Hi guys, I have a dilemma that I hope someone can help me with. I would like to construct a non-personnel elevator trapdoor. e.g. something that is flush with the floor in the "closed" position and has a plug so the "open" position is safe as well. Total vertical distance is approx 2 feet.
The purpose is to raise a bench from beneath the stage to on stage - without someone on a rope to either hoist the bench up or down. The plug also needs to be secured with positive latches or something to secure it incase somebody steps on it / sits on the bench.
I was toying with the idea of a closed pulley system that uses different mechanical advantages to lift and lower the bench with the same counterweight... but I'm not sure if that is the most elegant solution (or even possible). I would prefer not to use any electronics. My current "base design" is the elevator trapdoor on metalworking.com
Whattya think? Can you help me?