Dispensing device

A dispensing device, comprising:

• a cap that is mounted on a neck portion of a container;
• a cylinder that is fitted onto to an inner section of the cap while being communicated with an internal space of the container;
• a piston that reciprocates in an axial direction within the cylinder while being in contact with an inner surface of the cylinder;
• a nozzle member that is reciprocatably attached to the cap to be pushed in the axial direction toward the cylinder thereby pushing the piston;
• a returning mechanism that pushes the piston back to an initial position;
• a flow passage passing through the piston in the axial direction;
• a nozzle hole that is communicated with one of openings of the flow passage;
• an air chamber that is formed in one of internal spaces of the cylinder divided by the piston to which the other opening of the flow passage opens;
• a valve mechanism that connects the air chamber to the internal space of the container and the flow passage when the nozzle member is pushed down;
• an air inlet hole passing through a cylindrical portion of the cylinder in a thickness direction to connect the internal space of the container to an external space;
• and
• an action valve that is fitted onto an outer circumferential surface of the cylinder to close the air inlet hole, and that is isolated from the outer circumferential surface of the cylinder to introduce external air to the container when an internal pressure of the container is reduced lower than an external pressure,
• wherein:
• the cylinder comprises a lower end portion and an upper end portion that is diametrically larger than the lower end portion;
• and
• the action valve comprises
• a ring-shaped annular section whose inner diameter is larger than at least an outer diameter of the lower end portion, and
• a valve section that extends from the annular section in the axial direction to close the air inlet hole while maintaining a clearance from the air inlet hole in a radial direction of the container, so as to shield the air inlet hole from the internal space of the container.