Patent ID: 8479446

Claim:
A drive system for a gate having a gate panel that is guided on a side of the gate panel along a guide rail, the drive system comprising: a carriage guided along the guide rail; a push-arm having opposite ends and being articulated, adjacent one of the opposite ends, to the carriage and articulated, adjacent the other of the opposite ends, to the gate panel; a motor positioned on the push-arm, the motor including a shaft and a chain wheel mounted on the shaft; a fraction mechanism comprising a chain extending along the guide rail and engaging the chain wheel, the chain wheel being driven by the motor to thereby move the carriage along the chain to open or close the gate; and a manually operable emergency release comprising a motor mount to which the motor is secured, the motor mount being connected to the push-arm by a rotating bearing and a locking element releasably engaged in an opening in the push-arm, wherein when the locking element is released from the opening the motor together with the motor mount is pivoted downwardly about the rotating bearing to thereby disengage the chain wheel from the chain.