j o. H. W060 ETAL ~ 2,409,330 cons MAKING MACHINE Filed April'lz, 1945 ' 3 Sheets-Sheet 1 . Patented Oct. 15, 1946 2,409,330 UNITED“ STATES PATENT OFFICE GORE > David Howardv Wood, Barnt Green, and Herbert‘ James Roe, Knowle, England Application April 12, 1945', Serial No. 587,9881 In Great Britain November 20, 1943 - 1; 2. Claims. (01. 22~1o> 2 The invention.v relatest'o core‘ making machines air maybe forcedto drive down the piston- so-that or, as they are" perhaps more: frequently called, its rod I‘! will rock a bell-crank lB-to one arm of coreblowing; machines of the kind in which the which it is connected and the‘ other arm of the divided material of‘ which the cores are to be bell-crank is preferably equipped with a roller. 19 made; usually sand’, is fed': into" a container. or 5. and engages an end disc 20 closing. a tubular magazine above a table on‘which‘the core box is plunger 2! in a guide 22, and the top of‘ this placed and an air stream is charged into the plunger is flanged andbolted. to the underside of container or magazine under‘ pressure and: the the table [3. A spring. 23: around the piston rod sand is blown or forced through'apertures in the in the cylinder |6~ assists the weight of the table base plate of the: magazine: and. into. correspond ingv apertures in; the c’ore'box' leading to the‘ cavity or cavities in which the core or» cores is to‘be formed‘. The improved machine: according‘ to‘ this inven~ tion provides a combined pneumatic and-hydraulic arrangement for moving- the" sand container or magazine unit to any. desired distance within its range from’ the table, which arrangement gives _ a very smooth and even movement. The improved. machine also has a convenient and simple means-for imparting at small, even in returning. the parts and the piston [5. The surface of the table is preferably provided, with removable, hard steel plates 2H bolted in posi tion. On. each side of the table l3 rigidly secured‘ in the bed or base casting H1 is an upstanding pillar rod 24 and upon these two pillars 24 is suitably guided the sand container or magazine II. The guiding means comprise a pair of split bearings i'ii'projectingi laterally from the sides of the body of the magazine and av second pair of split bear movement to the: table towardsthe magazine for ings 2‘6-near the lower part of the magazine, both pairs being capable of sliding on the pillars 24 clamping thev core box‘, placed upon. it- securely to the/underside of the container or magazine. so that .they can be ?xed on the pillars in order and. both being equipped with clamping means Other featuresof» the machine will be pointed 25 to set the magazine at thedesired height. out‘ in’ the: followingvv description; oft a preferred The clamping means shown‘ comprises a screw embodiment which~ is illustrated in- the‘ appended: rod 21 anchored-in a lug 28 of a split bearing and drawings; and the scope of the protection desired working in. a, tapped bore in a second lug 29 to is: de?ned-int the claims hereinafter appearing: draw the two- together when the handle 30‘ is Figure 1 is a front view of the machine with 30 appropriately turned. The sand magazine H is parts broken. away, and a; sand feedh'oppe'r‘ and directly over the table‘ i3 and the. pressure plate a motor omitted from thetop-of the- ?gure. . Figure 2 is a side‘ view thereoi; but showing M which also acts as a. sand delivery plate, at the base of the magazine is opposite the table surface part of the hopper. so that a core mould box placed on the table Figure 3 is a sectional view’ of' part of the base 35 be clamped: securely between the table and bottom of the sand. containing magazine by of the machine showing. themeansior moving. the forcing of the table upwardly by the piston table. Figure 4 is a part‘; sectional viewvoi the’blowing? bell-crank means already described. This container or magazine. ward movement need only be small since can the the and up the In this embodiment of the machine: i0: is the 40 sand container will‘. be set to suit the depth of base casting, H- is the blowing container or'maga' the box, and it is only the clamping and sealing: zine for the sand-and‘ I2‘ is the hopper by which of the box against the pressure and. delivery plate the sand is fed in the desired amounts; to: the ofv the sand magazine that has. to be effected" by container