Patent ID: 8414055

Claim:
A seat to be mounted in a vehicle, comprising: a seat cushion frame including a first frame member and a second frame member; a drive pinion rotatably supported in said first frame member of said seat cushion frame, said drive pinion being operatively connected with a drive source provided with the seat; a first link element having: an upper portion pivotally connected with said first frame member of said seat cushion frame; and a lower portion pivotally connected with a floor of said vehicle, wherein said upper portion has, defined therein, a first sector gear portion which is in meshed engagement with said drive pinion; said first link element including a hole and a second gear portion; a second link element having: an upper portion pivotally connected with said second frame member of said seat cushion frame; and a lower portion pivotally connected with said floor of said vehicle; said second link element including a hole and a third gear portion; a connecting axis element rotatably extended between said first and second frame members of said seat cushion frame; said first and second link elements being coupled together by said connecting axis element for synchronized movement; a reinforcing transmission shaft having one end portion and another end portion, said reinforcing transmission shaft extending in a parallel relation with said connecting axis element, such that said end portion thereof extends through said hole of said first link element and is rotatably connected with said first frame member of said seat cushion frame, whereas said another end portion thereof extends through said hole of said second link element and is rotatably connected with said second frame member of said seat cushion frame; a first pinion fixed to said one end portion of said reinforcing transmission shaft, said first pinion being in meshed engagement with said second gear portion of said first link element; and a second pinion fixed to said another end portion of said reinforcing transmission shaft, said second pinion being in meshed engagement with said third gear portion of said second link element.