Patent ID: 9427118
Filing Date: 2016-08-30
CPC Classification: A47K,B05B

Claim Text:
1. A foam dispensing mechanism comprising: a container for containing a foamable substance; a dispense output; a mixing chamber having an output opening communicating with the dispense output; a pressure member for exerting pressure on the substance such as to force at least a part of the substance to flow from the container to the dispense output, wherein the pressure member comprises a piston arranged in the container, the piston dividing an interior of the container into a substance comportment below the piston and an air compartment above the piston; an axially displaceable actuator for actuating the pressure member; a first flow channel for the foamable substance extending from the substance compartment to an entrance opening of the mixing chamber; a first valve member arranged in the first flow channel, the first valve member having a free condition and a closed condition for blocking the first flow channel; a second flow channel for air extending from the substance compartment to the entrance opening of the mixing chamber; a second valve member arranged in the second flow channel, the second valve member having a free condition and a closed condition for blocking the second flow channel; a third flow channel for air extending from the air compartment of the container to the substance compartment of the container; a third valve member arranged in the third flow channel, the third valve member having an open condition and a closed condition for blocking the third flow channel; a fourth flow channel for air connecting the air compartment of the container to an exterior of the container; and a fourth valve member arranged in the fourth flow channel, the fourth valve member having an open condition and a closed condition for blocking the fourth flow channel; wherein an entrance opening of the second flow channel is closer to the piston than an entrance opening of the first flow channel; wherein the mechanism has a rest condition in which the first valve member is closed, the second valve member is closed, and the fourth valve member is closed, while preferably the third valve member is open; wherein the mechanism has an initial actuation condition in which the first valve member is free, the second valve member is free, the third valve member is closed, and the fourth valve member is closed; wherein the mechanism has a compression condition in which the first valve member is free, the second valve member is free, the third valve member is closed, and the fourth valve member is open; wherein the mechanism has a return condition in which the first valve member is closed, the second valve member is closed, the third valve member is open, and the fourth valve member is open; and wherein the actuator is arranged such that: