Patent ID: 6360922
Filing Date: 2002-03-26
Classification: B05B,G01F

Abstract:
A pump attachment for a container defining a neck, comprising:a body that defines an elongate chamber having a first end, a second end, and an interior wall that extends between said first end and said second end; a coupler sized and shaped to secure said body to a neck of a container; a shaft that extends through an opening in said first end of said chamber, said shaft defining an internal flow channel and being moveable within said body between a first position and a second position; a piston reciprocally mounted within said chamber, said piston defining an outer annular surface sized and shaped to form a sealing engagement with said interior wall of said body, said piston further defining an inner annular surface in which said shaft is mounted such that said shaft can move independent of said piston between said first and second positions, said inner annular surface further including a sealing surface to restrict the flow of fluid between said inner annular surface and said shaft, said piston separating said chamber into an upper portion above said piston and a lower potion below said piston; a biasing member that is located between said piston and said first end of said chamber; a first valve at said second end of said body, said first valve configured to permit the flow of fluid into said chamber and restrict the flow of fluid out of said chamber; and a second valve at said second end of said body, said second valve being moveable between an open position configured to permit the flow of fluid out of said chamber and a closed position configured to restrict the flow of fluid out of said chamber, said second valve further configured to be biased to said closed position, said attachment configured such that when said shaft is moved to said first position a lateral wall of said shaft moves said second valve laterally from said closed position to said open position.