| 摘要 |
A vehicle seat assembly including a seat backrest, a seat bottom, and a seat frame having a front member and a rear member. The seat frame operatively supports the seat bottom and further has at least one backrest rotating mechanism that is adapted to allow said seat backrest to move between an upright position and a folded position. The seat frame further has a first pair of linkage attachment points on the front member to allow the rear member of the seat frame to be rotatively lifted upward and forward and move the seat frame from a seating position to a tumbled position. A tumble mechanism has a first and a second linkage arm, and a base plate that is fixedly mounted to the vehicle floor and is operatively disposed between the front member of the seat frame and the vehicle floor. The first and second linkage arms are operatively and pivotably mounted to the front member of the seat frame and are pivotably mounted to the base plate. The first and second linkage arms are of different lengths such that the first and second linkage arms provide two unequal length lever arms, which work cooperatively to cause the front member of the seat assembly to move rearward in an arcuate path as the rear member is lifted.
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