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 winding device for adjusting the elastic energy of an overhead door spring system installed on a wall structure, the door having at least a door panel which can be moved up and down constrained within a track. The door also has a counterbalancing system with a coil spring having a stationary end and a winding end. The door system also has a central shaft held within the counterbalancing system. The winding device has a worm gear with a flange, or collar portion, a worm screw engaged by the worm gear, a box or container or a retainer to hold the worm gear and worm screw together in an engagement status. The worm gear is engaged with the central shaft by at least one fastener. It can also be used to lift said door directly when said spring is broken, or there is no spring at all.

An example door stop mechanism is provided. The door stop mechanism includes a body, a connection member, a spring, and a brake. The spring is coupled to the body and the connection member. The brake is positioned adjacent to the body. The brake moves between an engaged position via a spring force of the spring that causes the body to interact with the brake such that the brake contacts a track of an overhead door and an disengaged position via a force that acts against the spring force to pull the body away from the brake such that the brake moves away from the track to allow the overhead door to move

A system and method of use relating to a hidden motorized system for use in windows that can reliability and consistently open and close the window via remote operation. Specifically, a motorized system is disposed inside a window in a manner without requiring unsightly modifications to the window. The motorized system can be controlled via wireless remote or wired remote switch. The entire system fits within a conventional window, such as a single or double hung window, in a manner that is hidden from view, thereby keeping the conventional ornamental look of the window.

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 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 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 winding device for adjusting the elastic energy of an overhead door spring system installed on a wall structure, the door having at least a door panel which can be moved up and down constrained within a track. The door also has a counterbalance system with a coil spring having a stationary end and a winding end. The door system also has a central shaft held within the counterbalance system. The winding device has a worm gear with a flange, or collar portion, a worm screw engaged by the worm gear, a box or container or a retainer to hold the worm gear and worm screw together in an engagement status. The worm gear is engaged with the central shaft by at least one fastener. It can also be used to lift said door directly when said spring is broken, or there is no spring at all.

A system and method of use relating to a hidden motorized system for use in windows that can reliability and consistently open and close the window via remote operation. Specifically, a motorized system is disposed inside a window in a manner without requiring unsightly modifications to the window. The motorized system can be controlled via wireless remote or wired remote switch. The entire system fits within a conventional window, such as a single or double hung window, in a manner that is hidden from view, thereby keeping the conventional ornamental look of the window.