B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
364/27
B66B 1/24 (2006.01) B66B 1/36 (2006.01) B66B 5/00 (2006.01) B66B 5/02 (2006.01) B66B 5/06 (2006.01)
Patent
CA 1191633
ABSTRACT OF THE DISCLOSURE An elevator system having an elevator car, a DC drive motor for driving the elevator car, an adjustable voltage DC source for the drive motor, overvoltage and overacceleration detectors responsive to the armature voltage of the drive motor, test apparatus for testing the operability of the detectors during each run of the eleva- tor car, and a protective circuit. The protective circuit initiates an emergency stop of the elevator car in response to overvoltage, or overacceleration, and it prevents the elevator car from starting a new run when the test appara- tus detected a malfunction during the prior run.
428666
Husson Alan L.
Uherek Vladimir
Oldham And Company
Westinghouse Electric Corporation
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