Trying not to reinvent the wheel? Need a simple proven linkage, detent, clamp, or other mechanical widget?
Here are my idea sources when trying to sketch out a mechanical design. Often the path of least resistance is reusing an existing design.
Misumi Library – Downloadable designs for mechanisms, fixtures and small equipment! A hidden gem.
507 Mechanical Movements – Your favorite mechanical movement book, now animated!
Thang010146’s Videos – A channel full of animated mechanisms
Google Patents – Patent language is infuriatingly vague but the diagrams are often well illustrated and provide insight to the working principals of the design. This search can cast a wide net, it helps to target the portfolio of a specific company.
Used book stores are also a great way to find interesting resources. The quality of “mechanical movement” books can vary a lot so it helps to flip through a few.