Abstract: An operator ratchet mechanism for effecting reciproctable lateral movement if an element of a geared drive train in a door, gate or barrier operator. The operator ratchet mechanism can be utilized to cause disconnection between the geared drive train and an electric motor of the door gate or barrier operator to enable the door gate or barrier to me manually moved, and subsequent reconnection between the geared drive connection and electric motor. An embodiment of a tilt door operator which enables disconnection and reconnection between a geared drive train and an electric motor of the operator by effecting lateral displacement of an element of the geared drive train is also disclosed.

Abstract: A obstruction beam protection system for sensing an object in the path of the door during closing of the door by a door operator and for inhibiting operation for closing of the door. The beam protection system comprises a beam transmitter and beam receiver for positioning proximate to a passageway to be closed by the door, so as, when in use, to project a beam from the beam transmitter across the passageway to be receivable by the beam receiver. The beam transmitter and the beam receiver are provided with a local communication system for communication with an operator communication system associated with the operator. The beam transmitter and the beam receiver are both adapted to operate in a low power sleep state and a wake state.