Patent ID: 8360287

Claim:
A foam pump for pumping a foamable liquid from a foamable liquid source, the foam pump comprising: a compressible premix chamber having an interior volume for receiving the foamable liquid from the foamable liquid source; a premix chamber air inlet valve for allowing air to pass into the premix chamber; a collapsible air chamber surrounding said premix chamber air inlet valve and fluidly communicating with said interior volume of said premix chamber through said premix chamber air inlet valve, said collapsible air chamber having an expanded volume and a compressed volume, wherein, when said collapsible air chamber is moved from its expanded volume to its compressed volume, air within said collapsible air chamber is forced into said premix chamber through said premix chamber air inlet valve and mixes with the foamable liquid received in the premix chamber; and an outlet communicating with said premix chamber and receiving foamable liquid and air from said premix chamber upon compression of said collapsible air chamber from its expanded volume to its compressed volume.