Pressure fillable dispensing device

Claim 1

A dispensing device for a pressurized liquid container capable of delivering metered quantities of an aerosol composition and having a discharge tube through which the container can be filled with fluids under pressure comprising: a. a generally cylindrical chamber including an upper chamber and a lower chamber, said generally cylindrical chamber being adapted to be sealed into a neck of said container, said upper chamber being closed at the upper end with respect to said container by a seal means; b. discharge tube means mounted in said seal means and extending therethrough into said generally cylindrical chamber, said discharge tube being resiliently biased toward the upper end of said upper chamber and being movable axially in said generally cylindrical chamber, said discharge tube having a skirt at the lower end thereof which extends outwardly to the inner walls of said upper chamber to assist at maintaining said discharge tube in the center of said upper chamber and which strikes said seal means to limit the upward movement of said discharge tube; and, c. a cup-shaped piston member connected to said discharge tube with its open end towards the lower end of said lower chamber, said cup-shaped piston member having a laterally resilient rim with the entire periphery thereof sliding directly against the side wall of said lower chamber when said discharge tube is depressed a predetermined amount to isolate a metered quantity of fluid within said upper chamber, said rim of said cup-shaped piston member being sufficiently resilient to allow fluids introduced under pressure through said discharge tube during filling of said container to flow between said rim and said side wall of said lower chamber, said lower chamber having a plurality of ribs connected to said side wall of said lower chamber for mechanically deflecting said rim inwardly.