Patents by Inventor Fredrick J. Arnoldt

Fredrick J. Arnoldt 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).

  • Automatic duct welding machine
    Patent number: 4639574
    Abstract: A welding gun of an arc welding machine is mounted for vertical reciprocal movement on a movable frame portion. The movable frame portion is connected to a stationary frame portion by piston cylinder assemblies which upon actuation raise and lower the movable frame portion into an out of position for locating the welding gun in position for welding together a pair of longitudinal sheet metal member edges positioned in a preselected relationship on the stationary frame portion. A pair of clamp plates are carried by the movable frame portion. When the movable frame portion is lowered the clamp plates are positioned oppositely of the pair of sheet member edges respectively to move into and out of clamping engagement with the sheet member edges. Once the sheet member edges are clamped in abutting relationship, the welding gun is advanced downwardly on the frame movable portion in a vertical linear path.
    Type: Grant
    Filed: October 19, 1984
    Date of Patent: January 27, 1987
    Assignee: Ductmate Industries, Inc.
    Inventors: Peter J. Arnoldt, Fredrick J. Arnoldt