US2598621A - Machine for blowing sand into molds - Google Patents

Description

May 27, 1952 R. w. TACCONE MACHINE FOR BLOWING SAND INTO MOLDS Filed April 2, 1948 5 Sheets-Sheet 1 INVENTOR y 27, 1952 R w. TACCONE 2,598,621

MACHINE FOR BLOWING SAND INTO MOLDS Filed April 2, 1948 5 sheets-Sheet 2 I 62 0 I /4 I I I /43 I //4 i, J) #5 INVENTO P/Ue//QJ Em 1e ATTORNEY May 27, 1952 R. w. TACCONE MACHINE FOR BLOWING SAND INTO MOLDS 5 Sheets-Sheeu 5' Filed April 2, 1948 0 iNVENTOR Pmrsel/ Qlfic caue ATTORNEY y 27, 1952 R. w. TACCONE 2,598,621

MACHINE FOR BLOWING SAND INTO MOLDS ATTORN'EY May 27, 1952 R. w. TACCONE MACHINE FOR BLOW ING SAND INTO MOLDS 5 Sheets-Sheet 5 Filed April 2, 1948 ATTORNEY Patented May 27, 1952 MACHINE FOR BLOWING SAND INTO MOLDS Russell W. Taccone, North East, Pa., assignor to Taccone Pneumatic Foundry Equipment Corporation, North East, Pa., a corporation of Pennsylvania Application April 2, 1948, Serial No. 18,589

8 Claims. 1

This invention relates generally to machines for making molded sand products such as cores and more particularly to machines for blowing sand into molds to make cores and like molded products.

Prior devices force a comparatively small jet of air through the center of a sand holder leaving a large portion of the sand in the sand holder clinging to the walls thereof because of the viscous nature of the sand and used in making cores and other molded products. The bottom of the sand holders generally have a sieve like structure and great difficulty has been experienced in blowing th viscous sand product used in making cores from the sand holder. Inverted V-shaped sand holders have been tried in prior devices but the sand still clings to the side of the holder inasmuch as the jet of air moves centrally thereof. None of these prior machines have provided automatically operated shut-01f means for the air. No means has heretofore been provided for fully and sealingly engaging the sand holder automatically with the result that sand was blown in the face of the operator and the machine and the sand holder is formed out of alignment. Furthermore, no means has been provided for evacuating the spac in the top of the sand holder during a predetermined portion of the operation. Furthermore, separate air source means has not been provided for providing power and for compression in a core or mold blowing machine. Another of the defects of prior machines is that the sand is forced ahead of the comparatively low pressure jet of air and is not dispersed throughout the mold.

It is, accordingly, an object of my invention to overcome the above and other defects in machines for blowing sand into a mold and it is more particularly an object of my invention to provide a machine for blowing sand into a mold which is simple in construction, automatic in operation, economical in cost, economical in manufacture, efficient in operation, and easy to operate.

Another object of my invention is to provide a machine'for blowing sand into a mold which disperses the'air throughout the entire area of the sand holder so that the sand and the air move together into the mold.

Another object of my invention is to provide automatic means for shutting off the air supply in a machine for blowing sand into a mold.

Another object of my invention is to provide a novel machine for blowing sand into a mold which compresses the air or fluid therein on each operation thereby requiring a minimum of air pressure in the supply line for efficient operation.

Another object of my invention is to provide a machine for blowing sand into a mold wherein air and sand in a sand holder are inter-mixed before the sand and air move into a mold.

Another object of my ,invention is to provide novel means for removing trapped air from a sand holder to prevent sand from being blown into the face of the operator along with means for automatically shutting off said means.

Another object of my invention is to provide novel means for controlling air passing to and from a machine for blowing sand into a mold.

Another object of my invention is to provide a machine for blowing sand into a mold having novel means for controlling the opening of a valve for releasing air into a sand holder.

Another object of my invention is to provide a novel spring-suspended swingable sand holder for a machine for blowing sand into a mold.

Another object of my invention is to provide a novel arrangement of check valves in fluid lines for powering and providing air to be compressed in a machine for blowing sand into a mold.

