公开(公告)号：US20180200744A1

公开(公告)日：2018-07-19

申请号：US15743358

申请日：2016-07-16

Applicant: Alternative Packaging Solutions, LLC

Inventor： Christopher John AWORTH

IPC: B05B9/08 ,  B05B11/00

CPC classification number: B05B9/0883 ,  B05B11/3011 ,  B05B11/3076 ,  B05B11/3091

Abstract: A pump mechanism for a spray dispenser, comprising a piston assembly movable with respect to a housing between charged and initial positions. The piston assembly comprises liquid and gas seals, being movable boundaries of respective chambers whose volume is determined by the position of the seal relative to the housing. When the piston assembly moves toward the charged position, the volume of the liquid chamber increases to draw liquid into the liquid chamber and the changing volume of the gas chamber changes the pressure of gas in that chamber from its pressure when the piston assembly was in the initial position. This biases the piston assembly to return from the charged position toward the initial position, that return movement of the piston assembly pressurising the liquid in the liquid chamber for dispensing.