| 摘要 |
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.
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