Locking Hinge

This design is useful where you need a product with locking intervals. Due to the spring (Can be 3D printed or inserted) being in compression the hinge is constantly locked. When you press in the top of the axle the hexagonal key is freed from its negative and the hinge will rotate until the spring pushes the hex back into another oriontation. There is also an option to lock the hinge in a freely rotating state by twisting the bottom 90 degrees when the hinge is engaged.