Patent ID: 6955313

Claim:
A mill of two or more hammers for the making of inert material, comprising: a hopper for a load with a window, a housing coupled to the hopper so as to receive material from the hopper, the housing containing: a principal rotor having a relative peripheral orbit, a protection for anti usury coupled to said principal rotor; at least one hammer coupled to said principal rotor, a set of armored walls substantially surrounding said principal rotor, a secondary rotor having a relative peripheral orbit, such that the diameter of the relative principal peripheral orbit is greater than that of the secondary rotor, and further such that the ratio between the diameters of the principal and the secondary peripheral orbits is variable; according to the dimensions of the inert material to be treated; and wherein a peripheral circumferences of each of the two rotors is placed, one in comparison to the other, substantially near each other, and wherein the secondary rotor has a number of blades in an equal number to that of the hammers of the principal rotor; and wherein said secondary rotor is surrounded by at least one lateral curvilinear invitations having superior edges inside beveled and tangentially joined to the relative peripheral orbit; and wherein the hammers are set to a distance by the armored walls and the same have substantially no registers of approach; and wherein the protections for anti usury have a width substantially equal to the inside width of the mill.