Safety circuit, especially for elevators and the like

Details Safety circuit, especially for elevators and the like Safety circuit, especially for elevators and the like

1976-05-19

1978-05-09

Schaefer, Robert K.

Electrical transmission or interconnection systems

Miscellaneous systems

3072021, H02J 1300

Patent

active

040889009

ABSTRACT:
A safety circuit arrangement, especially for transportation systems such as elevators, comprising at least one switching circuit equipped with two digital logical elements, each arranged in a separate information channel and connected at its input side with anti-valent signal generating information transmitters and at its output side with a monitoring circuit monitoring the anti-valence of the output signals. A control line for switching-off the installation in the presence of equivalence. A logical element of the monitoring circuit which is connected at its output side with the control line exclusively comprises diodes and input side logical elements of such monitoring circuit and the monitored digital logical elements are connected with a testing circuit which, upon placing into operation the elevator, applies a test signal simulating a defect in succession to both monitored digital logical elements. There is further provided a timing element having a switching-in time-delay connected in the control line for switching-off the elevator.

REFERENCES:
patent: 3961688 (1976-06-01), Maynard

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