Collapsible core for concrete pipe making apparatus

B - Operations – Transporting – 28 – B

Patent

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Details

B28B 21/88 (2006.01) B28B 19/00 (2006.01)

Patent

CA 2197630

A collapsible core for concrete pipe making machines that are used in the dry cast process when lined pipe are to be produced. The collapsible core of the invention has a moveable front panel joined to two moveable side panels, all of the panels being connected to hydraulically powered linkage arrangements that will pull the panels straight back from the liner. The collapsible core is constructed so that when moveable panels of the core are retracted to collapse the core, the core panels are guided along radial lines of the core to pull the panels directly away from the pipe liner, thus practically eliminating the friction that causes bulging or pull out of the liner from the concrete pipe.

Noyau rétractable pour machines à fabriquer des tuyaux de béton utilisées dans le procédé de moulage à sec lors de la production de tuyaux à revêtement intérieur. Le noyau rétractable de la présente invention possède un panneau avant mobile réuni à deux panneaux mobiles latéraux; tous les panneaux sont reliés à un ensemble de mécanismes hydrauliques qui détachent les panneaux directement du revêtement. Le noyau rétractable est fabriqué de sorte que, lorsque les panneaux mobiles sont rentrés pour le replier, ils sont guidés par des lignes radiales se trouvant sur le noyau même afin de détacher directement les panneaux du revêtement du tuyau, éliminant à toutes fins utiles la friction à l'origine du gonflement ou de l'arrachement du revêtement du tuyau de béton.

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