Apparatus for manufacturing bell and spigot pipe moldings

Details Apparatus for manufacturing bell and spigot pipe moldings Apparatus for manufacturing bell and spigot pipe moldings

1998-05-06

1999-12-21

Pyon, Harold

Plastic article or earthenware shaping or treating: apparatus

Means to create a vacuum or apply fluid pressure within a...

Isostatic type

425812, 425DIG44, A01J 2100, A01J 2512

Patent

active

060041269

ABSTRACT:
Particularly large-size bell and spigot pipes of ceramic molding material are isostatically pressed within a hollow-cylindrical pressure pot with a molding cavity for the molding compound. An inner core is axially extractable and an elastomeric diaphragm is disposed concentrically around the inner core. The diaphragm is clamped in place at its end face and there is defined between the pressure pot and the diaphragm a chamber which communicates with a source of hydraulic pressure. The inner core is provided with a molding ring on which the bell region of the bell and spigot pipe is formed. The molding ring has a reduced-diameter end region and thus defines two end faces. The two end faces are concentric but axially spaced apart. At least the upper end face of the molding ring is provided with a surface coating of elastic plastic material. An annular gap is defined between the end region of the molding ring and the inner core which, depending on the hydraulic pressure in the cavity, opens and closes a vent port which communicates with the molding cavity. Microcracks in the bell region of the molding can be safely avoided.

REFERENCES:
patent: 2865079 (1958-12-01), Marchioli et al.
patent: 3193900 (1965-07-01), Wendt
patent: 3239591 (1966-03-01), Wendt
patent: 3561079 (1971-02-01), Anderson
patent: 3907949 (1975-09-01), Carlson
patent: 4888144 (1989-12-01), Matsushita et al.
patent: 4937025 (1990-06-01), Foster et al.

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