A bi-fold overhead door system that includes a frame, a bi-fold overhead door and a hydraulic cylinder. The bi-fold overhead door has an upper door leaf and a lower door leaf. The upper door leaf is pivotally mounted to the frame. The lower door leaf is pivotally mounted to the upper door leaf. The hydraulic cylinder has a first cylinder end and a second cylinder end. The first cylinder end is operably attached to the frame. The second cylinder end is operably attached to the upper door leaf. The hydraulic cylinder is capable of moving the bi-fold overhead door between a closed configuration and an open configuration. At least one of the frame and the upper door leaf has a slot formed therein. When the bi-fold overhead door is in the closed configuration, the hydraulic cylinder is substantially recessed in the slot.

In example implementations, a track of a vertically stacking door is provided. The track includes a vertical track, a track coupling coupled to the vertical track, a first curved track portion coupled to the track coupling, a second curved track portion coupled to the track coupling, and a ramp coupled to the vertical track before the track coupling.

In example implementations, a header seal for a vertical stacking panel door is provided. The header seal includes a header channel and a seal plate. The header channel includes a body portion comprising a plurality of openings to receive a mechanical fastener and a lip portion coupled to the body portion. The seal plate includes a bracket comprising a plurality of openings to receive a mechanical fastener to connect the bracket to the top most vertical panel and a flexible member to contact the lip portion to form a seal against the lip of the header channel when the vertically stacking panel door is in a closed position.

A track of a vertically stacking door includes a vertical track, a first curved track portion, a second curved track portion, a first horizontal track portion coupled to the first curved track portion, and a second horizontal track portion coupled to the second curved track portion. The first curved track portion and the second curved track portion are split off from the vertical track and the first curved track portion and the second curved track portion each comprises multiple radii of curvature.

In example implementations, an end cap is provided. The end cap includes a body portion comprising a top end, a bottom end, a front side, a back side, an inner side, and an outer side, a plurality of openings aligned between the inner side and the outer side to receive a mechanical fastener to connect to an end of the panel, a cam lever coupled to the top end, wherein the cam lever is to rotate around an axis to generate a lift force to lift and separate an adjacent panel, and a plurality of wheels coupled to the inner side, wherein the panel moves along a horizontal track via the plurality of wheels aligned with the horizontal track.

A balance system used with a door of a cupboard comprises a transmission shaft, a first pulley on the transmission shaft, and a balance component. The first pulley is connected to a door belt, one end of the door belt is secured to the first pulley, and the other end of the belt is connected to the door. The balance component comprises a balancing member, a balancing belt and a second pulley on the transmission shaft. One end of the balancing belt is connected to the second pulley, and the other end of the balancing belt is connected to the balancing member, such that the balancing member is hung on the second pulley. The first pulley and the second pulley rotate synchronously, and the door belt and the balancing belt are wound oppositely. With the balance system, a small driving force can open/close the door.

In example implementations, a header seal for a vertical stacking panel door is provided. The header seal includes a header channel and a seal plate. The header channel includes a body portion comprising a plurality of openings to receive a mechanical fastener and a lip portion coupled to the body portion. The seal plate includes a bracket comprising a plurality of openings to receive a mechanical fastener to connect the bracket to the top most vertical panel and a flexible member to contact the lip portion to form a seal against the lip of the header channel when the vertically stacking panel door is in a closed position.

A vertical panel door stacking system for a door having panels with end caps coupled thereto. The end caps include a body portion, a cam lever to rotate around an axis to generate a lift force to lift and separate an adjacent pair of panels of the panels of the door, a first track wheel, a second track wheel, and a third track wheel. The track wheels interact with a track system to guide movement of the door panels between a closed position and an open position.

Provided are door systems having a plurality of door panels and a frame, the door panels being movable between an extended position closing an opening in a building structure, and a folded retracted position. When in the extended position, the door panels interlock with each other forming a barrier to wind, dirt, dust and insects. The frame is movably attached to the building structure and when the door panels are in the extended position, the frame moves and engages the door panels with a sealing member to provide an airtight seal of the opening in the building structure.

A balance system used with a door of a cupboard comprises a transmission shaft, a first pulley on the transmission shaft, and a balance component. The first pulley is connected to a door belt, one end of the door belt is secured to the first pulley, and the other end of the belt is connected to the door. The balance component comprises a balancing member, a balancing belt and a second pulley on the transmission shaft. One end of the balancing belt is connected to the second pulley, and the other end of the balancing belt is connected to the balancing member, such that the balancing member is hung on the second pulley. The first pulley and the second pulley rotate synchronously, and the door belt and the balancing belt are wound oppositely. With the balance system, a small driving force can open/close the door.