Contact detecting device for positioning relatively movable elem

Details Contact detecting device for positioning relatively movable elem Contact detecting device for positioning relatively movable elem

1990-11-27

1993-10-19

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

219 6912, 219 6916, 219 6919, 324559, B23H 102

Patent

active

052548260

ABSTRACT:
A device for positioning a first and second conductive elements and, in particular, detecting contact at a gap therebetween without causing damage to either element. A pulse voltage, having a low duty, is applied to the gap. The occurrence of a contact is identified by a voltage drop at the gap, which is detected by comparing the gap voltage to a reference. A control circuit, comprising a flip-flop or one-shot operative in synchronism with the source of pulse voltage, generates a contact identification signal in response to the detection of a voltage drop at the gap.

REFERENCES:
patent: 3609281 (1971-09-01), Kauffman
patent: 4347425 (1982-08-01), Obara
patent: 4614854 (1986-09-01), Obara et al.
patent: 4654497 (1987-03-01), Obara
patent: 4678884 (1987-07-01), Obara et al.
patent: 4820895 (1989-04-01), Obara
patent: 4827213 (1989-05-01), Spaude
patent: 4833289 (1989-05-01), Obara
patent: 4862095 (1989-08-01), Yamamoto et al.

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