Refining plate attached to a head in a pulp refiner

A refining member adapted for use in a refiner comprising a housing having a chamber, a material-admitting inlet and an outlet,

• two spaced apart coaxial refining members mounted in said chamber, with at least one refining meter rotatable relative to said other refining meter, and
• a path for the movement of material from maid inlet to said outlet, said two refining members including comminuting projections adjacent to said path to refine the material flowing along said path, said refining member being at least one of said two refining members and comprising
• a head having a front face and a rear face, said head front face having therein a plurality of head slots and said head rear face having therein a plurality of head slots, an outer circumferential edge, and a mounting hole spaced radially inwardly from said outer circumferential edge,
• a device outside of and attached to said head circumferential edge and extending beyond the head outer circumferential edge in the direction of axial rotation of the head, and
• a plurality of refiner plates, each of said refiner plates having an outer circumferential edge that abuts said device, a front surface having comminuting projections, and a plate rear surface, and a mounting opening radially inward from maid outer circumferential edge and aligned with said head mounting hole, said refiner plate including a radially extending key attached to said plate rear surface and received in a respective one of said plurality of head slots, said key having an end forming a tab that extends past said plate outer circumferential edge, said tab being held by said device, and a fastener extending through said plate mounting opening into said head mounting hole to removably secure said refining plate to said head.