US1434508A - Mold-forming apparatus - Google Patents

Description

A. S. SHHVION.

MOLD FORMING APPARATUS.

APPLICATION FILED IA;I.27 I921.

,434,508. I v Patented Nov. 7, 1922.

4 SHEETSSHEET l.

A. S. SHIMON.

MOLD FORMING APPARATUS.

APPLICATION FILED JAN.27, 1921.

1,434,508. Patented Nov. 7 1922.

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MOLD FORMING APPARATUS.

APPLlCATION FILED JAN.271 1921.

Patented Nov. 7 1922.

4 sHEETs-sHEEI 3.

A. S. SHIMON.

MOLD FORMING APPARATUS.

APPLlCATlON FILED JAN. 27, IBZI.

Patented. Nov. 7, 1922.

Patented Nov. 7, 1922.

FATE NT 0 ALBERT S. SH'IMON, OF CHARDON, OHIO.

Mono-FORMING APPARATUS.

Application filed January 27,1921. Serial No. 440,410.

T 0 aZZ whom "it may concern.

Be it known that I, ALBERT S. SHIMON, a citizen of the United States, residing at Chardon, in the county of Geauga and State of Ohio, have invented certain new and useiiul Improvements in a Mold-F0rming Apparatus; 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 appertains to make and use the same.

The object of the invention is to provide mechanism for accurately positioning sand and mold facing material in the formation of molds to produce the necessary hardness or compactness thereof without being too hard, regardless of the irregularities or complex'ities of the outline of the pattern, without involving the work, time and skill necessary in the ramming of the mold under the present approved practice, so that the formation of the moldmay be accomplished by unskilled labor with an accuracy which is unattainable except under the most favorable conditions even by skilled labor in accordance with the present methods, owing to the fact that the sand is introduced into the mold box under such conditions as to find its way into each angle, crevice and corner of the pattern and is compacted as it is introduced under a uniform pressure so that the mass of the mold when completed is of uniform consistency; and with these objects in view the invention consists in a construction and combination of parts of which a preferred embodiment is shown in the drawings, wherein:

Figure 1 is a general view of the apparatus.

FigureQ is a vertical sectional view of the sand vbox showing the cover thereof in an inclined or screening position.

.Eigure 3 *is an enlarged view partly :in section of the sand conveyor and related parts. t

Figure 4 is a similar view of amodilied form of the conveyor branched to provide for depositing sand and facing material alternatively in the mold box.

Figure 5 is a detail transverse section on the :plane indicated by the line 55 of Fig :ure 3.

Figure 6 is a sectional view on the plane ndicated by the line 6-6 of Figure 4..

Figures 7 and 8 are detail sectional views respectively on the planes indicated by the lines 77 'and 8-8 of Figure 6.

Figures 9 and 10 are sections on the lines 9+9 and l010 of Figure 2, respectively.

The apparatus consists essentially of a conveyor 10, having a delivery nozzle ll, preferably of elbow or curved form as incliicateld connected by a flexible section 12 of hose or like material with a feed nozzle 13, the flexible section beingjointed or coupled as indicated at 14: and 15 respectively with the delivery and feed nozzles, and the feed nozzle being in communication with the supply box or reservoir 16 for sand or similar molding material, it being understood that when the device is in the form suggested in Figure d where sand and facing material may be supplied alternatively, a similar supply box or hopper 'for the facing material may be employed, but .as the construction thereof preferably is the same as that embodied in .the sand box, the detailed illustration of the shafts l8 and 1-9 carrying arms 20 and 21 designed to loosen the contents of the box and insure the free feeding thereof to the conveyor. The ends of these agitator shafts are provided with sprocket wheels 22 and 23 traversed by a chain 24, and one of the shafts, preferably that of the lower agitator as shown vin the drawing is provided with a crank arm 25 connected with the piston rod 26 of a cylinder 27 to which air or other motive agent under pressure may be admitted :;through the feed pipe .28 controlled by valve 29, to the end that when pressure is supplied the piston 30 in said cylinder will be reciprocated to oscillate .theagitators and thus loosen .the contents of the box.