Another object of my invention is to provide a novel arrangement of check valves in theair lines of a machine for blowing sand into a mold to prevent escape of air from the machine at predetermined times.

Another object of my invention is to provide a machine for blowing sand into a mold wherein separate fluid means are provided for powering the device and for providing air for compression therein.

Another object of my invention is to provide novel seating and sealing means in a machine for blowing sand into a mold.

Another object of my invention is to provide yieldable seating means between the seating member of a machine for blowing sand into a mold, a sand holder and a mold.

Another object of my invention is to provide a novel arrangement of assembled parts for a machine for blowing sand into a mold.

Another object of my invention is to provide novel means in a machine for blowing sand into a mold for compressing the air therein.

Another object of my invention is to provide novel means for limiting the amount of air compression and the amount of the opening of the release valve in a machine for blowing sand into a mold.

Other objects of my invention will become evident from the following detailed description,

taken in conjunction with the accompanying drawings, in which Fig. 1 is a side elevational view of my novel machine for blowing sand into a mold, in aninmold in front elevation with'parts of the sand better. ilj holder and its support in section for lustration;

Fig. is a diagrammatic plan view of my novel machine for blowing sand into a mold with the sand holder swung into a position beneath the sand hopper; and

Fig. dis a plan view similar to Fig. 5 with parts? thereof broken 'awayshowing the sand holder in a p'ositionto be engaged by the seating member of' my" novel machine for blowing sand into a" mold and for engaging a mold on the under side thereof. 1

Referringnow to the drawings, Figs. 1, 2 and 3 show a base l with a vertically extending, hollow cylihdricalmemberxZ extending upwardly on the backside" thereof-forming a reservoir for air or other fluidg-Atbracket l is clamped around reseryoir-2 by bolt-and'nut assemblies 5 and the semi-circular'shapedportion. 6 thereof is engage'd by complementary, semi-cylindrical shaped clamp-member 1 through bolt and nut assemblies-B to engage and support a cylindrically shaped member-12. The-hollow cylindrical member 2 has an inlet: 1?, and outlets l4 and [5. The cylindrical'member 12 has an inner stepped portio'rr'lfi :forming ai shoulder I8 and an outer shoulder l-9rfor engaging the bottom of the semicircular-shaped portion 6 of bracket 4 and semicircularrshapedimember 1.1 A piston 20 having a'central aperture ll a peripheral washer 22 in the' aperture 2l.,;.anouter peripheral washer 23, and a depending skirted portion 24 with ex- 7 ternal threads 25; formed on the lower end thereof;is-:disposed for reciprocation in the cylindrical member' [2 and islimited in its, downward movement by the shoulder 18. Apylindrical plate'or wall 26 having peripheral grooved portions 21 and:28 seatsv on the upper end of the cylindrical member =12 :and has a central aperture 29 with a peripheral was-herjfl, alignment withthe aperture 2| in the piston 20. L- shaped apertimes 31 and 32 provide a passageway for fluid to engage the piston 241 and to an upper chamber 33 formed by annular member -34 which seats in the. grooved -portion 28 of the wall member 26. membe base ere d hgfl ns portion 36 forming an L-sshaped peripheral groove 31. for seating' on' 'the'upper end of the annular member 34, and it has a centrally disposed aperture 38 'withiaper'ipheral washer 39 in alignment with the apertures' '29: 'a'hdiZl in the wall member 26 and the'piston 'flL'frespectively. A piston 40 with a peripherall'wa sher H is 'reciprocable in the annularm er tit-and it has'a rod 43 and a rod 42 -extend1ngupwardly and downwardly therefrom; through the { apertures 38, 29 and 2 l, in" the 'cap memberii fi; wall member 26 and piston 20, respectively. "The upper end of rod 43 pistons connected thereto. The stop member 45 seats on an upwardly extending boss 41 on the cap member 35. The rod 42 has a threaded portion 41 on the lower end thereof for threadably engaging a threaded aperture 48 in compression piston 49 which is reciprocable in the skirted portion 24 of the piston 20. The piston 49 has a conventional peripheral Washer 50.

