US1547056A - Molding machine - Google Patents

Description

July 21, 1925. 1,547,056

W. J. M NEILL MOLDING MACHINE Filed July 6, 1923 2 Sheets-Sheet 1 Dig 11mm? I 4 VIZ/111 July 21, 1925. 1,547,056

W. J. M NElLL MOLDING MACHINE Filed July 26. 9 3 2 Shaetsheet 2 Patented July 21, 1925.

N T T ES warrant. MA NErIQnpF wntrwnirosn, w r-sooirsritnsslenoniro F DERAL MALLE; ABLE COMPANY, or wnsr ALLIs, isconsin, n oonromrrron on WISCONSIN.

ommns MAQI i INE.

Application means 26, 1923. Serial No. 654,001.

To d ll whom it may concern: 1 I Be it knownfithatl, WILLIAM J. Mao- NEInmaJcitizen-of the Unit-ed States, resrd ing at VVauwatosa, in the county of Mil- Waukee and State: of Visconsin, have invented certain i new and useful Improvements in Molding Machines, of which the following is a specification. 1 w My invention relates toinolding machines of the kind in which the mold is jarred to settle and pack thesand, and which is also adapted to be subjected to afinal squeezing or ramming of the sand that has already 1 been packed in the mold. It has for its 010- ject to produce a machine of this type ofsimple construction and capable of jarring molds of large size and great weight." In the accompanying drawings Figure l'is a vertical sectional view of a molding machine embodying the preferred form of myinvention, the parts being in the positionsoccupiedwhilethe' piston is on its up stroke during the jarring or joltingof the=1nold 1 "Fig.2 is a similarview illustrating the positions occupied at the moment of exhaust during thejolting operation; I Fig. 3'is a central vertical view of the machine'illustrating the positions of the parts during the squeezing operation; and t Fig. 4. is a vertical sectional view of a Inachine of a different embodiment of myinvention. j Fig. 5 is a vertical sectional view illustrating the valves during the jolting movements ofthe mold,;the parts being in thesame pos tion as 'shownin Fig. 1 but drawn on a larger scale than they are in the last said figure. r

Referrlng to the drawings, 2 indicates the cylinder of the molding machinein which works the piston 3, which carriesat-its upper end the moldtable 1, It will be observed that but a single, simple cylinder and piston are employed for effecting both thejolting andthe squeezing operationsfand that these parts "are of relatively large size, the area of the piston onwhich actsthe motive fluid to effect various operations being sufiiciently great to give sufficient power tojthe machine to lift, during both joltin'g and squeezing operations, thelargest and heaviest mold that-it may be desired to support upon the table 4. The cylinder and piston are respectively provided with contact surfaces 5 which come into engagement as the piston falls during the jolting operations, thus producing the ars which effect the packing of the sand about the parts of the mold. Belowthe piston-is an airspace 6 to which leads a duct 7 through a port in the bottom of the cylinder, which duct serves the double purposeof an exhaust= passage, and a sup erably manually operated, and arranged to ply duct for the motive fluid used during control the supply of motive fluid to the cylinderz The duct 7 isformed'with a T 29, 29 which is mounted valve 30. This valve is acted upon by a spring 81 that norinally holdsthe valve against a face 32 and leaves uncovered anexhaust port 83, thus putting the air spaceg6 into communication with the open air. W'henever motive fluid is admitted to thespace 6- through the duct 7 by manipulation ofthe valve 10, the pressure of-suchfluid acting on the;valve 3O forces it away from the seat 32 and against the seat surrounding the exhaust port 33, closingthe latter,=and the parts'are held in this position so long as'pressure is on the cylinder through the duct 7 I A second duct 11- leads to avalve casing 12, which is preferably located on the inside of the piston 3. Through this duct is delivered the motive fluid employedfor imparting to the piston andmold the jolting movements. It is lo'cated'within the piston, passing through the wall thereof and is connected with a nipple 26 to which is secured a flexible hose 27 constituting part of a conduit connecting Wlth a source ofair orother.

