Patent ID: 8414054

Claim:
A tilt-mechanism-integrated suspension mechanism in which a tilt mechanism that adjustably tilts a seat section is incorporated consisting of: an upper frame portion on which the seat section is mounted; a lower frame portion mounted on a vehicle floor surface so as to oppose the upper frame portion; first and second supporting legs to support the lower frame portion and the upper frame portion on one side of the seat section; third and fourth supporting legs to support the lower frame portion and the upper frame portion on the other side of the seat section, and a shock absorbing means for absorbing the shock from the seat section, wherein one end of the first supporting leg and one end of the third supporting leg are pivotally connected to the upper frame portion on the same axial line, respectively, the other end of the first supporting leg and the other end of the third supporting leg are pivotally connected to the lower frame portion on the same axial line, respectively, the second and fourth supporting legs each includes a lower supporting leg portion of which one end is pivotally connected to the lower frame portion, an upper supporting leg portion of which one end is pivotally connected to the other end of the lower supporting leg portion and of which the other end of the upper supporting leg portion is engaged with the upper frame portion so as to be able to make a sliding movement, the second supporting leg further including a locking means for locking the upper supporting leg portion of the second supporting leg to the lower supporting leg portion of the second supporting leg, a lock-state maintaining means for maintaining the lock between the upper supporting leg portion of the second supporting leg and the lower supporting leg portion of the second supporting leg by resiliency, and a releasing means for releasing the lock against the resiliency force of the lock-state maintaining means, wherein the second supporting leg is pivotally connected to the first supporting leg by a pivot pin so that they intersect with each other, and the fourth supporting leg is pivotally connected to the third supporting leg by a pivot so that they intersect with each other.