US2601656A - Foundry machine - Google Patents

Description

June 24, 1952 L. c. YOUNG 2,601,656

FOUNDRY MACHINE Filed July 19, 1949 2 SHEETSSHEET l INVEN TOR.

y Z 6 /0 y wan/Z 6 W/M June 245 1952' 1.. c. YOUNG 2,601,656

FOUNDRY MACHINE Filed July 19, 1949 2 SHEETS-SHEET 2 g 5 v y INVENTOR.

Patented June 24, 1952 UNITED OFFICE 2,601,656 FOUNDRY MIACHINE Lester C. Young, Cleveland, Ohio, assignor to Spo, Inc., a corporation of Ohio Application July 19, 1949, Serial No. 105,554

8 Claims. 1

This invention relates to molding machines. and more particularly to jolt molding machines adapted to aid in compacting the molding sand or other material.

In jolt molding machines, the jolt table is raised by a. fluid pressure lifting means which comprises a. piston element and a cylinder element adapted to be extended relative to each other and defining an extensible fluid pressure chamber. For the raising movementof the jolt table, fluid under pressure is introduced into the extensible fluid pressure chamber to raise the jolt table relative to an anvil upon which the jolt table rests in its lowermost position. In operation, the jolt table is raised a predetermined distance above the anvil, and then the fluid is exhausted from the fluid lifting chamber, which permits the jolt table to fall by gravity and strike the anvil for producing a jolting operation to aid in compacting the molding sand or other material in the molding flask or other container. In prior constructions, as the piston and cylinder move extensively relative to each other for raising the jolt table, there is an exposure of the relatively movable portion of the piston. This exposed portion of the piston is normally subjected to a considerable amount of molding sand or other foreign abrasive materials which comes in contact therewith during the jolting operations of the molding sand and which, if not prevented, causes a great deal of excessive wear. My Patent No. 2,456,663 teaches a construction which will protect such exposed portion. This invention provides a combination of piston and cylinder combinations to produce a jolting action and a continuous movement for squeezing. This invention incorporates all of the advantages shown by my prior patent, and in addition thereto provides for one piston and cylinder combination which is totally enclosed, and therefore shielded from all abrasive action of room dirt.

An object of the invention is to provide a jolt machine construction which encloses the relatively movable wall surfaces of the lifting means during the jolting operations.

Another object of this invention is to effectively combine a jolt and squeeze action together in one foundry machine.

Another object of my invention is to provide spaced guide surfaces acting between the relatively movable members of a jolt machine, to provide smooth jolt movement and prevent "galloping action. 7

Still another object of my invention is to provide a jolt machine construction which can tolerate a large amount of wear between the relatively movable parts, and yet have a smooth, nongalloping jolt action.

.Other objects and a fuller understanding of my invention may be had by referring to the following description and claims, taken in conjunction with the accompanying drawings, in which:

Figure 1 is a transverse cross-sectional view of a jolt molding machine base unit employing the features of this invention; 6

Figure 2 is a sectional view similar to Figure 1 of a modification of the base unit employing the features of this invention;

Figure 3 is a broken away sectional view taken at a angle with respect to Figure 2 illustrating the air intake lines into the extensible chamber of the embodiment illustrated in Figure 2;

Figure 4 is a type of foundry equipment machine into which the base units of Figures 1 or 2 may be incorporated, the machine being of the roll-over type; and

I Figure 5 is a stationary floor type of foundry machine into which either of the base units of Figure 1 or 2 may be built.

With reference to the Figure 1 of the drawing, my jolt machine comprises generally a base ID, a

jolt table 24, a fluid pressure lifting mechanism comprising a piston l8 and a cylinder 29 interposed between the base and the jolt table 24, and an outer tubular shell l'l projecting upwardly from the base and terminating in an anvil [2 against which the jolt table strikes to aid in compacting the molding sand or other materials.

The base [0 may be of any suitable shape and has a relatively flat bottom adapted to rest upon a suitable foundation. The outer tubular shell I I projects upwardly with respect to the base l0 and serves not only as an anvil against which the jolt table 24 may strike, but also as the protecting shield to prevent molding sand or other foreign abrasive substances from coming into the interior of the machine. The upper end of the anvil I2 is provided with a flat annular face [3 against which the jolt table strikes.

