The crankshaft used to be patented. James Watt had to design around the obvious implementation when building his steam engines: https://en.wikipedia.org/wiki/Su

The crankshaft used to be patented. James Watt had to design around the obvious implementation when building his steam engines: https://en.wikipedia.org/wiki/Sun_and_planet_gear https://en.wikipedia.org/wiki/Sun_and_planet_gear