Patent ID: 8919614
Filing Date: 2014-12-30
Classification: B05B,B65D,G01F

Abstract:
1. A dispenser comprising: a housing; a variable-volume storage chamber formed within the housing and defining a substantially fluid-tight seal between the chamber and exterior of the housing for storing a substance to be dispensed; a piston mounted on the dispenser movable between rest and second positions; a compression chamber connectible in fluid communication with the variable volume storage chamber; a one-way valve mounted on the dispenser connectible in fluid communication with the compression chamber, the one-way valve including a valve seat and a valve member, having a closed condition in which the valve member engages the valve seat, defining a normally-closed outlet, and an open condition in which at a least portion of the valve member is moved away from the valve seat to allow the passage of substance through the outlet and out of the dispenser; wherein (i) during movement of the piston in a direction from the second position toward the rest position, the variable-volume storage chamber is in fluid communication with the compression chamber for permitting the substance to flow from the variable-volume storage chamber into the compression chamber, reducing the volume of the variable-volume storage chamber by an amount approximately equal to the amount of substance that flows into the compression chamber, and (ii) during movement of the piston in a direction from the rest position toward the second position, the substance is pressurized above a valve opening pressure of the one-way valve, thereby moving the at least a portion of the valve member away from the valve seat from the closed condition to the open condition, and dispensing substance through the one-way valve and out of the dispenser.