Located in the delivery and feed nozzles .11 and 13 are injector nozzles 30 and 31. A Y -shaped coupling 30fcommunicates with the nozzle .30, and a similar coupling 31 vthe pressure conductor 33 communicates with the nozzle 31, as clearly shown in figures 1 and 3 of the drawings. A conductor 32, which is preferably of the flexible type, is adapted to be detachably connected to any one of the feed valves 32 of a pipe 32* forming a part of a compressed air supply system of that type to be found in the average foundry. This conductor 32 is connected to one of the branches of the coupling 30 to supply the nozzle 30 with compressed air, and a similar conductor 33 leads from the other branch of this coupling to one of the branches of the coupling 31 to supply the nozzle 31 with compressed air. The conductor 28 which supplies the motor with compressed air is connected to the other branch of the coupling 31% Needle valves 37 and 38 are disposed to regulate the discharge through the injector nozzles which respectively serve to drive the sand or other material through the nozzles and hence through the portion of the conveyor repre sented by the flexible section 12, the latter being employed to permit of the free move ment of the delivery nozzle in applying the sand to the mold box or to the surface of the pattern located therein. A regulating and cut off valve 39 is employed in connection with the pressure supply pipe 36 to regulate the supply of pressure to the conductor members 32 and 33, and obviously by the adjustment of the needle valves 37 and 38 an effective discharge through the injector nozzles may be provided to insure the proper progress of. the material from the reservoir through the conveyor and from the latter through the delivery nozzle to the mold box. The force with which the sand is projected from the delivery nozzle causes it to search out and deposit in the smaller anglesand crevices of the pattern. and inasmuch as this force can be regulated it is possible to pack the sand as it is thus delivered to the mold box so that when the latter has become filled there a uniformity of compactness of material constituting the mold which is conductive to the preparation of satisfactory castings which truthfully represent the pattern. Y

As indicated in Figure 4c, the conveyor may be branched, as indicated at 12 and 12 a common delivery nozzle 11 being employed and the feed nozzle being similarly duplicated as indicatedat 13" and 13 with the related parts constructed and arranged substantially as above described except that is similarly branched as shown at 33 and 33 and are connected with the supply by means of a switch valve 40 which is of the two-way variety adapted to supply pressure to either of the ejector nozzles of the feed nozzles 13" and 1.3", the branches 33 and 33 having bypass connections 28 and 28 fonsupplying pressure medium respectively to the cylinders which serve to operate the agitators respectively of the sand and facing material boxes or reservoirs.

The sand box is preferably provided with a screen cover 41 adapted to be arranged in an inclined position to permit of screening the sand as it is shoveled thereinto, and for this purpose being provided with a rack 4L3 by which it may be held at the desired inclination.

From the above description it will be obvious that by means of the apparatus it is possible to convey the sand or molding material from the place of supply to the mold box and to uniformly deposit the same with reference to the pattern located in the box under conditions insuring a proper formation of the mold without effort upon the part of the operator and without the 'loss of time incident to the ramming or compasting of the mold as in accordance with the present method, and that furthermore as the sand or other material is deposited a uniform compacting thereof is effected so as to insure a uniformity of solidity in the mold when completed which is ordinarily unattainable when the sand is packed as in the ordinary way. Moreover in the event that a variation in the firmness of the mold is desired it can be secured merely by a modification in the adjustment of the injector valyes, as for example when it is desired to provide a relatively harder surface for the iold' hen the body portion thereof or vice versa.

