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Controlling the Diameter ff Openings Through Molded Plastic Members

IP.com Disclosure Number: IPCOM000050225D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10

Publishing Venue


Related People

Olson, ST Rachui, RA [+details]


The present process provides a new approach to controlling the diameter of openings through molded plastic members and particularly hub-like molded plastic members. In the molded plastic art when it is required to have an inside diameter (I.D.) of varying dimensions such as a tapered or stepped I.D., several complex and expensive steps are required. The present approach involves the recognition that upon the cooling of a molded member having a core pin passing therethrough, the thickness of the walls surrounding the core pin has a direct effect upon the dimensions of the I.D. In other words, the hot member may be removed from the mold with a perfectly symmetrical I.D. However, upon cooling, the I.D. will assume varying dimensions along its length dependent upon variations in wall thickness.