| 主权项 |
1. An airless pump dispenser for a fluid comprising a housing having a top and a bottom, an airless pump mounted in an upper portion of said housing, a movable piston having a top and a bottom mounted for movement within said housing from a starting position proximate to said bottom of said housing, thereby defining a dispensing space filled with said fluid between said movable piston in the starting position and said airless pump, and an end position proximate to said airless pump, a dispenser at said top of said housing for receiving said fluid from said airless pump and dispensing said fluid from said housing, and a spring member having a fully expanded position, and being disposed at said bottom of said housing, affixed to either said bottom of said movable piston or to said bottom of said housing, but not to both, said starting position proximate to said bottom of said housing being spaced from said bottom of said housing by said spring member in said fully expanded position whereby a space is provided to account for expansion within said housing filled with said fluid, to accommodate expansion of said fluid within said dispensing space when said dispensing space is full, said spring member having a sufficient driving force to return said movable piston to said starting position after accommodation of said expansion of said fluid within said housing, and having an insufficient driving force to independently move said movable piston within said dispensing space when said dispensing space is filled with fluid. |
