Patents by Inventor Rolf Ericsson

Rolf Ericsson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Pulsed-arc D.C. TIG welding apparatus
    Patent number: 4246465
    Abstract: An arc welding apparatus for pulsed arc welding includes a silicon controlled rectifier and an uncontrolled rectifier the D.C. outputs of which are connected in parallel to a non-consumable electrode and a workpiece, respectively. The silicon controlled rectifier delivers a background welding current to the arc between the electrode and the workpiece. The D.C. outputs of the uncontrolled rectifier are connected in series with transistors controlled by signals to regulate the flow of current supplied from this rectifier to the arc to provide periodically recurring welding current pulses of predetermined length and amplitude to the arc in addition to the background welding current delivered by the silicon controlled rectifier.
    Type: Grant
    Filed: February 21, 1978
    Date of Patent: January 20, 1981
    Assignee: ESAB Aktiebolag
    Inventor: Rolf Ericsson
  • Direct current power supply for manual arc welding
    Patent number: 3961154
    Abstract: A direct current power supply for manual arc welding having a steeply drooping, adjustable characteristic, comprising a polyphase transformer and a polyphase rectifier system including triggered rectifier means and a control system therefor providing both welding current and welding voltage feed-back. The welding current feed-back is substantially fixed. The welding voltage feed-back is adjustable for adjustment of the slope of the characteristic.
    Type: Grant
    Filed: October 16, 1974
    Date of Patent: June 1, 1976
    Assignee: Elektriska Svetsningsaktiebolaget
    Inventor: Rolf Ericsson
  • Direct current power supply for manual arc welding
    Patent number: RE29400
    Abstract: A direct current power supply for manual arc welding comprising a polyphase transformer, a polyphase rectifier system including triggered rectifier valves, and a control system therefor which comprises means for setting the output current level by adjustment of a reference signal, means providing negative feed-back of the output voltage and the output current, and means for adjusting the slope of the characteristic by adjustment of the proportion between the amounts of feed-back of the voltage and the current. The current level setting means and the slope adjustment means are linked with each other to provide automatically a desired correlation between the slope and the current setting.
    Type: Grant
    Filed: May 17, 1976
    Date of Patent: September 13, 1977
    Assignee: Elektriska Svetsningsaktiebolaget
    Inventor: Rolf Ericsson
  • Direct current power supply for manual arc welding
    Patent number: RE29441
    Abstract: A direct current power supply for manual arc welding having a steeply drooping, adjustable characteristic, comprising a polyphase transformer and a polyphase rectifier system including triggered rectifier means and a control system therefor providing both welding current and welding voltage feed-back. The welding current feed-back is substantially fixed. The welding voltage feed-back is adjustable for adjustment of the slope of the characteristic.
    Type: Grant
    Filed: August 23, 1976
    Date of Patent: October 11, 1977
    Assignee: Elektriska Svetsningsaktiebolaget
    Inventor: Rolf Ericsson