Patent ID: 7393495
Filing Date: 2008-07-01
Classification: B29C,B29L

Abstract:
1. An apparatus for creating a blow-molded object with a protuberance, comprising: a mold having a molding surface against which blow-molding material is blown, the molding surface having a cavity therein, the cavity receiving at least some of the blow-molding material and having a first end and a second end; a piston disposed within the cavity and toward the second end of the cavity in a retracted position and moveable toward the first end of the cavity in an extended position; wherein, when during molding said piston is in the retracted position, at least some of the blow-molding material is urged from the first end of the cavity toward the second end of the cavity, and when said piston is moved to the extended position, at least some of the blow-molding material is urged back toward the first end of the cavity; and wherein, when said piston is moved to the extended position, excess material is urged into a void between walls of the blow-molded object.