Patent ID: 7628294

Claim:
A pump for withdrawing a liquid or a pasty substance from a contractible supply container ( 1 ), said pump comprising a cylinder ( 5 ), a hollow plunger ( 6 ) configured within the cylinder ( 5 ), an external accessory pipe ( 7 ) configured at least partly within the hollow plunger ( 6 ) and an internal feed pipe ( 8 ) configured at least partly inside the external accessory pipe ( 6 ), said internal feed pipe ( 8 ) being displaceable relative to the external accessory pipe ( 7 ) with which it cooperates such that a displacement of internal feed pipe ( 8 ) constrains a displacement of the external accessory pipe ( 7 ), the external accessory pipe ( 7 ) being displaceable relative to the hollow plunger ( 6 ) and cooperating with the hollow plunger such that a displacement of the of the external accessory pipe ( 7 ) constrains a displacement of the hollow plunger ( 6 ), the hollow plunger ( 6 ) being displaceable relative to the cylinder ( 5 ) that is fitted with at least one aperture ( 5 a ) through which communication may be established between a space of the supply container ( 1 ) and the space inside the cylinder ( 5 ) and which can be opened and closed by the hollow plunger ( 6 ), said hollow plunger ( 6 ) being fitted with an aperture ( 6 a ) which can be opened and closed jointly by the internal feed pipe ( 8 ) and the external accessory pipe ( 7 ), said external accessory pipe ( 7 ) being fitted with an aperture ( 7 a ) that can be opened and closed by the internal feed pipe ( 8 ), at least one aperture ( 8 a ) being present in the internal feed pipe ( 8 ) and being opened and closed by the external accessory pipe ( 7 ) such that the liquid or pasty substance can be released through the internal feed pipe ( 8 ) into the ambience and simultaneously can be aspirated from the supply container ( 1 ) into the cylinder ( 5 ).