Before we had the whole idea of garage doors we had barn doors. As technology advanced we got into garage doors. The first concept of overhead doors was by strapping two barn doors together and adding rails to the top and rollers at the bottom to make the door slide with a counterweight system pulling it up. This was the first step to making the flip open chin buster styled garage door. Replacing the counter weights with extension springs eliminated the need for a pulley system with a heavy weight.
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