Mold form and use thereof

Mould for moulding hollow products or products with recesses and made from a material which quickly expands after removal from the mould, comprising a pair of mould parts and a one-piece core surrounded thereby, whereby the mould parts and the core define a mould cavity provided with filling channels for injection of the moulding material, the core having an extension for engaging both mould parts, the extension being movably mounted on a guide column for movement out of the respective mould part when the mould is opened, and a compression spring being positioned in one of the mould parts and supported on the other mould part and the core, wherein the guide column is rigidly connected with one of the mould parts and extends through a through-passage in the extension and into a bore in the other mould part and the compression spring is positioned coaxially to the guide column.

Mould for moulding hollow products or products with recesses and made from a material which quickly expands after removal from the mould, comprising a pair of mould parts and a one-piece core surrounded thereby, whereby the mould parts and the core define a mould cavity provided with filling channels for injection of the moulding material, the core having an extension for engaging both mould parts, the extension being movably mounted on a guide column for movement out of the respective mould part when the mould is opened, and a compression spring being positioned in one of the mould parts and supported on the other mould part and the core, wherein the core has protruding cams which bridge the mould cavity in between the two mould parts and the core.

Mould for moulding hollow products or products with recesses and made from a material which quickly expands after removal from the mould, comprising a first mould part, a second mold part, and a one-piece core surrounded thereby, whereby the first mould part, the second mold part, and the core define a mould cavity provided with filling channels for injection of the moulding material, the core having an extension for engaging both the first mould part and the second mold part, the extension being movably mounted on a guide column for movement out of a respective one of the first mould part and of the second mold part when the mould is opened, and a compression spring being positioned in the first mould part and supported on the second mould part and the core.

Mould for moulding hollow products or products with recesses and made from a material which quickly expands after removal from the mould, comprising a pair of mould parts and a one-piece core surrounded thereby, whereby the mould parts and the core define a mould cavity provided with filling channels for injection of the moulding material, the core having an extension for engaging both mould parts, the extension being movably mounted on a guide column for movement out of the respective mould part when the mould is opened, and a compression spring being positioned coaxially to the guide column in one of the mould parts and supported on the core.