Patent ID: 7146867

Claim:
A proportioning device, comprising: a manually operable actuating device ( 3 ), a sensor ( 12 ) associated with the actuating device ( 3 ) for detecting a force manually exerted on the actuating device ( 3 ), an electric driving motor ( 14 ), an electric control ( 17 ) connected to the sensor ( 12 ) and electric driving motor ( 14 ) for controlling the driving motor ( 14 ) during the detection by the sensor of a force exerted on the actuating device ( 3 ), the electric control ( 17 ) switching the electric driving motor ( 14 ) off when the sensor ( 12 ) detects a heavy increase in the force being applied to the actuating device ( 3 ), indicating that the actuating device ( 3 ) has reached a stop; an electric voltage supply ( 18 ) connected to the sensor ( 12 ), electric driving motor ( 14 ), and electronic control ( 17 ), and a displacement device ( 5 , 6 ) coupled to the actuating device ( 3 ) and electric driving motor ( 14 ) for proportioning a liquid.