US1277745A - Molding-machine. - Google Patents

Description

W. H. NICHOLLS.

MULDING MACHINE.

APPLICATION FILED JuLY'n. 191a.

Patented Sept. 3, 1918..

3 SHEETS-SHEET I.

mwma A HAIEVS w. H. rucuous.

MOLDING MACHINE.

.APPHCATION ms!) mu :1. ms.

Patented Sept 3, 1918.

W. H. NICHOLLS MOLDING MACHINE. APPLICATION FILED JULY 11, I916.

L2"Z*?j% EatentedSept. 3, 1918,

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W 1 77035 5 KS PATENT l WILLIAMH. NICHOLLS, QF BROOKLYN, NEW YORK, ASSIGNOB. TO WM. NIGHOLLS': 00., INC., 015 BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

MOLDING-MACHINE.

Specification of Letters Patent.

1 I Application filed July 11, 1916. Serial No. 108,620.

To all whom it may concern: I

Be it known that 1, WILLIAM H. NIGH- onns, a citizen of the United States, resident of Brooklyn, county of Kings, and 5 State of New York, have invented certain new and useful Improvements in-Molding Machines. of which the following is a full, clear, and exact description.

to a machine for mechanically squeezing or pressing the sand about a pattern or patterns within a flask or flask member thereof.

One of the principal objects of the invention is to provide a simple and efiicient machine wherein the cope member of a flask or' V a flask frame may be supported upon a plate about one or more patterns and the parts forming a mounting therefor given a rapid reciprocatory movement to initially pack or arrange the sand'about the pattern or patterns within the flask frame or member and the sand squeezed and the pattern stripped from the mold entirely automatic.

Another object of the invention is to provide simple and eflicient means whereby a .flask or flask member may have the sand squeezed about a pattern and the pattern stripped from the mold during'a single up and down movement of the flask member and the mounting therefor.

- Other objects of the invention are to provide asimple and eflicient mounting for the.

different parts of the machine; to provide simple and efiicient means whereby a pattern plate may have a plurality of patterns mounted thereon, and the said patterns so' held that a relative movement may be given to the pattern plate with respect to a stripper plate; to provide simple and efficient 40 means whereby annular patterns may be employed; to provide simple means whereby the pressure within the flask or, flask member may be automatically released without and avalve. This invention relates more particularly Patented Sept. 3, 1918.

terns and the patterns and flask given an elevated movement-and the sand squeezed,

about the patterns-and the patterns auto;

matically stripped from the molds and the,

parts restored to a normal osition, all act'u 'ated or controlled by aflui pressure, as air,

and said fluid pressure controlled 3, single.

provide simple and efi ic ient means for. supporting the various parts onywhich the flask and patterns are mounted,.so that tli erewill be no unnecessary vibration to' disturb the.

mold after the sand has been squeezed about lp t l ior patterns A still further object of the invention is i A-still further obj ectof the invention is to to provide a "molding machine which is; adapted to form molds of difierent kindsg and is' adapted for .either single or divided-f "t-;;,5 andother objects in view, the g nvention Wlll be hereinafter more particularly described with reference to the accom-- flasks' With these panying'drawings, which form a part of this pp i a a ill n be p i te ou in the 'clalms at the end of the description; i

In the drawings, Figure 1 is a vertical.sec-. tion, partly in elevation, of onefforin' of machine embodyingthe invention.

Fig. 2 is a section .plan taken on the line I I-II of Fig. 1.

Fig. 3 is a sectional plan taken on the line III- III of Fig.1}.

- Fig. 4c is a sectionalplan taken on the line IV-TV of Fig. 1.

Fig. 5 is a fragmentary sectional. plan taken on the line V -V of Fig. 1.

Fig. 6 is a fragmentary vertical transverse section taken on the. line VIVI of Fig. 1.

Fig. 7 is a fragmentary transverse section on a larger. scale showing how annular patterns may be supported to have a movement relative to a stripperplate or member.. Fig." 8 1s a detail sectional plan of one form of valve which-may be usedto control the fluid pressure supply. r

Fig; 9 is an inverted detail plan of the Fig. 10 is an inverted plan of the valve casing and the connections for controlling the movements of the different parts of the machine. i

, Fig. 11 is a sectional elevation of the con-- trolling valve; and Fig. 12 is an enlarged fragmentarygfisec mounted upon a pattern plate and this pattion showing how the. large it istomis con structed to prevent leakage 'o air or other actuating medium. I

While the invention is showmas a plied more particularly to form the mol s for through the stripper plate are annular pat terns.

These patterns, there being three shown though this number: may vary, are

' tern plate is supported upon a reciprocatory head. This head also supports and guides a frame to which the strlpper plate is held. The head on which is. mounted the flask frame, stripper plate, patterns and frame,

has a part thereof forming a piston which is adapted to work within asecond piston, the latter being movable vertically in a cylinder forming a part of the machine base.

