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Originally posted by Sauron
Sort of off topic (sorry) but elevator cars have a fail safe, a cable runs from the top of the car up to the penthouse and around a gin wheel and back down to the underside of the sling (what the car rides on). This gin wheel has 3 doglegs that will swing out and lock against 3 stop bars when the RPMs become to great, the other end of the cable is attached to the rail guides below the sling they have a retractable sets of teeth that grip the rail, so whee the car speed is to great the doglegs kick in the cable stops, the teeth engage and bring the car to a stop. Not to mention forcing the car down means your pulling the counter weights up.