Importance

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Abstract

A pressurized dispenser which includes a container, a mounting cup with a central opening attached thereto, a dispenser having a body member forming a tank and an open top portion, a dispensing stem projecting through the central opening, the body retained in the mounting cup, and a diaphragm interposed between the body and the mounting cup sealing around the projecting stem. The body member forms a chamber having a diameter smaller than the diameter of the tank axially inward of the tank, to form a bottom in the tank at the point where the chamber begins. At least one hole is formed in the bottom radially outward of the chamber forming a path to the inside of the container. A piston-like member inserted into the tank extending to its bottom has a flange extending axially inward terminting in a sealingly lip sealing against the side of the tank at the bottom and an annular portion axially inward of the sealing edge forming a throat, with the valve stem extending through the throat. A cylindrical member concentric with the flange is sealed to and extends inwardly from the throat and engages the inner chamber in a sealing manner so as to seal off the annular space between the flange and the cylindrical member, this space being in communication with the hole permitting, during pressure filling, the flexing of the sealing lip away from the side of chamber to permit flow through the hole into the container.

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First Claim