Also reciprocable inthe skirted portion 24 of the piston 20 is a piston 52 having a longitudinally extending aperture 53, a recessed portion 55,

'- with an aperture 90 injthe mein be;r 66,-.

is threaded a't4' i for threadably engaging a stop member 45 and a lock nut 46 to limit the longi 20 and 48.

formed on the lower end thereof a valve head 59,

the piston 52' being held against upward movement by a transverse pin 5| extending through the upper end of the rod 51. The valve head 59 normally engages a tapered seat 60 in the lower portion 6| of a seating member 62 which has a threaded portion 63. for .threadable engagement with the lower threaded end 25 of the piston 20v whereby theseating member 62.,re: ciprocates with the piston 20. The seating mam-j ber 62 has an open cylindrical portion formed by depending flange fi ion the lower end thereiof which has'an internal peripheral groove. 65' for receiving a yieldable sealing member 6%. made .of rubber or any other suitable .yieldable material. The seating member 62 also has a laterally BX: tending housing 6.1. with a transverse seat 68in a wall 69 and an apertured webbed portion,l0,;for' journallingthe stem ll ofa valvejhead, 12 adapted to sealingly'engage the seat 6.9...in the wall 68. The housing 6'! hasuan' outwardly exa tending portion 73 attached to the flanged end 74 of a fluid line it which leads, to. .andiis. connected to the opening Itinthe reservoir 2.. Seating member 62. also has anangularly ex-,

" tending aperture and anwangularly, pirbjractlav ing. portion M. for receiving the "dependi ng flanged portion 82, of a split valve members; havin tra sv s pa sa es. 84. and a e dable d aphra m 85. disposed .centrallyth r dapte to e on an upwardly. extendin seat flfiiorm d.

r l y f h valvemember 83 whenthe .fiuid 'th upp r s de. of the. .valve 83. ha asrfia er. pressure than the fluid in the passage 3% in the seating member .6 Theaperture. 80.: e1-i md pipes 81., 88iand 89,.iare. connected to. apertures.

3| and 9! in the wall member zfi and the gapv member 35 respectivelytq provid asnurce. f. air or other suitable. fluid rorgactuating the pistons control valve 92, manually operated by. a handle 93. The n rol" ya ye'fiz 111s. -.conne.c ;e with the. erture 32 limit-1.1.6. wallmemherifi. hyp ng th r by providing. -a. -sourehot .fluid i 1.11

- th piston 40...: Theya ve. 11. remnmtsid.

