As a home expert witness, I'm called upon often times per year to evaluate garage door injuries. Garage doors come in many shapes and sizes. Their functions vary from basic security of an area to cosmetic concealment. Most doors could be broken on to several basic styles or categories. Typical modern garage doors for residential applications are generally predominantly of the overhead sectional variety. That style of door is available in many configurations, materials, levels of insulation, and a wide range of appearance possibilities. They're available as a prefabricated kit, or built as a custom design to check the decor of any building. Commercial warehouse type installations often dictate higher security requirements. A good choice with this security type of door could be the "roll-up" style that resembles a spin top desk type of door. This door could be manufactured with many different materials that is often as strong as the adjacent walls, making forced entry through this opening very difficult. Other common commercial installations include light weight aluminum single or sectional panel doors. These doors function more for closing off an already secured area than for assuring point security. allister garage door openerIn the past, the greatest concern with operating an overhead garage door was the potential risks associated with the springs useful for balancing the entranceway weight. Pre mid 1960's garage door installations typically relied upon a pair of stretched (tensioned) springs to aid the operation of the garage door pivoting hinges. These springs became loaded (tensioned) as the entranceway was moved in to the closed position. Unloading (releasing) of the stored spring energy occurred as the entranceway was opened to the horizontal overhead position. One of the very most dangerous areas of these spring systems was that after a period of time, often without any maintenance or inspection, the points of attachment of those springs would rust or become weak. This weakening of the springs or points of attachment would often lead to an inadvertent explosive failure flinging the broken spring components across the garage, embedding the spring or steel components in to the garage walls, cars or other items in the trail of travel. Unfortunately, sometimes everyone was in the trail of travel of those explosive occurrences. As these springs failed, being an attempted safeguard, some manufacturers devised a "caging" system for the springs. These cages were retrofitted onto the stretched springs in an effort to capture the parts that would release if your failure occurred. While these caging devices were helpful, they certainly were not completely effective. A few of these spring devices continue to be being used today. Whenever this disorder exists or the caliber of garage components is questionable, a qualified professional service technician must certanly be consulted. purchase garage door
In response to the inherently dangerous old-style garage spring issues as above, a more recent and safer system for opening the overhead garage door was created. The concept was to transfer force or weight of the entranceway via a cable and pulley system to a vertical rod now built with a torsion (twisted) spring. This sort of spring is installed with specialty hardware and bolts to a fixed plate at one end, while the whole spring is installed around a horizontal pipe. This load balancing device is normally installed directly on the header of the garage opening. Using appropriate cables, connectors and pulleys, the weight of the garage door is transferred in to the torsion spring system. The difference involving the old-style stretched spring and the newer torsion spring is the way in which that the spring energy is stored. With the old-style stretched spring, the energy is stored and released by pulling on the spring or returning the spring to its un-stretched condition. With a torsion type of spring, the energy is imparted or removed by rotating the spring clockwise or counter clockwise based upon the direction of usage. With professional installation, the entire loading of the torsion spring is controlled by the garage installer, and is set by the weight and size of the garage door that it is operating. When this type of torsion spring fails, it remains attached and intact to the location on the horizontal control rod where it was mounted. I haven't heard about or seen any torsion spring fly across a garage, creating injury from failed components much like the stretched older style garage door springs. This is not saying that injuries haven't occurred with the torsion style spring. The installing of this type of spring is generally safe when left to an experienced garage door installation professional. Severe and serious injuries have occurred when untrained, unqualified individuals have attempted to set up or service this type of spring.