Help for ideas/examples of mechanisms that can be assembled

I am trying to brainstorm different mechanisms that can join and separate without additional tools. Preferably but doesn't have to that it can withstand compression and bending in use (~150 kg and 300 Nm). Any provided examples are appreciated (from simple latches to .

An example (albeit poor one because they do not completely separate) is like this

submitted by /u/Infamy444
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from The ME Hang Out https://ift.tt/2ZsDKkV https://ift.tt/eA8V8J

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