In the basic unit illustrated in Figure l of the drawing, the cylinder 29 is the inner portion of a central core member 14. The core [4 has an annular wall l5 defining a stationary piston mounted upon the base Ill.

The jolt table 24 is preferably constructed of a semi-steel casting and is disposed to rest upon the anvil 12 of the upper end of the tubular shell II in substantially a horizontal position. The jolt table 24 has preferably a flat upper surface 25 and has upon its underneath side three annular depending flanges or ribs to reinforce the construction; namely, an outer flange 26, an intermediate flange 21 and a. central flange which constitutes a cylinder It. This construction, and

' the action between the piston wall [5 and the cylinder I6 is similar to that set forth in Patent No. 2,456,663. The outer flange 26 extends downwardly from the marginal edge of the jolt table. The flange "21, projects 'downwardly'at an intermediateradial annular location andconstitutes'a hammer for striking the anvil. The flanges are preferably integrally formed with the jolt table and aid in reinforcing the jolt table whereby it may withstand the heavy shocks to which it is subjected during the jolting operation. T-he annular flange or extension 21, is substantiallyin alignment with the anvil I Z and is provided with a flat annular face 28 adapted to strike the anvil has a variable exhaust line 33 adapted to conduct exhaust fluid under pressure to exhaust port 34 leading into a chamber 35 formed within the shell II'. Thus, exhaust fluid will exit from the machine between the flat face I3 and the flat face 28 on the members H and 24, respectively, and blow room dust outwardly away from the machine.

The; ex haust plate 32,1andthepiston j8 define *anextensible'jolt'chamber'iis. Fluid under pressure is introduced into the extensible chamber '36 through means of a connecting series of conduits -31 suitably provided in the well-known I2 to effect compacting of the molding "sand or other material. The cylinder wall I6 is preferably integral-1v connected to h und ea h :side of the jolt table 24 and constitutes a reinforcingannular rib or extension for the jolt table. -Itis to he n ted" that th t re flan es sepa at fr m their-function of reinforcing the streng thtof the jolt. table, have additional functions inthatthe outer flange-26 operates asan apron toguard the operator from the anvil, the inner flange 2-'l"-has the, function ;of: a hammer for striking the'anvil l2, and the inner flangehas the function of the cylinder [6. The cylinder {l6 is not' used as a hammer and. thus; this construction avoids Deening of the cylinder which would otherwise occur the pylinder end were used asa hammer. The core L4 is closed across the top bywall l1, -andthe wallll; coactins w t the area of the table 25 within. the-'cy-lillder wall l- 6,"defin es qan extensible.. chamber 19-adapted to receive fluid end r. pr ssure- 'h s. flu d may e supp ed t and. exhausted from the chamber l 9 through a convenient line 20 and the table -24 may be raised '--w h re pe tto t c re 4 Gha -b r H m -ployed in the illustrated "embodiment of the invention as a squeeze" chamber to push the table 3! stead ly upw d t a c n tant. or "T acti n isremplo d man t es ofi un r machinery; such, for example; as the machines illuseted'in Fi u e and w e e n a u drymol is squ zed betwe n "Jolt t b e -4 an hook arms: 2 I. Thexdeseribed squeezeraction is separate from the jolt zaction heretofore.- referred to, pm; when thechamber Ill-is not in; service for squ ezin t i t n lls 15 nd h cylind "walls lfiiserveesguide means to aid in. assuring proper vertical reciprocatingymotion of the. table urin i t s op o In the-e bodiment o the inven on as. llustratedfin Figure 1, the cylinder 29 isa part of the pore] Q, and is stationary with respect to the base Hl. The piston 18 isadapted to reciprocate'vertically with n. the Cylinder -29. A piston'rod22 ex n t ou h t n ope in 2s in' he t p wall H and s's cu d b a u a eahs such,

for example, as bythe nut 3ll, to the table 24. -In

the-preferredembodiment, it is preferable to pror de a lar e ope n 2 a pla e e in 3 andai i e bu h n th e inbrder h t fluid pressure may be introduced between piston is and wall I! for return of the tableau when the unit isused ina roll over-draw machine.

