Dennis L Robbins

US Patent:

20030223163, Dec 4, 2003

Filed:

May 22, 2003

Appl. No.:

10/443403

Inventors:

Dennis Robbins - Kent WA, US

International Classification:

H02H003/00

US Classification:

361/042000

Abstract:

A control system is interposed between the input terminal () and the output terminal () of a welding machine (). An electrical conductor () is connected to the input terminal. A ground conductor () extends out from the housing () of the welding machine (). An electrode conductor () extends from the output terminal () to an electrode holding device (). An electrode () is held by the electrode holder (). The control circuit includes means for connecting welding voltage to the electrode holding device () and the electrode () when the electrode () is connected to a grounded workpiece (). A control circuit also connects the electrode holding device () and the electrode () to a lower, safe voltage, when the electrode () is disconnected from the grounded workpiece (). As a result, the welder is protected from electrical shocks when the electrode () is disconnected from the grounded workpiece (). The control circuit is characterized by one, two, three or more SCRs.

US Patent:

40513440, Sep 27, 1977

Filed:

Apr 28, 1975

Appl. No.:

5/572381

Inventors:

Dennis R. Robbins - Seattle WA

International Classification:

B23K 910

US Classification:

219132

Abstract:

The control unit comprises an elongated body having a forward torch mounting portion. Rearwards of the torch the body houses a linear potentiometer which includes an upstanding control arm for its movable contact. An off-on switch is located within said body, in a position to be contacted and operated by the control arm. A thumb button controlled sliding control member is attached to the control arm. In use, the user grips the mid portion of the body and places his thumb on the thumb button. He uses a simple linear movement of his thumb to both control the linear potentiometer, for varying the welding current, and to operate the off-on switch, for turning the arc welding machine on and off.