spring design

http://brightstartravel.com.au/the-difference-between-virtual-platforms-and-other-costless-data-stores Constant force spring, as the name implies, is used to refer a spring that experience and exhibits near-constant force over its range of motion. The concept behind constant force springs stems from metal strips that have undergone a series of changes. Which in return create tension in the metal strips, enabling them to execute that [...]