Dispenser container with metering neck

Claim 2

A dispenser container for fluids comprising a yieldable wall with a neck defining an elongated chamber of substantially uniform cross section communicating with the interior of the container and adapted to contain a metered charge of fluid, said chamber having a dispensing outlet, a free piston within said container adapted to fit within said chamber and be movable along said chamber in response to internal fluid pressure created by deflection of said wall to discharge said metered charge through said outlet and including a hollow stem selectively adjustably slidable axially within said chamber to vary the volume of said chamber and the metered charge, one end of said stem within the chamber having a seat for said piston and the other end of said stem extending outwardly from said chamber and having a dispensing outlet.

Claim 3

A dispenser container in accordance with claim 1 wherein said seat of said valve stem has a semispherical surface and said piston has a spherical complementary surface to cooperate with said valve seat and provide a fluid seal when said piston and said surface are in engagement.

Claim 4

The dispenser of claim 1 wherein said neck has an extension which projects into the interior of said container, an end wall on the inner end of said extension to form a chamber for said piston and a vent in said end wall, said vent being dimensioned to retard piston movement through said chamber and a aperture in said extension of said neck and spaced from said vent for filling said metering chamber and out-turned flange on said neck intermediate its length and means for securing said flange to said wall.

Claim 5

A dispenser container for fluids comprising a yieldable wall with a neck defining an elongated chamber of substantially uniform cross section communicating with the interior of the container and adapted to contain a metered charge of fluid, said chamber having a dispensing outlet, a free piston within said container adapted to fit within said chamber and be movable along said chamber in response to internal fluid pressure created by deflection of said wall to discharge said metered charge through said outlet and including a hollow stem selectively adjustably positionable axially within said chamber to vary the volume of said chamber and the metered charge, one end of said stem within the chamber having a seat for said piston and the other end of said stem extending outwardly from said chamber and having a dispensing outlet, said valve seat being formed by an outwardly extending flange on said valve stem said flange having a margin engageable with the inner surface of the metering chamber to provide a seal and wherein said piston has a cylindrical surface and a flat face which cooperates with said seat to provide a fluid seal.

Claim 6

A dispenser container for fluids comprising a yieldable wall with a neck defining an elongated chamber of substantially uniform cross section communicating with the interior of the container and adapted to contain a metered charge of fluid, said chamber having a dispensing outlet, a free piston within said container adapted to fit within said chamber and be movable along said chamber in response to internal fluid pressure created by deflection of said wall to discharge said metered charge through said outlet and including a hollow stem selectively adjustably positionable axially within said chamber to vary the volume of said chamber and the metered charge, one end of said stem within the chamber having a seat for said piston and the other end of said stem extending outwardly from said chamber and having a dispensing outlet, said valve seat being formed by an outwardly extending flange on said valve stem said flange having a margin engageable with the inner surface of the metering chamber to provide a seal and wherein said piston has a cylindrical surface and a flat face which cooperates with said seat to provide a fluid seal.

Claim 7

A dispenser container in accordance with claim 4 wherein said piston has an axially extending valve member adapted to interfit in said tubular opening in said valve stem to provide a fluid seal therein.

Claim 8

A dispenser container in accordance with claim 4 wherein said piston has a concentrically and axially extending piston rod connected thereto and wherein said piston rod extends into said tubular opening in said valve stem and is of a lesser diameter than said tubular opening to provide fluid flow between said piston rod and said valve stem walls and wherein said piston rod has a circumferentially and axially extending flute intermediate its length which is defined by raised portions which engage the wall of said valve stem to provide a fluid seal between the raised portions and the valve stem walls and a fluid passage through said flute around said piston rod.

Claim 9

A dispenser container in accordance with claim 6 wherein said valve stem has an outlet at the outer end which receives the end of said piSton rod to create a fluid seal when the end of said rod is located in said outlet.