to the. opening |5 in themes .by pipe 95 and check -valve housi-ng. Thsshqllfiin as has a conven onal." h c d alyeAL her in dapt d t s li ly nsage'th ls R fe r ng'nowtoF g-A bracke by any suitable m ans taste-m netary qcy, member J2 and it has aperture 1 extending portion llll for journ 1n g a sleeve. I02 having cylindrical; recesses -l fli and lll' i. Shaft 5 is. d sposediinjt e. recessx "A. tth sleeve I02. and it h'asa reduced portion lllflfi ex; tending. upwardly? through the apertured portion I01 in the' slee've 10.2w. A?spring l llfllris disposed in the recess: I03 surrounding the reduced pdr Pipe 89 leads into a conventional 5 tion I03 of the shaft I04 and it is held in position bya washer I09 and a transversepin I I secured to the upper end of the reduced end I06 of the shaft I94. The lower end III of the shaft I04 is reduced in size and has a threaded portion H2, for supporting a bracket H3 which has an apertured bossed portion II4 connected to the lower end of the shaft I04 by a threaded member H5 threadably engaging the threaded portion H2 of the reduced end III. The bracket II3 also has an apertured portion H6 for receivving a cylindrical sand holder H1. The bracket H3 also has an outwardly extending handle H8 for manual rotation thereof. A torsion spring H9 which surrounds the sleeve I02, has the lower end I thereof connected to a bracket I2I comprising part of a closing gate member I43 and the upper end I22 thereof connected'to an adjustable ring member I24 secured by a locking screw I23. It will thus be seen that the adjustable member I24 may be rotated and adjusted by loosening the locking screw I23 to increase or decrease the tension of the spring I I9. The bracket I2I is held in vertical position by the ring I110. The sand holder II'I comprises cylindrical member I50 having a lower flanged portion I25 with apertures I20 and a cone shaped member I21, a yieldable washer I23 being provided between the members I50 and I2'I to provide perfect seating of the yieldable sealing member I29 secured to the bottom apertured side I33 of the member I2'I by bonding. The members I59 and I2'I are connected together by screw members I3I extending through the apertures I26 in the flanged portion I25 of the member I50. I have shown for illustration a suitable mold I32 for forming acore and having apertures I33 aligned with apertures I34 in the sealing member I29 and in the bottom side of the member I2I so that sand in the sand holder II'I may pass through the apertures I34 and I33 and into the mold I32 to form a core or any other suitable molded product. A sand hopper I40 is supported by a bracket I4I extending from bracket 4 and it has an apertured portion I42 adapted to be alternately engaged by the upper end of the sand holder I I1 and the spring-urged closing member I43 which automatically closes the apertured portion I42 of the sand hopper I49 when the sand holder H1 is pulled away therefrom and which automatically moves out of closing relationship with the apertured portion I42 of the sand hopper I40 when the sand holder I I1 is forceably engaged therewith. The closing member I43 is urged to a closing position by torsion spring II9.

In operation, the mold I32 is disposed on the base I of my novel machine and secured in alignment with sand holder I21 and sealing member I29 thereon. The sand holder I I1 is then swung by utilization of the handle H8 underneath the sand hopper I40 wherein it is filled with sand especially treated to make it viscous to form cores or molds. After the sand holer I I! is filled, it is returned to its original position over the mold I32 and in alignment with the seating member 02 and the sealing member 69 carried on the underside thereof. A suitable source of compressed air is provided for the reservoir 2 through the inlet I3 which automatically raises the check valve I2 from seat 68 in seating member 62 to permit the seating member 62 and skirted member 24 to be filled with air or other suitable fluid. Likewise air passes throug he pipe line 95 past the check valve 97 and through thepipe 94 and aperture 32 to force the piston upwardly in the chamber 33. The valve handle 93 is then brought to an opposite position thereby connecting the air line 95 through the valve member' 92 to air lines 39, 88 and 81 whereby air passes through the aperture 9| in the head 35 and the aperture 3| in the wall member 20 to force the pistons 2m and 40, rod 42 and piston 49 downwardly. The skirted piston 20 moves downwardly until it is stopped in its downward movement by the seating of the sealing members 03 and I29 on the sand holder I I! and the mold I32 respectively. The pistons 40 and 49 continue to move downwardly whereby the piston 49 compresses the air in the seating member 02. The piston 49 continues to move downwardly until it engages the upper side of the piston 52, whereupon the piston 52 is moved against the force of the spring 56 and the valve head 59 on the rod 51 is moved from its seat 60 to release the air into the sand holder II'I. As the piston 49 moves downwardly, the air will be compressed to a greater pressure than the pressure of the air in the line I5 thereby closing the check valve I2 and permitting the air to remain in the seating member 02. from the sand holder II'I are closed by the diaphragm 85 through the pressure of the air in the line 81 when the handle 93 is actuated to open the passage of air to the lines 81, 88 and 89. The handle 93 is then actuated to cut off the supply of air to pipes 91, 88 and 89 and pass the air to the pipe 94 and aperture 32 to raise the piston 40 to the position shown in Fig. 4. The diaphragm 85 permits the passage of air through the apertures 89 and 90 thereby permitting air under pressure in the sand holder I H to escape through apertures 94 when the air supply in pipes 81, 88, and 89 is cut off by the valve 92. The valve head 59 is forced upwardly by spring 56 immediately after the air is released on top of the pistons 20 and 40 respectively. The valve 92 has an exhaust port shown extending from the top side thereof for releasing air above the pistons 20 and 40, respectively, in sequence upon operation of the handle 93. The sand holder H1 is moved away from the mold I32 by spring member I03. The seating member 52 and piston 20 are moved upwardly by the piston 49 which moves with the piston 40 when air passes through the pipe line 94 and apertures 32 in the wall 26. The distance that the valve head 59 moves outwardly from its seat 00 is regulated by the distance which the piston 49 moves downwardly in the cylindrical member 24 and this in turn is regulated by the stop member 45 on the upper end of the rod 43 which engages the abutting surface 4I- on the capmember 35 to limit the movement of the piston 49. It will be noted that sufiicient air pres sure will be maintained in the line 94 and cylinder 33 to maintain the piston 40 in an uppermost position as shown in Fig. 4 because the check valve 91 will prevent the evacuation of air from the line 94 when the pressure in the reservoir 2 is reduced suddenly. My machine is particularly adapted to permit the use of reduced pressures in the supply lines in the operation of my novel sand blowing machine in that it has been found that pressures in the average compressed air line in the shop are not enough to properly blow the viscous sand from a sand holder to a core box or mold.

