DISPENSING CORROSIVE LIQUID FROM BOTTLES

摘要

A liquid dispensing device has a cylinder 3 within which is slidable a plunger 5 urged to an extended position by a spring 16. A rod 10 is threaded into the plunger 5 and carries an adjustment knob 13, rotation of which varies the volume swept by the plunger 5 in a successive pressure stroke. The end of the pressure stroke is defined by the plunger head 6 engaging the base 33 of the cylinder 3. The plunger 5 carries a pointer 20 co-operating with a scale marked on the outer casing 1 to indicate the volume of liquid dispensed, this being determined by the adjusted position of the knob 13.