Improvements in or relating to Apparatus for use in Making Reversible Pattern Plates

13,676. Bonvillain, P. June 16. Moulding.-In making reversible pattern plates, a sand mould is made with a pattern in a moulding-box consisting of two parts a, b, superposed and closed at one end by plates. Each has two halfholes d, a hole e, and holes f, the latter being used in unmoulding deep patterns. The part b is lifted off and placed beside the part a, and, on removing the plates over the holes d, a cast-iron frame s fixed on them by pins in the holes d, e. The pattern plate is made by running plaster into the iron frame. For smaller pattern plates, frames l are fixed on the original frame. For casting articles, the pattern plate may be smaller than the moulding-box.