Patent ID: 7806482

Claim:
A drop-in seat unit comprising: a two frame rail drop-in seat unit frame comprising a first frame rail and a second frame rail, wherein the first frame rail and the second frame rail are spaced-apart, each of the first frame rail and the second frame rail comprising a vertically extending portion and a horizontally extending portion, the horizontally extending portions of the first frame rail and the second frame rail extending toward each other, each of the vertically extending portions defining a plurality of apertures; a plurality of first hooks fixed to the first frame rail and a plurality of second hooks fixed to the second frame rail, wherein each hook comprises a straight hook end, a hook body, and a hook receiving slot, and wherein the straight hook end extends into one of the apertures defined in the vertically extending portion of one of the frame rails and has been bent such that each hook is locked onto the frame rail; a plurality of springs, each having a first end attached to one of the first hooks and a second end attached to one of the second hooks; and a plurality of support members extending between the first frame rail and the second frame rail.