motive fluid under pressure. In this conduit is-located ainanually controlled valve 24." The duct 11 passes through a slot 28 formed in the wall of the cylinder 2 at its upper edge which permits the necessary movements of these connecti ns' as the piston is'reciprocatedt Y A- port 13 leads through diaphragm 25 dividing the valve casing 12, the upper face of which diaphragm is formed into a valve seat 14 surrounding the port 13, with which engagesavalve 15 that, when closed, pre-' ventsthe'passa'ge of motivefluid from the ductll through )the port 13. 16 indicates ports through the end-ofthe piston 3'leading to the air space 6, through which the motive fluid that passes through the port 13 flows into the space below the piston.

A spring 17 bearing upon the valve 15 tends to hold it to its seat 14. This valve is provided with a stem 18 which passes through the lower end of the piston 3. By locating the valve casing 12 and associated parts within the piston 3 they are well protected from breakage and from dust and dirt. They are easily accessible by removing the mold table 4.

The valve 9 is also provided with a stem 19 that carries a cross, lift pin 20. Referring to the form of invention illustrated in Figs. 1 to 3 it will be noted that the stems 18 and 19 of the two valves are in alignment with each other and that the end ofthe stem 19 is located in a. socket 21 formed in the lower end of the stem 18.- Theopposite ends of the cross, lift pin 20 lie in slots 23 formed in the wall of'the socket 21. The slots 23 are of such length, and are so related to the cross pin 20, that when the head end 22 of the stem 19 is engaged by the stem 18,- as represented in Fig. 1, the pin or pins 20 are not directly engaged by the wall of I ends of the pins 20 being broken during the violent movements incident to the jolting operations of the machine.

I will now describe the operation of the machine shown in Figs. 1 to 3, assuming that a mold filled with sand has been placed upon the table 4 and is to be jarred or jolted. The control valve 10 in the conduit 7 is set to put the air space 6 below the valve into direct communication with the outside \air, eX- cept as that communication may be interfered with by the valve 9. The control valve 24 in conduit 11 is then opened, admitting motive fluid into the casing 12 The parts being in the position indicated in Figs. 1 and 5, with the piston at the lowest limit of its movement, the valve 9 seated, and the valve 15 off its seat, air will freely pass, through the ports 13 and 16, into the space 6 below the piston, lifting the latter. It will be noted that the air acts on the entire area.

' held down by the spring 17, its stem 18 resting upon the stem 19 of the valve 9, which is thus held to its seat, closing the exhaust passage and confining the compressed air in the space 6. At about the instant that the diaphragm 25 comes into engagement with the valve 15 and the latter becomes seated, thus cutting off the supply of motive fluid, the walls at the lower ends of the slots 23 come into engagement with the cross pin 20, and the valve 9 is lifted from its seat. The compressed air within the space 6 now rushes through the duct 7 into the open air, and the piston, with the load it carries, falls. As it does so the valve 15 moves downwardly and the valve 9 becomes seated. The seating of the latter, however, is not tight, and there is more or less leakage of air about the valve until the moving parts descend sufficiently far to cause the stem 18 of the valve 15 to strike the head end 22 of the stem 19 of the valve 9. When this engagement takes place the parts are moving rapidly and the blow struck is of considerable force, With the result that the valve 9 is tightly seated. At the same instant that valve 9 is thus tightly seated the valve 15 is opened, due to the ad vance of the piston. Motive fluid under pressure then freely passes from the duct 11 into the space 6 below the piston and the operations described are repeated. These reciprocations of the moving parts of the machine which cause the jolts and jars of the mold each time the piston falls and the surfaces 5 come into engagement, are repeated until the desired packing of the sand has been effected by the jarring operations.

When the squeezing operation is to be performed the control valve 10 is manipulated to cut off communication between the space 6 and the open air and to admit motive fluid through the duct 7. This unseats the valve 9 and acts on the piston and lifts it and.its load to cause the squeeze. If the control valve 24: for the line or duct 11 has not been closed before the control valve 10 has been manipulated as just described, no harm is done, because any air which may pass through the ports 16 and 13 merely passes back into the air line and no wastage occurs.

