US3169285A - Overhead squeeze molding machine - Google Patents

Overhead squeeze molding machine Download PDF

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Publication number
US3169285A
US3169285A US133700A US13370061A US3169285A US 3169285 A US3169285 A US 3169285A US 133700 A US133700 A US 133700A US 13370061 A US13370061 A US 13370061A US 3169285 A US3169285 A US 3169285A
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United States
Prior art keywords
squeeze
frame
sand
head
flask
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US133700A
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English (en)
Inventor
Edmond K Hatch
Leon F Miller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osborn Manufacturing Corp
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Osborn Manufacturing Corp
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Filing date
Publication date
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Priority to US133700A priority Critical patent/US3169285A/en
Priority to GB44103/61A priority patent/GB950008A/en
Priority to FR883178A priority patent/FR1313381A/fr
Priority to DEO8481A priority patent/DE1234940B/de
Application granted granted Critical
Publication of US3169285A publication Critical patent/US3169285A/en
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/10—Compacting by jarring devices only
    • B22C15/12—Compacting by jarring devices only involving mechanical gearings

Definitions

  • This invention relates generally, as indicated, to an overhead squeeze molding machine and more particularly to a machine for making sand molds incorporat ng an overhead mechanical squeeze action and an optional jolt.
  • Yet another object is the provision of an overhead squeeze molding machine wherein the ram is positioned above the sand squeeze thus lengthening the life of the machine.
  • a still further object is the provision of apparatus for quickly and easily assembling a mold box and pattern plate in position for an optional jolt action and a subsequent overhead squeeze.
  • FIG. 1 is a side elevation of the present invention .show ing in phantom lines the squeeze head in its optional nonoperative position; I Q 7 j FIG. 2 is an end elevation of such machine asseen from the left in FIG. 1 partially broken away;
  • FlGQ3 is an endelcvati'on' of such machine as seen from the right in FIG; 1; 5
  • FIG. 4 is a top plan view of such machine
  • FIG. Sis an enlarged detail sectional View of thedraw frame
  • FIG. 6' is a vertical section taken substantially on the line 66 of FIG. 5; T
  • FIG. 7 is a schematic hydraulic diagram illustrating the operation of various components of the present invention.
  • FIG. 8 is a schematic piping diagram of the pneumatic system illustrating the operation of various components of the present invention.
  • i "FIG. 9 is a schematic electrical diagram illustrating the.
  • FIGS. 1, 2'; 3 and 4 the machine is comprised of abase lfof the triangular configuration. shown more clearly in FIGiyl.
  • Side frame members'Z and 3 close theends of such triangular base 1 and four corner legs 4, 5, 6 and 7 extend upwardly from the corners of the base with-the pairs of legs'4and 5:
  • top framing 1t), 11 and 1 2 also-supports vertically spaced pairs of bearings 16 and ITwhich in turn receive guide pins 18 and 19 respectively which extend through such framing and aresechred to overhead squeeze frame 20.
  • the rod'14 of the ram or cylinder 13 is also centrally secured to such frame 20
  • the framing lthll-and 12 also supports bracketsSZS,
  • brackets 29 and 30 which support elongated frame members 31 and 32 which in turn have inwardly directed conveyor rollers as shown -at'33 and 34 mounted thereon. These conveyor rollers support a sand carriage 36 for horizontal shuttling movement from a charging to a flask filling position.
  • Such carriage includes a frame 37 having a cutofi plate 38' mounted on the top thereof which has an opening therein, which when the carriage is aligned in the FIG. .1' posi' tion, will permit a charge of sand to fall fromthe hopper 27 through such opening into a sand box 39 which is suspended beneath the carriage 36.
  • Thesqueze head carriage frame 31 is provided with I an extension-91 which has a pin 92 which engages with 'a downwardly opening U-shape latch member 93 eX-- r tending from:,the sand carriage frame 37.
  • the operating v rods pivot thelouvers 52 which are 'pivotallyconi 55fanclf56'which nare part of the frame 46, allof which e are vertically adjustable with respect to the'lcarria ge frame 37.; W
  • sand"car'riage frame is not 3 It is noted that the'wear orcutpfi plate 38extends subs t'antially' beyond the; hopper 27 in the position shownin off to prevent further flow of. sand from the hopper.
  • the shuttling movement of the sand carriage. also serves topos'ition an empty flask in V the niachine'sby' 'i rne'an's of a menu pivotallylmountedq on a depending arm 68which is secured tome sandbox as shown at 69.
  • Thelegs S and 6 similarly support'brackets 75 and 76' respectively which in turn supportconveyor frame mem-: y hers 77an d" 78 having inwardly directedconveyor rollers i and 80 thereon, These conveyor rollers are horizontallysaligned. and support forvhorizo ntal shuttling move "ment'squeezefhead frame 81 having the squeeze head 8Zpendently mounted thereon.
