US 9,642,502 B2 · Dual air chamber foam pumps, refill units and dispensers

Abstract

Exemplary two chamber foam pumps, refill units and dispensers utilizing the same are disclosed herein. An exemplary refill unit includes an inverted container having a neck located at the bottom of the container and a foam pump secured neck. The foam pump includes a first air pump chamber, a liquid pump chamber and a second air pump chamber. In addition, the pump includes a piston. The piston has a hollow central portion. A first air inlet aperture is located through a wall of the piston between the first air pump chamber and the hollow central portion. A liquid inlet aperture is located below the first air inlet aperture and between the liquid pump chamber and the hollow central portion. A second air inlet aperture is located through the wall the piston located below the liquid inlet aperture and between the second air pump chamber and the hollow central portion.

Claims20

Dependent claims

A refill unit comprising:

an inverted container having a neck located at the bottom of the container;
a foam pump secured neck;
the foam pump having:
a first air pump chamber;
a liquid pump chamber;
a second air pump chamber;
and
a piston;
the piston having:
a hollow central portion;
a first air inlet aperture through a wall of the piston between the first air pump chamber and the hollow central portion;
a liquid inlet aperture located below the first air inlet aperture and between the liquid pump chamber and the hollow central portion;
a second air inlet aperture through the wall the piston located below the liquid inlet aperture and between the second air pump chamber and the hollow central portion;
and
an outlet.

12 more elements

Dependencies are inferred from the claim text.

Dual air chamber foam pumps, refill units and dispensers

Life of this patent

Dual air chamber foam pumps, refill units and dispensers

Life of this patent

Abstract

Claims20