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The control problem is definately something to consider. And I am thinking of failure mechanisms. How about this... Four tubes, attacked to the platform, (sched. 40 pvc?)with tubes inside of them acting as rams and gasketed, letting air out of a relief hole at a set pace, acting as pneumatic resevours, like those on a hatch back lid of a car.
Here's the biggest thing. A fail safe should not be a wear item. It's something that never is used until it's needed.
The way a real elevator fail safe works is when the cable releases for any reason, it engages.
Your tubes to work effectively would be 3 stories tall by the way. ABOVE or BELOW the elevator.
Clay
PS. check this out: http://science.howstuffworks.com/elevator7.htm
Last edited by frijoli; 02/11/2009 7:16 AM.