  • Rollers 83 and 84 may 1 befrnounted onfsuchframe about vertically extending axesbearing againsttheconveyor frame members 77 'and 7 8 Vto keep the squ eeze head and squeeze head frame"; properlygaligned in the machine.
  • the frame81 may be 7 provided with a'bo'ttomplate 85 to which is secured the plate ⁇ "ofth'e squeezehead 8 2. Any suitable fastening y'b'efmployed to secure the :squeeze head in frame and suchcan readily' be removedif: desired.
  • the squeeze head 'o the comprisedof a pl urality of downward-1y projecting cylinders 87,-having pistons ther'ein with the pistonrods 88 projecting therefrom and having squeeze biscuits or feet 8 9 mounted on the distal ends thereof adapted to 1 'eng'age the molding sand within the flask F positioned thefeberiea'thin the full l ine positionlof the squeeze head a r 7
  • the individual squeeze piston-cylinderv as'sem lies; may be manifolded or individually operated tQobtain different pressures thereon, but in any event, reference inay'be had to the copendingapplication of Ed'-' @mond K. .H'atch'and Leon F.
  • the'squeezeyhead frame 24) ' which 'is mounted on the piston or ram rod 14 includes downwardly projecting side'portions' and W5 each of which has inwardly-directed bottom edge portions as withthe conveyonfrarne members 31 and 32 in the FIG. 1 position,;
  • the omega-shapeframe 20 then pro? vides.
  • the conveyor, framernembers 99 whichhave inward I ly directedgconveyorrollers 100 thereon-which are horizontally' laligned I with the" rollers' ong t'n'e corresponding ⁇ I conveyor frame members to, provide La" continuousihoriv zontal conveyor forthe sand1 carriage and squeeze head? carriage-when the-"squeeze frame '20 is intthe raised or.
  • he squeeze head fram'e is provided' an upstanding bracket 102 which includes two adjustable stopscrewsflllii adapted to bear against the squeeze frame 20 when the squeeze head is inthe full line position shown in-FIG; lwhereinfit will be aligned. with the flask F positioned directly therebeneath.
  • ThEi mOVEII'LBHt of the, sand carriageand the squeeze madame-squeeze head" a carriage is thus obtained by means of the pair'ofpistoncylinder' assemblies 6t and 61 and retraction-of such pistoncylinder assembliesiwill cause the sand carriage to v move to the left and the squeeze head and squeeze head; -c arriage latched thereto through the latched mechanism 91 through 93 to move therewith until the stop screws- 103" engage the side. of the squeeze frame 29.
  • .' table is mounted on jolt piston 119 which fits within jolt cylinder 111 which in turn ismounted in annular cxtension ;1 12 which is mounted on -annular frame 113 within the. base 1.
  • The'extension' 112 is provided with opposed ears 11ft and'1 15 which have bearings 116 therein to ac commodatevertically movable aligning pins H7 and 113 .which extend through the piston top ligand are secured ;to the table T-.
  • the annular piston'tops presents a sub- 55 s'tantial mass and firmly supports the table T'thereon.
  • air line 120 may be provided supplying air to the blind end of the jolt cylinder 111.
  • a cradle frame 13i? comprised i a 137 and 138 positioned at the sides of the machine frame "of two end'frame, members 131 and 132 and two side" frame members 133 and 1 34-.”
  • Such frame is mounted on the piston rods136' of two piston-cylinder assemblies with such rods directly supporting the side frame members 133 and 134 (note the detail view of FIG. 5).
  • Each of the sideframe members 133 and 134 is provided at its end with vertically extending short stroke piston-cylinder assemblies 139 and 140.
  • each of the dash-pots or small piston-cylinder assemblies is provided with a clevis or like'member 147 which is pinned to the respective frame as shown at 148.
  • the cylinder 149 for such piston-cylinder assemblies 139 and 148 may be incorporated as partof the frame 133.
  • a squaring shaft assembly is provided ensuring conjoint operation of the piston-cylinder assemblies 137 and 138, such assembly including a pivot shaft 151 mounted in bearings 152 and 153 or pillow blocks secured to the outside faces of the legs 5 and 6. Arms 154 and 155 keyed to rotate with the shaft are pivotally connected to links 157 which are in turn pivoted tothe side frame able fasteners such as screws 161.
  • Each of the draw pinsv 16% extend up between the rollers 144 on the roller frames mounted on the rods of the piston-cylinder assemblies 1139 and 146 and such draw pins extend to a position slightly below the topsof the rollers in the maximum elevation of such rollers as provided by the pistons 145.
  • elevation of the pistons of the piston-cylinder assemblies 139 and 149 will cause the lower flange of the flask F to rest upon the rollers 144 and when the pistons of such assemblies are retracted through a short stroke
  • the lower flange of the flask will rest on the tops of the draw pins as shown at 162.
  • the conveyor frames 142 and 143 may be provided with top guide rails as shown at 167 in FIG. 6 closely to confine the flask flange 163 whereby it will be centered in the machine and aligning pins 169 may be provided properly to center the flask with respect to the table and pattern thereon.
