Abstract: The gyratory crushing apparatus includes a bowl having an inner wall which defines a chamber for receiving frangible or friable material to be crushed, the chamber having a central axis and terminating in a throat defining a central discharge opening, a crushing head disposed in the bowl and having upper and lower ends which are interconnected by a peripheral wall which is concentric with respect to a gyratory axis of the head, a support assembly by which the head is supported in the chamber and which includes a shaft, and a drive arrangement coupled to the shaft. The shaft is of integral construction having upper and lower portions, and the head is mounted on the upper portion, with the upper portion having an axis substantially co-incident with the gyratory axis of the head.

Abstract: The gyratory crusher includes a bowl which defines a chamber for receiving material to be crushed and a discharge opening at the base thereof through which crushed material is able to discharge. A crushing head is mounted in the bowl at an offset position with respect to a central axis of the bowl, and a drive assembly is operable for driving the crushing head within the bowl for imparting gyratory motion to the head about a gyratory axis inclined with respect to and intersecting the central axis, whereby frangible or friable material received into the chamber is subjected to crushing between an inner peripheral surface of the bowl and an outer peripheral surface of the head by the gyratory motion of the head.