Patent ID: 7909717

Claim:
A tensioning roller device or winder comprising: a non-rotating central journal part provided with a threaded radial through hole enabling the journal part to be mounted on a radial support element; a pulley-forming part rotatably mounted around the journal part by means of a bearing, and adapted to support a belt on its outer circumference; and a protective cap comprising a central circular part covering an axial end of the central journal part, and a circumferential shield part extending radially further than the journal part, up to the pulley-forming part, so as to define a narrow passage and/or a chicane between the pulley-forming part and the cap, thus inhibiting ingress of polluting elements into the bearing, the protective cap comprising means for axial fastening to the axial end of the central journal part, and means for angular, non-rotative fastening to the journal part, so that that the whole device can be handled, and the central part can be angularly oriented around its axis, so as to be mounted onto the radial support element, by means of holding only the cap, wherein the means for non-rotative fastening comprises an axial peg, the axial peg extending from the central circular part and co-operating along a surface generated only by axial lines parallel to the rotation axis of the pulley-forming part, with an axial hole formed into an end surface, perpendicular to the axis of rotation of the pulley, of the central journal part.