Patent ID: 7316336

Claim:
Dosing equipment for quantitative dosing of small amounts of liquids, comprising a body ( 1 ), a flexible bellows ( 5 ) attached to said body and defining a liquid space ( 15 ), a dosing tip ( 19 ) communicating with said liquid space, and an actuator ( 7 ) for moving said bellows so that constriction of said liquid space causes a dose to be discharged from said dosing tip, wherein said actuator ( 7 ) is formed of two parts ( 8 , 9 ) moving relative to one another and acting magnetically on each other through an attracting or repelling force, one of the parts being attached to said body ( 1 ) of said dosing equipment and the other being connected to said bellows ( 5 ) to move it over a range of movement, said bellows acting with a spring force against said actuator, said actuator comprising one of two parts of a current coil ( 9 ) in cooperation with current adjusting means ( 12 ), said actuator working against said spring force of said bellows and generating movements of said bellows by changing magnitude of electric current passing through said coil, said current being adjustable with an adjusting range to permit selected dose volumes to be produced by said bellows movements of selected lengths within a range of movement.