The, two pistons are actuated by compressed air which is controlled by a single valve so -Pthat by placing the valve in one position the smaller piston will be reciprocated very rapidly causing the patterns and flask frameto be also reciprocated rapidly, and by reason of the contact of the head with the upper end of thelarger piston at each re ciprocation a jar or jolt will be imparted to the flask so as to arrange the sand properly about the patterns.

moved upwardly by. the pressure of air so as to carry the smaller piston, the head, atterns' and flask frame against-a pressure oot, head, or member to squeeze the sand about the pattern to form the mold. If the valve is placed in another position the air acting on thelarger'piston is exhausted and this permits all the parts to lower and after moving a short distance the stripper plate and flask frameare held in an elevated position at a point to relieve the pressure by the foot or headon the mold. The' pistons and pattern plate continue to lower, and as the mold, and. support are held against further 'movement the patterns will be stripped from the mold, allowing thelatter .to be, removedgfrom the'machine and ani other" placed in its stead, If the means-for holding the stripper plate in'its elevated position is released the stripper plate forming a mounting for the flask frame is permitted to lower by gravityto its former or normal position, which will cause the patternsto be By placing the valve in another position the larger piston is,

projected above the upper surface of the stripper plate ready for the sand to be placed therein, if not already placed in the flask, and the operation repeated.

The fnachine shown has a base 10 at the upper portionof which is a cylindrical portion 11. Arms or brackets 12 and 13 extend a said post being held in the boss by means of a nut 16 on the lower end of said post. At the upper end of the post 15 are collars 17 and 18 between which is held a head or frame arm 19 which is adapted to be swung to one side of the machine with the post 15 as a pivot. The collar 17-may provide a ball or other bearing for-the arm 19 and on rotatably holding the frame arm 19 on said post 15. Thehead or frame arm 19 has an enlarged portion at 20 at one end, through which the post 15 passes, and at the other end thereof is provided with a boss 21 to which a rod 22 is rigidly held, as by means of the nuts 23 and 24. The lower end of the rod 22 is provided with'a nut 25 and is adapted toenter a vertically arranged open slot 26 in the outer end 27 of the bracket or arm 13, and in such a way that the frame arm 19 may be swung with the rod 22 away fromthe bracket 13 or quickly positioned in the slot 26 as desired to resist vertical upward pressure against the arm 19.

A pressure member, foot or platen 28 is.-

supported upon the frame arm 19. This pressuremember 28 may be' substantially rectangular in form to correspond to the shape of the cope or flask, and has projecting upwardly therefrom a threaded stem or portion 29. This stem 29 engages a threaded aperture ina part of the frame arm 19 so as to adapt the pressure member 28 to be adjustablerelatively to said arm 19. The pressure member or foot 28 is normally stationary, and isadapted to squeeze or press the sand about the pattern when the fiask is forced upwardly, as will be presently described. j

The cylindrical portion 11 offorms a cylinder 30 which has its" upper end open and its lower end closed by a head 31.

In the cylinder 30 is a cylinder piston 32,

which is adapted to have a vertical move- 7 ment. This piston 32 is provided with an inner cylinder 33, the upper end of which 13 open, and in said cylinder 33 is a piston 34 of relatively small diameter as compared with thepiston 32, and which is adapted to have an independent movement with respect to said piston 32. The piston 34 carries a head 35. This head 35 is disk-like in form andis adapted to rest normally upon the.

, 85 the upper end of the post 15 is a nut 20 for a pattern plate 39. The pattern plate 39 is secured by nuts 40 or otherwise to the posts 38 and held to said pattern plate are one or more patterns 41. As shown, there are three patterns, though this number may vary, and the particular form of patterns shown are annular in form, although the shape or form of the pattern may be varied according to the character of the mold to be made. The patterns 41 project through annular slots in a stripper plate 43, on which is 'detachably mounted or held thecopeior' flask frame 44.

' The flask or frame 44 is oi the usual form,

terns be held and supported in a peculiar" and may be provided with apertured lugs which are adapted to fit over pins 45 on the stripper plate 43, or may be otherwise held thereon, as preferred. The stripper plate 43 and the patterns 41 with the pattern plate 39 are adapted to have a relative movementto adapt the patterns to be stripped from the mold, as will be presently described, and by reason of the particular patterns shown being in the form of open ended cylinders, bands or range, it is necessary that said patway, otherwise the annular disk-like part of the stripper plate could'notbe held in posi: tion. To effect this the stripper. plate is provided with substantially til-shaped lugs 46, Fig. 'l, which extend through slots 47 in the pattern plate and the patterns 41 are also slottedas at 48, to correspond to the width of the lugs 46, as shown in Figs. 3 and 7. In

this way the patterns, pattern plate and stripping plate are interlocked, and in such a way that the patterns may move relatively with respectto the stripper plate or the lat-' ter with respect to the patterns and pattern plate.

