Patent ID: 6695176
Filing Date: 2004-02-24
Classification: B05B

Abstract:
A manual pump dispenser, comprising, a pump body having a pump piston reciprocable between pressure and return strokes in a pump cylinder against the bias of a piston return spring to define with said cylinder a variable volume pump chamber, said pump body having an inlet valve for the inletting of a liquid product to said chamber upon the piston return strokes, a discharge valve snap-fitted to the pump body for the outletting of the liquid product from the chamber upon the piston pressure strokes through a discharge passage of a plunger head mounted to the piston, the discharge valve being formed of an elastomer material and comprising a conically-shaped valve element at one end sloping outwardly toward the discharge passage, the discharge valve having a non-reentrant element at an opposite end thereof, a transverse perforate support web within the pump body, the piston including a hollow cylindrical stem having at a terminal edge thereof an inner annular beveled wall defining an annular valve seat with which an outer conical surface of the valve element engages in a discharge valve closing position, the support web having an opening through which the non-reentrant element extends for snap-fit engagement as the outer conical surface engages the valve seat, and a portion of the outer conical surface disengaging the valve seat to open flow of the liquid product from the chamber through a discharge port in the support and through the discharge passage in a discharge valve open position.