Patent ID: 8240763

Claim:
A vehicle including a seat on which an occupant sits and a seat back for supporting a back of the occupant, the seat back being internally provided with a lumbar support mechanism capable of adjusting a support position, the lumbar support mechanism comprising: a damper having one end supported by an inside of the seat back and the other end capable of extension and contraction; a pair of left and right seesaw links, each one of the seesaw links having one end connected to one end of the other seesaw link, each of said pair of left and right seesaw links being capable of rotating with an extension and contraction force of the damper, an intermediate portion supported at a swing fulcrum by the inside of the seat back, and the other end extending in a width direction of the seat back and swinging around the swing fulcrum; a pair of X-shaped pantograph links connected to the corresponding seesaw links and being movable up and down in a back and forth direction in conjunction with the swing of the seesaw links; and a lock-release lever adapted to release a lock mechanism of the damper; wherein in a stage of adjusting the support position, the lock-release lever is operated to release the lock mechanism of the damper, the extension and contraction force of the damper is transmitted to the pantograph links via the corresponding seesaw links, and the pantograph links shift a pad provided in the seat back in a back and forth direction.