There are three types of garage doors to choose from: the one-piece door, the roller door, and the sectional door. A sectional garage door consists of many different parts, and each part has its own function. The name 'sectional garage door' is derived from the design of the door.
As the name suggests, it is made of several sections. The garage door parts function to connect all the sections together and to provide counterbalance and travel mechanism so that the sections can move above the door opening.
Different styles of the garage are connected with hinges which allow the sections to pivot. Besides joining the sections, the end hinges also function as the carrier of garage door rollers during the vertical or horizontal door travel movements. Larger doors are usually added with some struts to avoid buckling or sagging of the door sections.
The top and the bottom of a garage door are equipped with fixtures which are connected with fasteners. The fixtures used at the bottom part of the door are called the bottom fixtures, while the fixtures used at the top part of the door are called the top fixtures.
The counterbalance mechanism which enables the door to move upwards is connected with cables that are attached to the bottom fixtures. Additionally, the mechanism is also connected with other cables that are attached to the cable drums at each end of the shaft above the door.
Besides the cables, cable drums, and shaft, the counterbalance mechanism is also supported by other parts such as torsion springs, end bearing plates, center support brackets, couplers, and cones.
One end of the torsion springs is fastened to a bracket which is secured to the jamb. Meanwhile, the other end of the springs is fastened to the shaft using the winding cone's set screws. The torque is transferred to the cable drums via the shaft and on to the cables on each door side.
Each and every part should be maintained regularly, and it only requires basic maintenance tools and techniques. Nothing complex is required for the maintenance of the parts. Simply clean the door with mild detergent and soft car brush at least every three months to get rid of the corrosive substances that can damage the sections as well as the parts of the door. Lubricating the moving parts of each section of is also advisable since this will ensure that the mechanism moves easily and smoothly.