower collars c, surrounding the standard- TRUMAN H, G1LBERT,'citizens of the United which is preferably cylindrical and provided States, and residents of Buffalo,in the county with set-screws c', passing through the col- 5 of Erie and State of New York, have invented lars and bearing against the standard. The 55 new and useful Improvements in Moldingupper end of the bearing-bracket extends Machines, of which the following is a speciforwardly from the standard and is provided iication. at its front end withY a vertical bearing D,

This invention relates more particularly to which constitutes a guide'for the mold-table 1o a molding-machine in which a Vertically-y in its vertical movement. n 6o movable mold-table is provided, above which E represents the moldtable,which may be vis arranged a frame carrying a device for of any suitable form adapted to support a pressing or ramming the mold and a device mold-blank of the usual well-known type, for drawing the pattern from the mold, said the table being shown in the form of a flat I5 frame being movable to bring either the` board or plate which is carried by the upper 65 ramming device or the pattern-drawing deend of a vertical stem e, which slidably envice into operative position over the moldgages in a vertical opening in the bearing D. table. f The table is raised and lowered, preferably,

The object of the invention is to provide a by a fluid -operated means ofA any suitable zo machine of this character of Very simple and construction. In the construction shown the 7o desirable construction, in which the mold lower end of the stem e, carrying the moldcan be rapidly formed and the pattern retable, is connected to the upper end of a botmoved quickly without injuring the mold. Vtomless cylinder F, which surrounds and In the accompanying drawings, consisting slides on an inner cylinder f, which at its z5 of three sheets, Figure 1 is a side elevation, lower end is secured rigidly tothe base-plate 75 partly in section, of al molding-machine emand is open at its upperY end. This arrangebodying the invention and showing the ment of the cylinders prevents any sand presser in operative position over themoldwhich falls from the mold-table from getting table. Fig. 2 is a front elevation, partly .in on vthebearing-faces of the cylinders.

3o section, of the machine, showing the pattern- Gr represents a supply-pipe for fiuid under 8o drawing device in operative position overth'e pressure, preferably compressed air, which is mold-table and connected to the pattern forY connected by a branch pipe g to the lower drawing the same. Fig. 3 is a plan View of 'vend of the inner cylinder f. The branch pipe the machine. Fig. 4 is a vertical sectional is provided with a controlling-valve g', prefi 35 elevation through the pattern drawing and erably a three-way cock. When the three- 85 rapping devices. Fig. 5 is a sectional View way cock is in one position, the supply-pipe through the controlling-valve for the opercommunicates with the branch pipe and comating-cylinder for the mold-table. Fig. b' is lpressed air is admitted to the inner cylinder,

a similar View of the valve controlling the which causes the outer cylinder and stem to 4o drawing and rapping cylinders. Fig. 7 is lift the mold-table. When the cockis turned 9o a fragmentary sectional elevation showing to another position, the branch pipe is conthe presser-frame about to be swung under nected with an exhaust-opening g2 in the its holding-spring. e valve-casing and the upper cylinder and table Like letters of reference refer to like parts are permitted to lower or fall. The mold- 45 in the several figures. table is preferably connected to the upper 95 A represents a base-plate of any suitable end of the stem by means of a universal ballform and adapted to be affixed to some suitand-socket joint H. The joint-socket, which able foundation; B, an upright or standard is secured rigidly to the under side of the rising therefrom, and C a bearing-bracket mold-table, is provided at its lower end with 5o whichis adjustable vertically on the standroo a plane or horizontal rim h, which when the mold-table is lowered rests dat upon the upper horizontal face of the bearing D and causes the mold-table to assume a horizontal position in the event of the same being tilted or inclined when the cylinder is raised. The socket fits the ball sufliciently tight to hold the mold-table horizontally, unless the mold is forcibly moved out ofits horizontal position.

I represents a gage-strip, which is preferably detachably and adjustably secured on the uppersurface of the mold-table at the rear thereof byany suitable means, such as clamps i. This strip forms a stop against which the mold-flask can be placed to insure the correct position of the same on the mold-table.