The cylinder izll is "closed at the bottom byv exhaust plate 32whichv is more fullyset forth and explained in the application for Control Means for; J oltMolding MachinaSerialNo. 105,553, filed cpncurrer'itly herewith. The exhaust plate '32 manner. 7

When the joltltable 24 is resting upon the anvil 12', a'valve: rod 38 closes the exhaust line 33, and

anfna-take -.port,39 through the side Wall of the piston l8 connects the conduits 31 into the cham- -=ber'35. 'Thus, the chamber 36 is closed against exhaust, and is supplied from a suitable source .of fluid-pressure through a regulating system of 'yalyes,:a1l illustrated diagrammatically by the control assembly 40.

In operation, the fluid under-pressure enters into thezchamber. 36 until "sufilcientpressure is rbuiltup .tdpush the piston l8 and the rod 22 upwardly and-movethe table 24 off of theanvilvlz. :When the piston l,8 movesupwardly, however, the "valve rod fiil 'is 'pu-lledout of the. exhaust linei'33 and 1 thepressure within the chamber :36 i is reducedby exhausting the fluidout through the port 3.4,andthus the jolt table'is permitted'to idrjop byegravity'and' strike the anvilifor effecting the -jo-lting operation to aid: in 'scompactingxthe moldine sandior othermaterial.

The internal'walls of the cylinder F29: and the walls of the piston l 8i may be conveniently. lubricated by: supplying oil into the .compressedafluid entering, through thea'conduit 3! in anyxwellkl'lOWIllIIILIlIIBlKhllGh; for example, as the manner taught in the-Patent 2,456,663. Furthenia'guide pin oreguide' pins 51 may: bepprovided' for :pre-

venting rotation of the table: 2.4 during jolting'op- .eration. The pin 51 :has' its'supper' end securely connected to thejolt table 2.4 and has its remaininfiportion adapted to reciprocate withina :bu sh ing 5,3 t provided in a lateral extension 52 formed integrally with theanvil l2. 7

- In ="practice prior to Patent o. 2,456 ,663, jolt machines normally employed a stationary cylinder .with a piston secured'to the'bottom oft-he jolt table. Thepiston walls were thus exposed to the atmosphere whenthet jolt table was raised,

and therefore abrasive dust about u the" foundry could quickly wear the cylindereand piston. .Very 'soon, therefore, the jolt table :24 couldroek a are entirely enclosed within the; core (4, with no possibilityof room dust causing wear. The principles of Patent 2,456,653 are employed in the constructionand operation of piston l5 and cylinder l6, employed for the squeeze operations.

.dinally from the piston I8. points are employed to accurately guide the ver- This invention is an improvement thereon, and

I provides the combination of the inverted and enclosed piston and cylinders. .Also, the illustrated embodiment provides an improved combination in one machine to produce both a jolt action and a squeeze action. These actions 'arenot separable functions, but are sequential steps in the production of some types of foundry molds. The device of this invention provides both actions, and provides improved mechanism for producing the actions, in that all moving members are protected against dirt abrasion. Furthermore, the piston I8 is relatively short with respect to thecylinder 29, and the guide bushing 54 is spaced longitu- Thus, two spaced tical movement of the rod 22. As will readily be understood, a considerable amount of wear can take place between the piston I 8 and the cylinder 29, and also between the guide bushingx54 and the rod 22, before any appreciable amount of galloping action will be possible inrthe jolt table 24.

This improved guiding is provided by the'spaced guiding nature of the piston 18 andthe guide bushing 54. In addition, the cylinder 'IB and the piston wall I5 provide an outrigger bearing action which further tends to stabilizethe movement of the jolt table 24. In the preferred embodiment illustrated in Figure 1, the piston I5 and cylinder I6 are. employed as the principal guidin means. However, it is understood that the cylinder It may be removedin a straight jolt machine, and the improved enclosed piston I8 with the spaced guide bushing 54 will provide accurate jolt movement.

The Figures 2 and 3 of the drawings set forth a modification of the invention with. respect to Figure 1. In the Figure 2, a piston I I8 is secured to a piston rod I22, and rod I22 issecured to the stationary base of the machine. The table 24 carries a cylinder I29 which is provided with an opening 23 and a packing 3| and guide 54 described in connection with Figure 1 of the drawings.

