Coffee mill

A coffee mill comprising a vertical screw of generally cylindrical form, provided with at least one helical groove and mounted to cooperate with a truncated conical crushing chamber having a substantially elliptical section decreasing in diameter towards a cylindrical bore at the lower end of the chamber, which bore serves to guide the lower part of the said screw, said groove having a pitch which decreases progressively towards its lower end, and a depth which decreases progressively to zero as it approaches its lower end, the cylindrical bore having at least two longitudinally extending diametrically opposed channels in the wall thereof, at least one of said channels communicating with a duct adapted to receive the upper part of a delivery chute for the delivery of milled coffee under gravity.