Vehicle seat

A vehicle seat configured to accommodate at least two users, the vehicle seat comprising a transverse axis and a vertical direction, the vehicle seat comprising:

• a seating portion frame, intended for being connected to the floor of a vehicle,
• a first backrest which is pivotally hinged to the seating portion frame according to the transverse axis of the vehicle seat, and the first backrest comprising a first wall,
• a second backrest which is pivotally hinged to the seating portion frame according to the transverse axis of the vehicle seat, adjacent to the first backrest, and the second backrest comprising a second wall, wherein the first backrest and the second backrest are connected to the seating portion frame via a common hinge, positioned in an intermediate zone of the seating portion frame, in the transversal direction of the vehicle seat, wherein said common hinge includes:
• a pivot pin of an axis coincident with the transverse axis of the vehicle seat, comprising a central portion, a first lateral portion and a second lateral portion, the two lateral portions being positioned on either side of the central portion according to the axis of the pivot pin,
• a first housing arranged on the first wall of the first backrest and receiving interiorly the first lateral portion of the pivot pin, by authorizing the rotation of the first backrest relative to the pivot pin about the axis of said pivot pin,
• a second housing arranged on the second wall of the second backrest and receiving interiorly the second lateral portion of the pivot pin, by authorizing the rotation of the second backrest relative to the pivot pin about the axis of said pivot pin,
• a third housing, arranged on the seating portion frame, and receiving interiorly the central portion of the pivot pin, the central portion being maintained immobile in the third housing and so that the pivot pin is maintained immobile relative to the seating portion frame,
• wherein the first lateral portion has a rib protruding in a radial direction from the pivot pin and extending opposite the axis of the pivot pin, and
• wherein the first housing has a substantially keyhole shape, complementary with the radial section of the first lateral portion of the pivot pin and of the rib, with a circular portion of centre and a substantially rectangular portion communicating together, the substantially rectangular portion being positioned above the circular portion of the first housing, in the vertical direction of the vehicle seat, when the first backrest is in a raised position, oriented substantially in the vertical direction of the vehicle seat,
• wherein said first housing and said first lateral portion of the pivot pin are configured so that:
• in a first position of the first backrest, relative to the pivot pin about the axis of the pivot pin, the first lateral portion and the rib are able to slide through the first housing according to the axis of the pivot pin, and
• in at least one second position of the first backrest relative to the pivot pin about the axis of the pivot pin, the sliding of the first lateral portion and the rib through the first housing according to the axis of the pivot pin, is prevented, the rib being, at least partially, facing the first wall in the vicinity of the first housing, in the direction of the axis of the pivot pin,
• wherein the rib is oriented, from the bottom upwards in the clockwise direction, according to an angle comprised between 30° and 60° relative to the vertical direction of the vehicle seat about the axis of the pivot pin.