Patent ID: 7270169
Filing Date: 2007-09-18
Classification: B22C,B22D

Abstract:
1. A mould-making apparatus for a mould-string foundry plant, said apparatus comprising a pressure chamber for producing mould parts by compressing sand or similar mould material, said chamber comprising movable pattern plates for forming impressions in the surfaces of the mould parts, whereby mould cavities are provided at the interface between the mould parts, when these are positioned in close proximity, a pouring track or guideway to receive the produced mould parts and stepwise advancing the string of moulds, a pouring station, in which the mould cavities are filled with molten metal, said pattern plates comprising runner pattern elements for forming a runner connection between inlet runners for consecutive mould cavities, characterized by further comprising means selectively retracting or otherwise moving at least one of the pattern elements for forming the runner connection, whereby no connection is formed when this pattern element is retracted or moved from its normal position.