  • the squeeze frame 29 will be retracted or lifted carrying with it the squeeze head and continued upward movement will cause the stops 177 and 178 to engage the latches 171 and 172 pivoting them to the position shown in FIG. 3 against the pressure of springs 175 and 176 so that the squeeze head will now be free to move laterally on the con veyor rollers 75 and 8t It is noted that'the raising ofthe squeeze head will cause the pin 92 to engage in the latch member 93 again to couple the sand carriage and the squeeze head carriage together for movement as a unit.
  • the draw frame With the dash-pots 139 and 14d lowered, the draw frame will now be elevated supporting the mold comprised of the flask and sand therein on the four draw pins 16! and elevation of the dash-pots 139, 148 will elevate the rollers 143 and 144 lifting the mold from the draw pins and aligning the conveyor on which the flask rests with the entry and exit conveyors.
  • FIGS. 7, 8 and 9 For a more detailed description'of the operation, reference may be had to FIGS. 7, 8 and 9.
  • the main selector switch 209 is turned on v switch 21% energizes holding relay 211 which holds in A pressure 7 for the complete ccyle.
  • switch'212 which energizes the sand box forward sole- 7 rioid 213 through normally closed switch 21d andclosed v lir'nitswitches' 215, 21 6 and 217.
  • ' ilimit switch 217 has another set'of coh'l h 213 which a 4 contacts-217 open energ'izi'rig draw frame dowri' solenoid 2l9 andrelay 220. It will, of course,
  • solenoid 22 l'opens I the louver sof the sandbox to'du'mp the charge ofsand" in the assembled flask and pattern plate'andf at the same T time the jolt action begins; through the energization of solenoid'223, if ajoltaction is" desired.
  • the relay 242" also opens contacts 247' in series with the hold pressure on signallight 248which' was energized'by the closthe outletline of the 8 gallon capacity pumpr 2f ll will keep .the higher pressures in the outletoft'the pump'258 from ingot contacts 244 and'243.
  • tRelay'249 in parallel with the signal light M3 is also energized to close, contact 25d which is in series with limit switch contacts'ZSl and 252 operatedby the draw frame and squeeze head being up ⁇
  • the opening of the contacts 2e7 deenergize's the hold pressure on signal light 248 and the'subsequent raising of the squeeze head ordraw frame will close con tacts 251' or 252 to provide a holdingcircuit for relay 249.
  • Relay 242 also opens contacts 253 to deenergize thefdraw frame down solenoid as Well 'asthe squeeze headdown solenoid 233.
  • the solenoid 255 isenergized en- 'surin'g that the dash-pots are in the lower'po sition and that the flask contacts the stripping pins 156.
  • the eneragization of-the solenoids245 and-246 starts the draw frame and squeeze head up and when the timer 241 opens V contacts 256 to deenergiz'e solenoid 257,the'slow draw solenoid 257 willthus be deenergized and the draw frame will continue up at a higher velocity.
  • the draw 7 frame and squeeze head have reached their maximum po- 7 sition, they will open respectively limit switch contacts V D 259 and 26) to deenergize the cycle relay 211 which, of
  • the hydraulic system is comprised of a reservoir 265 which may be, for example, 1350 gallon tank which "tpplies'throughfilters2&6 and 267 the '8 gallon per min-- ute pumpZL a 25 gallon per minute pump 268, 'ai75' L gallon-per'minute pump 26% and a 25-gallon per minute pump 27d? of such pumps are driven frohr the pump motor 2491.
  • the outlet of thie pump 258 leadstthrough a flow control "valve "271 ;.-thr'ough pressure switch 234 cause the squeeze head .to move Idownrapidly,
  • Relief valve 276 provided in the outlet of pump 2 58 which isfoperated by solenoid 235;such1 valve being. in series with anunlo'ad'ing valve"277'which' may beset, for.
  • the unloading valve 283 may be set to unload at approximately lfifii) psi. and a relief valve 284rnay also be employed operated by a solenoid 285 which may be operated simultaneously With the relief valve solenoid 23 5. Fluid'may also; be supplied through line 286 hav-- ing a 300 p.s.i.-unloading valve 287 therein through a double solenoid operated'four-way open centervalve 288 j b which operates the cradle or draw frame lift. cylinders 137 and 13% *The valve 288 may be operated by solenoids 2 l5 and 21% selectively to raise and lower the draw frame;
  • Line 3tl5 connects the source 3M) with a two-way or shutoff spring return solenoid operated valve 3% which is operated by solenoid 223 to control the operation of the jolt piston 11%.
  • a line 30'! conmeets the source 309 with a four-way solenoid operated valve 3'68 operated by solenoid 255 to control the operation of the four dash-pots 13%, 149 to raise and lower the draw frame rollers from the drawing pins 169.
  • a foundry molding machine capable of an extremely fast cycle with such machine cycle including an optional jolt in addition to a mechanical overhead squeeze.
  • Such overhead squeeze is provided by a stationary overhead squeeze piston.
  • the shuttling of the sand charge into the flask charge position from the fill position temporarily removes the squeeze head from the squeeze ram and replaces it when the sand box moves back to the fill position whereby the squeeze head will be in position properly to squeeze the thus sand charged machine.