from the lugs 37 of the head 35. These posts its 51 form guides for the trame 49 and permit relative movement between the frame and I said head. The frame 49 with the head 35, pattern plate 39, patterns 41, stripper plate 43, and flask frame 44 are adapt-ed to have a movement lIl unison, or said i rame 4.9 and.

stripper plate 43 may have a relative down- Ward movement with respect to said head-35 and pattern plate 39 in order that the patterns may be properly positioned with. re-

spect to the stripper plate, as shown in Fig. 1, or the pattern plate with the patternsmay The stripper plate 43 is mounted upon a this purpose the frame 49 on two walls thereof is provided with racks 52, the teeth 53 of which are adapted to be engaged'by the teeth or dogs 54 located at the upper ends of levers 55 when the frame 49 is elevated. These levers 55'are pivoted at 56 to posts or studs 57 extending inwardly from the rear of the brackets 12 and-l3, as shown in Figs. 1 and 6. The lower ends of the levers 55 are connected by a cross bar 58 and to said cross bar is held a pedal 59. The levers 55 below their pivots, 56 extend or incline rearwardly of the machine and transversely of the axis of the pivots 56, as shown in Fig. 6, so that theweight thereof tends normally to throw the dogs 54 into engagement withshown in Fig. 1, there being a semi-spherical body or elementtSO arranged within each pattern if desired, to rest upon the upper surface of the stripper plate 43 to which it maybe secured by screws or otherwise.- The element (50 avoids the; necessity for filling the patterns bothin and about the same entirely with sand and serves to back up the mold to prevent it from breaking while. stripping the patterns. This element 60 also provides a chamber for the escape of gases from the mold to the chamber while pouring the metal, and this is particularly desirable when making castings of copper.

To control the movements of the pistons 32 and 34 and parts mounted uponthe head.

35, various means maybe employed. As

shown, the head 31 is provided with an offset portion 61 forming a passage for the admis} sion of air under pressuretothe cylinder 30 to move the large piston82, and to prevent the piston 32 from being forced entirely out of the cylinder 30 a rod 62 is held to the head 31 and isprovide'd with an enlarged part (3 3 which is adapted to prevent the piston from being forced too far and which in the cylinder 33, which permits air from the pipe 65 within the cylinder 83 below the head 6; of piston 34 to escape into the larger cylindrical piston 32 when the piston 34 has been raised until the lower end of the extension 64 thereof is elevatedabove the said opening 66. A pipe 67 leads from the passage 61 through the large cylinder to the casing .68 of a valve 69 and connected to the .casing 68 is the pipe 65 and also a source of compressed air supply pipe 70. The valve in the casing 69 comprises a diskshaped valve 71 having two openings or recesses 72 and 73 which extend a art of the thickness of said valve, as shown st in Fig.

' 11. The valve is provided with upwardly extending lugs 74 between which is adapted to fit arms or lugs 75 projecting-outward from a'stem 76. The stem 76 is rotatably held in the valve casing, and at the outer end is provided with an operating handle 77, there being a spring 78 within the valve casing tending normally to keep the valve to.

. its seat. 7 The valve casing is provided with four openings 7 9, 80, 81 and 82. The open -ing 79 connects with the pipe 65*"leading to thelpipe (55 and the small cylinder, the opening 80 to the air supply, the opening 81 to the pipe 67 leading to the large cylinder 30,

and the opening 82 to the exhaust, whichmay be controlled by. a pet cock 83 to regulate the amount of the exhaust or in any other desired way, and thereby regulate'the speed of the draw.

The pistons may either or both be act u ated by any suitable pressure medium whether air, water, steam, or the like, and said pistons are adapted to have suitable packing to retain the pressure properly and prevent leakage. The smaller piston-may av'e suitable packing rings 84: about the same, and the larger piston may have one .or more packing rings 85. The packing ring 85 isof a special construction and is adapted to be forced or'spread outwardly by the pressure of the medium Within the cylinder 30. This packing85 may be of any suitable material, and .may have its ends overlapping and cut the same as an ordinary piston'ring- The packing 85 fits neatly within an annulhr groove in the piston 32,

' and at the inner portion thereof is provided with an annular substantially V-shaped I groove 86. This roove is opposed to an annular recess 8 7 1n the piston 32 and this annular groove 87 connects by a channel 88 .with the pressure end of the cylinder 30'so that airor' otherlrnedium for moving the,

piston may pass through the channel 88 into the annular groove 87andaet upon the ring 8;"; to; force the same. outward to provide an .eflective hearing ;by the ring against the cyl I :jp'der and retain the pressure within the eyl 'indor .d uring. the squeezing operation. The packing ring 85 maybeo t such material and exhaust openin or channel 66.

the groove 86 may be of such shape that when the pressure within the cylinder 30 is exerted on the packing rim. 85 it will spread the rear part of the packing ring suihcient to form a tio'ht joint between the packing rinq and the piston and prevent all leakage past the ring.

