Patent ID: 7193176
Filing Date: 2007-03-20
Classification: B23K

Abstract:
1. A safety interlock system for an arc welder, said safety interlock system comprising: an actuating circuit responsive to a command signal for turning on said arc welder, said command signal being produced by a user pressing a push switch, said actuating circuit having an output normally in an off condition and arranged to go to an on condition in response to said command signal, said output being interfaced with said arc welder to turn on said arc welder in said on condition; a timer to place said output in said on condition for a predetermined period of time whereafter said off condition is resumed; a latching circuit responsive to a parameter indicative of a welding operation underway, and adapted to maintain said arc welder operative until said parameter ceases, wherein said actuating circuit operates said output to go into said on condition only once for said predetermined period, and on resumption of said off condition, said push switch must first be released and re-pressed by the user before said actuating circuit will operate said output to again go to said on condition.