Claim 10

A dispenser container in accordance with claim 6 wherein said elongated chamber extends into said container interior, an end wall across said chamber, an inlet aperture of in said end wall said aperture being dimensioned to restrict fluid flow into said metering chamber between said end wall and said piston for retarding piston movement in said chamber to insure filling of said chamber prior to compression of said yieldable wall.

Claim 11

A dispenser container for fluids comprising a yieldable wall defining a container interior, a neck connected to said walls, said neck having a projection extending into said container interior, an inner end wall extending across said projection, a vent in said inner end wall and at least one aperture in said projection of said neck within said container interior and a major piston located in said neck and movable within said neck in response to internal fluid pressure created by deflection of said yieldable wall, said vent being dimensioned to retard movement of said piston to insure filling said neck upon inversion of said container and prior to compression of said yieldable wall, a piston rod connected to said piston, an outer end wall on said neck with an aperture which forms the container outlet which receives said piston rod, said piston rod having a diameter less than said aperture to afford fluid flow through said aperture when said rod is located in said aperture, a first minor piston on the outer end of said piston rod, said piston having a larger diameter than said piston rod, said minor piston fitting in said aperture in said outer end wall to afford a fluid seal when said minor piston is located therein.

Claim 12

A dispenser container for fluids comprising a yieldable wall defining a container interior, a neck connected to said walls, said neck having a projection extending into said container interior, an inner end wall extending across said projection, a vent in said inner end wall and at least one aperture in said projection of said neck within said container interior and a major piston located in said neck and movable within said neck in response to internal fluid pressure created by deflection of said yieldable wall, said vent being dimensioned to retard movement of said piston to insure filling said neck upon inversion of said container and prior to compression of said yieldable wall, a piston rod connected to said piston, an outer end wall on said neck with an aperture which forms the container outlet which receives said piston rod, said piston rod having a diameter less than said aperture to afford fluid flow through said aperture when said rod is located in said aperture, a first minor piston on the outer end of said piston rod, said piston having a larger diameter than said piston rod, said minor piston fitting in said aperture in said outer end wall to afford a fluid seal when said minor piston is located therein.

Claim 13

The dispenser container of claim 9, including a second minor piston, said second minor piston being located adjacent said major piston, said second minor piston being movable into said outlet to seal said outlet when said major piston has swept the fluid from said neck.

Claim 14

A dispenser container for fluids comprising a yieldable wall defining a container, an elongated wall defining a chamber extending through said yieldable wall and communicating with the interior of said container, said chamber having first and second end walls, said first end wall being located in said container interior and having an aperture of a preselected diameter to retard fluid flow, said second end wall having a fluid outlet, a fluid entry port in said chamber, said entry port being located within the container interior and spaced from said first end wall a distance greater than the length of said piston to afford fluid flow into said entry port when said piston is adjacent said first end wall, a major piston and a minor piston, said pistons interconnected in tandem by a stem, said major piston being operatively disposed within said chamber to evacuate said chamber upon compression of said yieldable wall, said minor piston cooperating with said fluid outlet in said second wall to seal said outlet initially when said container is inverted from an upright position and then open said fluid outlet as said major piston is urged downwardly through said chamber.

Claim 15

A dispenser container for fluids comprising a yieldable wall defining a container, an elongated wall defining a chamber extending through said yieldable wall and communicating with the interior of said container, said chamber having first and second end walls, said first end wall being located in said container interior and having an aperture of a preselected diameter to retard fluid flow, said second end wall having a fluid outlet, a fluid entry port in said chamber, said entry port being located within the container interior and spaced from said first end wall a distance greater than the length of said piston to afford fluid flow into said entry port when said piston is adjacent said first end wall, a major piston and a minor piston, said pistons interconnected in tandem by a stem, said major piston being operatively disposed within said chamber to evacuate said chamber upon compression of said yieldable wall, said minor piston cooperating with said fluid outlet in said second wall to seal said outlet initially when said container is inverted from an upright position and then open said fluid outlet as said major piston is urged downwardly through said chamber.