.The operation of the invention will be readily understood from the foregoing description when taken in connection with the accompanying drawings. The flask frame being placed upon-the stripping'plate 43 in the position shown in Fig. l with the other parts in the position shown in this figure and the pipe;70 connected to a source of air supply under pressure and the valve 71 by means of the handle 77 operated so as to connect through the passage 72 thepipe '70 and pipe 65 leading to the small cylinder 33, it will be evident that the pressure under the head 64: of piston 34 will cause the piston 34 to be raised until the lower hnd of the extension 64 of said piston uncovers the .tinued at will until the sand is initially packed properly about and within the patterns'stl. By moving the handle 77 so as to connect the air supply opening 86 with the opening 81 air under: pressure will be. permitted to pass through the pipe 67 and channel 61 into the large cylinder .30 below the head of the'large iston 32. This res'sure will elevate the argeypiston, which will. carry withit the smaller piston 34 and all the parts mounted upon the head 35, including the flask, so'that the sand may be squeezed about the patterns by means of the normally stationary head or foot 28, there being previously placed within the flask a loose packing Board or member serving as the engaging means for the foot or member 28. Durin the upward movement of the frame 49 the teeth 53on racks 52 will ride past the "dogs 54 on levels 55. The threads of the stem 29 of'the foot 28 are ofsubsthn 'tially the" same pitch'as the teeth 53 of the rack'sfiQ and, therefore, by giving the foot 28- a half turn' after the sand has been -jueezed in the 'mold it will be observed 'that the frame 459, head 35, pattern plate 39,,-

stripperplate 43 and the patterns will all 'mo.\'e 'up\\-'ardly in unison slightly while there-Will be a partial disengagement or relative upward movement between the. dogs -1 and the particular teeth with which -rying with said'dogs were engagedat the completion of z the squeezing operation, this relativemovement being equal .to about one half the If the'handle 'Z is .now moved so-that the recess-. of the valve con-- length of a tooth.

nects the pipe 67 with theexhaust opening 82, the piston 32 will mov ejdow'nwardly car-j it the. small piston 34, head 35,,

flask frame, stripper plate and pattern plate with the patterns thereon until the partiallydisengaged teeth 53 are again engaged by the dogs 5i.v This slight downward movement of-the parts in unison is suflicientto relieve the mold of the pressure of foot 28 before the stripping of J-the patterns-begins.

' When the teeth 53 and dogs. 54 again engage .20 to descendjthus causing a relative movement between .the pattern plate and the stripper plate which results in withdrawing the pat the downward movement of the frame 49,

stripper plate, and flask is arrested but the pistons, head 35, and pattern plate continue 49 with the stripper plate 43 to lower, causmg the patterns 41 to again project above the stripper plate, as shown in Fig;'1, in po-. sition for the sand to be placed within the flask frame and the same operation repeated.

From the foregoing it will be evident that a simple and efficient machine is provided whereby a rapid reciproca-tory jolting or jarring action may be given to a cope or flask frame and the sand within the flask frame squeezed and the patterns stripped from the mold all underthe control of a single valve; thatrsimple means-is provided whereby the squeezing and withdrawing of the patterns is effected during a single up and down movement of the parts; that simple means is provided whereby molds of annular or cylindrical objects are formed; that simple means is provided whereby the mold is prevented from collapsing or being injuriously affected by reason of the jarring of the parts, and that said machine is simple in construction and may be readily madef and assembled. Having thus described my claim as new and desire to secure by Letters 1 Patent 1. In a molding machine, the combination of a support, two pistons held-insaid support of relatively adaptedto move different diameters and together or independently, a head carried bv one of said pistons, a frame supported by said head adapted to tojsupport a flask plate also supported by. saidhead, patterns pistons may adapted to moire togetherorindependently,

. son or one independently I cause a relative movement between the stripe. per plate and the pattern plate-and to both the stripper plate and pattern plate," i?

of pattern supporting means, ping means adaptedto support a flask frame the stripping means in an elevated position ihvention, I

, thereon, a pattern plate also have a relative movement thereon, a stripper plate supported by .said frame and adapted frame thereon, a pattern mounted on said plate,'. apressure member, releasablemeans' adapted to. hold the frame and str pper: plate in tin-elevated position and toibe released there fromto adapt said stripper [plate andffrarneto lower, independently 6f the movement of the pattern plate and patterns, and means whereby the dependently of the other toacaus'e a relative movement between Zthe' stripper pl-ate and. the'pattern plate andto impart a rapid reper plate and pattern plate.

