| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of components of a contents discharge mechanism which receives contents in a constant quantity chamber when a stem is advanced by an operation of a pushbutton or the like and discharges when the stem is returned. SOLUTION: Since a stem rubber 12 is equipped with a function of sealing an inlet part to the constant quantity chamber 15 and a function of moving the stem 11 upward by its self-reset force for opening an outlet part of the chamber 15, a member for opening/closing an inlet of the chamber 15 or a spring for returning the stem need not be provided separately. When the pushbutton is pressed, a tapered surface lid of the stem and a protrusion 14b of a piston member are brought into contact with each other, and an upper rim 14a comes away from the stem rubber 12 to have the contents reserved in the constant quantity chamber 15. After the pressed pushbutton is released, the piston member 14 moves upward to cause the upper rim 14a to be sealed by the stem rubber 12. In addition, the stem 11 further moves upward by the self-reset force due to deformation of the stem rubber 12 when it is advanced, forming a gap 14c between the tapered surface 11d and the protrusion 14b of the piston member to cause the contents in the chamber 15 to be discharged. |
