Patent ID: 7216823

Claim:
System for securing the movable jaw on a conical head of a conical or gyratory stone crusher, comprising a bowl, surmounted by a hopper for supplying material to be crushed, a fixed truncated conical jaw mounted coaxially of the bowl, a crushing head mounted on a principal shaft coaxial to the fixed jaw, whose geometric axis makes an acute angle with that of the drive shaft so as to communicate to the head a nutatory movement when the eccentric turns, and a conical movable jaw having a circular opening at its summit, mounted on the head and gripped on the latter by means of a blocking element secured to the head and bearing on the summit of the movable jaw, characterized in that said element ( 16 ) has on its external periphery notches ( 15 ) directed radially outwardly and regularly spaced about said periphery, and that the movable jaw ( 4 ) has on its internal periphery at the level of its opening, lugs directed radially inwardly, regularly spaced about said periphery and in number equal to said notches ( 15 ), the lugs penetrating in the assembled condition into said notches so as to secure the blocking element ( 16 ) and the movable jaw ( 4 ) in rotation during operation of the crusher.