Adjustment mechanism for vehicle seat

An adjustment mechanism for a vehicle seat comprising:

• a support including an annular inner surface, centered on a main axis of rotation,
• a control stage including a driving member mounted to pivot relative to the support about the main axis of rotation,
• an output member mounted to pivot substantially about said main axis of rotation and including an outer surface,
• at least one first rolling bearing member interposed respectively in a first wedge-shaped area formed between the outer surface and the annular inner surface, so that the first rolling bearing member is designed to guide the output member in rotation about the main axis of rotation and to block the rotation of the output member relative to the support in a first direction of rotation,
• at least one second rolling bearing member interposed respectively in a second wedge-shaped area formed between the outer surface and the annular inner surface and oriented opposite the first wedge-shaped area, so that the second rolling bearing member is designed to guide the output member in rotation about the main axis of rotation and to block the rotation of the output member relative to the support in a second direction of rotation,
• the driving member comprising driving fingers designed to push the first and second rolling bearing members,
• wherein the outer surface includes driving portions positioned circumferentially symmetrically to the wedge-shaped areas relative to the first and second rolling bearing members, said driving portions being designed to be pushed by said first and second rolling bearing members respectively in the second and first directions of rotation,
• and wherein the outer surface does not have direct contact with the annular inner surface.