METERING DISPENSING SYSTEM WITH IMPROVED VALVING TO PREVENT ACCIDENTAL DISPENSING OF LIQUID THEREFROM
First Claim
1. A dispensing device, comprising:
- a base plate, having an upstream side and a downstream side, and defining a liquid flow aperture therethrough;
a flap of material removably positionable over the liquid flow aperture and in sealing engagement with the downstream side of the base plate;
a flexible pump housing, having an inner cavity and a flap contact surface on an inner wall, sealed to the downstream side of the base plate and positioned about the flap of material;
the flexible pump housing and base plate further defining an exit port;
the flexible pump housing being configured to draw liquid from the upstream side of the base plate, through the liquid flow aperture and into the inner flow cavity;
the flexible pump housing being further configured to urge liquid through the exit port when the flap contact surface of the flexible pump housing has pressed the flap of material against the downstream side of the base plate to seal the liquid flow aperture to prevent flow of liquid therethrough.
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Accused Products
Abstract
A liquid dispensing device includes a storage container and dome pump mechanism attached thereto for metered dispensing. A one-way valve is employed to pull liquid from the storage container into the dome for metering. An exit passageway serves as an output valve. Each time the dome pump housing is depressed, a substantially equal volume of fluid is dispensed from the container. To prevent accidental dispensing, the one-way valve in the dome pump remains normally open and unsealed to allow backflow of liquid back into the storage container pouch when pressure is placed on the dome. The user squeezes the dome and base plate together to seal the one-way valve to urge liquid out through the exit port for actual dispensing. Also, interior pouch force creates blackflow through the exit port back into the containment chamber to further prevent leakage.
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Citations
19 Claims
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1. A dispensing device, comprising:
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a base plate, having an upstream side and a downstream side, and defining a liquid flow aperture therethrough; a flap of material removably positionable over the liquid flow aperture and in sealing engagement with the downstream side of the base plate; a flexible pump housing, having an inner cavity and a flap contact surface on an inner wall, sealed to the downstream side of the base plate and positioned about the flap of material;
the flexible pump housing and base plate further defining an exit port;the flexible pump housing being configured to draw liquid from the upstream side of the base plate, through the liquid flow aperture and into the inner flow cavity; the flexible pump housing being further configured to urge liquid through the exit port when the flap contact surface of the flexible pump housing has pressed the flap of material against the downstream side of the base plate to seal the liquid flow aperture to prevent flow of liquid therethrough. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of pumping liquid, comprising the steps of:
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providing a base plate, having an upstream side and a downstream side, and defining a liquid flow aperture therethrough; removably positioning and sealing a flap of material over the liquid flow aperture with the downstream side of the base plate; sealingly connecting a flexible pump housing, having an inner cavity and a flap contact surface on an inner wall, to the downstream side of the base plate and about the flap of material; providing an exit port between the flexible pump housing and the base plate; drawing liquid from the upstream side of the base plate, through the liquid flow aperture and into the inner cavity; sealing the liquid flow aperture by depressing the flexible pump housing to move the flap contact surface to press the flap of material against the downstream side of the base plate; and urging flow of liquid through the exit port by further pressing the flexible pump housing. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for dispensing liquid, comprising the steps of:
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providing a pump having an input port, an output port, a chamber, a first region and a second region; drawing liquid into the chamber via the input port; exerting pressure on the first region of pump to seal off the input port; exerting pressure on the second region of the pump to urge liquid from the chamber and through the output port.
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14. A dispensing device, comprising:
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a container maintaining a material to be dispensed; a dome pump received by said container, said dome pump having an inlet in communication with an interior of said container, and an outlet in communication with an exterior of said container; a first valve interposed between said inlet and said interior of said container; and wherein activating forces applied concurrently to opposite sides of said dome pump activate said first valve to cause passage of material from said dome pump and through said outlet, and activating forces applied to only one side of said dome pump activate said first valve to cause passage of material from said dome pump into said container through said inlet. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification