| 摘要 |
In these moulds intended preferably for casting, a particular difficulty results if the protuberances of the folds are comparatively large and the moulding must be pulled out from the inner part of the mould. In order to be able to carry out this pulling out without danger, the outwardly cylindrical inner part has a plurality of rubber rings, which are pulled on with pre-tension, for demoulding these protuberances (undercuts), which rubber rings are disposed so as to be axially displaceable and are removed as the moulding is pulled off, but can then be pulled out of the moulding by deformation. The rings can be positively connected to the inner part of the mould.
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