Patents Assigned to The Fourth Dimension, Inc.
  • Automatic welder's helmet
    Patent number: 4694141
    Abstract: An improved automatic welder's helmet having two pneumatic cylinders to effect the closing of the helmet's dark eye lens prior to energizing the welding system for striking the welding arc, and further to maintain the dark eye lens closed until after the arc and the weldment's white afterglow have ceased. Additionally, the invention includes a ventilation system manually controlled to ventilate the helmet and to remove welding fumes and smoke from the interior of the helmet and the dark eye lens.
    Type: Grant
    Filed: October 31, 1986
    Date of Patent: September 15, 1987
    Assignee: The Fourth Dimension, Inc.
    Inventor: Lawrence R. Hahn