Dispenser adapted for fast pressure filling

Claim 1

In a pressurized dispenser comprising: a container; a mounting cup having a central opening therein, said mounting cup attached to said container; a dispensing means comprising a body member forming a tank and having an open top portion and a dispensing stem projecting therefrom through said central opening in said mounting cup and spaced from said opening to form a gap, said body retained in said mounting cup; and a diaphragm interposed between said body and said mounting cup, sealing around said projecting stem, the improvement comprising: (a) a body member forming a chamber axially inward of said tank, said chamber having a diameter smaller than the diameter of said tank, said tank thereby having a bottom at the point where said chamber begins, at least one hole formed in said bottom radially outward of said chamber thereby forming a path to the inside of the container; (b) a piston-like member inserted into said tank extending to the bottom thereof, said piston-like member having a flange extending axially inward terminating in a sealing lip sealing against the side of said tank at said bottom, said flange being radially flexible at said sealing lip, and an annular portion radially inward of said sealing lip forming a throat, said dispensing stem extending through said throat; and (c) a cylindrical member concentric with said flange sealed to and extending axially inwardly from said throat and engaging said chamber in a sealing manner so as to seal off an annular space between said flange and said cylindrical member, which space is in communication with said at least one hole, whereby during pressure filling, a gas admitted through the opening in said mounting cup and around said stem will flex said diaphragm, flow into said tank, and flex said flange radially inwardly to move said sealing edge from the side of said tank permitting flow through said at least one hole into the inside of the container.