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Source：Intuitive Mechanical Learning,Fan Yu Animation
SD cards are something everyone has seen and used. When inserted, they automatically lock in place, and pressing again makes them pop out. But what structural principle is behind this function?
This mechanism is a classic application of springs and a “maze groove”, designed ingeniously:
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The cleverness lies in the design of the guide groove, where each corner is designed with steps so that the pull rod can only move along a specific trajectory and cannot reverse. This structure is quite similar to that of a ballpoint pen:
As can be seen, the design does not pursue overly complex structures, but rather clever ones.