Shivam Dehinwal made this bookshelf light that’s disguised as a book and is easy to turn on and off with a simple slide into or out of alignment with the rest of your books. Here’s more from Instructables:
The fixed “trigger” has a wedge shaped top which is followed by the limit switch. This category of mechanisms is called Cam-follower where an output shaft follows a certain Cam profile. You can tweak the range of motion by changing the position of the trigger along the slot cavity.
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