Patent ID: 7188792
Filing Date: 2007-03-13
Classification: D21D

Abstract:
1. A refiner for pulp or like materials, comprising a housing having a chamber, a material-admitting inlet and an outlet; spaced apart first and second refining members mounted in said chamber; a rotary third refining member disposed in said chamber between said first and second refining members, said third refining member having a central opening and wherein said third refining member does not have cross flow ports, said refining members being coaxial with each other, a first path for the movement of material from the inlet is defined between the first and third refining members, a second path for the movement of material to the outlet is defined between the second and third refining members, said first and second refining members respectively having first and second comminuting projections adjacent to said first and second path and said third refining member having third and fourth comminuting projections adjacent to said first and second path and respectively cooperating with said first and second projections to refine the material flowing along said first and second paths, means for rotating said third refining member and comprising a shaft extending through a central opening provided in said first refining member, a hub rigid with said shaft and having a center, said hub being received in said third refining member central opening so that said third refining member is movable axially of said hub, and said hub having at least one port in said hub from said first path to said second path and between said third refining member central opening and said center of said hub, and means for transmitting torque from said hub to said third refining member, said torque transmitting means comprising said hub having a splined exterior, and said third refining member central opening having splines that engage said hub splined exterior.