Equipment for the collection and the controlled delivery of liquids with volumetric dosage

Apparatus for the controlled withdrawal and dispensing of liquids with volumetric dosage, comprising:

• a structure on which a platform houses a first series of containers containing liquid substances destined to be picked up and dosed and a second series of containers adapted to receive predetermined doses of the substances contained in the containers of the first series, the apparatus further comprising means for withdrawing the liquids from the containers of the first series and dispensing such liquids into the containers of the second series in predetermined doses, wherein on each container of the first series is inserted a half-pipette comprising a barrel defining a volume which can be filled with the liquid of the respective container of the first series, a piston devoid of actuation stem, and a needle through which the liquid can be aspirated and injected, and wherein said means for withdrawing the liquids from the containers of the first series and dispensing the liquids into the containers of the second series comprise a unit provided with a vertical rod adapted to engage and actuate the piston of each half-pipette, said unit being constrained to a carriage that, in turn, can be moved above the platform, said unit being movable vertically from and towards the platform, wherein said rod comprises a first part connected to an actuator which controls its vertical movement and a second part constituted by a tubular body in which air can be introduced for the expansion of an expandable pad adapted to engage a piston cavity provided on each piston when it is expanded due to the introduction of air in said second part, such that the expandable pad has an expanded configuration in which the expandable pad engages the piston cavity, and a non-expanded configuration in which the expandable pad does not engage the piston cavity.