Patent ID: 6419129
Filing Date: 2002-07-16
Classification: B29C,B29K,B65D

Abstract:
A dispenser for the pressurized dispensing of product, comprising:a container having a bottom, a side wall, a top, an opening in said top for mounting an externally actuable valve means, and a closable opening in said bottom for introducing propellant into said container; an externally actuable valve means extending through said top opening for dispensing product from within said container; a unitary flexible barrier sealed between the sidewall and top of said container for defining a first zone above said barrier for holding the product in fluid communication with said valve means and a second zone below said barrier for holding a propellant out of fluid communication with said first zone; said barrier being a shaped spatial form having a terminal sealing means, a flexible wall portion, and a central piston region, said sealing means, wall portion and piston region being formed as a unitary spatial form with sufficient rigidity to maintain its shape prior to and during insertion into said container; said flexible wall portion having an inner wall segment and an outer wall segment connected by a fold; said outer wall segment being a steeply frustoconical shape and extending from the terminal sealing means to the fold, said outer wall segment and fold being dimensioned upon insertion into a container to form an initial spaced relationship with the inner side container surface; said inner wall segment being an oppositely-directed, steeply frustoconical, shape contained within the outer wall segment and extending upwardly from the fold; said central piston region being connected to and extending across the area defined by the circumference of the inner wall segment to close and complete the unitary barrier member; said inner wall segment having sufficient flexibility to permit said inner wall segment and said central piston region to move in an axial direction within the container.