| 摘要 |
A floor mounted door actuator unit 1 for a swing door 24, comprising: a chassis 7 supported by a floor; a drive spindle 9 rotatably mounted on the chassis, the spindle 9 engaging and supporting a door 24 for rotation of the door about the spindleâ s 9 axis of rotation; an electric motor 16a; a controller 16b for the motor; a first pulley 20 coaxially arranged with and engaged with the spindle; a second pulley 17 connected to the motor; at least one drive belt 18, 19 for connecting the motor 16a to the first pulley 20 so that operation of the motor 16a causes the first pulley to rotate the spindle 9; and a torsion spring 21. Operation of the motor 16a drives door 24 connected to spindle 9 from a first position to a second position against the action of the spring 21 and the spring 21 can return the door 24 to the first position if the motor controller 16b should fail. The torsion spring may be a spiral or helical spring wound around a pulley axis. The unit may have a learning mode, learning from temporary physical stop positions and subsequently allowing movement between the learnt positions. |
