Introducing Torsion Spring: -

A  Torsion spring is nothing but an ordinary spring that operates by  twisting or torsion. It is a flexible, elastic object that stores  mechanical energy, when it’s twisted. During the twisting mechanism, it  actually exerts a force (torque) in the opposite direction; which is  directly proportional to the amount of angle it’s twisted. 

When  it comes to a garage door, torsion springs play a key role while  opening or closing it every time. Here is a few important