Interlocking Teeth Model Zipper History(1)

Gideon Sundback, a Swedish-born engineer, joined the company, then called the Automatic Hook and Eye Company, in Hoboken, in 1906. At that time the company's product, still based on hooks and eyes, was called the "C-curity Fastener". Sundback developed an improved version of the C-curity, called the "Plako", but it too had a strong tendency to pull apart, and wasn't any more successful polo t shirts women 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".

Zipper slider brings together the two sidesThat version, however, had a tendency to wear out quickly, and again was not a commercial success. Finally, in 1914 Sundback developed a version based on interlocking teeth, the "Hookless polo t shirts for women 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 polo shirts on sale 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. The classic zipper was made of a brass alloy, a metal that has low friction and is long-wearing.