I have a John Deere riding mower where you have to raise the seat to get at the battery and other mechanical components.

To raise the seat, you have to swivel a tiny by stout metal latch that keeps the seat from bouncing around on it's hinges. The metal latch is held in it's position by gravity-- you have to use your finger to swivel it when you want the seat to move.

This is engineering at it's finest. Effective, durable, efficient in it's purpose. Timeless design as well-- I don't think it could be improved upon.