2. In a molding machine, of a-support, two pistons held. i'n'said support of relatively diifei'ent ldiametersan thecqrnbinatidn st). 'ciprocatory jarring action tobotlrthe strip a frame operative'ly connected to'one'of the 5 pistons to 'have respect thereto, a stripper plate supported by said frameand adaptedto support a flask frame thereon,

per plate in an elevated position and to be released I plate and frame to the movement a patternplate also supported by said -head, ipatterns mounted .l on said plate, apressure member, releasable; 'means adapted to hold the frame and strip- 1 herefromto adapt said stripper lower independently of 71f of the pattern plate andrpat-"' a relative movement with not terns, and compressed air controlled means whereby the pistons may be moved-in unipart a rapid reeiprocatory arring action of the other to 3. In a molding machine, the combination 1 thereon, releasable means adapted to hold and to be released therefrom to adapt said stripping-means to lower independently of the movement oi the patternsupporting means, and means whereby the pattern suppattern strip v porting means and the stripping means may be moved in unison or one independently of the other. y i i. Inia molding machine, the combination of a support,two pistons held in said sup- 4 together or inde-v port and adapted to move pendently, a head carried by one of said pistons, a stripper plate supported by said head and adapted to support a flask frame said head, a pressure member,

an elevated position and to be released therefrom to adapt the said. stripper plate tosupported, by v releasable .125 means adapted tohold the stripperplate-in lower independently of the: movement of the pattern plate,.and means wherebvthe 13G 25 .1--- part 'a'rapid reeiprocatory arring action to pistons may be moved in unison or one independently of the other to cause a relative movement between the stripper plate and the pattern plate.

5. In a molding machine, the combination.

of a support, two pistons held in said support of relatively different diameters and adapted to move together or,i ndependently,-

a head carried by one of said pistons, a frame supported by said head adapted to have a relative movement thereon, a stripper 'plate supported by said frame and adapted to support a flask frame thereon, a pattern plate also supported by said-head, an adjustable normally stationary pressure member, releasable means adapted to hold the frame and stripper plate in an elevated position and to be released therefrom to ada it said stripper plate and frame to lower independently of the movement of the pattern plate, and single valve controlled fluid pressure means whereby the pistons may be moved in unison or one independently of the other to cause a relative movement between the strip perrplate and the pattern plate and to imsaid stripper plate to lower independently of the movement of the pattern plate, and means whereby the pistons may be moved in unison or one independently of the other to cause a relative movement between the stripper plate andthe pattern plate.

7. In a molding machine, the combination of a fia'sk, a stripper plate, a pattern plate having a pattepn thereon projecting through,

the stripper 'plate, and means for rapidly reciprocating said stripper plate and pattern plate in unison to impart'a jarring movement to the molding devices, and means for reciprocating the pattern plate independ ently of the-Stripper late to withdraw the patternfrom themoldn, 5 i 8; Ina molding machine, theoombination of a stripper platei a flask frame'supporte'd ontsaid stripper plate a pattern plate havinga pattern thereon nonnally projectingv In a molding machine, the combination of a pressure member, means for Sup porting said pressure member, a stripper through the stripper plate, a pressure mem-l 4 her, means whereby the stripper plate and-'- Mpattern plate may be given'a arring movement'in unison, means forrmoving said plates in unison into operative relation with the,

pressure me1nber,- andmeans for causing a relative movement between the stripperplate' nd pattern plate to 'withdraw the pattern f rom' the mold.

s 9. In a molding machine, the combination of a flask frame sup orting means, a pattern supporting means a apted to support a pattern within the flask frame, a pressure member, means for rapidly reciprocating the flask frame supporting means and pattern supporting means in unison to impart a jarring movement to means for moving the flask frame supporting means and the pattern supporting means toward the pressure member to squeeze sand about the pattern and means for causing a relativev movement between the flask frame supporting means and the pattern supportmg means when said means are moved away mitted between the stripper plate and the patterns to withdraw the patterns from the mold.

11. In a moldin machine, the eombination of a stripper p ate adapted to support a flask frame; apattern plate having a pattern thereon, a normally fixed ressure member, meansfor holding the stripper plate in an elevated position, and means whereby the stripper plate and pattern may be given a movement to squeeze sand about the pattern and a relative movement permitted between the stripper plate and the pattern plate to withdraw the pattern from the mold.

12. In a molding machine, the combination of a stripper plate adapted .to support a flask frame, a pattern plate having a plurality of annular patterns projecting through said stripper plate, a pressure member, and means whereby the stripper plate and patterns may be given a rapid reciprocatory movement and an elevating movement to squeeze sand about the patterns and a relative movement permitted between the stripper plate and the patterns to withdraw the patterns from the mold.

plate, a pattern plate having an annular pattern thereon projecting through said stripper plate, a plurality of substantially the molding devices,

U-shaped lugs connecting the part of the stripper pl .within the patternto a part without/said pattern, said. pattern plate and pattern being sloi ted to permit the stripper plate to move relatively to the pattern plate -means for elevating the stripper plate and pattern plate in unisonjtowardthe pressure plate, a plurality of lugs connecting the part of the stripper plate within the pattern to a i part without said relatively to the pattern elevating the -plate-in unison structed to permit thest-ripperplate to move plate, means for stripper plate and pattern toward the pressure member, and means whereby a relative and the pattern plate.

