Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Including shaping means comprising fluid pressure contacting...
Patent
1974-08-16
1976-08-17
Husar, Francis S.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Including shaping means comprising fluid pressure contacting...
425392, 425397, B29D 2303, B29C 1704
Patent
active
039751295
ABSTRACT:
Apparatus for making flexible corrugated tubing of relatively large diameter and wall thickness from an extruded sleeve of uncured vulcanizable stock. The sleeve is placed on a cylindrical forming mandrel and radially expanded into an axially extensible and compressible forming member having interior edges that define successive convolutions coaxial with the mandrel and which form creases in the sleeve when it is radially expanded. The mandrel is supported at its opposite ends by two spaced forming head assemblies that surround the ends of the sleeve and which also engage the opposite ends of the forming member. When the sleeve is radially expanded to form bulges between the interior edges, the forming head assemblies are simultaneously moved in an axial direction toward one another by power means to compress the forming member and sleeve and thus, to produce embryonic corrugations in the sleeve. After the forming head assemblies are moved apart to their initial position, the forming member is removed from the mandrel and sleeve and the resulting product is cured in the desired corrugated form.
REFERENCES:
patent: 1963013 (1934-06-01), Breth
patent: 2306018 (1942-12-01), Fentress
patent: 3076228 (1963-02-01), Johnson
patent: 3304581 (1967-02-01), Kramer et al.
patent: 3371381 (1968-03-01), Louth
patent: 3669586 (1972-06-01), Kramer
patent: 3672804 (1972-06-01), Dalik
patent: 3705780 (1972-12-01), Kramer et al.
Husar Francis S.
Rowold Carl
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