1. In 1893, an American engineer named Judson developed a "sliding tightening device" and obtained a patent. This was the original prototype of the zipper. The emergence of this device had an impact on the button hooks used on high boots. However, this invention did not become popular quickly. The main reason was that the quality of this early locking device was not up to standard and it was easy to loosen at inappropriate times and places, causing embarrassment.
2. In 1913, the Swede Sandback improved this crude locking device and turned it into a reliable commodity. The method he used was to attach metal locking teeth to a flexible shaft. This zipper works like this: Each tooth is a small hook that mates with an eyelet underneath a small tooth on the next and opposite strap. This type of zipper is strong and can only be opened when the slider slides so that the teeth open.
3. Zippers were first used in military uniforms. During World War I, the U.S. Army ordered large quantities of zippers for the first time to make clothing for soldiers. However, the promotion of zippers among the people was relatively late. It was not until 1930 that it was accepted by women as a replacement for buttons on clothing.
4. The zipper received its current name in 1926. According to reports, a novelist named Franco said at a business luncheon to promote a zipper sample: "Pull it, and it opens! Pull it again, and it closes!" Very concisely. Describes the characteristics of zippers. This is where the word zipper comes from.