Patent ID: 6131820
Filing Date: 2000-10-17
Classification: B05B

Abstract:
A trigger actuated prump sprayer comprising, a pump body having a cylindrical discharge barrel in communication with a variable volume pump chamber defined by a manually reciprocalable piston operating between pressure and return strokes within a pump cylinder of said body for discharging liquid product through a discharge orifice at a downstream end of said barrel, a spin mechanics element fixed at said downstream end, a discharge valve assembly slidably disposed within said barrel and including an elastomeric circular valve disc and means engaging said spin mechanics element to therewith define a variable volume suction chamber, said valve disc being in sealing engagement along its outer periphery with an inner wall of said barrel in a valve closed condition during the piston return strokes to prevent the passage of liquid product from said discharge barrel to said pump chamber, at least a portion of said outer periphery disengaging said inner wall in a valve open condition during the piston pressure strokes to permit the passage of liquid product under pressure through said discharge orifice, said valve assembly being slidably movable along said discharge barrel toward and away from said spin mechanics element respectively during said valve open and valve closed conditions, said suction chamber being expanded during the movement away from said element for retracting liquid product inwardly of said discharge orifice to avoid any formation of dribbles and drips thereat.