Mounting System for a Headrest Retractable by Gravity, Assembly Comprising Such a Mounting System and Vehicle Seat Comprising Such an Assembly

A mounting system for at least one shaft, the shaft extending in a vertical direction, the mounting system comprising:

• a housing adapted to enclose the shaft with a radial clearance and
• a moving carriage capable of being moved between a blocking position and an unblocking position,
• at least a jaw movable between an immobilization position and a release position,
• the jaw being driven by the moving carriage to be in the immobilization position when the moving carriage is in the blocking position and in the release position when the moving carriage is in the unblocking position,
• the jaw being adapted to apply, when it is in the immobilization position, a clamping force to the shaft in a clamping direction perpendicular to the vertical direction, so that the shaft is supported on the housing,
• wherein the moving carriage comprises at least one drive slot in which a slug from the jaw is able to move.