or magazine; I l. Thetable which. sup the table movement. ports/the moulding’ boxes of various’ sizes is re 45 The upper part of each pillar 24 is enclosed in ferred to by'the numeral i3», and the substantial a cylinder 31, the lower end of which is bolted: to pressure plate and sand delivery plate-at the base a stout ?ange 32 on the upper guide bearing 25 of the magazine, which is opposite the table and of the sand container or magazine HI, and thisv co-operates with it. in the clamping of- the box, cylinder 3 I‘ is closed above the top of the pillar by is. marked Id. ' a plate‘ 33" through which a small ori?ce 34, or Forf'this purpose: of‘ clamping the box. thetable more than. one, will be provided. Above this per"? I 3' is adapted for a small upward. movement with forated closure plate an enlarged pressure cham respect to the‘ substantial bed. or casting; Hi? the ber 35. is provided, the purpose of which is to re“ means for this purpose‘. comprising. a. piston‘ l5: ceive a suitable fluid such as oil and provide‘ an moving; in a. cylinder l6‘: above which. compressed air space above‘the ?uid to. which compressedair 2,409,330 0 _ ' 3 can be led. The enlarged, ballon-like chamber 35 35 at the top of the pillar cylinder 3| have been gives effective storage without increasing head subjected to air pressure to raise the sand maga Zinc II to a given height for a particular box, 'or series of boxes, and the magazine bearings room demands, and the restricted ori?ce ensures a slow, smooth movement and a dashpot eiTect, when pressure is released. As there are two cylinders 3 I, one on each pillar have been clamped securely in that position, a core box has been inserted, and the table raised 24 there are two enlarged pressure chambers 35 and a common connecting air pipe 33 between by admitting compressed air in the cylinder I6 magazine guides 25, 26, have been released, the air pressure will drive the oil through the small ‘-‘balloons" 35 is‘ released and, after the' clamps are slackened, the sand magazine with its‘agita tor and motor unit will'retu‘rn slowly down the above the table piston I5 to clamp the box and make a sandtight joint between the openings in them can be provided with a compressed air lead 31 so that the pressures in the two chambers will 10, the pressure plate I4 and those in the core box, the air pressure is admitted to the annular cham be equalised above the level of the ?uid therein. ber 4| , above the pressure plate and the motor The oil may be inserted through a cock at 38 and 58 is startedto drive the agitator arms 49 and drained when necessary by a tap 39 below the paddles and the ‘core or cores in the box is/are ori?ce 34 and above the point of maximum entry 15 rapidly blown and so formed. The table cylinder of the pillar 24. I6 is then exhausted and the table I3 moves down The upper end or face of each pillar 24 is pro~ under gravity reinforced by the spring 23 and vided with a suitable removable piston face 40 returns the bell crank I8 and piston I5. The to act as a piston against the walls of the cyl ?lled box is then removed. inder 3|. If compressed air is admitted to the If the box height is to be varied the air pres upper parts of the pressure chambers 35 when sure- above ‘the oil ‘in the pressure chambers or the clamping means on the sand container or ori?ce 34 in the closure plate 33 of each and against the piston face 40 of the ?xed pillar 24. 25 pillars '24, the oil being forced up through ‘the restricted passages 34, in the closure plates 33 By the reaction of this ?uid between the piston face in the cylinders 3 I . ' ‘ ' and the apertured plate 33 across the cylinder 3I The control of the machine may be made very each cylinder will be raised so as to lift the whole simple by arranging the compressed air supply of the sand container or magazine assembly bode ily on the pillars 24 to any height required above 30 leads to be brought toa suitable multi-way con trol cook 60 for distribution to the table cylin the table. The assembly will then be clamped in der, the pressure chambers or “balloons,” ‘and the desired position by the clamps on the guides the annular chamber 4|. This point is arranged of the container or magazine I I. ‘ adjacent to the agitator motor switch so that The pressure plate I4 at the lower part of the sand container or magazine 'is bodily removable 35 the controls for the table or base, and the motor, may be all assembled Within easy reach of an and bolted in place, and this plate will be pro operative. The part seen at BI is a free jet for vided with the necessary opening or openings through which sand may be driven by compressed cleaning purposes. 