Abstract: A method for making a frustro-conical ring collar by providing a metal band, helically winding the band, cutting off a length of the band which corresponds to one lead of the helix, axially acting on the two ends of the band length to place them in facing positions, welding together the aligned ends to form a cylindrical ring, an conferring a frustro-conical shape to the ring.

Abstract: The invention concerns a clutch mechanism for friction clutch, in particular for motor vehicles, comprising a cover (8) with a transversely oriented base (80) and means (81) for fixing the clutch mechanism on a rotating flywheel (1), a pressure plate (3), elastic tabs linking in rotation, with axial mobility, the pressure plate (3) in rotation with the cover (8), axially operating elastic clutching means (7) axially stressing the pressure plate (8) in the opposite direction from the cover (8) base (80) and a disengaging device countering at will the action of said elastic clutching means (7): said elastic clutching means (7) are associated with two elastic washers (4, 6) mounted between the pressure plate (3) and the cover (8), and adapted to act on the pressure plate (3) parallel relative to the elastic clutching means (7) in a direction disengaging the clutch.

Abstract: A friction clutch comprises a first part and a second part. The first part comprises two carrier plates coupled together at a fixed axial spacing by means of spacers. The second part includes a damper plate disposed axially between the two carrier plates. The first part further includes a first friction disc and a second friction disc, of which at least the first includes a support plate which is mounted so as to be axially movable with respect to one of the carrier plates, by virtue of openings formed in the support plate with the spacers passing through these openings. A coupling device is provided, coupling the support plate to the carrier plate with respect to which it is axially movable. The support plate is disposed axially between the two carrier plates. The invention is applicable to sports cars.

Abstract: A torsional damper device suitable for automobile vehicles comprises a driving part, an intermediate part and a driven part disposed coaxially and rotatable relative to each other within predetermined limits of relative angular displacement. Lost motion meshing teeth between the driving, intermediate and driven parts are adapted to determine these predetermined limits of relative angular displacement. First and second circumferentially acting spring units between the driving, intermediate and driven parts oppose relative angular displacement of these parts for at least two ranges of relative angular displacement. Lost motion meshing teeth between the driving, intermediate and driven parts define these two ranges of relative angular displacement. A first plurality of elements in the driving part include a friction disk and at least a disk to support and center it.

Abstract: A torsional damper device comprises coaxial parts adapted to rotate relative to one another within predetermined limits. Two of the coaxial parts mesh together with clearance, the meshing portions defining predetermined limits of relative angular movement. A circumferentially acting elastic element is disposed between these two coaxial parts to resist such relative angular movement. A centering device cooperating with the meshing portions is adapted to urge the two coaxial parts circumferentially towards a rest position between the predetermined limits of relative angular movement. These two coaxial parts are formed with shoulders and the centering device comprise at least one elastic member, constituting part of the circumferentially acting elastic element, colocated with the meshing portions. A respective bearing member is disposed between each end of the elastic member and the associated shoulder. Thus the elastic member bears on the shoulders through the intermediary of the bearing members.