Actuator-inverted constant-volume ejection mechanism and aerosol-type product provided with the actuator-inverted constant-volume ejection mechanism

An actuator-inverted constant-volume ejection mechanism comprising:

• a stem which serves a function of a constant-volume chamber inflow valve, the stem being biased by an elastic force in a first direction toward a stationary mode position in an aerosol container;
• a valve member which serves the function of a constant-volume chamber outflow valve, the valve member being fixed to the stem;
• a longitudinal pressing member attached to the valve member in such a manner that the longitudinal pressing member can move in the first direction and a second direction which is opposite to the first direction, the longitudinal pressing member serving the function of the constant-volume chamber outflow valve together with the valve member, and the longitudinal pressing member having a plurality of projections like needles of a needlepoint holder that are pressed against an ejection target area, an ejection passage to an external space and a constant-volume-chamber-forming cylindrical portion;
• a lateral pushing member for driving the longitudinal pressing member in the second direction;
• a constant-volume chamber defined by the stem, the valve member and the longitudinal pressing member for accommodating a content;
• a valve-action producing portion which is part of the stem constituting the constant-volume chamber inflow valve which shifts to an open state in which the content of a container body flows into the constant-volume chamber with the stem moving in the second direction, overwhelming the elastic force, as a result of an ejecting action performed on either of the longitudinal pressing member and the lateral pushing member, and is kept in a closed state by an effect of the elastic force biasing the stem in the first direction when the ejecting action is not performed on either of the longitudinal pressing member and the lateral pushing member;
• a valve-action producing portion located between the valve member and the longitudinal pressing member, the valve-action producing portion constituting the constant-volume chamber outflow valve which stays in a closed state as a result of a movement of the longitudinal pressing member in the second direction caused by the ejecting action performed on either of the longitudinal pressing member and the lateral pushing member, and shifts to an open state in which the content of the constant-volume chamber is caused to flow into the ejection passage by a force exerted on the longitudinal pressing member in the first direction after the ejecting action has been terminated.