Multi-panel door system, and dual-synchronization drive assembly for a multi-panel door system

A door system, comprising:

• a door having a plurality of door panels linearly movable between an open position and a closed position;
• and
• a drive assembly operable to drive the door panels between the open position and the closed position, the drive assembly including:
• a dual gear unit operatively connected to the door panels, wherein the dual gear unit includes a first gear and a second gear;
• and
• a transmission assembly including a first transmission belt operatively connected to the first gear of the dual gear unit to transmit a drive power to a first door panel of the plurality of door panels which advances the first door panel between the open position and the closed position, and a second transmission belt operatively connected to the second gear of the dual gear unit to transmit the drive power to a second door panel of the plurality of door panels which advances the second door panel between the open position and the closed position;
• a stationary main gear and a stationary secondary gear, the stationary secondary gear the stationary main gear and the dual gear unit, wherein the first transmission belt consists of a single belt having a first belt length, and the first belt length is sized so that the first transmission belt operatively connects the first gear of the dual gear unit to the stationary main gear and the second transmission belt has a second belt length that is less than the first belt length, and the second belt length is sized so that the second transmission belt operatively connects the second gear of the dual gear unit to the stationary secondary gear.

A door system, comprising:

• a door having a plurality of door panels linearly movable between an open position and a closed position;
• and
• a drive assembly operable to generate a drive power to drive the door panels between the open position and the closed position in a manner that synchronizes the linear movement of the plurality of door panels to fully advance the plurality of door panels to the open position or the closed position, wherein the drive assembly includes:
• a dual gear unit including a first gear and a second gear, the first gear and the second gear mounted to a drive shaft;
• a stationary main gear and a stationary secondary gear;
• a first transmission belt consisting of a single belt having a first belt length, and the first belt length is sized so that the first transmission belt operatively connects the first gear and the stationary main gear to transmit the drive power from the drive shaft to a first door panel of the plurality of door panels and advance the first door panel between the open position and the closed position, and
• a second transmission belt having a second belt length that is less than the first belt length, and the second belt length is sized so that the second transmission belt operatively connects the second gear and the stationary secondary gear to transmit the drive power from the drive shaft to a second door panel of the plurality of door panels and advance the second door panel between the open position and the closed position.

A drive assembly for a door system that includes a door having a plurality of door panels movable between an open position and a closed position, the drive assembly comprising:

• a dual gear unit operatively connected to the plurality of door panels to cause a synchronized linear movement of the plurality of door panels which fully advances the door panels to the open position or the closed position, the dual gear unit including a drive shaft, a rotatable first gear mounted to the drive shaft operatively connected to a first transmission belt, and a rotatable second gear mounted to the drive shaft operatively connected to a second transmission belt;
• the first transmission belt consisting of a single belt having a first belt length sized so that the first transmission belt operatively connects the rotatable first gear and the stationary main gear to transmit a drive power to a first door panel of the plurality of door panels which advances the first door panel between the open position and the closed position;
• and
• the second transmission belt having a second belt length that is less than the first belt length, the second belt length sized so that the second transmission belt operatively connects the rotatable second gear and the stationary secondary gear to transmit the drive power to a second door panel of the plurality of door panels which advances the second door panel between the open position and the closed position, wherein the stationary secondary gear is located between the stationary main gear and the dual gear unit.