Patent ID: 8535264

Claim:
A milk-extraction device with a drive motor ( 1 . 1 ) and a vacuum generation unit ( 1 ) having a vacuum-generating device ( 1 . 2 , 1 . 2 ′), a change-over unit ( 2 ) attached via pressure lines to the vacuum-generating device ( 1 . 2 , 1 . 2 ′) including a rotational valve having a rotatingly driven change-over member ( 2 . 10 ) which determines extraction cycles, and at least one extraction attachment ( 10 , 10 ′) which is brought into a flow connection with the change-over unit ( 2 ) and having a suction funnel ( 6 ) which can be applied to a breast, and a milk receptacle ( 7 ), the milk-extraction device comprising: for being rotatorily driven, the change-over member ( 2 . 10 ) coupled via a gear train ( 20 ) with the drive motor ( 1 . 1 ) of the vacuum generation unit ( 1 ), the gear train ( 20 ) having a drive worm gear ( 23 ) seated in an extension of or parallel to a motor shaft of the drive motor ( 1 . 1 ) which drives a first toothed disk ( 24 ), and the first toothed disk ( 24 ) is orthogonally seated relative to the motor shaft and is engageable by an axial displacement with at least two further toothed disks ( 25 , 26 ) with a number of teeth different from each other, which determine a stepping of a number of revolutions of the change-over member ( 2 . 10 ), wherein the gear train ( 20 ) is designed as an adjusting unit ( 4 ) for a mechanical continuous setting of a number of revolutions of the rotatingly driven change-over member ( 2 . 10 ) of the rotational valve, or at least a stepped two-stage setting of a differing number of revolutions of the change-over member ( 2 . 10 ), wherein for operating the vacuum generation unit, a crankshaft ( 22 ) is arranged in the gear train ( 20 ), to which at least two vacuum-generating devices ( 1 . 2 , 1 . 2 ′) are coupled by at least a respective one connected intermediate member ( 22 . 1 ), and wherein the at least two vacuum-generating devices ( 1 . 2 , 1 . 2 ′) are axially offset opposite each other at identical angular distances around the crankshaft ( 22 ).