Garage Door
The garage door is an amazing dynamic system with torques, tensions and gravitational force all in one. Prior to the existence of the automobile, the primary method of transportation was by horse and carriage. When not in use, people stored horse carriages in what were known as a carriage house, barn-like outbuildings with swing doors for access. 
During the early years of the 20th century, cars were working their way into society. Ford Motor Co. was one of the pioneers of the automotive revolution, shipping its first vehicle to a Detroit physician on July 20, 1903. One hundred later, cars have become a pillar of the industrialized world with an estimated 42 million vehicles produced per year.
When the automobile replaced the horse and carriage as the preferred method of transportation, storage of the automobile became an issue. Until about 1910, most people parked their cars in public parking garages where you could a space for a monthly fee. Soon, however, there wasn’t enough room in these garages and car owners began to incorporate garages onto their properties or near their homes.
Early garage doors were similar to carriage house doors using strap hinges and opening outwards. These doors were heavy and awkward to open. Hinges often broke or screws pulled out of the wood. If there was snow on the ground, the doors couldn’t easily be opened. A better door was truly needed. There are two main types of garage doors on the market today roll ups and one-piece-doors either way they are both
overhead doors.
