Motorized operator for doors

An operating system for controllably moving a sectional door between open and closed positions in relation to a door frame having a pair of jambs and an interconnecting header, the operating system comprising, a counterbalancing system having a drive tube adapted to be interconnected with the sectional door proximate the ends thereof, a reversible operator motor mounted adjacent to said drive tube;

• a gear reducer driven by said operator;
• a drive shaft driven by said gear reducer;
• a drive train interconnecting said drive tube and said operator motor for selectively driving the drive tube for moving the sectional door between open and closed positions;
• said drive train including a pair of axially spaced drive gears freely rotatably mounted on said drive shaft and a pair of axially spaced driven gears nonrelatively rotatably mounted on said drive tube and continually engaging said pair of drive gears;
• an operator housing enclosing a portion of said drive tube, said operator motor, said gear reducer, said drive shaft and said drive train;
• and a coupler on said drive shaft retractable from a driving position when the sectional door is stopped, whereby the sectional door may be manually moved toward either of the open position and the closed position, said gear reducer including first and second planetary gears.