US Patent 7909717 Tensioning roller device or winder

Tensioning roller device including a non-rotating central part around which is rotatably mounted a pulley-forming rotating part, and a protective cap mounted on one end of the central part and extending radially outwards so as to form a narrow passage and/or a baffle with the rotating part, the cap including means for axial fastening to the non-rotating central part and means for angular fastening to the non-rotating central part.