Patents Assigned to Akio Hirane
  • Spot welding apparatus
    Patent number: 5866868
    Abstract: An object to the invention is to narrow the region burned by the preheating current at the spot welding. Structure is provided for allowing conventional welding current to be flowed between a first welding electrode tip and a contact member intermittently via an electronic switch until a predetermined current starts to flow between a first welding electrode tip and a second welding electrode tip.
    Type: Grant
    Filed: June 24, 1997
    Date of Patent: February 2, 1999
    Assignee: Akio Hirane
    Inventor: Akio Hirane