Belling assembly and method of forming a bell end

Details Belling assembly and method of forming a bell end Belling assembly and method of forming a bell end

1974-10-03

1976-06-01

Husak, Francis S.

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Rod or tubular preform

425403, 425DIG218, 264318, 264334, B29C 1700

Patent

active

039604721

ABSTRACT:
A method and assembly for forming the bell end of a bell and spigot joint connecting two pipes together are disclosed herein. The method, which also includes the formation of an inner circumferential groove in the bell end, utilizes a core section in forming the bell end and an adjacent groove forming arrangement in forming the inner circumferential groove. The groove forming arrangement comprises a plurality of core segments which cooperatively move in a plane perpendicular to the longitudinal axis of the bell forming core section between an expanded position to form the groove and a collapsed position for removing the ultimately formed bell end from the core and core segments. With the core segments in the collapsed or expanded position, an end section of a heat deformable pipe, heated to its deformable state, is contoured around the core section and core segments. Thereafter, the core segments, if initially collapsed, are moved to the expanded position. By this procedure a bell end including an inner circumferential groove is formed. After the pipe section has cooled, the core segments are moved to the collapsed position and the bell end separated from core section and segments.

REFERENCES:
patent: 639508 (1899-12-01), Bonta
patent: 3205535 (1965-08-01), Niessner et al.
patent: 3484900 (1965-12-01), Sands et al.
patent: 3852016 (1974-12-01), Delauzun

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