VEHICLE SEAT ADJUSTOR

PURPOSE:To enhance controllability by making a hardness adjustor and a height adjustor independent of each other, thus eliminating the need for repeating control of height and hardness which has conventionally been inevitable when adjusting height and hardness. CONSTITUTION:A quadric parallel link mechanism comprises links 1, 2 and 3, 4 freely rotatably connected to one another at their endpoints 9, 10, 11, 12. A rotor 5 is provided in such a manner that it freely rotates about the endpoint 12 of the link 2 held in position and can be secured to the link 2 at an angle of rotation. A spring 6 is provided between the rotor 5 and the link 4 in the direction of expansion, and torque for clockwise rotation about a center 12 of rotation is imparted to the link 4, and the link 1 tends to move upwards The rotor 5 is provided with a stopper 7 that stops the link 4 from rotating, and the link 1 is at rest in a certain position.