Foam pump assembly

1. A foam pump assembly for dispensing foam, comprising:

a dual piston pump engine having an air cylinder and fluid cylinder, said cylinders having an air piston and a liquid piston, respectively, said liquid cylinder having a liquid inlet valve and a liquid outlet valve, said air cylinder having an air inlet valve and an air outlet, a mixing chamber in communication with the liquid cylinder through the liquid outlet valve for receiving liquid, and in communication with the air cylinder through the air outlet for receiving air, an outlet chamber in communication with the mixing chamber and in communication with a pump outlet for dispensing foam, said outlet chamber comprising a plurality of stacked and spaced disks with support members between the disks which cross each other providing a flow path with successive turns, whereby when air and fluid is fed into said mixing chamber foam is created which passes into the outlet chamber, through the flow path and out of the pump outlet.

2. The foam pump assembly according to claim 1 , wherein the edges of the disks have a reduced diameter along at least a portion of the circumference to define a flow path passage between the disk edge and a wall of the outlet chamber.

3. The foam pump assembly according to claim 1 , wherein at least one end of one support chamber wall extends to a wall of the outlet chamber.

4. A foam pump assembly for dispensing foam, comprising:

a dual piston pump engine having an air cylinder and fluid cylinder, said cylinders having an air piston and a liquid piston, respectively, said liquid cylinder having a liquid inlet valve and a liquid outlet valve, said air cylinder having an air inlet valve and an air outlet, a mixing chamber in communication with the liquid cylinder through the liquid outlet valve for receiving liquid, and in communication with the air cylinder through the air outlet for receiving air, an outlet chamber in communication with the mixing chamber and in communication with a pump outlet for dispensing foam, said outlet chamber comprising a plurality of stacked and spaced disks contained in a cylinder with support members between the disks which cross each other to define a flow path with successive turns, whereby when air and fluid is fed into said mixing chamber foam is created which passes into the outlet chamber, through the flow path and out of the pump outlet.

5. The foam pump assembly according to claim 4 , wherein the edges of the disks have a reduced diameter along at least a portion of the circumference to define a flow path passage between the disk edge and a wall of the outlet chamber.

6. The foam pump assembly according to claim 4 , wherein at least one end of one support member extends to a wall of the outlet chamber.

7. A foam pump assembly for dispensing foam, comprising:

a dual piston pump engine having an air cylinder and fluid cylinder, said cylinders having an air piston and a liquid piston, respectively, said liquid cylinder having a liquid inlet valve and a liquid outlet valve, said air cylinder having an air inlet valve and an air outlet, a mixing chamber in communication with the liquid cylinder through the liquid outlet valve for receiving liquid, and in communication with the air cylinder through the air outlet for receiving air, an outlet chamber in communication with the mixing chamber and in communication with a pump outlet for dispensing foam, said outlet chamber comprising a plurality of stacked and spaced disks contained in a cylinder with support members between the disks which cross each other, wherein the edges of the disks have a reduced diameter along at least a portion of the circumference to define a flow path passage between the disk edge and a wall of the outlet chamber to define a flow path with successive turns, whereby when air and fluid is fed into said mixing chamber foam is created which passes into the outlet chamber, through the flow path and out of the pump outlet, wherein the edges of the disks have a reduced diameter along at least a portion of the circumference to define a flow path passage between the disk edge and a wall of the outlet chamber.

8. The foam pump assembly according to claim 7 , wherein at least one end of one support member extends to a wall of the outlet chamber.

9. A foam pump assembly for dispensing foam, comprising:

a dual piston pump engine having an air cylinder and fluid cylinder, said cylinders having an air piston and a liquid piston, respectively, said liquid cylinder having a liquid inlet valve and a liquid outlet valve, said air cylinder having an air inlet valve and an air outlet, a mixing chamber in communication with the liquid cylinder through the liquid outlet valve for receiving liquid, and in communication with the air cylinder through the air outlet for receiving air, an outlet chamber in communication with the mixing chamber and in communication with a pump outlet for dispensing foam, said outlet chamber providing a flow path with successive turns, wherein the outlet chamber comprises a plurality of stacked and spaced disks contained in a cylinder with support members between the disks which cross each other which define the flow path, wherein the edges of the disks have a reduced diameter along at least a portion of the circumference to define a flow path passage between the disk edge and a wall of the outlet chamber, wherein support members are provided between the disks to support and space the disks, wherein the support members comprise a pair of support chamber walls which cross each other, and wherein at least one end of one support chamber wall extends to a wall of the outlet chamber, whereby when air and fluid is fed into said mixing chamber foam is created which passes into the outlet chamber, through the flow path and out of the pump outlet.