J represents the pressing or ramming device. It is preferably a fiat plate secured horizontally to the under side of one end of a frame K, which is swiveled on the upper portion of the vertical standard B, so as to swing horizontally to carry the pressing device to or away from a position vertically over the mold-table. In the construction shown the frame is provided with a central vertical bearing-sleeve, which loosely surrounds the standard and rests on a collar k, which surrounds the standard below the frame or arm and is adjustably secured to the standard by means of set-screws k', passing through the collar andbearingagainstthestandard. Theframe can swing about the standard on the collar, and to reduce friction bearing-balls k2 are arranged in grooves in the upper face ot' the collar and lower face of the bearing-sleeve.

7c3 represents a collar secured to the standard above the frame to prevent upward movement of the frame when the mold is raised against the pressing device. By means of the adjustable collars k and 7c3 the frame can be adjusted to any desired distance above the mold-table to accommodate different-sized ilasks for different classes of work.

7a4 represents a spring secured at its upper end to a collarkat the upperend of the standard and having its lower end extending down in a position to engage yieldingly on the upper face of either arm of the swinging frame when the same is swung beneath the spring. The side edges of the frame-arms or the spring, or both, are beveled, as indicated in Fig. 7, so that when one of the arms engages the spring it is strained slightly and bears on the arm with sufiicient force to hold the frame from swinging. The spring acts to hold the arm of the frame centrally over the mold-table.

The device for drawing the pattern from the mold is carried at the end of the swinging frame K opposite to that at which the pressing-plate is located and is constructed as follows:

L represents a hollow tube or sleeve which is vertically movable in a guide-bearing l, provided therefor at the end of the frame and which is provided at its lower end with a chuck, which is adapted to take hold of a part secured to the pattern.

m represents a chuck-stem which is arranged vertically in the hollow drawingsleeve and is provided at its lower end with an enlargement fm', which is split or divided to form jaws and is provided with an external conical face, which coperates with an internal conical face m2 in the lower end of the sleeve L. The lower split end of the chuckrod is provided with a conical cavity m3, in which is adapted to engage a conical pin N, secured to the pattern. In practice the patterns are provided with said conical pins, which may be secured in any suitable manner-for instance, by screwing the same into screw-threaded holes in the patterns. The chuck-stem extends upwardly through the upper end of the drawing-sleeve and has pivoted thereto an operating-lever O, which is provided with a cam-shaped or eccentric portion O at its end which bears on the top of the sleeve. When the outer end of the lever is swung upwardly, this eccentric portion bearing upon the upper end of the drawingsleeve raises the chuck-stem relative to the sleeve, tightly wedging the chuck-jaws in the conical end of the drawing-sleeve, which causes the jaws to clamp tightly on the conical pin N, secured to the pattern.

O2 represents a hook secured to a collar O3 on the upper end of the drawing-sleeve adjacent to the inner end of the lever and adapted to engage with a shoulder OL on the lever when the latter is turned or swung downwardly. When the shoulder engages the hook, the pivotal movement of the lever is opposed, and further downward pressure of the lever will force the chuck-stem down- .wardly to open its jaws to release the patternpin.

The duid-operated mechanisms for raising the drawing-sleeve to draw the pattern from the mold and for rapping or vibrating the drawing mechanism to loosen the pattern in the mold are preferably constructed as follows:

P represents a cylinder for the duid-operated rapping device or piston. It is rigidly secured to the end of the swinging frame adjacent to the bearing for the drawing-sleeve, as by a bracket secured to the lower end of the bearing and projecting laterally beneath the cylinder P. The cylinder Pserves as a support for the drawingcylinder Q, which is secured to the top of the cylinder P and preferably has an open upper end. An open bottomed cylinder q surrounds and slides vertically on the drawing-cylinder and is provided at its lower end with a lateral arm q', secured to the collar O3, in which the drawing-sleeve is vertically adjustable, as by set-screws q2. This adjustable connection between the drawing-sleeve and its operating-cylinder enables the former to be set nearer to or farther from the mold-table to facilitate its use with mold flasks or patterns of different heights.