  • a uniform predetermined squeezing pressure may be applied mechanically to the top surface of the sand mold.
  • the predetermined squeeze pres sure is obtained, it can be held through the use of a timer before the squeeze head is removed and the mold drawn.
  • This holding action may be employed to permit squeeze heads having relatively movable sand engaging portions (cg. multiple pistons, diaphragms) properly to adjust to apply such predetermined pressure uniformly over the surface of the sand mold.
  • squeeze heads having relatively movable sand engaging portions cg. multiple pistons, diaphragms
  • shuttling movement of the sand charge is additionally employed to charge the machine with empty flasks and remove the completed molds.
  • the machine may be employed with the jolt action only, or vice versa, it may be employed with the mechanical squeeze action only do pending upon the requirements of the particular foundry.
  • a foundry molding machine comprising a frame, a squeeze piston cylinder assembly secured to an upper portion of said frame, a squeeze head support, and a squeeze frame secured to the piston of said squeeze piston cylinder assembly for vertical movement therewith, said squeeze frame comprising a horizontally extending conveyor section, a squeeze head, means to shuttle said squeeze head from said support onto said conveyor section for vertical movement with said piston and squeez frame, and means to prevent horizontal displacement of said squeeze head during such vertical movement.
  • said squeeze frame comprises an omega-shape frame having inwardly directed flask supporting rollers on the legs thereof.
  • a foundry molding machine as set forth in claim 1 including a sand box operatively connected to said squeeze head for shuttling movement therewith into and out of a position vertically beneath said piston on said conveyor section, and means rcleasably connecting said squeeze head and sand box whereby said squeeze head may thus move vertically with said conveyor section.
  • a foundry molding machine as set forth in claim 3 including means to movea flask with said sand boxto position the same vertically beneath said piston whensai sand box is thus positioned.
  • a foundry molding machine as set forth in claim 4 including support means for such flask thus positioned,
  • a foundry molding machine as set forth in claim 5 including jolt means supporting such assembled flask and pattern plate, and means responsive to the assemblage of such flask and pattern plate to empty such sand box and then jolt the thus filled mold box.
  • a foundry molding machine as set forth in claim 6 including means responsive to a predetermined time delay after the emptying of said sand box to remove said sand box and replace it with said squeeze head on said conveyor section.
  • a foundry molding machine asset forth in claim 7 including means responsive to the position of'said squeeze head vertically beneath said pistonoperative' to energize said squeeze piston cylinder assembly to move said conveyorsection and thus said squeeze head downwardly.
  • a foundry molding machine as set forth in claim 8 including means responsive to a predetermined-increase in pressure in the fluid system of said squeeze piston cylinder assembly further; to increase the pressure therein until a predetermined squeeze pressure is obtained on the sand within such mold box.
  • a foundry molding machine as set forth in claim 9 including means responsive to a predetermined interval of application of such squeeze pressure to reverse the operation of said squeeze piston cylinder assembly to raise said conveyor section and thus said squeeze head.
  • a foundry molding machine comprising an upstanding frame, a squeeze ram assembly fixedly mounted on I the upper portion of such frame, a horizontally movable squeeze head, means to shuttle said squeeze head to a position vertically beneathsaid ram for vertical movement therewith whereby said squeeze head will be operative to squeeze sand within a mold box vertically positioned therebeneath, and means to maintain said head beneath said ram during such vertical movement.
  • a foundry'molding machine comprising a machine means in the up position of said ram adapted to receive said sand box or squeeze head.
  • a foundry molding machine as set forth in claim 12. including means to move a flask horizontally with said sand box to position such flask vertically beneath said ram on said conveyor section.
  • a foundry molding machine as set forth in claim 12 including means responsive to the vertical movement of said squeeze frame to latch said squeeze head in said squeeze frame to preclude relative horizontal movement of said squeeze frame and squeeze head.
  • a foundry molding machine as set forth in claim 12 includingme'ans laterally adjacent said ram to fill said sand box with sand.
  • a foundry molding machine as set forth in claim 16 whe'rfiin said means to fllsaid sand box with saridi-corn Rfereaicesilited in thefile of this patent prise sa'sandphut e, said'sand boxincludi fig' a cuioff plate 1 j U TED STATES PATENTS fwhich mbves with said sand box and cloes said chute f V i Whe'n s aid sand box is poitipnedbencathsaid ram.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
US133700A 1961-08-24 1961-08-24 Overhead squeeze molding machine Expired - Lifetime US3169285A (en)