10. A foam pump assembly for dispensing foam, comprising:

a dual piston pump engine having an air cylinder and fluid cylinder, said cylinders having an air piston and a liquid piston, respectively, said liquid cylinder having a liquid inlet valve and a liquid outlet valve, said air cylinder having an air inlet valve and an air outlet, a mixing chamber in communication with the liquid cylinder through the liquid outlet valve for receiving liquid, and in communication with the air cylinder through the air outlet for receiving air, the mixing chamber having a defined cross sectional axial area and a plurality of stacked and spaced disks with support members between the disks which cross each other, an outlet passage having a single orifice smaller than said mixing chamber cross sectional area, and at least one outlet chamber in communication with the mixing chamber through said one orifice outlet and in communication with a pump outlet for dispensing foam, whereby when air and fluid is fed into said mixing chamber foam is created which passes through the orifice outlet, through the outlet chamber and out of the pump outlet.

11. The foam pump assembly according to claim 10 , further comprising a container for holding a source of liquid.

12. A foam pump assembly for dispensing foam, comprising:

a dual piston pump engine having an air cylinder and fluid cylinder, said cylinders having an air piston and a liquid piston, respectively, said liquid cylinder having a liquid inlet valve and a liquid outlet valve, said air cylinder having an air inlet valve and an air outlet, a mixing chamber in communication with the liquid cylinder through the liquid outlet valve for receiving liquid, and in communication with the air cylinder through the air outlet for receiving air, the mixing chamber having a defined cross sectional axial area and a plurality of stacked and spaced disks with support members between the disks which cross each other, an outlet passage having a plurality of successive orifice plates each defining at least one orifice smaller than said mixing chamber cross sectional area, and a plurality of successive outlet chambers between the mixing chamber and a pump outlet for dispensing foam, whereby when air and fluid is fed into said mixing chamber foam is created which passes through the orifices and outlet chambers and out of the pump outlet.

13. A foam pump assembly for dispensing foam, comprising:

a dual piston pump engine having an air cylinder and fluid cylinder, said cylinders having an air piston and a liquid piston, respectively, said liquid cylinder having a liquid inlet valve and a liquid outlet valve, said air cylinder having air inlet valve and an air outlet, a mixing chamber in communication with the liquid cylinder through the liquid outlet valve for receiving liquid, and in communication with the air cylinder through the air outlet for receiving air, an outlet chamber in communication with the mixing chamber and in communication with a pump outlet for dispensing foam, said outlet chamber comprising a plurality of stacked and spaced disks with support members between the disks which cross each other to define a plurality of sub-chambers connected in series to provide a series flow path for the foam, and defining restricted passageways between the adjacent sub-chambers, whereby when air and fluid is fed into said mixing chamber foam is created which passes into the outlet chamber, through the flow path and out of the pump outlet.

14. The foam pump assembly according to claim 13 , wherein the edges of the disks have a reduced diameter along at least a portion of the circumference to define a flow path passage between the disk edge and a wall of the outlet chamber.

15. The foam pump assembly according to claim 13 , wherein at least one end of one support chamber wall extends to a wall of the outlet chamber.

16. The foam pump assembly according to claim 1 , further comprising a container for holding a source of liquid.

17. The foam pump assembly, according to claim 4 , further comprising a container for holding a source of liquid.

18. The foam pump assembly according to claim 7 , further comprising a container for holding a source of liquid.

19. The foam pump assembly according to claim 9 , further comprising a container for holding a source of liquid.

20. The foam pump assembly according to claim 13 , further comprising a container for holding a source of liquid.