Simple locks {lock} {lock and key}|, for chests or cases, have a keyhole and a key that looks like a little flag {key, lock}. When flag turns 360 degrees in lock, flag pushes a pin that slides a bolt in or out.
Door locks can use a key with blade ridges and slots on blade sides. Lock has a barrel. In lock barrel and wall are five small rods {pin} on springs in vertical tubes. Pins have two pieces, at different heights corresponding to ridges on key blade. When key is in lock, dividing lines for pins are at same radius as barrel radius, so barrel can turn. Barrel turn moves a bolt.
Practical Affairs>Machine>Kinds>Mechanical>Lock
7-Machine-Kinds-Mechanical-Lock
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Date Modified: 2022.0224