Low head room overhead door system with adjustable short radius track section

An overhead door system, comprising:

• an overhead door having a plurality of pivotally interconnected door panels operable to move between vertical and horizontal positions relative to a door frame, each of said door panels having guide members arranged on opposite sides thereof;
• a pair of generally channel-shaped horizontal track members, each of said horizontal track members defining a generally horizontal channel for guiding movement of said guide members in a generally horizontal plane;
• a pair of generally channel-shaped vertical track members, each of said vertical track members defining a generally vertical channel for guiding movement of said guide members in a generally vertical plane;
• a pair of generally channel-shaped first radius members, each of said first radius members substantially abutting a respective end of said horizontal track members and extending in a defined radius of curvature to substantially abut respective ends of said vertical track members to thereby form a pair of substantially continuous door tracks on opposite sides of said door frame, each of said first radius members defining a first curved channel for guiding movement of said guide members between said horizontal and vertical channels, and further having an opening to permit uppermost ones of said guide members on opposite sides of said overhead door to travel outside of said first curved channels;
• and
• a pair of generally channel-shaped second radius members, each of said second radius members defining a second curved channel extending directly from the opening in said first curved channels for guiding movement of said uppermost guide members into and out of said first curved channels during movement of said overhead door between said vertical and horizontal positions;
• wherein a configuration of said second radius members is adjustable.