Metering device for liquids

A metering device for liquids with a container, which has at least one elastically deformable wall section, and a metering vessel, characterized by the following features:

• the container has a body for containing liquid, and an outlet with a withdrawal opening which, appropriate for the liquid to be metered, is so narrow, that liquid escapes only when the deformable wall section is indented, and the liquid is prevented from freely flowing out by itself by remaining securely suspended at the container opening when the withdrawal opening faces downwardly;
• and
• the metering vessel having side walls, a closed bottom and an open top and being detachably connected with the container in such a manner that the open top surrounds the withdrawal opening;
• wherein a metering process is carried out when the metering vessel relative to the container is in an upright position with the open top being above the closed bottom, and only upon indentation of the at least one deformable wall section, when the selected metered amount of liquid fills the metering vessel pressure on the at least one deformable wall section is removed, upon removal of the pressure no liquid can be sucked back into the container because means are provided for maintaining separate the liquid level in the metering vessel from the withdrawal opening by an air gap, when the pressure on the at least one deformable wall is released means are provided for aspirating air into the container, at the end of the metering process means are provided for removing the upright metering vessel, in the upright position from the container, and because of the narrowness of the withdrawal opening, liquid cannot escape from the container unless further pressure is exerted on the at least one deformable wall of the container.