Plasma arc torch disconnect and visible indicia means

Details Plasma arc torch disconnect and visible indicia means Plasma arc torch disconnect and visible indicia means

1988-09-23

1989-08-29

Paschall, M. H.

Electric heating

Metal heating

By arc

21912154, 21912157, 2191304, B23K 906

Patent

active

048619639

ABSTRACT:
In a plasma arc torch having an elongated nozzle with an arc constricting orifice of predetermined diameter and electrical control circuit for regulating the operation of the plasma arc torch, there is provided a visible indicia or light associated with an operator control to assist the operator in the safe operation of the torch. The visible indicia or light includes a by-pass control circuit for energizing the visible indicia or light when the operator control is disconnected. If the torch gets too hot, torch operation is prevented by a thermal disconnect. The visible indicia or light will not be illuminated when the operator control is disconnected, so that the operator will know that the torch is too hot to operate. When the torch cools down, the operator control is disconnected, the visible indicia or light will again be illuminated, indicating that normal operation can be resumed.

REFERENCES:
patent: 4125754 (1978-11-01), Wasserman et al.
patent: 4371775 (1983-02-01), Mihara et al.
patent: 4700315 (1987-10-01), Blackburn et al.

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