Elevator control having independent safety circuits

Details Elevator control having independent safety circuits Elevator control having independent safety circuits

2007-02-20

2007-02-20

Salata, Jonathan (Department: 2837)

Elevator, industrial lift truck, or stationary lift for vehicle

Having independent supports carrying distinct loads and...

C187S391000, C187S314000

Reexamination Certificate

active

11258594

ABSTRACT:
An elevator installation with at least one shaft having a plurality of shaft doors is provided. At least two cars disposed one above the other travel up and down in the shaft. Each car has at least one car door. A safety device is provided for blocking the travel of the cars when the shaft doors or car doors are open. The safety device has at least two independent safety circuits, each having at least one shaft door and/or car door associated with it. Travel of at least one car can be blocked by means of the safety circuits.

REFERENCES:
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patent: 5817994 (1998-10-01), Fried et al.
patent: 6173814 (2001-01-01), Herkel et al.
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patent: 6603398 (2003-08-01), Tinone et al.
patent: 6732839 (2004-05-01), Schuster
Patent Abstracts of Japan, vol. 2003, No. 01, Method and Device for Controlling Operation of Elevator System, Publication No. 2002255460, Publication Date Sep. 11, 2002.

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