I want to make a sprung latch mechanism which keeps a door in place until a certain force is applied to the door. In the diagram attached, the force the door must release at is Fd, and the latch spring force necessary to hold it until Fd is reached is Fs.
My questions are these: 1. How do I work out what force spring I need? 2. Assuming the contact is frictionless, and that distance d stays the same, does it make a difference what the angle j is?
Many many thanks for any help!