In the past, the biggest concern with operating an overhead garage door was the potential risks associated with the springs used for balancing the door weight. Pre mid 1960s garage door installations typically relied upon a pair of stretched (tensioned) springs to assist the operation of the garage door pivoting hinges. These springs became loaded (tensioned) as the door was moved into the closed position. Unloading (releasing) of the stored spring energy occurred as the door was opened to the horizontal overhead position. One of the most dangerous aspects of these spring systems was that after a period of time, often without any maintenance or inspection, the points of attachment of these springs would rust or become weak.
These doors can be chain driven either manually, or can be automated using electric motors. Roll up doors require more frequent evaluation and servicing than a standard overhead garage door. The tracks that are mounted vertically on both sides of the garage opening need maintenance and cleaning more frequently, and are often blocked by foreign obstructions or damaged by collision of some type. These roll up doors are often held open by some type of ratcheting action. Proper balancing of these doors is often more important than an overhead type of door, as the weight of these type of doors is normally much greater than an overhead door.
Now she knows that something isnt right. As she stands there rubbing her eyes, trying to make sense of what was happening, a man suddenly emerges from her family room, looking at one of her familys DVD covers. At that point, the wife begins screaming for her husband, "Someone is in the house! Get up! Get up! When the husband ran out of the bedroom, he saw the criminal sprinting across the house to the front door. It just so happens that there was a child safety lock on the front door, so the home invader stood there struggling with the front door long enough for the husband to retrieve his rifle and grab the man. The police soon came as they held the robber at bay, and an arrest was made. It turns out that this burglar was part of a group who had been invading homes in the area.
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