Rrepresents a pipe which leads to the cylinder of the rapping device, and fr a branch IOO IIO

pipe leading therefrom to the lower or inner drawing-cylinder. The pipe R is supplied with iuid under pressure, preferably compressed air, by a flexible hose r', connected to the supply-pipe G and to the pipe R. At the juncture of the branch pipe r with the pipe R is a valve r2, Fig. 6, preferably a threeway cock, which controls the passage of the compressed air to both the drawing-cylinder and the cylinder of the rapping device.

The rapping device may be of any suitable construction in which a piston or the like is adapted to be rapidly reciprocated or vibrated by fluid-pressure. In the construction shown in Fig. 4 a piston 1o is mounted in the cylinder P and adapted to reciprocate therein and strike at its opposite ends-against hardenedsteel anvils192, secured in the opposite ends of the cylinder. 1931 4 represent ports leading from the fluid-pipe R to the opposite ends of the cylinder, and 19s a sliding valve which controls said ports. 196 represents a lever pivoted in an opening in theside of the cylinder and having one end projecting into a slot in the piston and having the other end projecting into a slot in the valve, the construction being such that when the piston is moved in one direction the valve is moved positively. 197198 represent exhaust-ports leading from the cylinder. When the piston is in its lower position, (shown in Fig. 4,) the valve is raised, and when the three-way cock r2, controlling the supply-pipe, is turned to open the pipe R compressed air enters the port 194 and the cylinder beneath the piston, raisingv the same until the exhaust-port 198 is uncovered and permits the escape of the compressed air. The upward movement of the piston shifts the valve, so as to close the inlet-port p4 and open the inlet-port 103, thus admitting air to the upper end of the cylinder and driving the piston down until the upper exhaust-port 197 is uncovered. Thus the piston is caused to reciprocate rapidly, striking at its opposite ends against the anvils and causing a vibration of the pattern drawing device. The ports of the three-way cock are so arranged that when the same is turned slightly from the position indicated in Fig. 6 the air is first admitted to the rapping-cylinder and the rapping device put into operation. By turning the cock slightly farther air is admitted through the branch pipe to the drawing-cylinder, which causes the outercylinder q to rise and lift the drawingsleeve and pattern attached thereto. While the pattern is being drawn ormoved upwardly out of the mold itis at the same time being rapped or vibrated to prevent any possibility of the pattern breaking the mold. The drawing-sleeve is guided and held in a true vertical line by its guide-bearing. The air may be exhausted from the cylinder q in any convenient way to permit it to lower. For instance, the cylinder is provided with a small hole g3, Fig. 4, which is covered by the lower cylinder Q, ex-

cept-when the upper cylinder g is in its highest position. v

S represents a spring secured at its upper end to the collar O3, to which the drawing- Sleeve is secured, and extending downwardly `beside the bearing for the drawing-sleeve.

When the latter is raised to its upper position, (indicated in Figs. l and 4,) the lower end of the spring snaps inwardly on the top of the bearing and holds the drawing-sleeve raised until the spring is disengaged from the top of the bearing. The drawing-sleeve is thus held up while the pattern is released from the chuck.

T represents a conical shield which is secured to the under side of the mold-table and surrounds the ball-and-socket connection between the stem and the table. The hood is provided with a lateral extension t, which projects rearwardly toward the standard over the bearing-bracket. Preferably a supplemental substantially V-shaped shield t/ straddles the top of the bearing-bracket beneath the shield extension. These shields effectually prevent any sand which falls from the mold table from getting on the bearingbracket and into the bearing for the sliding stem. The cylinders for lifting the table are also preferably provided with an inclosing casing t2, which prevents the sand from comf ing into contact with the bearing-surfaces of the cylinders.

