A latch assembly connected to the drive unit of a bi-fold door retains the bi-fold door in engagement with upright columns of a building with elongated straps attached to the upright columns and rotatable latch drums mounted on a drive shaft of a drive unit. Lift devices powered by the drive unit raise and lower the bi-fold door. Latch assemblies include springs that maintain tension on the straps during the opening and closing of the bi-fold door.

A frame assembly supporting an overhead door has a horizontal header connected to upright columns or posts with splice assemblies. Fasteners mounted on the columns cooperate with retainers on the splice assemblies to position and connect the columns to the header. Hinge assemblies pivotally mount the door on the header for movement between open and closed positions.

A frame assembly supporting an overhead door has a horizontal header connected to upright columns or posts with splice assemblies. Fasteners mounted on the columns cooperate with retainers on the splice assemblies to position and connect the columns to the header. Hinge assemblies pivotally mount the door on the header for movement between open and closed positions.

A bi-fold door is opened with a lift assembly having a plurality of straps attached to power driven lift drums. A latch assembly retains the closed bi-fold door secure to side columns of a building. The latch assembly has a latch strap attached to a latch drum that accommodates the latch strap to hold the closed bi-fold door in contact with the side columns of the building. A floor anchor assembly anchors the bottom of the closed bi-fold door to the floor below the closed bi-fold door to stabilize and inhibit bending and deformation of the bi-fold door frame.

A latch assembly connected to the drive unit of a bi-fold door for retaining the bi-fold door secure to a building has elongated straps attached to rotatable latch drums mounted on the outer ends of the drive shaft of the drive unit. Lift drums powered by a motor driven gearbox raise and lower the bi-fold door. Latch assemblies having springs attached to the straps maintain tension on the straps during the opening and closing of the bi-fold door.

A tilting door assembly having a door frame and a door leaf arranged to move from a vertical closed position to a horizontal open position about a horizontal tilt axis. A plurality of fixed guide tracks guide movement of the door leaf between the open and closed positions. A counterweight is provided, with a sheave and cable system arranged between the door leaf and the counterweight and a winch coupled to the counterweight via a winch cable. The winch is operable to open and close the door such that raising the counterweight moves the door towards the closed position, and lowering the counterweight moves the door towards the open position. The counterweight has a mass that is greater than a mass of the door leaf.

A bi-fold overhead door system including a door frame, an overhead door and a hydraulic cylinder. The frame and the overhead door have corresponding slots formed therein. A top member of the door is pivotally mounted to the door frame. The hydraulic cylinder includes 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 overhead door. The hydraulic cylinder is capable of moving the overhead door between a closed configuration and an open configuration. When the door is in the closed configuration, the hydraulic cylinder is substantially recessed within the frame and door slots.

A rail slider assembly to includes a rail adapted to be attached to a roof of the hangar and including a strut having a pair of lips arranged aligned to each other and defining an opening therebetween. At least one curtain is arranged to extend through the opening. A plurality of sliders is movably arranged inside the strut to support the at least one curtain and move the at least one curtain into an expanded configuration and a folded configuration. Each of the plurality of sliders comprises a frame arranged inside the strut, and a plurality of balls attached to the strut and supported on the lips. The plurality of balls is arranged to slide on the lips to facilitate the movement of the slider inside the strut. The at least one curtain is arranged at an entrance of a hangar.