Patent ID: 8033491

Claim:
A gyratory crusher comprising: a bowl ( 14 ) shaped as a cone with its wider opening approaching the top of the crusher; a head assembly ( 16 ) shaped as a cone, centrally located within the bowl and having its larger diameter at the lower end of the bowl, so that the bowl and head assembly form a crushing volume ( 18 ) which is larger at the top and smaller at the lower end, with the head assembly including a central mainshaft ( 34 ) which is located on an inclined axis within the bowl; a spider ( 36 ) located at the top of the crusher functioning as the upper support member of the crusher and including bushings or bearings within which an upper portion of the mainshaft is captured; a cylindrical eccentric assembly ( 28 ) including an eccentric central volume in which the main shaft is held so that, as the eccentric assembly rotates, the mainshaft gyrates, with the eccentric assembly rotating about a center hole ( 31 ) within a central hub ( 30 ) of the crusher, said eccentric assembly being sized to be removable from above the crusher after spider ( 36 ) and head assembly ( 16 ) have been removed from above; a ring gear ( 24 ) attached to and rotating the eccentric assembly with the ring gear driven by a drive gear ( 27 ) and a drive shaft ( 26 ); a hydraulic support assembly ( 49 ) comprising a piston assembly 46 installed within a cylindrical support 38 , said hydraulic support assembly installed below and supporting the head assembly ( 16 ) and cylindrical eccentric assembly ( 28 ), with the cylindrical support supported by a support frame ledge ( 52 ) protruding inward from the structure of the crusher, and with the cylindrical support being sized to be able to clearly pass upward through center hole ( 31 ) to thereby be removable from above the crusher after the eccentric assembly is removed.