# How Walter Hunt Invented the Modern Safety Pin

> Walter Hunt's 1849 patent for a simple, coiled wire device that keeps sharp points covered while fastening fabric.

- **Patent:** US 6281
- **Original title:** Walter hunt
- **Owner:** Walter Hunt
- **Granted:** 1849
- **Status:** Active
- **Times cited:** 4
- **Field:** mechanical, consumer_electronics

## What it does

The device consists of a single piece of wire bent into a spring-like coil at one end. This coil provides the tension necessary to keep the pin closed. The other end features a protective sheath or guard that covers the sharp point of the pin when it is snapped into place. This mechanism allows the pin to pierce fabric and remain securely fastened without pricking the user.

## What it does NOT cover

- Does not cover straight pins lacking a protective clasp mechanism.
- Does not cover buttons, zippers, or other types of mechanical fasteners.
- Does not cover the use of multiple materials, as the patent specifically details a single continuous wire structure.

## The clever bit

By using the inherent tension of a coiled wire, Hunt created a self-closing mechanism that acts as both the hinge and the spring, eliminating the need for complex multi-part assemblies.

## Real-world examples

1. Standard safety pins used in sewing kits
2. Diaper pins
3. Temporary clothing repairs

## Why it matters

This invention replaced dangerous, primitive straight pins that easily fell out or caused injury. It became a universal household staple for garment repair and textile manufacturing, demonstrating how a simple mechanical improvement can achieve global utility.

## Frequently asked questions

### What does How Walter Hunt Invented the Modern Safety Pin cover?

Walter Hunt's 1849 patent for a simple, coiled wire device that keeps sharp points covered while fastening fabric.

### Who owns patent US 6281?

Walter Hunt owns this patent, granted in 1849.

### When does this patent expire?

This patent has expired and is now in the public domain — anyone can use the invention freely.

### What is patent US 6281 cited by?

This patent has been cited by 4 later patents that build on its ideas.

### What problem does this patent solve?

This invention replaced dangerous, primitive straight pins that easily fell out or caused injury. It became a universal household staple for garment repair and textile manufacturing, demonstrating how a simple mechanical improvement can achieve global utility.

### What does this patent NOT cover?

Does not cover straight pins lacking a protective clasp mechanism.

**Full plain-English explainer:** https://patentbrief.org/patent/us/6281/safety-pin-hunt

**Original patent:** https://patents.google.com/patent/US6281

---

_Source: PatentBrief — https://patentbrief.org. Patent facts are from public records; the plain-English explanation is PatentBrief's._


## Related patents

Semantically similar inventions in the PatentBrief corpus:

- [How King Gillette Invented the Modern Disposable Safety Razor](https://patentbrief.org/patent/us/775134/safety-razor-gillette) — King Gillette's 1904 patent for a safety razor with a thin, replaceable, double-edged blade that changed how the world shaves.
- [How Gideon Sundback Invented the Modern Zipper](https://patentbrief.org/patent/us/1219881/zipper-separable-fastener) — The 1917 patent for the separable fastener that perfected the design of the modern zipper using interlocking teeth on two flexible tapes.
- [How Levi Strauss Invented the Copper-Riveted Jean Pocket](https://patentbrief.org/patent/us/139121/blue-jeans-riveted-levi-strauss) — This 1873 patent describes the use of metal rivets to reinforce the corners of pockets on work pants, preventing them from ripping under heavy use.
- [How Elias Howe Invented the Modern Lockstitch Sewing Machine](https://patentbrief.org/patent/us/4750/sewing-machine-howe) — Elias Howe's 1846 patent for the lockstitch sewing machine, which used two separate threads to create a durable stitch that revolutionized garment manufacturing.
- [How Joseph Glidden Invented Modern Barbed Wire](https://patentbrief.org/patent/us/157124/barbed-wire-glidden) — A 1874 patent for a specific wire-fence design that used twisted strands to hold sharp barbs in place, fundamentally changing how the American West was fenced.