Dispensing pump for container

A pump that mounts to a bottle, makes a foam of the liquid in the bottle and dispenses the foam, the pump comprising:

• a pump body that forms a liquid pump body that defines a pump body cavity that extends through the liquid pump body to an inlet passage that communicates with an interior of the bottle;
• an inlet valve mounted to the liquid pump body that opens in response to pressure in the bottle that is greater than pressure in the pump body cavity and that closes to prevent communication between the interior of the bottle and the pump body cavity in response to pressure in the pump body cavity that is greater than pressure in the bottle;
• a pump head including a nozzle section at an upper end of the pump head and a head tube extending from the nozzle section, the nozzle section defines a mouth, the pump head defines a pump head cavity that extends from the mouth through the head tube, and an outer surface of the head tube is sized and configured to closely fit within the pump body cavity so that the head tube slidingly moves within and along the pump body cavity;
• a porous member is positioned within the pump head cavity;
• a spring support sized to at least partially extend into the pump head cavity, the spring support:
• formed to prevent passage of liquid around the spring support into the pump head tube cavity,
• defining a spring support passage that communicates with the pump head cavity and the pump body cavity,
• the spring support extends through the pump head cavity from the location at which the spring support prevents passage of liquid around the spring support into the head tube cavity, and
• at least a portion of the spring support in the pump head cavity is separated from the pump head tube to define an air passage between the pump head tube and the spring support that communicates with the pump head cavity;
• an outlet valve mounted to the spring support to permit communication between the pump head cavity and the pump body cavity in response to pressure in the pump body cavity and that closes to prevent communication between the pump head cavity and the pump body cavity when not opened by pressure in the pump body cavity;
• a pump spring positioned at least partially within the pump body cavity that urges the pump head tube and spring support away from the inlet passage;
• a flexible diaphragm secured to the pump head at a location separated from the pump body, extending around the pump head and extending from the location at which it is secured to the pump head to the pump body, the diaphragm, the pump body and the pump head defining an air chamber and movement of the pump head tube toward the inlet passage deforms the diaphragm and thereby reduces the volume of the air chamber;
• the pump head defining one or more air passageways that communicate with the air chamber and the air passage defined by the pump head tube and the spring support
• whereby liquid passes through the spring support passage and air passes through the air passage to mix at a location between the spring support and the porous member.