It will be evident from the foregoing that I have provided a novel machineforblowing viscous sand from sand holders'into a mold which The apertures and 99 leading v which automatie l in reasesthepres-s sure f the air to provide. a. reatly, increased air pressure t blow the sandfrom a sand holder. nd ne with n v l,struetiiralieatures which, m kes. the .machinin r assembly, repair and repl cemen i part N lly simple economical and fio ent. s V

A, vertical rack. .71 0 vlseeii ed. to the. de of serv ir} andsit. is. en assd'by a ear. 61 m unted shaft; 627, which is. ioumalled fin; pertur s 63. n. bracket 4|. shaft." H52. n. o wardly xtendingsquare end 6 forena n as-o ans l wlfiiw hown .in'Fig Byroation .ofiut a. a dles 1,65, the. member 2 .1 and soc ated pa ts of my ma eniayibe moved vert ea ly to desired p. tiont.

A thouehl thavedeser bei mach ne as o f r b ow n andinto mo ds t iwill' vide t hat when l spea sn sanil mean. asand w ich is m x with u table, conve t al scous. products t ma se .it i t as-oompact mo d,

Various hanges maybe made. in t e. specific embodiment .ofmmxi en ion without de a n om the s irit the-rect irqmthe. scope of the. append d laim -s W at 11 0.1.8! i

24A moldblowinetmaehine omnri i eaye elly dis os d y ind r. patina independe t p r n l wer chambe s answer p ston sl able in, said upper .chamber.. anp stq ha ing a depend n T skirt d po t o s idablel in. sai

ow r hamber, fiHSOLl QQ o air; ai l nes. com

s i to t upper ends of, .sai.d-ehambers and d soumeofain. control. meansinsaid, air. lines r I iQ11i1 g the peration..of.said istans. in. idehambe s an a ertured wallsenarating .said hambe s, a compre sion piston .slidable. in the kirted p rtion .nf said last mentioned oha nber, s

a p s on o inonn eting said. pow r ,.piston and d ompres i p ston extending t gh saidaPeI -ed Wa la a ho ow seatin -remembe at:

ta h t the ski ted mention of, said pi ton,

said l we e iamber hav n anpii etport there: in,, .a=ya nsai toutlet port .in-said.seatine m ersfor: open-insand c osing Esama p pe c n n et ns om. sa d ho low @se tin membe .t

sai s ur e ofaair. an-aper redm stom slidab'le in a said s i ted portionf.--.s id p sto said.

