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Interesting concept! But the furniture looks terribly sterile.
DocJackson writes in his comment "why is it necessary that the safety device must destroy itself"
I suspect that the momentum of the spinning blade being "grabbed" by the brake, is in great part responsible for the speed with which the blade drops down below the table surface.
Since the brake can not move up it has to be the blade that must go down. Remember on the back of the spinning blade the teeth move up and if my calculations are correct they do that at a speed of approx. 2000" per second or 2" per milisecond.
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