PhysicsFun 719 - The Pin-Tumbler Lock
Pin-Tumbler Lock: simple and accurate model of how a basic lock works. The pins (orange/green) are held in place with springs and keep the tumbler from sliding and releasing the chain. The contour cut into the edge of the key must match the lengths of the green parts of the pins. When the key is inserted, the edges of the green pins line up allowing the tumbler to slide, unlocking the chain. In most locks the tumbler rotates instead of sliding, but the principle is the same. One of many “Transparently Obvious” models in the Mechanical Gifs series created by Theodore Gray.
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