Abstract: The vehicle seat comprising a seat-bottom frame; a seatback frame comprising at least one first lateral riser mounted pivoting relative to said seat-bottom frame around a transverse axis; a first discontinuous type hinge mechanism with a first side-plate rigidly fixed to the seat-bottom frame and a second side-plate; an intermediate riser mounted on the seat bottom frame, pivoting around the transverse axis, by means of the first hinge mechanism where the intermediate riser and the second side-plate are securely connected in rotation around the transverse axis; where the intermediate riser is fixed to the first lateral riser at a distance from the transverse axis; where the intermediate riser has a stiffness less than the stiffness of the first lateral riser of the seatback frame.

Abstract: The vehicle seat comprising a seat-bottom frame; a seatback frame comprising at least one first lateral riser mounted pivoting relative to said seat-bottom frame around a transverse axis; a first discontinuous type hinge mechanism with a first side-plate rigidly fixed to the seat-bottom frame and a second side-plate; an intermediate riser mounted on the seat bottom frame, pivoting around the transverse axis, by means of the first hinge mechanism where the intermediate riser and the second side-plate are securely connected in rotation around the transverse axis; where the intermediate riser is fixed to the first lateral riser at a distance from the transverse axis; where the intermediate riser has a stiffness less than the stiffness of the first lateral riser of the seatback frame.

Abstract: A hinge mechanism for a motor vehicle seat allowing angular adjustment of a backrest relative to a seating portion. The hinge mechanism includes first and second hinge plates, a control member moving locking elements and biased to a locking position by first springs, and a drive shaft biased to a first rest position by second springs. The second springs are housed between the first and second hinge plates and are supported on the first plate.

Abstract: A hinge mechanism for a vehicle seat, allowing adjustment of the tilt of a seat backrest relative to a seat cushion. The hinge mechanism has two plates, the first plate containing base gear teeth on an edge directed inward, a set of first elements cooperating with a first control cam biased by first springs, a set of second elements cooperating with a second control cam biased by second springs, and a control hub for moving the control cams toward an unlocking position against the biasing of the first and second springs. The set of first elements have teeth offset angularly by at most a half-tooth relative to teeth of the set of second elements, thereby obtaining a small locking pitch.

Abstract: A hinge mechanism for a vehicle seat, allowing adjustment of the tilt of a seat backrest relative to a seat cushion. The hinge mechanism has two plates, the first plate containing base gear teeth on an edge directed inward, a set of first elements cooperating with a first control cam biased by first springs, a set of second elements cooperating with a second control cam biased by second springs, and a control hub for moving the control cams toward an unlocking position against the biasing of the first and second springs. The set of first elements have teeth offset angularly by at most a half-tooth relative to teeth of the set of second elements, thereby obtaining a small locking pitch.

Abstract: A hinge of an automotive vehicle seat for adjusting the angle of a seat back relative to a seat bottom about a hinge axis, comprising first and second plates, a control device adapted to move locking elements which immobilize the first plate relative to the second plate, a control shaft adapted to cause said control device to rotate on the axis, wherein the control shaft is held in the direction of the main axis by a snap-in means, such that the control shaft can be assembled manually without tools.

Abstract: A hinge mechanism for a motor vehicle seat allowing angular adjustment of a backrest relative to a seating portion. The hinge mechanism includes first and second hinge plates, a control member moving locking elements and biased to a locking position by first springs, and a drive shaft biased to a first rest position by second springs. The second springs are housed between the first and second hinge plates and are supported on the first plate.

Abstract: A hinge of an automotive vehicle seat for adjusting the angle of a seat back relative to a seat bottom about a hinge axis, comprising first and second plates, a control device adapted to move locking elements which immobilize the first plate relative to the second plate, a control shaft adapted to cause said control device to rotate on the axis, wherein the control shaft is held in the direction of the main axis by a snap-in means, such that the control shaft can be assembled manually without tools.