Control circuit for a motor-driven door operator
First Claim
1. In a door operator including a drive mechanism connectable to a door and actuable to move the door in either direction between an open position and a closed position, a selectively energizable reversible motor connected to the drive mechanism for actuating the drive mechanism to move the door between the open and closed position and a selectively activated control circuit connected to a power supply and to the motor for energizing the motor, the improvement in the control circuit comprising:
- a down limit switch activated as the door closes near the closed position,an up limit switch activated as the door opens near the open position,a selectively activated control switch for activating the control circuit; and
maximum run-time circuitry connected to the down and up limit switches and to the control switch for changing the operational mode of the motor if energization of the motor continues after a maximum predetermined time elapses following activation of the control circuit, the maximum run-time circuitry being operable when de-energization of the motor is normally influenced by the up and down limit switches to change the operational mode of the motor in the event one of the up and down limit switches fails.
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Accused Products
Abstract
A door operator includes a motor-driven mechanism to move a door between an open position and a closed position in response to activation of an improved control circuit. The improved control circuit includes circuitry to initialize the sequence of operation of the motor upon connection of power after installation of the door operator or upon restoration of power after a power outage. Obstruction detection circuitry is also included in the control circuit to stop or reverse the motor if the door encounters an obstacle during movement between the open and closed positions. Time delay circuitry cooperates with the obstruction detection circuitry so as to prevent stopping or reversing the motor due to the inertia of the door and of the drive mechanism as the door starts to open or close upon activation of the control circuit. During the time delay period, however, further manual activation of the control circuit is operative to stop and/or reverse movement of the door. As the door moves in one direction, movement can be stopped and restarted in the opposite direction upon consecutive manual activations of the control circuit. When the door nears the closed position, timer circuitry is activatd to energize the motor for a predetermined time or until sufficient resistance to door movement is met to activate the obstruction detection circuitry whereupon the motor is stopped. Maximum run-time circuitry is also included to set the maximum time allowable for energization of the motor to move the door in either direction between the open and closed positions.
52 Citations
8 Claims
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1. In a door operator including a drive mechanism connectable to a door and actuable to move the door in either direction between an open position and a closed position, a selectively energizable reversible motor connected to the drive mechanism for actuating the drive mechanism to move the door between the open and closed position and a selectively activated control circuit connected to a power supply and to the motor for energizing the motor, the improvement in the control circuit comprising:
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a down limit switch activated as the door closes near the closed position, an up limit switch activated as the door opens near the open position, a selectively activated control switch for activating the control circuit; and maximum run-time circuitry connected to the down and up limit switches and to the control switch for changing the operational mode of the motor if energization of the motor continues after a maximum predetermined time elapses following activation of the control circuit, the maximum run-time circuitry being operable when de-energization of the motor is normally influenced by the up and down limit switches to change the operational mode of the motor in the event one of the up and down limit switches fails. - View Dependent Claims (2, 3, 4, 5)
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6. A method for controlling a door operator including a drive mechanism connectable to a door and actuable to move the door in either direction between an open position and a closed position, a selectively energizable reversible motor connected to the drive mechanism for actuating the drive mechanism to move the door between the open and closed positions and a control circuit connected to a power supply and to the motor for energizing the motor, the control circuit including a down limit switch activated as the door closes near the closed position, an up limit switch activated as the door opens near the open position and a selectively activated control switch for activating the control circuit, the method including the step of:
changing the operational mode of the motor if energization of the motor continues after a maximum predetermined time elapses following activation of the control circuit, when de-energization of the motor is normally influenced by the up and down limit switches, in the event one of the up and down limit switches fails. - View Dependent Claims (7, 8)
Specification