Torsion springs are the underlying mechanism accountable for opening your garage door. While you may think that your electrical garage door opener is doing all of the work, it is actually the torsion springs that do the heavy lifting. Much smaller examples are discovered on the pop-up doors of compact disc players.
When the garage door closes, the torsion springs rewind or reset. When the electrical garage door opener begins to raise the door, the spring-loaded system is triggered and the door increases smoothly and easily.