Impellers for comminutors

Claim 1

IN AN IMPELLER FOR COMMINUTORS AND THE LIKE, IN COMBINATION, A ROTARY IMPELLER BODY BEING FORMED WITH A PLURALITY OF ELONGATED OPENINGS EXTENDING IN SUBSTANTIALLY RADIAL DIRECTION FROM THE PERIPHERY OF SAID BODY TOWARD THE AXIS OF ROTATIONS THEREOF AND BEING DISTRIBUTED ABOUT SAID AXIS, SAID BODY HAVING AT EACH OPENING AN ELONGATED TRAILING PORTION EXTENDING PARALLEL TO SAID AXIS AND FORMING A FIRST ABUTMENT SURFACE TRANSVERSE TO THE ELONGATED OF SAID OPENING AND HAVING AN ELONGATED LEADING PORTION LOCATED AHEAD OF SAID TRAILING PORTION IN THE DIRECTION OF ROTATION OF SAID BODY AND FORMING A SECOND ABUTMENT SURFACE EXTENDING SUBSTANTIALLY IN AXIAL DIRECTION AND BEING LOCATED NEARER TO SAID AXIS THAN SAID FIRST ABUTMENT SURFACE; AND A PLURALITY OF ELONGATED COMMINUTING BARS PROJECTING WITH FREE END PORTIONS THEREOF RADIALLY BEYOND SAID OUTER PERIPHERY OF SAID BODY AND HAVING EACH AN INNER PORTION LOCATED WITH CLEARANCE IN SAID OPENINGS, RESPECTIVELY, EACH BAR HAVING A TRAILING RIB LOCATED RADIALLY INWARDLY OF SAID FIRST ABUTMENT SURFACE AND URGED, DURING ROTATION OF SAID BODY, BY CENTRIFUGAL FORCE OUTWARDLY INTO ENGAGEMENT WITH SAID FIRST ABUTMENT SURAFACE, THE ENGAGEMENT OF SAID RIB WITH SAID ABUTMENT SURFACE TENDING TO TURN EACH BAR IN A DIRECTION WHICH MAINTAINS SAID BAR PRESSED AGAINST SAID SECOND ABUTMENT SURFACE, WHEREBY SAID BARS ARE MAINTAINED BY CENTRIFUGAL FORCE IN PREDETERMINED POSITIONS WITH RESPECT TO SAID IMPELLER BODY WHICH WILL NOT BE CHANGED UNDER THE IMPACT OF THE MATERIAL TO BE COMMINUTED UNTO SAID FREE END PORTIONS OF SAID BARS WHILE AT THE SAME TIME SAID BARS CAN BE EASILY REMOVED IN DIRECTION OF SAID AXIS FROM SAID OPENINGS WHEN SAID IMPELLER BODY DOES NOT ROTATE.