An overhead door operator system (1) for opening and closing an opening (2), comprising a door frame (3) comprising a first frame section (4) at a first side (7) of the opening (2) and a second frame section (6) at a second side (5) of the opening (2). The operator system further comprises a door (8) arranged to be moved between an open and closed (C) position, the door (8) being movably connected to the door frame (3) and a drive unit (10) mounted on the door (8), the drive unit (10) comprising at least one motor (11) arranged to move the door (8) from the closed position (C) to the open position (O). An elongated transmission member (19) extends along the first side (7) of the opening (2) and the first frame section (4). The drive unit (10) further comprises a driven transmission member (18) in driving connection with the motor (11).

A drive unit for a sliding arrangement, in particular a sliding door, includes a carriage, which is formed for linearly mobile mounting in relation to a sub-structure of the sliding arrangement, a deflection roller rotatable around a roller axis at the carriage for deflecting a drive belt of the sliding arrangement, and a tensioning device, having a shaft with male thread rotatable around a shaft axis, a first shaft reception with female thread for receiving the male thread of the shaft, a second shaft reception for linear mobile reception of the shaft, and a compression spring between the second shaft reception and a spring abutment at the shaft. The shaft is disposed for tensioning the drive belt by increasing the distance between the first shaft reception and the second shaft reception.

A belt tensioning system (170) for tensioning a belt (171) of a belt drive system (970) for transferring torque from a drive unit (112) of a door operating system (100) to a sliding door leaf (101) of a sliding door assembly (200), the belt tensioning system comprising a belt wheel (176) connectable to the belt (171) for torque transfer between said belt wheel (176) and an additional belt wheel (175) of the belt drive system (970); a belt wheel guiding arrangement (330), the belt wheel (176) being movably connected to said belt wheel guiding arrangement (330); and a belt tensioning arrangement (470) operatively connecting the belt wheel (176) and the belt wheel guiding arrangement (330) for adjusting the position of the belt wheel (176) relative the belt wheel guiding arrangement (330).

A method for determining the tension of a drive belt, wherein the drive belt is provided for transmission of a torque generated by a drive unit to a load, for example, a door leaf of a door system includes a first process step a., the load is moved from a moving state into a rest state. In a following process step b., the motor voltage is recorded during execution of process step a. and the time-resolved motor voltage curve is prepared. In step c., the motor current is determined from the recorded motor voltage or the motor voltage curve and a time-resolved motor current curve is prepared. In a last step d., the time-resolved motor current curve is evaluated and the tension of the drive belt is determined by means of selected curve features of the motor current curve.

The disclosure relates to a corner bracket (14, 16) for a vertical moving door (2), the corner bracket (14, 16) comprising: a base plate (32) configured to be attached to the door (2); and a guide path (34) for a lift cable (4, 6) arranged in the base plate (32). A switch (28) is arranged in the base plate (32) and configured to be actuated by the lift cable (4, 6) in the event of a breakage of the lift cable (4, 6). The disclosure further relates to a method, performed by a control device (200), for stopping a vertical moving door (2) of a vertical moving door system (100), the vertical moving door system (100).

A flat-type ventilation door-window structure includes a frame (1), a first movable sash (2) and a second movable sash (3). The first movable sash (2) and/or the second movable sash (3) can slide up and down in an opening (11) of the frame (1). A first guide device (300) and a second guide device (400) being respectively provided between the first movable sash (2) or the second movable sash (3) and the frame (1). The first guide device (300) and the second guide device (400) can guide the first movable sash (2) or the second movable sash (3) to change the sliding path. The flat-type ventilation door-window structure can block outdoor sound, rain and air, and improve sound insulation, water tightness and air tightness.

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.

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.

A tensioning device for a door operating system includes a pulley carriage on which a pulley of the door operating system is mounted for rotation, the pulley carriage being movable relative to a track of the door operating system. The tensioning device further includes an adjuster configured to move the pulley carriage relative to the track and thereby alter a level of tension in a longitudinal drive component of the door operating system, the adjuster of the tensioning device being accessible from an end of the tensioning device facing a track operator end of the door operating system. The tensioning device also includes a resilient member operatively engaged with the adjuster, the resilient member configured to provide damping of forces experienced by the longitudinal drive component.