A door opening and closing device for a refrigerator includes a door coupled to a main body, an opening and closing unit including a drive unit for generating rotational force by means of a motor and a door rotating mechanism for opening or closing the door, a device for measuring a back electromotive force generated from the motor, a power circuit connected for supplying power to the motor, a circuit for transmitting back electromotive force of the motor to the device, a control switch for selectively connecting the motor to the circuit or the power circuit, and a control unit for connecting the control switch to the power circuit when the motor is activated, and connecting the control switch to the circuit and opening or closing the door when the motor is deactivated, wherein the control unit closes the door when a predetermined back electromotive force is input to the device.

A drive device for a vehicle flap includes an electric motor (2) for driving the vehicle flap, and a supply switching circuit (3). The supply switching circuit (3) includes a first voltage source (9) for supplying current to the electric motor (2), a first electrical supply line (4) and a second electrical supply line (5). The first voltage source (9) is arranged between the first electrical supply line (4) and the second electrical supply line (5). The drive device also includes a control switching circuit (12) including a second voltage source (14) and a switching control device (13). The drive device includes a switching element (10) and a diode (11) connected between the first electrical supply line (4) and the second electrical supply line (5).

An emergency escape apparatus includes a support frame that is configured to be installed on a door or a wall and that defines an exit opening, an escape door that is located at an inner side of the exit opening and configured to open and close the exit opening and that defines an accommodation space, a driving unit located in the accommodation space and configured to rotate relative to the escape door, and an unlocking device that is located in the accommodation space, that is configured to be pushed by the driving unit, and that is configured to release coupling between the escape door and the support frame based on rotation of the driving unit. The driving unit is configured to be controlled by a control unit based on a sensor detecting an event.

The present invention relates to a method, a swing door system and a swing door operator (10) for moving a swing door leaf (20) between a closed and an open position (C, O), the swing door operator (10) comprising at least one drive unit (100), a control unit (200) and a sensor (300), the control unit (200) is operatively connected to the drive unit (100) and to the sensor (300) and configured to regulate the drive unit (100) to move the swing door leaf (20) between the closed and open position (C, O), wherein the sensor (300) is configured to identify an object (30) in a safety volume (400) in front of a first side (21) of the swing door leaf (20), the safety volume (400) comprising a first volume (401) and a second volume (402).

A port-door release assembly includes a door and a linkage coupled to the door to support the door during movement between open and closed positions. The port-door release assembly includes a drive shaft coupled to the linkage to drive movement of the linkage. The port-door release assembly includes a motor configured to rotate the drive shaft which moves the linkage and the door to the open and/or closed positions. The port-door release assembly includes a back-up release assembly movable relative to the linkage to disconnect the drive shaft from the linkage which allows the door to move to the open position without actuation of the motor. A door assembly includes the port-door release assembly as described above and a housing defining a port in which the door is movable relative to the housing between the open position that uncovers the port and the closed position that covers the port.

The invention concerns a drive unit for moving a door relative to a door's opening. The drive unit comprises a drive motor and a wheel transmission assembly arranged for transfer of power to a drive wheel configured for engagement with a running surface for moving the door. The wheel transmission comprises a transfer wheel driven by the drive motor. A movable wheel carrier comprises a first running wheel and a second running wheel arranged in in engagement with the transfer wheel. The movable wheel carrier is arranged for displacement between a free wheel position where the first and second running wheel are arranged disengaged from the drive wheel for no power transfer to occur from the drive motor to the drive wheel, at least one running position where either of the first and second running wheel is positioned in engagement with the drive wheel for the transfer of power from the drive motor to the drive wheel.

A drive carriage for a door, in particular garage door, comprising a body which is linearly shiftably mountable in a rail of a door drive, and a door driver pivotally mounted on the body, wherein a carriage driver which is shiftable relative to the body and is connectable with a power transmission means of the door drive, a latch mounted in the body via a flexible element and is pushable into a recess of the carriage driver by the flexible element, and a latching slide which urges the latch against the flexible element into an unlocking position in which the latch is not pushed into the recess by the flexible element, and which in a drive position permits pushing of the latch into the recess of the carriage driver by the flexible element in order to take a locking position in which the carriage driver is coupled with the body.

Hinged window drive systems and window assemblies incorporating them provide for a combination of powered or motorized operation in addition to manual operation using a hand crank, with the opportunity for a user to switch between motorized operation and manual operation as needed.

An automatic door device includes a driving motor and a transmission system. An input end of the transmission system is coupled to an output shaft of the driving motor, an output end of the transmission system is coupled to a door shaft, and the transmission system has a transmission link to transmit an output torque of the driving motor to the door shaft. A clutch mechanism is disposed on the transmission link of the transmission system. Accordingly, when the door is subjected to an external force, the transmission link between the door and the driving motor can be automatically disconnected, so that while an automatic door function implemented, it is ensured that a user may not be affected by the resistance brought by the automatic door device when the user opens/closes the door manually, thereby optimizing user experience.

A power transfer device for a fire door operator having a pair of drive gears includes a bridge gear box having a drive shaft suitable for being coupled to an external drive. An idle spur gear is fixed to the drive shaft. A pair of spur gears are coupled to the idle spur gear to rotate in response to rotations of the idle spur gear. Spur gear shafts are coupled to the spur gears and arranged to be coupled to the drive gears of the operator so that rotation of the drive shaft by an external drive is translated to simultaneous rotations of the drive gears of the operator.