Abstract: An angle adjustment device is disclosed in which the angle of inclination of a headrest or thigh support can be adjusted by rotating a movable body itself forming a part of the headrest or thigh support. When the movable body is rotated, sectors fixed to the movable body are rotated together with the movable body and are engaged with a stopper rod secured to a bracket. Thus, the sectors are locked in a desired position, that is, the angle of the movable body is adjusted. When the movable body is rotated beyond a predetermined angle of rotation, the sectors are disengaged out of the stopper rod and the movable body is rotated in an opposite direction so as to return to its initial position.

Abstract: A lumbar support device which is included in a lower half section of a seat back and is capable of adjusting the supporting pressure of the lower half section of the seat back. The lumbar support device comprises a control/operation mechanism for adjusting said supporting pressure, an operation mechanism for the control/operation mechanism and a flexible wire connecting both mechanism with each other, whereby the control/operation mechanism can be remotely controlled. Also, the operation mechanism can be installed in a position which is easiest for an occupant to operate.

Abstract: A seat frame for use in a vehicle seat which is formed by connecting two side frames to front and rear frames and is provided with two link mechanisms rotatably mounted between the respective inside surfaces of said two side frames and slide rails or a vehicle floor.