It will be seen that in the form of inventio'n just described the two valves 9 and 15 are connected, so that while having certain independent movements they operate one another, as has been described.

In the form of invention illustrated in Fig. 4 the valves are entirely independent and are not in line with each other. The stem 18 of the valve 15 is sufficiently long to engage with the lower end of the cylinder 2 andthus lift the valve from its seat as the piston approaches the lower limit of its movement. The stem 19 of the valve 9 eX- tends through the end of the piston 3 and has the cross pins 20 which it carries located within the chamber of said piston, sothat when the piston, in rising,approaches the upper limit of its movement the end of the piston engages directly with the said pins and causes the valve 9 to be lifted from the seat 8, permitting exhaust from'the space 6. The result of this arrangement is that the same sequence of movements that have already been described in connection with the other form of the invention for automatically effecting the jolting operations, are caused to take place.

lVhat I claim is g 1. In a jolt and squeeze molding machine, the combination with a cylinder, a piston working therein, and a mold table carried by the latter, of a supply duct for the motive fluid used for the jolting operations, another supply duct for the motive fluid used for the squeezing operations, these ducts leading below the piston, and the latter duct having tree communication with the open air, manually operated valves for controlling the supply through the said ducts, anautomatically operating valve for intermittently admitting and cutting ofi the supply of motive fluid to the first named duct during the jolting operations, and an automatically operating valve for controlling the exhaust through the second duct ar ranged to be operated by the movements of the piston during the jolting operations.

2. In a jolt molding machine, the combination of a cylinder and a piston movable therein, there being an exhaust port, and a supply port, respectively opening into the space between the ends of said cylinder and piston, a motive fluid supply duct leading to the supply port, a valve for closing the exhaust port provided with a stem arranged to be positively operated by the movement of the piston to move the valve from its seat when the piston reaches its upward limit of movement in the jolting operation, and another valve that controls the supply port and is provided with a stem arranged to be operated by the movements of the piston.

3. In a jolt molding machine, the combination of a cylinder and a piston movable therein, there being an exhaust port through the bottom of the cylinder and a supply port through the bottom of the piston, these respectively opening into the space between the. ends of said cylinder and piston, a motive fluid supply duct leading to the supply port, a valve for closing the supply port provided with a stem that extends toward the movable piston, arranged to be positively operated by the movement of the piston to move the valve from its seat, and another valve that controls the supply port provided with a stem that extends toward the bottom of the stationary cylinder and is arranged to be positively operated to open the valve for the supply port when the piston is below its upward limit of movement in the olting operation.

4:. The combination stated in claim 8, in-

eluding a spring that acts upon the valve for the supply port, arranged to close the said valve when the piston reaches its upward limit of movement in the olting operation.

5. The combination stated in claim 3, hav ing the stems or" the valves connected by a lost motion connection whereby the operations of the valve are positively secured by the movements of the piston.

6. The combination stated in claim 3 having the stems of the valves in alignment with each other,'one of them telescoping into the other, and connected to each other by a lost motion connection.

7. The combination stated in claim 3, including valve stems connected respectively with the valves, in alignment with each other and one telescoping into the other, and a spring acting through the said valve stems to hold the supply control valve to its seat.

8. In a jolt and squeeze molding machine, the combination of fluid-operated means for causing jolting operations, a duct through which motive fiuid is admitted for effecting the squeezing operation and through which the exhaust of the fluid used to cause the jolting operations takes place, the duct having an opening to the external air, a spring actuated valve arranged to normally close the duct and at the same time open the passage to the external air, this valve being adapted to yield and close the opening to the external air when motive fluid for effecting the squeezing operation is admitted through the duct, and an automatic intermittently operating valve for controlling the exhaust of the motive fluid through the said duct during the jolting operations.

WILLIAM J. MAoNEILL.

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