Low residual inverted pumps, dispensers and refill units
First Claim
Patent Images
1. A pull pump comprising:
- a housing;
a piston that reciprocates within the housing;
the piston having an outer wall and at least a portion of the center of the piston is hollow;
the piston includes an orifice form the outer wall to the center of the piston;
a first seal is located proximate the upper end of the piston to provide a seal between the piston and the housing;
the first seal is located above the orifice in the piston wall;
a liquid inlet in the side wall of the housing at a point lower than the top of the piston;
a one-way liquid inlet valve;
a liquid outlet having a one-way liquid outlet valve;
a charge chamber defined at least in part by the one-way liquid inlet valve, the one-way liquid outlet valve, a wall of the housing and a wall of the piston; and
a mixing chamber located downstream of the one-way liquid outlet valve;
wherein the charge chamber is dispensed by pulling the piston downward and recharged by moving the piston upward.
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Accused Products
Abstract
A foam pump including a housing and a piston that reciprocates within the housing is disclosed herein. The piston has a hollow portion and an orifice through the wall of the piston. A first seal located proximate the upper end of the piston provides a seal between the piston and the housing. A liquid inlet is located in the side wall of the housing at a point lower than the top of the piston. A one-way liquid inlet valve is located proximate the liquid inlet and a one-way liquid outlet valve is located prior to the liquid outlet. A charge chamber is defined at least in part by the liquid inlet valve, the liquid outlet valve, a wall of the piston and a wall of the housing.
35 Citations
23 Claims
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1. A pull pump comprising:
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a housing; a piston that reciprocates within the housing; the piston having an outer wall and at least a portion of the center of the piston is hollow; the piston includes an orifice form the outer wall to the center of the piston; a first seal is located proximate the upper end of the piston to provide a seal between the piston and the housing; the first seal is located above the orifice in the piston wall; a liquid inlet in the side wall of the housing at a point lower than the top of the piston; a one-way liquid inlet valve; a liquid outlet having a one-way liquid outlet valve; a charge chamber defined at least in part by the one-way liquid inlet valve, the one-way liquid outlet valve, a wall of the housing and a wall of the piston; and a mixing chamber located downstream of the one-way liquid outlet valve; wherein the charge chamber is dispensed by pulling the piston downward and recharged by moving the piston upward. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A refill unit for a dispenser comprising:
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a container for holding a liquid; a neck formed in the container; a pump housing located at least partially within the neck; a piston having a sealing member; wherein the sealing member contacts a wall of the pump housing; a fluid pathway between the neck of the container and the pump housing; a fluid inlet through the sidewall of the pump housing located below the top of the neck of the container; a one-way fluid inlet valve located proximate the fluid inlet; a fluid outlet including a one-way fluid outlet valve; a charge chamber defined at least in part by the one-way fluid inlet valve, the one-way fluid outlet valve, the pump housing and the piston; an air inlet; a one-way air inlet valve; a mixing chamber located downstream of the charge chamber and the one-way air inlet valve; an air inlet and a fluid inlet for allowing air and liquid into the mixing chamber; and wherein movement of the piston in an upward direction causes fluid to flow into the charge chamber; and
movement of the piston in the downward direction causes fluid to be expelled from the charge chamber. - View Dependent Claims (17, 18, 19, 20)
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21. A foam pump refill unit comprising:
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a container having a neck; the neck further having an inside diameter; the inside diameter of the neck having a smaller cross-sectional area than the cross-sectional area of the container; a pump housing having an outside diameter; the outside diameter of the pump housing having a diameter that is smaller than the inside diameter of the neck to create a fluid flow path therebetween; a piston having a piston seal for engaging an inside wall of the pump housing; a fluid inlet located in the sidewall of the pump housing to draw in fluid from the fluid flow path; a one-way fluid inlet valve; a one-way fluid outlet valve; a charge chamber defined at least in part by the fluid inlet valve, the one-way fluid outlet valve;
the pump housing and a wall of the piston;an opening in the wall of the piston to allow fluid to flow from outside of the piston to the interior of the piston; a mixing chamber; an air inlet; a one-way air inlet valve located proximate the air inlet; the mixing chamber is located downstream of and in fluid communication with the air inlet and the fluid charge chamber; wherein movement of the piston in an upward direction causes fluid to flow into the charge chamber; and
movement of the piston in the downward direction causes fluid to be expelled from the charge chamber. - View Dependent Claims (22, 23)
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Specification