Patent ID: 7028800

Claim:
A seat attachment structure mounted on a vehicle body comprising: a storage box openable and closable by a seat which is elongated in the fore-and-aft direction; a hinge attached to the seat for freely opening and closing the storage box; a plurality of seat hooks attached on a lower surface of the seat; a main locking mechanism and a sub-locking mechanism attached on the vehicle body for being engaged respectively with the seat hooks, so that the seat is locked by the main and sub-locking mechanisms, wherein the hinge connecting one end of the seat and to a point substantially at a center of a curved member bridging between right and left frame members of the vehicle body, the seat hook for the main locking mechanism is attached at an opposite end of the seat, the seat hook for the sub-locking mechanism is attached substantially at a center of the seat, and the main locking mechanism and the sub-locking mechanism are connected by a connecting member, so that when the main locking mechanism is locked by a downward pressing force for closing the seat, the sub-locking mechanism is also brought into the locked state in conjunction with said connecting member operated by said downward pressing force for closing the seat, wherein the main locking mechanism comprises: a housing formed with a U-shaped groove; a locking claw rotatably mounted on the housing via a pin; a stopper member rotatably mounted on the housing via a pin for holding the locking claw at the locking position; and a tension coil spring laid between the locking claw and the stopper member for pulling the locking claw to the unlocking direction and pulling the stopper member counterclockwise.