Safety device for elevator

Details Safety device for elevator Safety device for elevator

1988-07-14

1990-07-31

Leung, Philip H.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

361 76, B66B 502

Patent

active

049443690

ABSTRACT:
A safety device for an elevator which has a converter for converting a 3-phase A.C. power source into a D.C. power source, a control circuit for the elevator employing as a power source the D.C. power source outputted from the converter, a level converter for converting the voltage of the D.C. power source outputted from the converter into a logic level, and defective phase detecting means for detecting the defective phase of the 3-phase A.C. power source by dividing the output signal of the level converter in a time division manner.

REFERENCES:
patent: 3961688 (1976-06-01), Maynard
patent: 3999087 (1976-12-01), Compton
patent: 4021703 (1977-05-01), Gary et al.
patent: 4155427 (1979-05-01), Caputo et al.
patent: 4751653 (1988-06-01), Junk et al.
"Motor Technique in Field" issued by Ohn Co. by Akisuke Noguchi (Apr. 25, 1976) pp. 122-125. (partial translation).

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