Seat cushioning member support mechanism and seat structure

A seat cushioning member support mechanism which elastically supports a cushioning member of a seat cushion part, the seat cushioning member support mechanism comprising:

• a first spring-damping mechanism to which an external vibration or impact as a trigger is input;
• and
• a second spring-damping mechanism which exhibits a spring-damping characteristic according to a displacement of the first spring-damping mechanism by the trigger inputted to the first spring-damping mechanism,
• wherein the first spring-damping mechanism and the second spring-damping mechanism are arranged in a stack direction and connected to each other via a link, and the first spring-damping mechanism and the second spring-damping mechanism are provided in a series positional relation;
• wherein the seat cushion part has a front torsion bar and a rear torsion bar arranged at a predetermined interval from each other in a front and rear direction of a seat and extending along a width direction of the seat by being disposed to extend between a pair of side frames of the seat cushion coupled to upper rails of slide adjusters, and the link comprises:
• a front link whose middle portion is coupled to the front torsion bar and whose upper portion and lower portion are rotatable in the front and rear direction about the front torsion bar;
• and a rear link whose middle portion is coupled to the rear torsion bar and whose upper portion and lower portion are rotatable in the front and rear direction about the rear torsion bar,
• wherein the first spring-damping mechanism is constituted by the front torsion bar, the rear torsion bar, and the cushioning member disposed to extend between the upper portions of the front link and the rear link, and
• wherein the second spring-damping mechanism is constituted by a lower portion connecting mechanism including at least one of a damping member and an elastic member disposed to extend between the lower portions of the front link and the rear link.