A man cut the only rope holding him up, and didn’t fall. Most people think an elevator falls all the way down if its rope snaps. In 1854, Elisha Otis stood high above a crowd, under a bent wagon spring. When the axe cut the rope, the spring snapped flat and pushed two pawls into the rail teeth. But extra ropes aren’t the reason: without that spring, he’d have dropped onto the crowd. Instead he stopped after a few inches, and raised his hat. Today, if a car goes too fast, a spinning governor clamps steel wedges onto the rails.
– Sources: Smithsonian National Museum of American History / Otis history: at the 1853-54 New York Crystal Palace exhibition Elisha Otis rode an open hoisting platform, had its only rope cut, and the safety stopped it within inches.; ASME landmark / Otis patent US 31,128 (1861) ‘Improvement in Hoisting Apparatus’: a wagon spring on the platform top is held bent by the hoist rope; if the rope slackens the spring straightens and throws pawls into ratchet teeth on the guide posts.; Modern elevator codes (ASME A17.1 / EN 81-20): every traction elevator carries an overspeed governor that trips safety gear wedges gripping the guide rails; cars also hang on several independent steel ropes.
– 3D: All models procedural (film_kit part library + simple modelled sets and cartoon figures).
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