| 摘要 |
For the manufacture of a mould such as a sand mould for casting metal products use is made of a primary pattern member a surface of which is used to create a first part of a required mould shape, and a secondary pattern member carried by and movable relative to said primary pattern member, said secondary pattern member having a surface which is used to create another part of a required mould shape, said primary pattern member being of a shape removable from a mould in a first direction without damage to the mould, said secondary pattern member being movable in unison with the primary pattern member in said first direction (B) and being selectively movable relative to the primary pattern member in a second direction which is inclined relative to said first direction, the secondary pattern member being movable to an extended position for an operation of creating a required mould shape and movable to a retracted position after a required mould shape has been created and prior to removal of the primary pattern member from a mould. The secondary pattern member may be moved to an extended position either before or after mould material has been shaped by said surface of the primary pattern member and thereby enables a surface of the secondary pattern member to create another part of a required mould shape, before the secondary pattern member is moved to a retracted position. |
