| 摘要 |
A tilt-integrated suspension mechanism which is simplified in apparatus configuration is provided. The mechanism includes first and second supporting legs 15a, 15b to support an upper frame 12 and a lower frame 13 on the side of one of the side surfaces of a seat section, third and fourth supporting legs 15c, 15d to support the lower frame 13 and the upper frame 12 on the side of the other side surface of the seat section, and a shock absorber, and characterized in that the first and third supporting legs 15a, 15c are pivotably connected to the upper frame 12 on the same axial line, the second and fourth supporting legs 15b, 15d each include a lower supporting leg portion to be pivotally connected to the lower frame 13, upper supporting leg portion pivotally connected to the lower supporting leg portion by a pivot pin and joined to the upper frame 12 so as to be able to make a sliding movement, a locking means for locking the upper supporting leg portion to the lower supporting leg portion, a locked-state maintaining means for maintaining the lock between the upper supporting leg portion and the lower supporting leg portion by resiliency force and a releasing means for releasing the lock against the resiliency force of the lock-state maintaining means.
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