Collapsible mandrel

Details Collapsible mandrel Collapsible mandrel

B - Operations, Transporting

29

C

B29C 33/00 (2006.01) B29C 33/48 (2006.01) B29C 53/82 (2006.01) B29C 65/70 (2006.01) B29C 63/34 (2006.01)

Patent

CA 2299487

A novel construction of collapsible mandrel is described, the outer wall of which comprises a plurality of sections with mating edge surfaces that diverge inwardly on odd-numbered sections and convergently on the alternating even-numbered sections of the mandrel wall, so that the odd-numbered set of sections may be retracted by a predetermined first amount than the even-numbered wall sections by a predetermined, lesser second amount. The collapsible mandrel is useful in a number of applications, such as the production of filament wound containers. In a particular embodiment of the invention, the retractible sections make up the walls of a vertically-oriented cylindrical retractible mandrel which may be used for fabricating large-diameter chimney liners of fibre-reinforced plastic.

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