Mold for airspring rubber membrane

Details Mold for airspring rubber membrane Mold for airspring rubber membrane

1987-03-13

1988-06-07

Hart, Charles

Plastic article or earthenware shaping or treating: apparatus

Reshaping, resizing or vulcanizing means for tire, tire...

Toroidal or annular female shaping means and coacting means...

264501, 249122, 425429, 425535, B29C 4920

Patent

active

047493453

ABSTRACT:
A method of manufacturing a beadless flexible member for an airspring having a fully molded non-tubular shape. An axially segmented mold with tapered circular end bores is used with conically tapered end plugs which sealingly compress an uncured preform of the flexible member between the conical plugs and the tapered circular end bores. Compressed fluid is injected into the interior of the preform to radially expand it to the desired molded shape. At a rate determined by the radial expansion of the preform, the annular segments of the mold are axially moved together to accommodate the axial foreshortening of the preform during its radial expansion. After full axial closure of the mold, heat and pressure are applied to vulcanize the preform. The beadless, fully molded flexible member may be used for airsprings requiring zero pressure roll capability. Preferred forms of the flexible member have tapered wall thickness in the neck with circumferential indexing ribs for exact placement of compression rings on the finished airspring.

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patent: 4587074 (1986-05-01), De Loof
patent: 4666650 (1987-05-01), Canow

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