To make the independent sections act as a complete door, the sections must be hinged together. Hinges are found on the end stiles and center stiles at the meeting rails. All hinges perform two basic functions: 1. They join the sections together with bolts or screws. 2. They allow the sections to break, independent of each other, as the door travels. Hinges on the end stiles perform two additional tasks: 1. They are designed to support a roller on which the door travels. 2. They are offset to provide a flush fit to the door itself when in the closed position.
these hold the Sections of the door together and allow the door to bend as it goes up the tracks.
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