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How does a wedge help secure a hammer head to its handle?

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A diagram displays six types of simple machines with labeled illustrations: inclined plane, wedge, screw, lever, wheel and axle, and pulley, each shown with real-world examples like ramps, axes, screws, seesaws, door handles, and pulleys lifting objects. — simple machine Six simple machines for transforming energy into work.

A wedge is a simple machine that tapers to a thin edge and is used for tasks such as splitting, lifting, or tightening.

When used to secure a hammer head to its handle, the wedge functions by being driven into the end of the handle that sits inside the hammer head. As the wedge is forced into the wood, it exerts outward pressure, causing the handle to expand and tighten firmly against the interior walls of the hammer head. This mechanical action effectively locks the two components together, ensuring the head remains secure during use.1