Patents Assigned to Southern Iowa Manufacturing Co.
  • Rotary drilling device with pivoting drill head assembly
    Patent number: 4262754
    Abstract: In a rotary drilling device for powering a drill string into subterranean strata and having a vertically alignable drill mast, a drill head assembly for applying rotational movement to the drill string, elevational means on which the head assembly is mounted on said mast for vertical movement thereon, and with the head assembly including a support housing for a rotary drive unit pivotally movable from an operating position in alignment with the drill string to a pivoted position out of such alignment.
    Type: Grant
    Filed: May 15, 1979
    Date of Patent: April 21, 1981
    Assignee: Southern Iowa Manufacturing Co.
    Inventor: Ivan L. Nelson