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Application Number Priority Date Filing Date Title
US133700A US3169285A (en) 1961-08-24 1961-08-24 Overhead squeeze molding machine
GB44103/61A GB950008A (en) 1961-08-24 1961-12-08 Overhead squeeze moulding machine
FR883178A FR1313381A (fr) 1961-08-24 1961-12-27 Machine à mouler à tête de compression en l'air
DEO8481A DE1234940B (de) 1961-08-24 1962-01-16 Pressformmaschine

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3267528A (en) * 1966-08-23 Foundry molding machine
US3347307A (en) * 1961-12-11 1967-10-17 Osborn Mfg Co Pneumatic squeeze head with pressure supply booster means
US3381740A (en) * 1965-07-07 1968-05-07 Osborn Mfg Co Foundry molding machine
US3386493A (en) * 1965-07-07 1968-06-04 Osborn Mfg Co Mechanical lock means for foundry molding machine
US3800851A (en) * 1971-05-28 1974-04-02 Precision Metalsmiths Inc Metal casting apparatus with means for evacuating mold chamber and pouring chamber
US3876360A (en) * 1972-02-08 1975-04-08 Miguel Alvarez Arriaga Duplex automatic machine for the manufacture of concrete blocks
US4091858A (en) * 1974-11-12 1978-05-30 Grigory Mikhailovich Goldring Apparatus for making molds by sequential squeezing