The operation of the machine is as follows: A pattern which has been provided with a conical drawing-pin, as above explained, is placed on the match section or board U of the mold, with the drawing-pin extending downwardly, as shown in Fig. l. One section it of the mold iiask is then placed on the match and sand filled in the same around the pattern. The sand ls roughly smoothed off, and the operator then turns the three-way cock g in the su pply-pipe for the table-operating cylinder so as to admit compressed air to the latter. The table is thus raised and ICO IIO

lthe mold-section, with the sand therein, carried up against the under face of the pressing or ramming plate, which presses the sand in the flask-section, forming the nowel or one part of the mold. After the first part of the mold hasbeen pressed` the three-way cock is turned to connect the branch supply-pipe with the exhaust-opening, which permits the air to escape from the cylinder and the moldtable to drop to its lower position. (Indicated in Fig. l.) A bottom board uf is now placed on the nowel and thelatter and match inverted by the operator and the match lifted off of the nowel. Parting sand is then sprinkled on the upper surface of the nowel and the other section of the flask placed on the nowel. Sand is filled in the fiask-section to make the cope or other part of the mold, and the table is again raised to press the cope and then lowered.

The cope-section is then lifted.

with the drawing-pin projecting upwardly, as shown in Fig. 2. The operator then swings the frame around so as to bring the patterndrawing sleeve over the pattern and lowers the sleeve by disengaging the spring S from the top of the bearing Z of the drawing-sleeve. The sleeve gradually lowers and while lowering is guided by the operator, so that the jaws of the chuck m engage over the pin on the pattern. The lever O is then swung upwardly to clamp the pin tightly in the jaws of the chuck, after which the operator turns the three-way cock r2 sufficiently to admit air to the rapping-cylinder. The rapper immediately commences reciprocating and vibrates the drawing device sufficiently to loosen the pattern in the mold. The valve is then turned farther and air admitted to the drawing-cylinders, which causes the upper cylinder to move upward, carrying the drawing-sleeve upward until the spring S thereon snaps in on the top of the bearing for the drawingsleeve and holds the latter in its raised position. The pattern is then disengaged from the drawing-rod by swinging the lever O downwardly, as above described. The hole which is made in the mold by the drawingpin N on the pattern can be stopped before the casting is made,- or the projection which is formed on the casting, if the hole is not stopped, can be easily removed from the tinished casting.

The machine is especially adapted for quick work whether the molds are formed from single or gated patterns. The patterns are readily provided with a drawing-pin. The lnold can be quickly formed and the pattern drawn rapidly and accurately without injuring the mold.

The ball-and-socket joint, as described7 between the mold-table and the vertically-movable stem carrying the same permits the table to tilt, and in the event of the sand being unevenly placed in the iask, so that it is higher at one side than at the other, when the sand is brought into contact with the pressing-plate the mold-table is caused to tilt, and excessive pressure is not brought to bear on the higher portion of the sand, but the pressure is evenly distributed throughout the iiask. Vhen the table is lowered, it is again returned to its horizontal position by the engagement of the joint-socket with the top fiat face of the bearing D.

Ve claim as our invention-u l. The combination of a mold-support, a pressing device, a pattern drawing device adapted to be attached to the pattern and support the same, a support carrying said pressing device and pattern-drawing device, one of said supports being horizontally movable relative to the other to place either the pressing or drawing device in operative position over said mold-support, and means for moving one of said supports vertically toward the other, substantially as set forth.

2. The combination of a mold-support, a

pressing device, a pattern-drawing device adapted to be attached to the pattern and support the same,a frame carrying said pressing device and pattern-drawing device and movable to carry either of said devices into operative position over said mold-support, and means for causing a relative vertical movement of the mold-support and pressing device toward each other, substantially as set forth.

3. The combination of a mold-support, a pressing device, a pattern-drawing device adapted to be attached to the pattern and support the same, a frame carrying said pressing device and pattern-drawing device and movable to carry either of said devices into operative position over said mold-support, and means for moving said mold-support toward and from said pressing device, substantially as set forth.