In the preferred embodiment of the inveution the pressure supply pipe 32 is pri- 'marily connected with the in ector nozzle 30 in the delivery nozzle, and pressure is then communicated to the injector nozzle 31 in the feed nozzle through a branch 33, so that a more or less reduced pressure is applied to the second named nozzle, not particularly for the purpose of reducing the pressure so far 'as the feed nozzle is con erned but especially to insure the maximum pressure at the delivery nozzle to provide for conducting the material through the delivery p1pe under such conditions as to avoid clogging or in other words to provide for the delivery of the material at least as rapidly as it can be supplied by the injector mechanism of the feed nozzle, and adjacent to the feed'nozzle the supply pipe for the air pressure is further branched as indicated at 28 to supply the motor by which the agitators are operated, a still further reduced pressure being sufficient for this purpose and permitting of the effective use of a common means of communicating pressure from the source of supply to the mechanism. Thus in practice the pressure from the source of supply is presented in a relatively graduated degree respectively to the delivery and feed nozzle and to the motor, with the maximum pressure applied to the injector nozzle in the delivery nozzle. Moreover as will be noted the pressure in the supply pipe is directed toward the injector nozzle in the delivery nozzle while the branch pipe 33 in effect rereives the back pressure incident to any resistance which may be offered to the column of air in its discharge from the nozzle 30, and to increase the relative pressure of the feed nozzle it is only necessary to increase the resistance at the injector 30 by the adjustment of the needle valve 3'7. Thus a relative application of pressure at the two nozzles to secure an effective joint operation thereof may be readily attained. to provide an effective supply of the material to the mold box.

In the form of the device illustrated in Figures &, 6, 7 and 8 the switch valve or gate 40 is preferably of a split or double winged type as indicated clearly in Figure 7 and the stem or spindle l8 thereof preferably carries a two way valve l l which controls the flow of air pressure respectively through the branch pipes 3-3 and 33 by which said pressure is conveyed alternately to the injector nozzles in the feed nozzles 13 and 13 of the double form of apparatus. Thus by the adjustment of the switch valve or gage by means of the handle 45 connected with said stem 43, the two way valve 41% is simultaneously adjusted to switch the pressure from the air supply to the proper :t'eed nozzle as the gate is reversed. The double or winged form of gate adapted to effectively close the branches of the conveyor as and by a motion suiiicientto reverse the position of the valve 4:4:- Thus a single operation sufficient to bring the parts into posit-ion to supply either sand or facing material.

Having thus described the invention, what I claim is:-

l. An apparatus for the purpose described having a reservoir for molding material, a conveyor having a Feed nozzle in communication with the reservoir and a delivery nozzle in communication through an intermediate flexible section with. the feed nozzle. injector nozzles arranged respectively in said feed and delivery nozzles and in communication with a source of fluid under pressure,.

said. injector nozzles being provided with regulating valves, and means for delivering the material from the reservoir to said feed nozzle, and consisting of agitators and pressure controlled means for actuating the same.

2. A mold. forming apparatus having a feed box, a conveyor in communication with the teed box and provided with a delivery nozzle, an ector nozzle located in the delivery nozzle and provided with a regulating valve, a conductor in communication with said inject-or nozzle and leading from a source of fluid under pressure, agitators arranged in said feed box, a pump cylinder having its piston operatively connected with said agitators and a valve connection between said cylinder and the conductor which supplies the injector nozzle.

3. A. mold forming apparatus having areservoir tor molding material, a conveyor having feed and delivery nozzles of which the former is in communication with the res ervoir, an agitator in the reservoir, :1 motor for actuating said agitator, injector nozzles respectively in said feed and delivery nozzles, and a pressure supply conductor in communication with a source 01 supply and in direct communication with the delivery injector nozzle, a branch conductor ext-ending from said supply conductor adjacent to the delivery injector nozzle to the feed in jector nozzle and a second branch extending :lrom the first named branch, a. point near the feed injector nozzle to the motor.

t. in an apparatus of the class described a reservoir, spaced feed and delivery nozzles, a flexible tubular conductor joining said nozzles, agitators in said reservoir, a fluid pressure motor tor actuating said agitators, injectors for each of said nozzles. and a source ct fluid under pressure common to the injectors and the motor.

In testimony whereof I affix my signature in presence of two witnesses.

ALBERT S. SHIMON.

Witnesses V. G. SAMPsoN, CHAS. De HENNING.

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