Garage Door Extension Springs
Garage door extension springs are found at the two sides of the door right above the tracks. They always come in pairs since each one is installed at the two sides of the door. As a consequence, springs must have equivalent power with the door's weight and there are two extension springs, whose power is split amongst them. So, if the door weighs about five hundred pounds each extension spring must have equivalent power of two hundred fifty pounds. This way, they manage to counterbalance the door by applying the same amount of power at both sides. This is also the reason for having both extension springs replaced when one of them is damaged.
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These springs extend and contract in order to move the door. When the garage door is closed on the floor, the coils of the springs are extended and placed under a lot of tension, which is used when the door must open. At this time, they start contracting as the door moves up and their tension is minimized when the door is in its full opening position. There is often a safety cable threaded in each spring so they won't fly out if breaking. The safety cables look like regular cables but are used for people's safety. They are attached close enough to where the two end parts of the springs are attached and inserted in the spring. Garage door extension springs manage to pull up and lower the door with the help of the cables alongside a pulley system connecting and facilitating their mission.