Barrier movement operator having obstruction detection

Electricity: motive power systems – Motor-reversing

Reexamination Certificate

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C318S266000, C318S268000, C318S280000, C318S282000, C318S286000, C318S466000, C318S468000

Reexamination Certificate

active

10760069

ABSTRACT:
A barrier movement operator which uses an A.C. motor to move a barrier is disclosed herein. The operator senses a characteristic of barrier movement, such as motor rotation speed, to detect when the barrier contacts an obstruction. The motor and/or the circuitry for applying electrical power to the motor have been enhanced to improve the detectibility of contact with an obstruction.

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patent: 6952087 (2005-10-01), Lamm
patent: 2005/0012488 (2005-01-01), Fitzgibbon et al.
International Search Report, dated Aug. 27, 2004, in PCT application PCT/US04/01157.

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