lower chamber in opposed relationship tozsaid compression; piston ,slidable thereinaand en,

eae a l by said co pression p st n, a shafte m nesting said apertured piston and sa d valves-a p n su ro nding s id s a t ursinesa ap ntured piston and valve movablet erewith 1- pm wardly whereby saidval-ve, is; urged; to. a cl s d p o n he. outl t. p rt o aidtse tinesmem-t her, a supp tor aideylindena d a sandholder attached-to: s idsupnor-t swineable-inte axial alignment -with ;said seatin member w re y e movem nt-eisa dseatingl member 1 s arr st d i it dow ward mov ment and saideomnression ri enr-eomn esses the-air i v said sea i smemberv -.0 .a. r hrou h. .oomieeti n 2. A smqldb owin i chine "a t -iorth-in v claim 1 wherein said piston rod has an extene si n "e tending. throu h .th .Hi?er1 d sa d ylinder and 33' i fi liicall ya .aiiilistableaabutting; membenais atteehed-to i enPPeL-end oi. said 41 from ,said source; pt:-

exten i s dabuttine em ga i the top of saidcylinder to limit .thetdownwardmovee me t of said co p e on pis on in en a m nt with said apertured piston, thereby limiting the movement of said valve movable with said lepertured piston away from the .outlet port-in said seating. member.

.3. A machine for blowingsand intoa mold comprising two vertically aligned cylinders, an aperturedwall betweensaid. cylinders, a power piston slidablein said upper cyl nder, a piston having a depending skirted portion slidable in said lower cylinder, a compression piston movable in .the skirted portion of (said piston insaid lower cylinder, a pistonrod (extending, through said .apertured wall connecting said power piston and. said compressionpiston, .a. source of air, air connections between the .upper ends of Said cylind an sai so rc o air! an n rol meanstherein to move said pistons in said 'npper and lower cylinders, a hollow seating member attached to the skirted portion of said piston in said ,Iowercylinder, a support'for said cylinders, a swingable sand holder attached to said support swingable in alignment with said seat ing member andlengageablethereby upon the downward movement thereof to arrest the downward movement thereof, a valve in said seating member for releasing air. into .said fsand holder when. the movement of said skirted portion of said piston in said lower cylinder is arrested by said sand holder, connectionsfrom said seat.- ing member to said source of air, and a valve actuating member attached to said valve engagedbysaid compression piston upon a predetermined downward movement thereof to open said valve to releasev air fromsaid seating.memher to, said sand holder Whencsaid skirted portion of said piston in. said lower. cylinder is arrested by said sand holder, ,said compression piston compressing the air in said seating member prior to the release thereof by the opening of said valve.

4. A machine for blowing sand into a mold as setforthin claim 3 wherein said seating mem= ber, has an auxiliary passagev therein leading fromthe portion thereof engaged by saidsseating,memb,er, and a check valve isxdisposed 'in said passage to automatically release the air in said "sand holder after thevdownwardmova ment of said power piston has been stopped."

5. Amachine for blowingsand into a mold,

comprising a vertical cylindrical member-hav me an. n m i e ur d wall definin an upper and a lower chamber, a power piston-slid able in said upper chamber, a piston ghaving'a depending skirted portion slidable in said lower chamber, a compression piston comparatively smaller than said power-piston movable in-theskirted portion ofsaid piston-in said lower chamher, a piston rod extending through said intermediate. .apertured wall connecting saidpower piston and said compressionpiston, a source-oi airv therefromtooperatesaid pistons, a hollow seating member connected to theskirted portion of said piston in said lower chamber having. an outlet therein in axialalignment with said piston: d, t s n -u ed a eins ou let for 'opene ing. and closing.- same, a source/of airsand. connections therefrom to said hollow seating member, a support for said cylindrical member, a sand holder swingably attached to said support and swingable into axial alignment with said seating member for arresting the downward movement of said seating member, and a valve actuating member connected to said valve and extending upwardly into the skirted portion of said piston in said lower chamber engageable by said compression piston upon the downward movement thereof to move said valve to an open position and release air into said sand holder when said seating member and said piston attached thereto are arrested in their downward movement by said sand holder, said compression piston compressing the air in said hollow seating member upon the downward movement thereof prior to the actuation of said valve.

