Grinding crusher

A grinding crusher mechanism having a vertically disposed axis comprising a tubular shell having an upper extent and provided with an open bottom for entry of a high-speed drive means, a high-speed, controlled, drive means extending through said open bottom, a casing within the tubular shell secured to said drive means and rotatable thereby, said casing forming a crushing chamber and including a bottom and inner peripheral surface walls of different diameter connected by stepped walls axially of said casing, an axially aligned support pipe through which material to be crushed is directed onto said bottom of said casing, said pipe including angularly spaced plural grinder members extending radially therefrom and cooperating with said stepped walls and said inner peripheral surface walls of said casing which cooperate to crush material which is thrown centrifually against said plural grinder members and said inner peripheral walls and classifying means for receiving pulverized material from said tubular shell and for returning unpulverized material to said crusher mechanism.