| 摘要 |
PROBLEM TO BE SOLVED: To provide a foam discharger capable of demonstrating a back suction function by using the motion of an air piston to a stem.SOLUTION: A lowering head 72 is attached to an upper end of a stem 50 erected from a cylindrical piston 42 for liquid which is elevated and lowered in a cylinder 26 for liquid in an upwardly urged state. The stem 50 is composed of a stem base half section 52 and a stem front end half section 60. An outward flange-shaped top wall 66 is outwardly projected from an outer surface of the stem front end half section 60. A first seal cylindrical part 68 surrounding the stem base half section 52 is vertically projected from a back side of the outward flange-shaped top wall 66, and a second seal cylindrical part 88 in airtight-contact with a circumferential surface of the first seal cylindrical part 68 is vertically projected from an upper surface of a ring-shaped wall 84, respectively. A space surrounded by the first seal cylindrical part 68, the second seal cylindrical part 88, the outward flange-shaped top wall 66, the upper surface of the ring-shaped wall 84, and the outer circumferential surface of the stem base half section 52 is formed into an auxiliary air chamber Rfor the back suction. |
