Patent ID: 7980425
Filing Date: 2011-07-19
Classification: B67D,F04B,Y10T

Abstract:
1. A pump for metering a liquid from a container, comprising: a flexible tube extending between a first and a second tube end with said first tube end connected to the container; a pressure relief valve located in said flexible tube; a pump housing having a pump housing aperture for receiving said flexible tube; a compression surface located adjacent to said pump housing aperture; a reciprocating member having a pumping element with a void defined in said pumping element; a sealing element slidably located in said void; a spring mounted on said pumping element for interacting between said pumping element and said sealing member for urging said sealing element to extend beyond said pumping element; a drive moving said sealing element for pinching said flexible tube against said compression surface through a compression of said spring upstream from said pressure relief valve for trapping liquid between said sealing element and said pressure relief valve; and said drive moving said pumping element for collapsing said flexible tube against said compression surface for pumping said trapped liquid to discharge a metered quantity of the liquid from said pressure relief valve.