|
|
Torsion springs
This spring system, while slightly more complex, performs the same counter-balancing function. Mounted above the door opening, the spring is manually wound, or charged, then installed on a shaft which runs through the spring. The spring actually turns the shaft which raises or lowers the door via the cables winding on drums. Torsion springs are generally smoother in operation, longer lasting and safer than extension springs when installed properly.
|