On this day in 1954, Gideon Sundback died. Sundback was a Swedish-American electrical engineer who perfected the zipper.
He was responsible for improving the “Judson C-curity Fastener”. At that time the company’s product was still based on hooks and eyes. Sundback developed an improved version of the C-curity, called the “Plako”, but it too had a strong tendency to pull apart, and was not any more successful than the previous versions. Sundback finally solved the pulling-apart problem in 1913, with his invention of the first version not based on the hook-and-eye principle, the “Hookless Fastener No. 1”. He increased the number of fastening elements from four per inch to ten or eleven. His invention had two facing rows of teeth that pulled into a single piece by the slider, and increased the opening for the teeth guided by the slider.
In 1914, Sundback developed a version based on interlocking teeth, the “Hookless No. 2”, which was the modern metal zipper in all its essentials. In this fastener each tooth is punched to have a dimple on its bottom and a nib or conical projection on its top. The nib atop one tooth engages in the matching dimple in the bottom of the tooth that follows it on the other side as the two strips of teeth are brought together through the two Y channels of the slider. The teeth are crimped tightly to a strong fabric cord that is the selvage edge of the cloth tape that attaches the zipper to the garment, with the teeth on one side offset by half a tooth’s height from those on the other side’s tape. They are held so tightly to the cord and tape that once meshed there is not enough play to let them pull apart. A tooth cannot rise up off the nib below it enough to break free, and its nib on top cannot drop out of the dimple in the tooth above it. U.S. Patent 1,219,881 for the “Separable Fastener” was issued in 1917.
The name zipper was created in 1923 by B.F. Goodrich, who used the device on their new boots. Initially, boots and tobacco pouches were the primary use for zippers; it took another twenty years before they caught on in the fashion industry. About the time of World War II the zipper achieved wide acceptance for the flies of trousers and the plackets of skirts and dresses.
For more on the invention of the zipper, the hucksters who sold it and it’s final succcess check out Zipper: An Exploration in Novelty.