Safety device for elevator

Details Safety device for elevator Safety device for elevator

1991-05-01

1992-01-28

Pellinen, A. D.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 89, B66B 500

Patent

active

050836340

ABSTRACT:
A safety device for an elevator which detects a trouble of the control device quickly to apply an emergency brake, thereby to ensure the safety of the people in the cage. The elevator safety device is so designed that the harmonic wave component produced by an inverter is detected with the aid of a band-pass filter, and when the harmonic wave component thus detected becomes abnormal, an emergency stop instruction is produced.

REFERENCES:
patent: 3601227 (1971-08-01), Burch
patent: 4256204 (1981-03-01), Ando et al.
patent: 4923055 (1990-05-01), Holland

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