GB853757A - Foundry mould forming machine with pressure fluid actuated sand compressing means - Google Patents

Abstract

853,757. Moulding machines. TACCONE, R. W. May 7, 1959 [May 7, 1958], No. 15747/59. Class 83 (1). A sand-moulding machine comprises a thread with a recessed lower-face with a lower flexible wall, which at rest lies flat in the bottom-of the recess, means to lift a flask into sealing-engagement with said head, blowing means to fill the flask and recess with sand, and means to supply pressurefluid behind said flexible wall to compact the sand. The blowhead container 56 is supplied with a predetermined quantity of sand from a hopper 31 controlled by a gate 29, the sand being then blown under low-pressure into the flask 37. Pressure-fluid, such as gas, hydraulic liquid or tap-water is then applied behind the diaphragm 18, normally held in the cavity in the head by vacuum, as shown in Fig. 1, to force it into engagement with the sand. After compression, the pattern support 11 is lowered, the moulded-flask being received on rollers 15, 16, so that it may be moved out of the machine and an empty flask inserted. In a modification, Fig. 6 (not shown), the diaphragm is replaced by a flexible-bladder or bag 18a. There may be more than one cavity in the head housing a pressure-unit, e.g. two rectangular bladders or diaphragms, Fig. 8. Instead of the diaphragm &c. being held in the head-cavity by vacuum, the cavity may have a connection to exhaust, the diaphragm then being forced back into the cavity by the blown-sand.