Patent GB-393055-A (GB)
Title: Improvements relating to foundry moulding methods and apparatus
IPC: B22C11/00
Filed: 1932-04-09
Abstract: 393,055. Moulding-machines. WILSON, P. H., 21, Trevose Gardens, Sherwood, Nottingham, RIDLEY, W., 18, Cromwell Road, Beeston, Nottinghamshire, and STANTON IRONWORKS CO., Ltd., Stanton-by-Dale, Derbyshire. April 9, 1932, No. 10236. [Class 83 (i).] Cores; core-boxes.-In a turret moulding- machine the separation of the moulding-device parts and the ejection of the moulded product is effected while the parts are in operative relation to the press which compacts the moulding material. The machine may have four or more tables c1 each with plungers c2 which are grooved to avoid obstruction by sand and can slide vertically in the turret a. This is intermittently rotated by a pneumatic cylinder d, rope d1, and ratchet drum d3 and locked by a projection f, Fig. 3, engaging between a non-return spring pawl and a stop f2, which is raised by a counterweight d4, on the rope d1, engaging a lever f6. At the position I core reinforcements are placed in a lower core-box, secured to a table, with parts e1, Fig. 11, protruding so that they can be engaged by ejecting bolts i4. At position II, Fig. 1, the box and an applied gauge or false box are charged by means of a sand slinger l, Fig. 3, and the gauge is removed. At position III it comes below a corresponding upper corebox, fixed to a table g5 which is carried, with two or more others, by a head g1, Fig. 2, capable of rotation by cylinders and chain gearing g9 and is raised by an hydraulic plunger e1 to compress the sand, the top end of the plunger e1 having a cone to engage a corresponding recess in the plunger c2. At the same position the claw-ends h1, h2 of a link engage heads h6, h8 of rods h7, e4 connected respectively to the head g1 and to a piston which is operated at the same time as the plunger e1 but in the opposite direction. During the return of the plunger e1, detents k1, Figs. 3 and 11, arrest a spring-mounted plate i on which the bolts i4 are mounted and thus eject the core. In position IV the core is trimmed and removed and the detents k1 withdrawn by raising a handle k4 to allow the bolts i4 to fall. A brake a2, loaded by a weight, checks a too free movement of the turret. Spilled sand is directed by shoots m1 on to a travelling band m. The core-boxes, carried by the tables c1, need not be identical, provided a corresponding top-box is moved into the correct position at III. If the machine is used to make moulds, the tables c1 carry pattern-plates and a plane plate is secured to the table g5 in use. At position I a flask is positioned, at II charged, at III pressed and drawn by the bolts i4, and at IV removed. The machine may be used with core-boxes each having two symmetrically arranged core spaces d<1>, Figs. 12 and 14, lined with white metal and surrounded by narrow surfaces c<1>, which are separated by a few thousandths of an inch when the halves are assembled and dowels b<1> engage sleeves b<51>. Large clearances c<11> are provided elsewhere. Reinforcing bars e<1> with fins e<21> and perforated vent tubes or angleirons e<31> are arranged in the lower box and supported by bars e<71> positioned by dowels b<21>. The gauge comprises a plate f<1>, Fig. 17, of wood, aluminium, or other light material with hard metal reinforcers f<21>. Eyes e<81>, Fig. 12, may be used for removing the cores.