Invention Out of Debt

Walter Hunt owed a man $15. It was 1849, and $15 was real money. Hunt was an inventor with a reputation for brilliance and terrible business sense. He'd invented a sewing machine before Elias Howe but never patented it. He'd designed a repeating rifle before Winchester. Ideas came constantly. Money didn't.

The man he owed told him to invent something and sign over the rights in exchange for clearing the debt plus $400. Hunt sat down with a piece of brass wire and started twisting. Three hours later, he had the safety pin — a single piece of wire, coiled at one end for a spring, with a clasp at the other to shield the sharp point. He filed for a patent on April 10, 1849, and sold the rights. He got his $400. The buyer made millions.

Hunt's design wasn't the first pin, but it was the first safe one. Straight pins had been used for thousands of years, but they stabbed you, came loose, fell out. The Romans had fibulae, but those were complex and expensive. Hunt's design was cheap, reliable, and impossible to stab yourself with. It solved a problem that had existed for millennia.

the modern safety pin: a single bent wire with a coil spring at one end and a protective clasp at the other. hunt's design from 1849 remains essentially unchanged. source: wikimedia commons

Hunt never benefited. He sold the patent outright, a pattern he repeated his whole life. He invented a paper collar, a street-sweeping machine, an ice plow, a knife sharpener, a nail-making machine. Most were commercially successful. None made him rich. He died in 1859, largely forgotten.

The safety pin exists because a man needed $15 and happened to be the kind of person who could twist a wire into a solution in three hours. That kind of brain doesn't turn off. Hunt kept inventing until he died, leaving behind objects the world uses every day, none of which bear his name.