Foam spray head assembly

1. A foam spray head assembly comprising:

a press head connected with a cap;

a netted tube having a first net, a second net and a hollow tube;

a valve member having a first end and a second end, the first end of the valve member having a first recess, a second recess, an inlet valve and a release path, the second end of the valve member connected with the netted tube;

a main tube being a hollow tube and having a first tube, a second tube, a flange, a stop and a guide slot, the first tube located in the second recess and defining a first chamber, a first gap defined between an outer periphery of the first tube and an inner periphery of the second recess;

a piston unit having a first piston and a second piston;

the first piston having a third recess, a fourth recess, an air hole, an air slot and a seal ring, a wall defining the fourth recess movably in contact with an inner periphery of the first recess and movably sealing the inlet valve, the guide slot located between the stop and the seal ring which movably seals and opening the guide slot, the guide slot communicating with the air hole and the air slot;

the second piston having a fifth recess, a sixth recess and a protrusion, the second piston connected to the second tube;

a link unit extending through the main tube and having a first link, a second link and an engaging portion;

the first link connected to the second link by the engaging portion;

the first link having a contact neck which is movably in contact with the inner periphery of the first tube, an outlet defined between the first tube and the contact neck;

the second link having a contact portion which is movably in contact with the protrusion, an inlet defined between the protrusion and the contact portion;

the link unit located in the second tube, a second gap defined between the second tube and the link unit;

a resilient member mounted to the second tube and having one end contacting the flange;

a cylinder unit connected to the cap and having a first cylinder and a second cylinder, a ring located between the first and second cylinders;

the first piston repeatedly movable in the first cylinder and forming a sealed second chamber;

a wall defining the third recess movably in contact with an inner periphery of the first cylinder, a fourth chamber defined between the third recess, the first recess and the cap;

the second piston repeatedly movable in the second cylinder and forming a sealed third chamber, and

a valve being in contact with a passage in the second cylinder.

2. The assembly as claimed in claim 1 , wherein the valve is a bead which moves upward to open the passage and downward to close the passage.

3. The assembly as claimed in claim 1 , wherein the first link extends through the second link and is engaged with the engaging portion.

4. The assembly as claimed in claim 1 , wherein the second link extends through the first link and is engaged with the engaging portion.

5. The assembly as claimed in claim 1 , wherein the hollow tube of the netted tube has a liquid-air mixing area.

6. The assembly as claimed in claim 1 , wherein the first and second nets, are made by way of injection molding.

7. The assembly as claimed in claim 1 , wherein the apertures of the first and/or second nets are hexagonal apertures.

8. The assembly as claimed in claim 1 , wherein the cap has threads defined in an inner periphery thereof and the cap is adapted to be threadedly connected to a container.

9. The assembly as claimed in claim 1 , wherein the passage of the cylinder unit is connected with a suction hose.