Abstract: A pulley device for a belt or chain, the pulley device comprising a bearing provided with an external ring, an internal ring, and at least one row of rolling elements mounted in a bearing chamber defined between the external and internal rings. A pulley is secured in rotation with the external ring and provided with an external radial surface for engaging with a belt or chain. Also included is at least one hollow shaft able to receive a screw for mounting the pulley device on a support. The hollow shaft forming a structural unit comprising a bushing, a flange secured to the bushing, and which extends, from the bushing, radially outwards, respective to a central axis of the hollow shaft, as far as the bearing chamber. The flange is formed with a washer and an endplate, while the washer is radially located between the bushing and the endplate.

Abstract: The channel cleaning brush comprises a flexible core (10) on which at least one brush (15) is mounted, which is formed by a shaft (20) and a cleaning coil disposed on the shaft, which comprises fins (21) regularly disposed on the shaft (20). The brushes are over-moulded on the core.