Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel
Reexamination Certificate
2007-02-20
2007-02-20
Masih, Karen (Department: 2837)
Electricity: motive power systems
Automatic and/or with time-delay means
Movement, position, or limit-of-travel
C318S468000, C318S469000
Reexamination Certificate
active
11358016
ABSTRACT:
A barrier operator includes a drive motor and a controller for causing the motor to move the barrier between open and closed positions and for monitoring parameters related to forces acting on the barrier during movement thereof. If no external entrapment device is connected to the controller, the controller automatically sets maximum control limit values which will effect stopping or reversing of the motor if an obstruction is encountered by the barrier. If an external entrapment device is connected to the controller, the controller requires a user to set the control limit values at least for movement of the barrier from an open position to a closed position. Audio or visual signal indicators associated with the controller alert the user to the requirement to set the control limits before the operator will effect movement of the barrier.
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Murphy Larry D.
Theile Ulrich
Gardere Wynne & Sewell LLP
Overhead Door Corporation
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