The invention relates to an overhead door for covering a door opening comprising a door blade (11) with a plurality of panels (17), said door blade (11) being movable between a vertical, closed position and a horizontal, opened or overhead position within a side frame (12) comprising double-sided a vertical track (13) and a horizontal track (14), connected by a connecting portion (15), respectively, and with a belt (20) or a chain associated with one side each of the said side frame (12) to lift the panels (17) from said vertical position to said horizontal position. To develop the stated overhead door in a way that the advantages of a high speed rollup door and an overhead door are combined, to offer an overhead door with a low space requirement, low maintenance requirements and a high speed closing possibility, the stated overhead door comprises driving means (27) for simultaneously driving a plurality of said panels (17).

The invention relates to a device for automatically opening or closing a window or a door and system and method for controlling and managing indoor air quality via the Internet. The system monitors indoor air parameters through sensors, and when these parameters reach predefined user thresholds, provides room ventilation through natural air convection by automated opening/closing of doors and/or windows. The automatic opening/closing device (26) consists of a housing with means for fixed attachment to a window or a door. The housing hosts: a stepper motor (16) and a means for transforming the rotary motion into a linear motion (9, 13) which drives an extended flexible connection (10, 11). The flexible connection (10, 11) pushes or pulls a support element (1) which is mounted on a window/door, thereby opening the window or door.

A door device for the interior of a passenger transport vehicle, and a passenger transport vehicle having at least one door device. The device includes a double-leaf sliding door with a first door leaf and a second door leaf in one plane. The door device has an upper guide for the first door leaf and an upper guide for the second door leaf. The guides are parallel with one another, and at least the upper guide for the first door leaf is offset with respect to the plane of the first and the second door leaf.

A gate may generally include a gatepost and a plurality of rails pivotally connected to the gatepost and having a plurality of posts hingedly attached to at least one of the plurality of rails. The gate may include a lift system having a translating device in communication with a sprocket, wherein the lift system provides an adjustable force to rotate the plurality of rails from a horizontal position to an upward position. The adjustable force may be provided by a turnbuckle. The gate may include a ground anchor system that allows axial rotation of the plurality of rails about a longitudinal axis of the gatepost.

A door tensioning system for an oven or other appliance includes a chain and spring assembled as a pull member attached at one end to a door and at an opposite end to a base member of the appliance in a manner maintaining spring-mediated tension between the door and the base/bulk of the appliance. The pull member is routed around a bracket-assembly-mounted pulley, where the bracket assembly includes at least one movable bracket member that is movable with the pulley in a manner that will increase or decrease tension in the pull member by increasing/decreasing its effective length between its ends.

In accordance with one aspect of the present disclosure, a movable barrier operator including a body, a motor supported by the body, and a rotatable drive supported by the body and configured to be connected to an elongated driven member. The movable barrier operator further includes a shaft supported by the body and a compound gear mounted on the shaft. The compound gear includes a first gear operably coupled to a drive shaft of the motor and a second gear operably coupled to the rotatable drive. The first and second gears connected such that turning of the first gear causes turning of the second gear.

Chain tensioner devices for use with movable partition systems include endplates configured to be mounted on opposing sides or ends of a movable partition. At least one of the endplates includes a bracket configured for attachment to an end of a chain. The bracket is movable relative to the endplate. The endplate having the bracket also includes an adjustment mechanism located on a common side of the endplate with the bracket, and is operably coupled with the bracket. The adjustment mechanism is configured for adjusting a distance separating the bracket from the endplate. Movable partition systems include such chain tensioner devices. Methods of adjusting a tension in a chain of a movable partition system involve the use of such a chain tensioner device. Methods of installing movable partition systems within structures include the installation of such chain tensioner devices.

An actuator includes first and second structural units arranged independently of one another. An engagement means is arranged in the first structural unit. A drive motor is in driving relationship to the engagement means and arranged in the first structural unit. An anti-backbend chain is in engagement with the engagement means, and a chain depot is arranged in the second structural unit.

The invention relates to an actuator with an anti-backbend chain, a drive motor, and a worm which can be driven by the drive motor and which comprises a helical groove. The anti-backbend chain has engagement means and is guided along the worm, and the chain is in engagement with the worm by means of the engagement means and the helical groove to drive the anti-backbend chain. Such an actuator should have a more compact design and should optionally exhibit less wear. For this purpose, the core diameter of the worm is larger than twice the distance from the motor axis to the motor exterior along which the anti-backbend chain is guided, and the anti-backbend chain is guided at least partly along the drive motor by means of the engagement means.

A device for moving a leaf door, including an electric motor (30), a reduction gear box (40) and a crown wheel-pinion transmission system (50) is provided. The electric motor (30) is kinematically connected to the reduction gear box (40), which in turn is kinematically connected to the crown wheel-pinion transmission system (50). The reduction gear box (40) is reversible.