Patents Assigned to Production Technology Inc.
  • Length compensator for friction welding machines
    Patent number: 3998373
    Abstract: A device for controlling the rotational speed of a friction welder as a function of the combined length of the pair of parts to be welded, within predetermined tolerances, so as to produce welded pieces of uniform length in spite of minor variations in the lengths of the parts. Logic and sequencing circuitry specially adapted to carry out this function at minimum cost is also described.
    Type: Grant
    Filed: September 15, 1975
    Date of Patent: December 21, 1976
    Assignee: Production Technology Inc.
    Inventors: Thaddeus M. Jones, Edward L. Johnson, Jozef Kiwalle