62 is a pressure gauge. air admitted to the container to blow the sand We claim: into the shaped cavities in the core box to ?ll 1. Core making or blowing machine having a the latter with the core sand and so mould the container for sand, means including a table for cores required. supporting-a core box below the container, an The lower part of the container has an annu lar chambered part M in its Wall to which the compressed air connection is made at 42, Figure . 2, and provided with an inlet valve 43. The handle 44 of this valve may be coupled to an air exhaust valve at 45 in the magazine so that when the inlet valve is closed the exhaust from the magazine is opened, and vice versa. Within this annular air belt M is arranged a perforated cy lindrical plate 46 covered with a Wire gauze or like sleeve 4'! so that the air is split up into many ?ne streams or jets, and a thorough mixture of the compressed air with the sand takes place as the sand is agitated within the container by the mechanical agitator. apertured pressure and sand delivery plate at the base of the container, means for supplying air under pressure to the container for forcing sand through said apertured plate into the core box, a pair of pillars disposed one at each end of the table, means for guiding the container on the pillars and means for clamping it thereon, a pair of cylinders secured to the container and capable of sliding on the pillars each of which pillars is adapted to act as a ?xed piston in one of said cylinders, combined pneumatic and hy draulic means whereby ?uid pressure may be ad mitted to the cylinders above the piston faces of the pillars for raising said container thereon, and means ?xedly mounted in each cylinder above the pillars to form a restricted passageway for the passage of ?uid from the upper part to the lower part of the cylinder, which means act as dashpots to give a smooth and slow action dur ing ascent and descent of the cylinders and the The agitator may consist of a hub 48 with skeleton arms 49 and paddles projecting from the hub and the hub is secured on a drive spin dle 50 which is enclosed in bearing-bushes BI, 52, carried and enclosed by a stout elbow casting 53 which can be bolted securely against the side container. . wall of the container or magazine bore, see Fig 2. Core making or blowing machine having a ure 4. The drive spindle 50 is provided with a 65 container for sand, means including a table for bevel gear 54 driven by a similar bevel 55 on supporting a core box below the container, an gear shaft 56 projecting from a speed reduc apertured pressure and sand delivery plate at tion gear box 5‘! of a suitable kind in which the the base of. the container, means for supplying input shaft is driven from an electric motor 58. air under pressure to the container for forcing The motor 58 and its starter 59 is arranged 70 sand through said apertured plate into the'core above the magazine I I on a suitable platform and box, a pair of pillars disposed one at each end of also secured on top of the magazine is the sand the table, means for guiding the container on hopper or chute I2 from which the magazine is the pillars and means for clamping it thereon, a supplied with sand. pair of cylinders secured to the container and After the oil pressure chambers or “balloons” 75 capable of sliding on the pillars, each of which 2,409,880 pillars is adapted to act as a ?xed piston in one of the cylinders, an enlarged vessel containing. a supply of}, liquid arranged above each of said cylinders, each of said vessels being provided with a ?xed apertured closing plate between the 5 vessels and the top of the cylinder which serves as a dashpotto give a. smooth and slow action during ascent and descent of said cylinders, and 6 means for supplying air under pressure to each vessel above the liquid therein whereby ?uid pres sure in the cylinders above the ?xed piston faces therein is caused to raise the cylinders‘and the sand container upon the pillars. DAVID HOWARD WOOD. .HERBE'RT JAMES ROE.