Impactor with a pivotable grinding face

An impactor comprising a housing (1) including a pivotally mounted rear housing wall (5) and provided with a material feed inlet;

• a rotor (2) rotatably mounted in the housing (1) about a rotor axis (27);
• impact aprons (3) and a grinding face (4) positioned adjacent the rotor (2), the grinding face (4) being arranged underneath the impact aprons (3) on a side of the housing (1) opposite to the material feed inlet and at least partially extending underneath the rotor (2);
• a base member (15) mounted in the housing and to which the grinding face (4) is movably connected;
• means for pivoting said rear housing wall (5) outwardly on a pivot element (6) at a lower end of the rear housing wall (5);
• a first linking means (11) for pivotally connecting the grinding face (4) to the rear housing wall (5), said first linking means being pivotally connected to the rear housing wall (5) at a pivot point (18) on the rear housing wall (5) located above said pivot element (6) and a second linking means (12) for pivotally connecting the grinding face (4) to the rear housing wall (5), said second linking means (12) being pivotally connected to the rear housing wall (5) at a pivot point (19) on the rear housing wall (5) positioned further from the pivot axis (6) than the pivot point (18) for the first linking means (11), so that, as a result of a pivoting movement of the rear housing wall (5) from a closed position to an open position, the grinding face (4) pivots away from the rotor (2) and into a more nearly horizontal position.