Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel
Reexamination Certificate
2007-02-06
2007-02-06
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Automatic and/or with time-delay means
Movement, position, or limit-of-travel
C318S280000, C318S281000, C318S282000, C318S283000, C318S432000, C318S434000, C318S445000, C318S466000, C049S026000, C049S028000
Reexamination Certificate
active
10875408
ABSTRACT:
A motorized barrier operator system that moves a barrier between limit positions includes a barrier, a motor coupled to the barrier and adapted to move the barrier between a full open limit position, a danger zone position, and a full close position. The system further includes a position sensor coupled to one of the barrier and the motor to detect the positions, and a force sensor coupled to one of the barrier and the motor to detect an actual force value during movement of the barrier. A controller is connected to the sensors which determines a first threshold response value between the full open limit position and the danger zone position, and a second threshold response value between the danger zone position and the full close limit position. The second threshold response value is less than the first threshold response value, and the controller commands the motor to at least stop movement of the barrier if the actual force value is greater than either of the threshold response values.
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Donovan Lincoln
Glass Erick
Renner Kenner Greive Bobak Taylor & Weber
Wayne-Dalton Corp.
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