Inkjet printer cartridge refill dispenser with security lock for spent refill

摘要

A printing fluid dispenser including a deformable container for printing fluid; a housing locating the deformable container between a base slidingly engaging a plunger; and an outlet coupled to the deformable container and arranged to convey the printing fluid to a point external to the housing; wherein the base and plunger engage each other by means of one or more complementary protrusions and indentations formed into opposing walls of the base and plunger and positioned to prevent disengagement of the plunger from the base subsequent to operation of the dispenser.