Abstract: A roll belt conveyor having a shaft that supports, adjacent to both ends, the inner ring of a rolling bearing whose outer ring carries a cylindrical tube encompassing the shaft, there being provided a seal on the outside of each rolling bearing, the roll comprising a ring-shaped bearing housing that presents an external peripheral surface, encasable through elastic deformation, into a superficial internal recess of the cylindrical tube, so as to lock, radially and axially to this the ring-shaped bearing housing, and retaining the adjacent rolling bearing against radial and axial displacements, at least in the inward direction of the roll.

Abstract: A centrifugal thrower apparatus, which may be used on swivelloaders, swivelpilers, box car loaders, pilers, ship trimmers and the like, capable of maintaining a substantially constant belt tension over a wide range of angles of discharge. Preferably, a cam is provided to continually adjust the distance between the two sets of pulleys on which the belt is mounted, such that constant or substantially constant belt tension is maintained for different angles of discharge.