Capacitively coupled machine tool safety having a self-test netw

Details Capacitively coupled machine tool safety having a self-test netw Capacitively coupled machine tool safety having a self-test netw

1982-02-02

1985-05-21

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

192130, 340540, G08B 2100

Patent

active

045189587

ABSTRACT:
A machine tool safety system includes an electric field generator capacitively coupled to a receptor antenna. A self-test network includes a self-test radiating antenna and a circuit arrangement operative to apply a test signal to the self-test antenna. The test signal may be of sufficient strength to induce in the receptor antenna a first excitation signal having a magnitude greater than a first predetermined threshold to verify that the safety system is operative to detect the entry of the field generator carried on an operator's person into a hazard zone proximal to the machine tool. The test signal may be of sufficient strength to induce a second excitation signal greater than a second threshold to verify that the safety system is operative to detect the entry of the field generator into an arming zone spaced from the hazard zone.

REFERENCES:
patent: 1847872 (1932-03-01), Hand
patent: 3409842 (1968-11-01), Embling et al.
patent: 3872455 (1975-03-01), Fuller et al.
patent: 3896425 (1975-07-01), Erichsen
patent: 3950755 (1976-04-01), Westbrook, Sr.
patent: 3983483 (1976-09-01), Pando
patent: 4057805 (1977-11-01), Dowling
patent: 4075961 (1978-02-01), Harris
patent: 4095214 (1978-06-01), Minasy

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