Garage Door Torsion Springs
There is usually only one torsion spring in average weight residential garage doors although the installation of a second one is often suggested so that the door will continue to move if the first spring breaks. The torsion springs are found above the door and when there are two of them, there is one at the left and one at the right side of the door. There is a metal rod called shaft running through torsion springs, which is connected with the cable drums at the two ends and secured with end bearing plates. The cables are wrapped around the drums and are also connected with the bottom fixtures in each side of the door.
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Garage door torsion springs have one winding cone at one side. They move from this side. At the other side, there is a stationary cone. They don't move at this side. As the spring moves on one side, it creates torque which is transferred to the shaft. Since the cable holds the door, there is no danger from the shaft's movement. In fact, torque allows to the cable to be tight around the drum and as the cable winds up, the torsion spring unwinds and the door moves up. Thanks to torque the door moves up but also remains open. Thanks to the tension of the torsion spring the door will also remain closed on the floor without flying up. Though, in order for the system to work alright, the power of the springs must almost equal to the weight of the door. If their power is greater, the door would jump up. If it's less, the door won't open with ease. With the right spring, the door is balanced and opened by the opener or manually with ease.