Patent ID: 6863166

Claim:
Clutch mechanism of the type generally disposed in a casing ( 1 , 2 ) and constituted by a toothed wheel ( 3 ) driven by an endless screw ( 12 ), this wheel ( 3 ) being securable to a driven shaft ( 15 ) by means of two friction cones ( 5 ) disposed coaxially to the axial bore of the toothed wheel ( 3 ), and coacting, under the action of a control device ( 7 , 13 ), with conical contact areas on the wheel ( 3 ), characterized in that the toothed wheel ( 3 ) is made of a synthetic material, the bore of this toothed wheel ( 3 ) having an annular partition ( 16 ) delimiting on each side a shouldered recess for the reception of a metallic ring ( 4 ), secured in rotation with said wheel ( 3 ), this ring ( 4 ) comprising internally a conical contact area ( 4 A) adapted to coact with the metallic friction cone ( 5 ).