In Figure 2, exhaust line I33 extends through the longitudinal axis of the piston rod holding the piston I I8 and exhausts into the area inside the outer shell II. Valve rod I38 is carried by the table 24 and operates to alternately open and close the exhaust line I33 as the table 24 reciprocates in a vertical direction. Fluid under pressure is fed to the chamber defined by the piston H8 and the table 24 through the system of conduits I31 and control assembly I 40 in substantially the same manner as described in connection with Figure 1.

In the embodiment of Figure 2, two spaced pistons I I5 are designed to operate in corresponding cylinders H6 and serve to guide the vertical reciprocation of the table 24. Compression chambers H9 at the top of each of the pistons II5 are supplied with fluid under pressure through line 20 for the purpose of raising the table 24 with a constant pressure for squeezing operations. During jolting movement of the table 24 the chambers II9 are not employed. Further, the plurality of cylinders, each with a separate longitudinal axis, as illustrated in Figure 2, prevents rotational movement of table 24. Thus a separate anti-rotation device is unnecessary.

In substantially all other respects the modification of Figure 2 is the same as the modification of Figure 1, and provides the spaced guiding action of the piston walls on the piston H8 and the bushing 54. Furthermore, the jolt piston and cylinder H8 and I29 are combined and are entirely enclosed in this embodiment also in order to prevent the wear of the relatively movable parts by abrasive dust in the room. I

Although the invention has been described in its preferred form with a certain degree of particularity, it is understood that the present disclosure of the preferred form has been made only by way of example and that numerou changes in the details of construction and the combination and arrangement of parts may be resorted to without departing from the spirit and the scope of the invention as hereinafter claimed.

I What is claimed is:

1. A molding machine. comprising relatively movable members including a base and jolt table, a shell projecting upwardly from said base and having at its upper end a striking anvil, said jolt table having on the underneath side thereof a surface for striking the anvil, a jolt piston and cylinder for raising the table relative to the anvil. saidjolt piston and cylinder defining an extensible fluid pressure chamber, aninlet into said extensible chamber for introducing fluid under pressure into said chamber to raise the jolt table relative to the anvil, an outlet from said extensible chamber through which fluid may be exhausted from said chamber for permitting the table to return by gravity and. strike the anvil, said outlet being controllable by the relative movements of the jolt piston and jolt cylinder, said jolt cylinder having internal walls and end closing means, said jolt piston having side wall surfaces fitting complementarily to said internal cylinder walls, piston rod means of smaller diameter than said jolt piston, said end closing wall means having an opening therethrough, said piston rod passing through .said opening, said piston rod being secured to one of said relatively movable members and said jolt cylinder being secured to the other of said relatively movable members, and outrigger squeeze piston and cylinder means laterally spaced and axially coextensive over at least a part of the length thereof with respect to said jolt piston and jolt cylinder, said outrigger squeeze piston and cylinder means defining and extensible fluid pressure chamber, an inlet into said extensible chamber of the outrigger for introducing fluid under pressure into said chamber to raise the jolt table relative to the anvil, an outlet from said extensible chamber through which fluid may be exhausted from said chamber for permitting the table to return by gravity, fluid control means in said inlet and outlet to the cham .ber of the outrigger piston and cylinder means,

said control means being operable independently of the relative position of the outrigger piston and cylinder means, whereby the entire complementary sliding surfaces of the jolt piston and cylinder are enclosed and shielded against abrasive room dust, and the jolt table is guided for smooth jolt movement by the spaced guiding action of the outrigger squeeze piston and cylinder means. I

2. A molding machine unit comprising a base, a shell projecting upwardly from said base and having at its upper end a striking anvil, a table having on the underneath side thereof a surface for striking the anvil, first piston means supported and carried by the base and extending upwardly therefrom toward the jolt table, first cylinder means surrounding the first piston means, said first piston means and first cylinder means defining extensible first fluid pressure chamber vmeans for raising'the table relative to "the anvil, a fluid. line serving both as an outlet and an inlet for introducing fluid under pressure into said first chamber means to raise and lower the table with a steady movement relative to the anvil, fluid control means operating said inlet'and outlet to the extensible first fluid pressure chamber means, said fluid control means operating independently of the relative position of the table and the anvil; said first piston means being externally exposed whensaid first cylinder the first cylinder means is raised, said first piston 'means having an internal bore defining a second cylinder, aisecond piston operable in said second cylinder, said second .piston having alpiston' rod,

