| 摘要 |
A method and apparatus for pressure forming plastic pipe bells utilizing external air pressure is disclosed. The apparatus includes a horizontally oriented, shaped mandrel, which may or may not have expanding segments for forming an internal groove in the pipe bell, mounted within a pressure chamber. A natural rubber circular gasket is positioned at the front end of the pressure chamber and the end of the pipe is pushed through the rubber gasket and over the mandrel. A pair of cooperating upper and lower front plates are oppositely vertically reciprocal relative to the bell end of the pipe and act to retain the gasket when pressure is built up within the pressure chamber. Suitable air and water spray inlet and outlet connections are provided.
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