Abstract: An operator for a movable barrier includes an output drive to transfer drive to the movable barrier. The output drive comprises a rotating crown wheel with an outer face carrying a plurality of shaped attachment portions, each attachment portion configured to receive an output drive extension element to engage with a drum wheel of the movable barrier. The operator further includes first and second output drive extension elements of a different size and shape, each first and second output drive extension element comprising a base portion and an elongated extension portion. The base portion is sized and shaped to be received by one or more of the outer face shaped attachment portions. Selection of the at least one first or second output drive extension element for attachment to the rotating crown wheel is made in accordance with one or more physical characteristics of the particular drum wheel.

Abstract: An operator for a movable barrier includes an output drive to transfer drive to the movable barrier. The output drive comprises a rotating crown wheel with an outer face carrying a plurality of shaped attachment portions, each attachment portion configured to receive an output drive extension element to engage with a drum wheel of the movable barrier. The operator further includes first and second output drive extension elements of a different size and shape, each first and second output drive extension element comprising a base portion and an elongated extension portion. The base portion is sized and shaped to be received by one or more of the outer face shaped attachment portions. Selection of the at least one first or second output drive extension element for attachment to the rotating crown wheel is made in accordance with one or more physical characteristics of the particular drum wheel.

Abstract: The invention provides an operator for a roller closure. The operator includes an output drive comprising a rotating crown wheel. The crown wheel is configured to receive for attachment at least one output drive extension element selected from at least one first output drive extension element of a first size and shape or at least one second output drive extension element of a second, different size and shape, based on one or more physical characteristics of the particular drum wheel of the roller closure.

Abstract: The invention concerns an operator assembly for a movable barrier. The operator assembly includes a motor with a motor output shaft, an output drive to transfer drive to the movable barrier, and a transmission assembly to transfer drive from the motor output shaft to the output drive. The output drive is rotatable in a clockwise direction and in a counterclockwise direction, depending on whether the movable barrier is closing or opening. The output drive comprises a crown wheel rotatable about an output drive axis centre of rotation and having an outer face provided with a plurality of attachment points spaced from said centre of rotation.

Abstract: The invention provides an operator assembly for a movable barrier comprising a roller closure, the roller closure mounted on a rotating carrier assembly, the operator assembly including a motor with a motor output shaft, an output drive to transfer drive to the movable barrier, and a transmission assembly to transfer drive from the motor output shaft to the output drive, the output drive rotatable in a clockwise direction and in a counterclockwise direction, depending on whether the movable barrier is closing or opening, wherein the output drive comprises a rotating crown wheel with an outer face carrying a plurality of shaped attachment portions, each attachment portion configured to receive an output drive extension element to engage with a drum wheel comprised in said rotating carrier assembly, the operator assembly including at least one first output drive extension element of a first size and shape and at least one second output drive extension element of a second, different size and shape, each first an