GB545042A - Improvements in and connected with the making of metal-casting moulds - Google Patents

Abstract

545,042. Moulds, flasks and patterns. CASTINGS PATENT CORPORATION, and HAGEMEYER, H. F. June 5, 1940, No. 1399/42. Divided out of 545,006. [Class 83 (i)] To facilitate the production of different numbers of different castings from moulds casting a number of articles at once, a mould box is used which comprises a base plate 1, to which is secured a centre plate 11 with a runner pattern 15, and a number of pattern plates 10 detachably mounted on the plate 1 to abut the plate 11. Some of the pattern plates 10<SP>1</SP> may be two or more times the width of the basic plates 10 for moulding larger articles and any of the plates may be removed, when a sufficient number of the articles concerned have been moulded, by unscrewing bolts 14 without removing the rim 2 of the box. The plate 15 is formed at 16, 18 to produce, in addition to the runner 151, Fig. 8, a sprue 161, or sump 17<SP>1</SP> and a dowel 19<SP>1</SP>, or a socket 181. The plates 10, 10<SP>1</SP> may be.recessed all around the projecting patterns P to produce a ridge 3, Fig. 9, or 21, of the mould material which may have a gypsum base. This ridge, when the mould halves are assembled, will crush to form a compact joint 31, Fig. 10, which will avoid the formation of a fin on the casting. To avoid lateral movement in assembling the mould halves these are provided with ribs 41, 40, Fig. 8, produced by corresponding formations 20, 22, Fig. 2, in the rim 2, means not shown being used to keep the sides of the ribs 40 on the cope and drag in alignment. Specification 545,006 is referred to.