- 15. In amolding machine, the combination of a flask 'ft'ramesupporting means, pat

tern supporting means, pressure means, end means for. imparting a mechamcaljarr n'g action to. the flask framesupportmg means and a distinct unitary movement of both'the flask frame supportin'g means means,

.ment may.

and the patternfsu'pporting means toward'the pressure he given'tothe pattern supporting means and the flask frame supporting means. 16. In a molding machine, the combination of afiask frame supporting means, pattern supporting means, pressure means, and

- fluid pressure controlled inean'sl or imparting a mechanical jarring action to the flask I frame supporting meansand: a distinct uni the pattern from'the mold.

tary movement of both'the flask frame sup porting-means andthe pattern supporting means toward the pressure means, and means whereby a relative movement maybe given to the. pattern supporting means and the flask frame supporting means to withdraw 17: In a molding machine,

rustable in said frame arm may said frame, a pattern plate, a stripper plate I adapted to support aflask frame'and movable with the pattern plate toward the pressure foot, means for holding the stripper plate in an elevated position, and means whereby the pressure exerted by the pressure foot may'be automatically released.

18. In a molding marhine, the combination of a frame, a rotatable frame arm, a pressure foot having a threaded stem adjustable in said arm, a pattern plate. a strip per plate adapted to supporta flask frame and movable with the pattern plate toward the pressure 'foot. and means whereby the pressure exerted by the pressure foot may be automatically released;

- stripper means for, supsaid stripper pattern andthe parts con'- .the stripperplate, held to"said head, movement may be'efi'ected between the stripper plate and meansgwhereby airelative move 19. In a molding machine, the combinatlon of a frame,,a rotatable frame arm, a pressure foot ad ustable in and arm, means whereby the frame arm may be held against rotation on said frame, a pattern plate, a,

plate adapted to support a frame and movable with the pattern plate toward the pressure foot, and rack and dog means for releasably holding the stripper plate in an elevated position.

20. In a molding machine,--the=combinaframe to move therewith, a head for holding a flask frame on a patternplate rigidly apatternsupported by saidplate, a pressure member located 'above the stripper plate and pattern, a piston formed integral with said head, a second larger piston having a cylinder for said, piston of he head, and means whereby the smaller piston may move to cause a rapid reciprocatory movement to be imparted to the flask frame, strippercplate and pattern plate and then both pistons in unison to squeeze the sand about the pattern, and means whereby a relative movement may be given to the stripper plate and the pattern frame, means plate to-withdraw the pattern "from themold.

21. In a molding machine, the combine tion of a stripper plate adapted to support a flask frame, a head having posts serving as guides for said stripper plate, a pattern plate rigidly held to said head, a plurality of annularpatterns supported by said plate, a pressure member located above the stripper plate and patterns, a piston movable with said head, a second larger piston having a cylinder for the first mentioned piston, and means whereby the smaller piston may move to cause a rapid reciprocatory movement'to be imparted to the flask frame, the "combine: 'tion of a frame, a rotatable frame arm; a

ressure foot having a threaded -*stem ad;" arm. means whereby the, be held against rotation: on up I pettems from the mold.

stripper-plate and pattern plate. and the'two. pistons moved in unison to squeeze the sand about. the patterns, relativemoyement maybe given to the stripsit-plate and the pattern plate to strip the 22. En a-xmolding machine. the combine flask tionof a frame, a' stripper plate mounted "upon said having posts serving as guides'for' said and means whereby a tion of a' afi alnelhavin a c linder a piston- 1,

movable insaid cylinder, a smaller cylinder? formed integral Withsaid piston, a piston V 12a movable w-itliin said smaller cylinder, said cylinder having an exhaust opening and a source of compressed air supply 'theretofa source of air supply for the larger piston,

mold forming means operatively connect-ed to the pistons, and means whereby the pis tons may be made to move in unison or inde pendently to adapt the mold supporting means to be given a rapid reciprooatoryn jarring action and r a movement whereby sand may be squeezed to form a mold,

123. In amoldingv machine, the combinatibn of a frame having a cylinder, a piston movable in said cylinder, a bolt for limiting the extent of movement of said piston, a

smaller cylinder formed integral with said piston, a piston movable within said smaller cylinder, saidcylinder having an enhaust opening and a source of compressed air supplythereto, a source of airsupply for the larger piston, mold forming means operatively connected to the pistons, and. means whereby the pistons may be made to move 1n unison or independently to adapt the mold supporting means to be given a rapid re ciproeatory jarring action and a movement whereby sand may be squeezed to form a mold.

24, In a molding machine, the combination of a frame having a cylinder, a piston movable in said cylinder, a smaller cylinder located within said piston, a piston moyable within said smaller cylinder, said cylinder frame, said cylinder piston having a small cylinder substantially central thereof, a piston movable in said small cylinder, ahead Lion of a frame having a base, a cylinder in the base, a piston movable within said cylinder, a pressure member supported by said frame, said piston having a smaller cylinder within the same, a piston. movable in said smaller cylinder,a head carried by the smaller piston, and a single valve controlled compressed air supply for supplying compressed air to move the pistons in'unison or independently, a stripper plate, a relatively movable pattern plate mounted to have a relative movement or to move together with the movement of the pistons, and releasable means for holding the stripper plate in an elevated position.