4. The combination of a mold-support, a pressing device, a pattern-drawing device adapted to be attached to the pattern and support the same, a frame carrying said pressing device and pattern-drawing device and movable to carry either of said devices into operative position over said mold-support, and means for causing a relative vertical movenient of said mold-support and pattern-drawing device away from each other to draw the pattern from the mold, substantially as set forth.

5. The combination of a mold-support, a pressing device, a patterndrawing device adapted to be attached to the pattern and support the same, a frame carrying said pressing device and pattern-drawing device and movable to carry either of said devices into operative position over said mold-support, and means for raising said pattern-drawing device away from said mold-support to lift the pattern up out of the mold, substantially as Set forth.

6. The combination of a mold-support, a pressing device, a patterndrawing device adapted to be attached to the pattern and support the same, a frame carrying said pressing device and pattern drawing device and mounted to turn about a vertical axis to carry either of said devices into operative position over said support, and means for moving said mold-support vertically toward said pressing device, substantially as set forth 7. The combination of a mold-support, a pressing device, a pattern drawing device adapted to be attached to the pattern and support the same, a horizontally-movable frame arranged above said mold-support and carrying said pressing device and pattern-drawing device, said frame being movable to carry either of said devices into operative position over said mold-support, means for moving said pattern-drawing device vertically on said frame, and means for moving said mold-support toward and from said pressing device, substantially as set forth.

8. The combination of a mold-support, a

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pressing device, a pattern-drawing device adapted to be attached to the pattern and support the same, a frame arranged above said mold-support and carrying said pressing device and pattern-drawing device and movable horizontally to carry either of said devices into operative position over said moldsupport, means for raising and lowering said mold-support toward and from said pressing device, and Huid-operated means for raising said pattern-drawing device, substantially as set forth.

9. The combination of a mold-support, a pressing device, a pattern-drawing device adapted to be attached to the pattern andl support the same, a frame carrying said pressing device and pattern-drawing device and movable to carry either of said devices into operative position over said mold-support, means for raising and vlowering said moldsupport toward and from said pressing device, means for raising said pattern-drawing device to draw the pattern from the mold, and a rapping device carried by said frame and adapted to rap said frame while said pattern-drawing device is being moved to draw the pattern, substantially as set forth.

10. The combination of a pattern-drawing device provided with means for attaching it to the pattern, means for operating said device to draw the pattern, a rapping device, and a single device which controls the actuating medium for both said operating means for the drawing device and said rapping de` the operation of the rapping device before pattern, a fluid-operated rapping device, and a single valve for controlling the iiuid to said means for moving the pattern-drawing device and to said rapping device, substantially as set forth.

13. The combination of a drawing-rod provided with jaws adapted to grasp a part secured to the pattern, a part associated with said rod and engaging said jaws, means for causing a relative longitudinal movement between said rod and part whereby said jaws are moved to grasp the pattern, and means for moving said rod to draw the pattern, substantially as set forth.

14:. rlhe combination of a drawing-rod provided with jaws adapted to grasp a part secured to the pattern, and having inclined faces, a sleeve surrounding said drawing-rod and engaging said inclined faces of the jaws, means for moving said drawing-rod longitudinally relative to said sleeve whereby said jaws are forced toward each other and grasp` the part secured to the pattern, and means for moving said rod to draw the pattern, substantially as set forth.

15. The combination of a drawing-rod provided with jaws adapted to grasp a partv secured to the pattern and having youter inclined faces, a sleeve surrounding said drawing-.rod and engaging said inclined faces of the jaws, a cam pivoted to the upper end of the rod, a guide-bearing in which said sleeve is vertically movable, and means for raising said sleeve in said bearing, substantially as set forth.

16. The combination of a vertically-movable stem, a mold-table supported and guided by said stem, means for moving said stem, a pressing device arranged opposite to said mold-table, and a universal joint connecting said table and stem so as to permit the table to tilt on the stem, substantially as set forth'.

Witness our hands this 3d day of February, 1902.

JOHN C. BRADLEY. TRUMAN H. GILBERT.

Witnesses:

F. H. BULLARD, W. C. HOUCK.

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