(Solved): The Figure shows two positions of a folding seat used in aisles of busses to ...

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The Figure shows two positions of a folding seat used in aisles of busses to accommodate extra seated passengers. Design a four-bar mechanism to support the seat so that it will lock in the open position and fold to a stable closing position along the side of the aisle. Note that in the closed position there can be no link inside the aisle and you cannot place a fixed pivot outside the bus!.