BRUSH ROLL AND ITS BRUSH DEVICE

Disclosed are a brush roll and brush elements thereof which are useful for grinding, polishing cleaning or otherwise treating steel sheets, plates or strips. The brush roll and the brush element have in common the following feature. A brush element U comprises an assembly of annular disks 2 joined together as arranged side by side in the direction of width thereof and each having polishing bristles or cleaning yarns 1 implanted in an outer periphery thereof to provide an assembly of such brush elements U as fitted around a shaft 3 and arranged side by side longitudinally of the shaft 3, the brush element U being engageable with the shaft 3 by keyways 5 formed in both a peripheral surface of the shaft 3 and an inner peripheral surface of the brush element U and equidistantly spaced apart circumferentially of the peripheral surfaces and by sunk keys 4 fitting in the respective keyways 5, the sunk keys 4 and the keyways 5 being each so profiled in cross section that the sunk key 4 is prevented from slipping out of the keyway 5a in the brush element U radially of the brush element U, the sunk keys 4 having a length not larger than the length of the brush element U, each of the sunk keys 4 being expandable or contractable widthwise thereof and tightly engageable in the keyway 5 when expanded and disengageable therefrom when contracted, the sunk key 4 being prevented from slipping out of the keyway 5 in the brush element U longitudinally of the keyway by retaining means C when fitted as contracted in the keyway 5.