(57) The patent concerned relates to a mould for casting sanitary appliances with an open
or closed integral rim, comprising a lower mould piece and at least two lateral mould
pieces arranged to close together on this latter with a horizontal mutual approach
movement, and further comprising, at the upper ends of the inner surfaces of the two
lateral mould pieces, coplanar perimetral ledges which project towards the central
zone of the mould such that the upper horizontal wall of the open or closed integral
rim of the article to be cast becomes formed on their lower faces during the casting
stages; the aperture defined by said coplanar perimetral ledges being closed by a
suitable plug, of which that portion inserted into the aperture constitutes the forming
surface for the inner vertical wall of the open or closed rim.
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