Barrier movement operator having obstruction detection

Details Barrier movement operator having obstruction detection Barrier movement operator having obstruction detection

2007-04-17

2007-04-17

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Motor-reversing

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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