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH622724A5 (de) * 1977-07-22 1981-04-30 Fischer Ag Georg
CN108907117A (zh) * 2018-08-20 2018-11-30 苏州苏铸成套装备制造有限公司 一种经济型单工位静压造型机

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2686345A (en) * 1950-06-08 1954-08-17 Spo Inc Foundry mold-making machine
US2767445A (en) * 1952-08-08 1956-10-23 Taccone Pneumatic Foundry Equi Molding apparatus
US2847735A (en) * 1958-08-19 butler
US2892223A (en) * 1953-08-08 1959-06-30 Buhrer Erwin Moulding machine for the jolting, squeezing or simultaneous jolting and squeezing of moulds
US2959828A (en) * 1958-06-30 1960-11-15 Herman Pneumatic Machine Co Foundry mold forming
US2968846A (en) * 1958-03-05 1961-01-24 Osborn Mfg Co Foundry molding machine
US2985927A (en) * 1958-10-16 1961-05-30 Herman Pneumatic Machine Co Foundry mold forming apparatus
US3025578A (en) * 1958-03-05 1962-03-20 Osborn Mfg Co Fluid weight jolt molding machine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE547750C (de) * 1930-08-15 1932-04-02 Osborn Mfg Co Formmaschine
DE690864C (de) * 1938-12-10 1940-05-09 Badische Maschf Gmbh Mit Druckluft betriebene Formmaschine mit Presskolben
DE966123C (de) * 1951-05-24 1957-07-11 Eisenwerk Hilden Ag Pressformmaschine mit verfahrbarer Pressplatte
DE1093053B (de) * 1955-09-22 1960-11-17 Herman Pneumatic Machine Compa Pressformmaschine mit stationaerem Querhaupt und Wagen mit auswechselbaren Presskoepfen

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2847735A (en) * 1958-08-19 butler
US2686345A (en) * 1950-06-08 1954-08-17 Spo Inc Foundry mold-making machine
US2767445A (en) * 1952-08-08 1956-10-23 Taccone Pneumatic Foundry Equi Molding apparatus
US2892223A (en) * 1953-08-08 1959-06-30 Buhrer Erwin Moulding machine for the jolting, squeezing or simultaneous jolting and squeezing of moulds
US2968846A (en) * 1958-03-05 1961-01-24 Osborn Mfg Co Foundry molding machine
US3025578A (en) * 1958-03-05 1962-03-20 Osborn Mfg Co Fluid weight jolt molding machine
US2959828A (en) * 1958-06-30 1960-11-15 Herman Pneumatic Machine Co Foundry mold forming
US2985927A (en) * 1958-10-16 1961-05-30 Herman Pneumatic Machine Co Foundry mold forming apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3267528A (en) * 1966-08-23 Foundry molding machine
US3347307A (en) * 1961-12-11 1967-10-17 Osborn Mfg Co Pneumatic squeeze head with pressure supply booster means
US3381740A (en) * 1965-07-07 1968-05-07 Osborn Mfg Co Foundry molding machine
US3386493A (en) * 1965-07-07 1968-06-04 Osborn Mfg Co Mechanical lock means for foundry molding machine
US3800851A (en) * 1971-05-28 1974-04-02 Precision Metalsmiths Inc Metal casting apparatus with means for evacuating mold chamber and pouring chamber
US3876360A (en) * 1972-02-08 1975-04-08 Miguel Alvarez Arriaga Duplex automatic machine for the manufacture of concrete blocks
US4091858A (en) * 1974-11-12 1978-05-30 Grigory Mikhailovich Goldring Apparatus for making molds by sequential squeezing

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Publication number Publication date
GB950008A (en) 1964-02-19
DE1234940B (de) 1967-02-23

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