Patent ID: 8061643

Claim:
A refiner assembly comprising: a rotor comprising a rotor disk having a mounting surface; a refiner plate segment having a first surface for refining lignocellulosic material and an opposite surface facing the rotor disk; a rotor carrier plate sandwiched between the rotor disk and the rotor plate segment; and a fastener including a shaft extending between the refiner plate segment and rotor disk and through the rotor carrier plate, wherein a first end of the shaft is fixed to the refiner plate segment and a second end of the shaft is fixed to the rotor disk, and an annular securing device is coaxial with and secured to the shaft, wherein the annular securing device abuts against the rotor carrier plate to clamp the rotor carrier plate to the refiner plate segment while the annular securing device is secured to the shaft, wherein the annular securing device has a surface abutting the rotor carrier plate and which faces towards the refiner plate segment.