attached thereto and extending through the'end of said first piston and being secured to said table, said second piston and secondcylinder deflning a second extensible fluid pressure chamber on the side of said'second piston opposite,

said table, an inlet into'said second extensible chamber for introducing fluid under pressure into said second chamber to. raise the table relative to the anvil, an outlet fromsaid extensible "chamberthrough which fluid may "be exhausted fromsaid second chamber for permittin'gthe 'tableto return'by gravity'and strike the anvil, said outlet being opened and closed by the relativeimover'nents'of the secondpiston and the second cylinder, said second piston and second cylinder thereby being totally enclosed from con tact by abrasive'material.

'3. -A molding machine unit comprising, an upwardly projecting shell having at its upper end a strikinganvil, a tablehaving onthe underneath side thereof asurface for striking the'an- 'vil, first piston and cylinder 'means operable within the shell and under the table forelevating the table 'a predetermined distance and maintaining the table in a raised position, said-cylinder being inverted over saidpiston' and'being movable to raise said table, said pistonportion being externally exposed when said cylinder'is raised, said exposed portion of the piston being shielded by the shell, said piston having aninsaid second piston and cylinder. tojolt the table,

and air inlet and outlet means in saidfirst cylinder controlled independently of the relativeiposi- -tion ofsaid first piston and cylinder for producing asteady and continuousraise of the table.

4i.v A molding machine comprising, a bas'e,'a piston supported and carried'by the baseiand extending upwardly therefrom, a: cylinder surrounding the piston, a jolt table carried by said cylinder, said piston and cylinder defining "an extensible fluid pressure chamber; fluid inlet and outlet means for injecting fluid into said extensiblefluid pressure chamber and exhausting same to provide a squeeze action movement of said table, said pistonv having a vertically 'extending internal boreyend wall means closing said bore, a jolt piston fitting in said bore, said jolt piston and bore defining. an extensible fluid pressure chamber, a piston rodpassing through .said end wall meansand interconnecting said table andjolt pistonpandlfluid pressure control -means withinletandoutlet lines leading 'to: said chamber defined by the jolt piston and the bore, said fluid pressure control means being governed by the relative position'of the jolt piston and the bore in which it operates.

5. -A molding machine comprising relatively movable members including a base and a jolt table, a shell projecting upwardly from said base and having at its upper end a striking anvil, said jolt table having onthe underneath sidethereof a surface for-striking the anvil, a jolt piston and jolt cylindersurroundirig the jolt piston for raising the table relative to the" anvil, said jolt piston and jolt cylinder defining an-exten'sible fluid pressure chamber, an inlet into said extensible chamber for introducing fluid under pressure into said chamber to raise the jolt table relative to the-anviL'an outlet from said extensible chamber through which fluid maybe exhausted from said chamber for permitting the table'to return by gravity and strike the anvil, said inlet and outi let beingcontrollable by the relative movements of the jolt-piston and the jolt cylinder, said jolt cylinder having internal walls and end "closing means, said jolt'piston 'havingside wall surfaces fitting complementarily to said internal cylinder Walls, and piston rod means of smaller diameter than said'jolt piston; said end closing wall means having "a guide opening therethrough, said piston 'rod being dimensioned to closely fit said opening, said piston 'rod being secured at one end thereof to the jolt piston, and passing through said guide opening'an'd secured'at'the. opposite end thereof to one of said relatively movable members, said 'joltcylinder being securedlto the other of i said relatively movable members, and outrigger piston and cylinder means extending axially coextensive with said jolt piston and cylinder over at least apart of-the length thereof and being spaced from said jolt piston and cylinder, said outrigger pistons and cylinder means including at least two piston means carried 'by one of said relatively movable portions and mating cylinder means carriedbythe other relatively movable portion, said outrigger piston'and cylinder means providing extensible'fluid' chambers for producing a continuous lifting force for said jolt'table, air inlet and outlet means into the extensible fluid chambers of the outrigger 'piston and cylinder means, control means for said air inlet and outlet means operable independently of the relative positions of' the relatively movable members, said outrigger piston and cylinder means providing lateral guiding surfaces for said jolt table during'jolt operation of the jolt piston and cylinder to provide smooth jolt movement and prevent rotary movement of the jolt table.

