tcs

In Henry Sturmey's (yes, THAT Sturmey) 1887 Indispensable Bicyclist's Handbook, there is no mention of the attachment of the pedal to the crank. There are no competing standards or proprietary methods delineated. All the pedals pictured feature a flat-sided axle that fits through a rectangular slot in the crank and are held on with a nut on the backside. This seems to apply to pedals for ordinaries (penny-farthings) and safeties (chain-drive bikes).



There are some cranks that allow for various length adjustment.

Pompiere

And from what I remember of my visit to Greenfield Village, Orville was there to oversee the reconstruction of the shop. They also have Thomas Edison's Menlo Park lab. https://www.thehenryford.org/

Portlandjim

This link mentions the Wright Bro​thers pedal thread innovation:

https://www.wright-brothers.org/Info...t_Bicycles.htm

The relevant content here:

In 1900, the Wrights announced a "bicycle pedal that can't come unscrewed." Pedals were mounted to the crank by threaded spindles. On early bicycles, both crank arms had standard right-hand threads. As the cyclist pedaled, the action tended to tighten one pedal and loosen the other, with the result that one pedal kept dropping off the bike. British inventor William Kemp Starley had solved a similar problem years before when the right-hand cups that housed the crank or "bottom" bearing on early bicycles kept coming loose. He simply reversed the thread direction on the right cup so the pedaling action kept it tight. It wasn't long before bicycle makers realized the same solution could keep the pedals in place. Wilbur and Orville were in the vanguard of those manufacturers that offered right-hand threads on one crank arm and left-hand threads on the other.

Wright Brothers bicycles are very rare, this one was next to the Wright Flyer in the Smithsonian Washington DC.