Liquid dosing devices

A dosing device for dispensing metered doses of liquid from a resiliently squeezable container, the dosing device comprising:

• a front component defining a front discharge opening, a control chamber and an obturator movable in the control chamber;
• the dosing device defining an outlet passage for liquid from the container leading past or around the control chamber to the discharge opening;
• the control chamber having one or more rear control openings to admit a restricted flow of liquid from the container interior into the control chamber, and
• the obturator being movable in the control chamber and adapted to advance during dispensing, under the influence of liquid flowing into the control chamber through the one or more control openings, forwardly from a rear position to a blocking position where it blocks the outlet passage to terminate a dose;
• wherein the obturator is in the form of a control piston comprising a central disc and a set of axially-projecting guide lugs around the edge of the central disc, said guide lugs projecting axially primarily on one side of the disc;
• and
• the control chamber has a rear wall of which the inner surface is directed along the control chamber in the direction of movement of the obturator, a set of said control openings being distributed around said rear wall, and the obturator lying against the rear wall in the rear position thereof.

A dosing device for dispensing metered doses of liquid from a resiliently squeezable container, the dosing device comprising:

• a component defining a discharge opening, a control chamber and an obturator movable in the control chamber;
• the dosing device defining an outlet passage for liquid from the container leading past or around the control chamber to the discharge opening;
• the control chamber having one or more control openings to admit a restricted flow of liquid from the container interior into the control chamber;
• the obturator being movable in the control chamber and adapted to advance during dispensing, under the influence of liquid flowing into the control chamber through the one or more control openings, to a blocking position where it blocks the outlet passage to terminate a dose;
• and
• wherein said obturator is in the form of a flow-control piston including a flow-blocking panel, a first protruding portion extending in a first direction away from said flow-blocking panel and a second protruding portion extending in a second direction away from said flow-blocking panel, wherein said first direction is opposite to said second direction and said first projecting portion is axially longer than said second projecting portion.

A dosing device for dispensing metered doses of liquid from a resiliently squeezable container, the dosing device comprising:

• a component defining a discharge opening, a control chamber and an obturator movable in the control chamber;
• the dosing device including an outlet tube having a lower edge and defining a passage for liquid from the container which has entered the control chamber to flow through to the discharge opening;
• the control chamber including an opening to admit a flow of liquid from the container interior into the control chamber, said opening having a lower edge axially above the lower edge of said outlet tube;
• and
• the obturator being movable in the control chamber and adapted to advance during dispensing, under the influence of liquid flowing into the control chamber through said opening, to a blocking position where it blocks the outlet passage to terminate a dose.