Liquid dispenser has piston which slides in cylinder and is fitted with stop, cylinder carrying series of stops which can be rotated so that one cooperates with stop on piston, allowing volume of liquid dispensed to be varied

摘要

The liquid dispenser has a piston (2) which can slide vertically in a cylinder (1) and is fitted with a suction tube (7) with valve (8). The piston carries a stop (15) on one side and the cylinder carries a series of stops (24 -27) which can be rotated so that one of them cooperates with the stop on the piston, allowing the volume of liquid dispensed to be varied.