| 摘要 |
PROBLEM TO BE SOLVED: To prevent liquid from entering a large diameter cylinder to reduce the quantity of foaming air in a well-known pump vessel for discharging foam provided so that a cylinder member having a small diameter part and a large diameter part is hung into a vessel body, and also that a working member having small diameter and large diameter cylindrical pistons are made to stand up from in the cylinder member, and that by the vertical movement of the working member, liquid sucked up through the small diameter cylinder and air sucked up through the large diameter cylinder are mixed and foamed to discharge them from a nozzle. SOLUTION: A large diameter cylindrical piston 40 is separated from the lower end of a large diameter stem 29, and the large diameter cylindrical piston 40 is positioned between a flange 26 attached to a small diameter stem 23 and the lower end of the large diameter stem 29. When the working member 20 is pressed, the large diameter stem 29 presses the large diameter cylindrical piston 40 and also the flange 26 is separated from the large diameter cylindrical piston 40 to open an inflow port of an air outflow path 25 and cause air in the large diameter cylinder to flow out. When the working member rises, the flange 26 is contacted with the back surface of the large diameter cylindrical piston 40 to close the inflow port. |
