B - Operations – Transporting – 22 – C
Patent
B - Operations, Transporting
22
C
22/139
B22C 9/22 (2006.01) B22D 15/04 (2006.01) B22D 25/02 (2006.01) B29C 45/26 (2006.01)
Patent
CA 1217917
A B S T R A C T A method of casting or moulding an article having an internally screw-threaded hole comprises introducing casting or moulding material into a mould cavity around a core pin formed with segments of a screw thread separated by flutes and also around withdrawable flat core members projecting into the mould cavity with their leading ends fitting snugly into the flutes. The segments of screw thread form the male image of segments of the required female thread. When the casting or moulding material has set first the core members are withdrawn from the mould cavity then the core pin is rotated to bring the screw-threaded segments into the positions formerly occupied by the flutas and the pin is with- drawn axially from the mould cavity. Finally the article is removed from the mould cavity.
461028
Dynacast International Limited
Fetherstonhaugh & Co.
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