Click metal mechanism - How does it work?

I'm currently working on a project where I try to make a pop-up camera (similar to recent smartphone but with a manual mechanism rather than a step motor). My plan is to make a mechanism similar to those found in click pens. Or actually any push switch with 2 positions mechanism. An electrical contact in one of the position would be a bonus.

Those metal click pen mechanism seem to do the trick, but I can't find reference to how they work.

https://www.pennstateind.com/store/PKEDCDST.html- https://cdn3.volusion.com/sjdmf.pwzpc/v/vspfiles/photos/TWP-SS-CLICK-2.jpg?v-cache=1496854065Anyone knows how those works? Or if someone has such mechanism drawings I'd be most interested !

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