- 28. In a molding machine, the eombination of a support, a pressure member, a stripper plate, a relatively movable pattern plate,

means for moving the pattern plate and carried by said small piston, means for preventing too great movement of the large piston, means'ineluding a single valve controlled compressed air supply for supplying compressed air to move the pistons in unison or independently, a stripper plate, a

relatively movable pattern plate mounted to have a relative movement or to move together with the movement of the pistons,

- and releasable means for holding the stripper plate in an elevated position.

26. In molding machine, the combina tion of a frame having'a base provided with a cylinder. a cylinder piston movable within said cylinder, a pressure member supported by said frame, said cylipder piston having a small cylinder within the same, a piston I movable in said small cylinder, a head carried by said small piston, means to move the pistons in unison or independently, a stripper plate, a relatively movable pattern plate mounted to have a relative movement or to move together with the'movement of the pistons, and releasable means for holding the stripper plate in an elevated position.

27. In a molding machine, the combinastripper plate toward the pressure member, racks mounted to move with the stripper plate, levers having teeth adapted to ,engage the teeth of the racks, and a pedal for releasing the levers from the racks to adapt relative movement to be given to the stripper plate with respect to the pattern plate.

29. In a molding machine, the combination of a support, a pressure member, a stripper plate, a relatively movable pattern plate, means for moving the pattern plate and stri per plate toward the pressure member, and releasable dog and rack means for holding the stripper plate elevated.

30. In a molding machine, the combination of a support, a pressure member, a stripper plate, a relatively movable pattern plate, means for moving the pattern plate and stripper plate toward the pressure memher, a rack mounted. to move with the strip per plate, and a lever having a dog adapted toengage the teeth of the rack whereby relative movement may be given to the stripper plate with respect to the pattern plate.

31. In a molding machine, the combina tion of a support, a pressure member, a stripper plate, a relatively movable pattern plate, means for moving the pattern plate and stripper plate toward the pressure member, racks mounted to move with the stripper plate, and releasable levers having dogs adapted to engage the teeth of the racks.

82.-In a molding machine, the combination of a frame, a frame arm mounted thereon, a pressure member'having a threaded stem adjustably held in said frame arm; a stripper plate, a rack mounted tO-IIIOVG with said stripper plate and having the teeth I thereof of the same pitch as the threads of the stem of the pressure, member, means adapted to engage the rack to hold the strip per plate-in an elevated position, a patternplate, and'means for moving the pattern plate. and stripper plate toward the pressure member, the pitch of thethreads of the stem of-the pressure member and the teeth of the Lemma ately the means engaging said rack is released.

33. In a molding machine, the combina tion of a frame, a frame arm mounted there on, a pressure member having a threaded stem adjustably held in said frame arm, a stripper plate, a rack mounted to move With said stripper plate, a dog adapted to engage the rack to hold the stripper plate in an elevated positioma pattern plate, and means for moving the pattern plate and stripper plate toward the pressuremember, the pitch of the threads of the stem of the pressure member and the teeth of the-rack being the same to adapt the pressure by the pressure foot to be released immediately the dog is released from said rack.

3st. In a, molding machine, the combination of a frame, a frame arm mounted thereon, a pressure member having athreaded stem adjustably held in said frame arm. a

stripper plate, a rack mounted to move with said stripper plate. a lever having a dog adapted to engage the rack to hold the stripper plate in an elevated position, apattern plate, and means [for moving the pattern plate and stripper plate toward the pressure member, the pitch of the threads of the stem of the pressure i'nember and the pitch of the teeth of the rack being the same to adapt the pressure by the pressure foot to be released innnediately the dog is released from said rack. 55. In a i'nolding nmchine, the combination of a pressure member, pattern supporting means, means for supporting a flask frame about the pattern, a valve casing,'a valve movable in said casing and having a handle operatively connected to rotate the same, relatively movable pistons, and con nectious between the valve and the pistons to adapt one piston to be moved independout of the other or both pistons to be moved I together.

' 30. In a molding machine, the-combination of molding means,'and a single valve and connections between said valve and the molding means whereby the molding means may be given a rapid reciprocatory movement and the mold formed during a single up and down movement of said molding means.

37. In a molding machine, the combination of a pressure member, pattern supporting means, meansfor supporting a flask frame about the pattern, a valve casing. a valve movable in said casing and having a handle operativ ely connected to rotate the same, relatively movable pistons and connections between the valve' and the pistons and controlled by said valve to adapt one pis} ton to be'moved'independent of the other,

'38. In a molding machine, the combinationof molding means, a valve casing, a rotary valve movable in said casing, relatively movable pistons connected to the molding means, and connections between the valve and the pistons and controlled by the valve to adapt one piston to be moved independent of the other or both pistons moved together.

