Door safety circuit for monitoring of story doors in lift instal

Details Door safety circuit for monitoring of story doors in lift instal Door safety circuit for monitoring of story doors in lift instal

1994-10-05

1997-04-01

Nappi, Robert

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific load support drive-means or its control

Includes control for power source of drive-means

187317, 187393, 187391, B66B 128, B66B 134, B66B 300

Patent

active

056168950

ABSTRACT:
A door safety circuit for monitoring of story doors in lift installations. The door safety circuit includes a transmitter that produces a non-electrical signal which is guided by a series of conductor portions. The non-electrical signal may be transmitted through a first conductor partial portion to a latching device of a first story door, depending upon the latched state of the first story door, the signal may be either transmitted to a second conductor partial portion, which may be included within the latching device, or no longer transmitted. If the signal is similarly transmitted through a plurality of conductor partial portions and serially connected story door latching devices, the circuit may indicate that each story door is properly latched. The circuit may also include a plurality of sensors coupled to a failure recognition circuit for monitoring each conductor partial portion.

REFERENCES:
patent: 4009767 (1977-03-01), Stadigh
patent: 4623869 (1986-11-01), Marubashi
patent: 5107964 (1992-04-01), Coste et al.
patent: 5509505 (1996-04-01), Steger et al.

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