6. A molding machine comprising relatively movable members including a base and jolt table, a jolt piston and cylinder 'for raising the table relative to the anvil, said jolt piston and cylinder defining an extensible fluid pressure chamber, an'inlet into'said extensiblechamber for introducing'fiuid under pressure into'said chamber to raise the jolt table relative to the anvil,'an outlet from said extensible chamber through whichfluid may be exhausted from said chamber for permitting the table toreturnby gravity and strike the anvil, said outlet being controllable by the relative movements of the jolt piston and ,jolt cylinder, said jolt cylinder having'internal walls, said jolt piston havinglside wall surfaces fitting complementarilyto said internal cylinder walls, said piston rod being secured to one of said relatively movable members and said jolt cylinder being secured to the other of said relatively movable members, and outrigger squeeze piston and cylinder means laterally-spaced and axially coextensive over at least a part of the length thereof with respect to said jolt piston and jolt cylinder, said outrigger squeeze piston and cylinder means defining an extensible fluid pressure chamber, an inlet into said extensible chamber of the outrigger for introducing fluid under pressure into said chamber to raise the jolt table relative to the anvil, an outlet from said extensible chamber through which fluid may be exhausted from said chamber for permitting the table to return by gravity, fluid control means in said inlet and outlet to the chamber of the outrigger piston and cylinder means, said control means being operable independently of the relative position of the outrigger piston and cylinder means, whereby the entire complementary sliding surfaces of the jolt piston and cylinder are enclosed and shielded against abrasive room dust, and the jolt table is guided for smooth jolt movement by the spaced guiding action of the outrigger squeeze piston and cylinder means.

7. A molding machine unit comprising a base, first piston means supported and carried by the base and extending upwardly therefrom toward the jolt table, first cylinder means surrounding the first piston means, said first piston means and first cylinder means defining extensible first fluid pressure chamber means for raising the table relative to the anvil, a fluid line serving both as an outlet and an inlet for introducing fluid under pressure into said first chamber means to raise and lower the table with a steady movement relative to the anvil, fluid control means operating said inlet and outlet to the extensible first fluid pressure chamber means, said fluid control means operating independently of the relative position of the table and the anvil, said first piston means being externally exposed when said first cylinder is raised, said flrst piston means having an internal bore defining a second cylinder, a second piston operable in said second cylinder, said second piston being secured to said table, said second piston and second cylinder defining a second extensible fluid pressure chamber on the side of said second piston opposite said table, an inlet into said second extensible chamber for introducing fluid under pressure into said second chamber to raise the table relative to the anvil, an outlet from said extensible chamber through which fluid may be exhausted from said second chamber for permitting the table to return by gravity and strike the anvil, said outlet being opened and closed by the relative movements of the second piston and the second cylinder, said second piston and second cylinder thereby being totally enclosed from contact by abrasive material.

8. A molding machine comprising, a base, a piston supported and carried by the base and extending upwardly therefrom, a cylinder surrounding the piston, a jolt table carried by said cylinder, said piston and cylinder defining an extensible fluid pressure chamber, fluid inlet and outlet means for injecting fluid into said extensible fluid pressure chamber and exhausting same to provide a squeeze action movement of said table, said piston having a vertically extending internal bore, a jolt piston fitting in said bore, said jolt piston and bore defining an extensible fluid pressure chamber, means, connecting said jolt table to said piston, and fluid control means with inlet and outlet lines leading to said chamber defined by the jolt piston and the bore, said fluid pressure control means being governed by the relative position of the jolt piston and the bore in which it operates.

LESTER C. YOUNG.

REFERENCES CITED v The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,207,361 Battenfeld Dec. 5, 1916 1,547,056 MacNeill July 21, 1925 1,642,074 Lewis Sept. 13, 1927 1,932,803 Radigan Oct. 31, 1933 2,456,663 Young Dec. 21, 1948 FOREIGN PATENTS Number Country Date 547,749 Germany Mar. 29, 1932

Images