Quantitative dispensing device

A quantitative dispensing device adapted for dispensing a preselected quantity of flowable material, said quantitative dispensing device comprising:

• a mounting seat including a hollow base body and a first surrounding wall that extends upwardly from said base body, that defines an accommodating space, and that includes a slide slot unit extending downwardly from a top edge of said first surrounding wall;
• an elastic cap fixedly disposed in said accommodating space and defining an air-containing space;
• a hollow dispensing element including an upper open end that is connected to said elastic cap, and a lower open end that is opposite to said upper open end;
• a regulating member sleeved on said first surrounding wall of said mounting seat, rotatable relative to said mounting seat, and including a main body that includes at least one regulating unit, said at least one regulating unit having a stepped-shaped top surface that has a plurality of contacting surface portions having different heights away from a bottom edge of said main body;
• a rotatable seat disposed on and connected to an outer surface of said regulating member, co-rotatable with said regulating member relative to said mounting seat, and being operable to rotate so as to permit a selected one of said contacting surface portions to correspond in position to said slide slot unit of said mounting seat;
• and
• a press button disposed above said elastic cap and including a positioning unit that is slidable along said slide slot unit,
• wherein said press button is movable in a movement direction relative to said mounting seat between a raised position, where said positioning unit is spaced apart from said selected one of said contacting surface portions and said press button is not pressed downwardly against said elastic cap, and a pressed position, where said positioning unit abuts against said selected one of said contacting surface portions and said press button is pressed downwardly against said elastic cap, so that said elastic cap is deformed to expel air from said air-containing space through said dispensing element, and that said elastic cap stores a restoring force capable of returning said press button to the raised position and generates a suction force for drawing the flowable material into said dispensing element when said press button is released.