Zipper

Why it matters

The zipper is a chain of interlocking teeth that turned fastening into a single motion. It took decades to move from novelty hardware to everyday clothing.

How it works

A slider wedges two rows of teeth together or pulls them apart. The trick is simple geometry: each tooth has a small shape that locks with the next tooth when guided by the slider.

Design notes

• Early versions were marketed for shoes and tobacco pouches before clothing adoption accelerated.
• The word zipper became popular after the sound and speed became the product story.
• A failed slider is often more important than broken teeth because the slider controls the lock.

Timeline

1. 1893: Early clasp-locker patent era
2. 1910s: improved separable fasteners
3. 1930s: mainstream clothing adoption