6. A machine for blowing sand into a mold comprising juxtaposed upper and lower cylindrical members, an apertured wall separating said cylindrical members, a power piston slidable in said upper cylindrical member, a piston having a skirted portion slidable in said lower cylindrical member, a compression piston comparatively smaller than said power piston slidable in the skirted portion of said piston in said I lower cylindrical member, a piston rod extending through said apertured wall connecting said power piston and said compression piston, a source of air, pipe connections from said source of air to the upper ends of said upper and lower cylindrical members and to the lower end of said upper cylindrical member for reciprocating said pistons in said cylindrical members, control means in said pipe connections for admitting air to the upper ends of said cylindrical members and exhausting air from the lower end of said upper cylindrical member and for admitting air to the lower end of said upper cylindrical member and exhausting air from the upper ends of said cylindrical members, alternately, a hollow seating member attached to the skirted portion of said piston in said lower cylindrical member, a pipe line connecting said source of air to said hollow seating member, an apertured piston slidable in said skirted portion of said piston in said lower cylindrical member in opposed relationship to said compression piston slidable therein, a valve in said seating member in axial alignment with said power and compression pistons for releasing air from said hollow seating member, a shaft connecting said apertured piston and said valve, a spring surrounding said shaft urging said apertured piston towards said compression piston whereby said valve is urged to a closed position, a support for said cylindrical members, and a sand holder swingably attached to said support swingable into axial alignment with said seating member and engageable thereby upon downward movement thereof to arrest the downward movement of said seating member whereby said compression piston engages said apertured piston to move said valve to an open position, said compression piston compressing the air in said hollow seating member prior to the release therefrom upon the opening of said valve.

7. A machine for blowing sand into a mold as set forth in claim 6 wherein said source of air comprises a vertically extending, hollow cylindrical member having compressed air therein to which are attached supporting brackets ver- 10 tically movable thereon and attached to said cylindrical members to support same.

8. A machine for blowing said into a mold comprising juxtaposed upper and lower cylindrical members, an apertured wall separating said cylindrical members, a power piston movable in said upper cylindrical member, a piston having a skirted portion slidable in said lower cylindrical member, a compression piston slidable in the skirted portion of said piston in said lower cylindrical member, a piston rod extending through said apertured wall connecting said power piston and said compression piston, said compression piston being comparatively smaller than said power piston, a source of air, pipe connections between said source of air and the upper ends of said cylindrical members and the lower end of said upper cylindrical member to move said pistons in said cylindrical members, control means in said pipe connections for alternately admitting and exhausting air through said connections, a hollow seating member attached to said skirted portion of said piston in said lower cylindrical member having an auxiliary passage extending outwardly from the bottom thereof, a spring-urged valve in the bottom portion of said seating member, valve actuating means connected to said valve engaged by said compression piston upon the downward movement thereof to open said valve, a diaphragm normally spaced from one end of said auxiliary passage in said seating member normally sealingly engaging said passage, a pipe connection from said pipe connections to said cylindrical members to said casing containing said diaphragm for moving said diaphragm to sealingly engage said passage when air moves said power piston downwardly, a support for said cylindrical members, and a swingable sand holder connected to said support and swingable into axial alignment with said seating member for arresting the downward movement thereof whereby said compression piston, after compressing the air in said seating member, continues to move in the skirted portion of said piston in said lower cylindrical member to engage and move said valve actuating means to move said valve in said seating member to an open position to release air into said sand holder, said diaphragm sealingly engaging said auxiliary passage in said seating member moving to an unsealed position when air is exhausted from said upper cylindrical member above said pistons therein.

RUSSELL W. TACCONE.

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

UNITED STATES PATENTS Number Name Date 1,272,651 Foster July 16, 1918 1,441,900 Warren Jan. 9, 1923 1,451,303 Mitchell Apr. 10, 1923 1,677,781 Joyner July 17, 1928 1,910,417 Zeman May 23, 1933 1,923,333 Soter Aug. 22, 1933 1,950,632 Romph Mar. 13, 1934 1,994,028 Rolif Mar. 12, 1935 2,279,364 Cadbury Apr. 14, 1942 2,490,559 Taccone Dec. 6, 1949

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