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A "crosse" is usually a bar that bends back on itself like a bishop's crosier or a shepherd's crook (hence the name). The top of a pool ladder is a "crosse", for instance, and you see the same at the top of ladders on building walls where they reach the roof (where they give purchase "inboard" of the wall and are also a safety feature - no projecting piece to fall on).
I can well imagine that the side members of the seat back would be curved over in such a way at the top in order to provide a larger impact area for rear-passenger skulls to collide with, or quite simply to reduce the risk of puncturing the upholstery as a result of normal wear and tear.
But why an essential part of a car seat - if my imagined scenario is right - would be a loss maker defeats me ...
xxxBourth Local time: 08:56 Native speaker of: English PRO pts in category: 673