39. In a machine of the character described, the combination of a support adapted to hold a flask frame thereon, a relatively movable patterii adapted to project above. the support and Within the frame, means for causing a relative movement between the pattern and the support, and a substan-- tially semi-spherical element held to the support within'the pattern adapted to form a chamber within the mold to avoid the necessity for filling the pattern entirely with sand and to back up the mold and serve as a chamber for the escape of gas while casting the metal.

l0. In a. machine of the character described. the combination of a support adapted to hold a flask frame thereon, a rela-- tively movable pattern adapted to project above the support and within the frame means for causing a' relative movement} 9; tween the pattern and the support, and. element held to the support within the pattern adapted to form a chamber within the mold.

41. In a. molding machine, the combination of mold forming elements, pistons of relatively,- diflerent. diameters operatively connected to said elements, one piston Working within the other, packing means between the two pistons, a cylinder for the larger piston, a source of pressure medium supply for the cylinder, a packingring held to the larger piston to move outwardly thereonand having a grooved inner portion to adapt the packing to be spread, and means forming a connection with the pressureend of the cylinder to force the packing outwardly and to spread the inner portion thereof;

42. In a molding machine, thecombination of mold forming elements,."a piston '115 having an annular groove operatively' connected to said elements, a cyhnderfor the piston, a source of pressure medium supply to the cylinder, a packing ring held in the annular groove of-the iston to'move out wardly therein and having a grooved inner portion to adapt the packing to be spread, and means forming aconnect ion with the pressure end of the cylinders 43. In a molding machine, the combination of a "pressure member, a pattern supporting means, means for supporting a flask frame about the pattern, fiuid= pressure opering means ,tovvard andfronr said iiiressure member, itingle valve, and connections be- I tween said valve and fluid pressure operated devices whereby the flask frame and pattern may 'be given a jarring movement and a movement in unison toward said pressure member and a movement away from said pressure member.

44. In a molding machine, the combinavpressure member, and means for causing, a

relative movement between the flask frame supporting mean and the pattern supporting means to withdraw the pattern from the flask frame during the movement of the flask fran'ie and pattern supporting means away from the pressure member.

45. In a molding machine,-the combination of a pressure member, pattern supporting means, means for supporting a flask frame about the pattern, a piston connected to said flask frame supporting'iheans, a piston connectedto the pattern supporting means, a valve, and connections between the valve and said pistons and controlled by the valve to adapt one of the pistons to rapidly reciprocate the flask frame and pattern supporting means in unison and to reciprocate the other of saidpistons to move the flask frame and pattern supportingmeaus. toward and from the pressure member.

46. In a molding machine, the combination of a pressure member, a pattern sup porting means, aflask frame, means for supporting the flask frame about a pattern. relatively movable pistons connected to the pattern supporting means and flask frame supporting means, a valve casing, a connection between said casing and a source of fluid pressure, an exhaust passage connecting said casing with the atmosphere. independent connections adapted to deliver a fluid pressure medium from. said casing beneath said pistons, and a rotary valve in said casing controlling said connections to cause a rapid reciprocation of one of said pistons to imparta jarring movement to the flask and pattern supporting means in one position of the valve, tomove said pistons H1 unison toward the pressure member in another position thereof, and to open said exhaust passage to permit the pistons to a means and pattern supporting means toward means for moving the flask supporting stripping means, a flask,

' relieved, and means whereby the pattern move away from the pressure member in another position thereof.

7. In a molding machine. the combination of a flask flask supporting means, pattern supporting means,. pressure means, means for moving the flask supporting and from the pressure means, means for z utimiatically arresting the movement of the flask supporting means after the flask supporting means and pattern supporting means have moved away from the pressure means sufliciently to relieve the mold of pressure, and means-\\'hercby the flask supporting mean may he released after the pattern supporting means has moved relatively thereto sufficiently to strip the pattern from the mold.

In a molding machine, the combination of a flask, flask supporting means, pattern supporting means, pressure means,

means and pattern supporting means toward and from the pressure means, means for automatically arresting the movement of the flask supporting means after the flask supporting means and pattern supporting means have moved away from the pressure means sufliciently to relieve the mold, of pressure, and manually operable means for releasing the flask supporting means after the pattern supporting means has moved relatively thereto to strip the pattern from the mold.

4-9. In a molding machine, thecombination of pattern supporting means, pattern pressure means, means for moving the pattern supporting means and stripping means in unison with the flask toward the pressure means, means whereby the pressure on the mold may be 10! supporting means may be returned to normal position in advance of the pattern stripping means after the pressureon the mold is relieved.

50. In a molding machine, the combination of a flask, flask supporting means, pattern supporting means, pattern stripping means, pressure means, means for moving the pattern supporting means toward and from the pressure means, means whereby the flask supporting means and pattern stripping means may be moved toward the pressure means in unison with the pattern supporting means, and means whereby the pattern supporting mean may be returned to normal position in advance of the flask supporting means and pattern stripping v means to strip the pattern from the mold.

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