Plural Adjustments Patents (Class 173/42)
Powered by motor or mechanism (Class 173/190)
  • Method and apparatus for establishing the drilling line of an overhead boring machine
    Patent number: 3999616
    Abstract: A bedplate is rigidly affixed relative to the tunnel floor and includes a centrally disposed shaft extending upwardly therefrom. A rotatable base member is mounted on the bedplate for rotation about the central shaft. A boring machine adapted to bore upwardly is secured to the rotatable base member. The boring machine is swung upwardly along a selected arc of vertical circle and the base member is rotated to a selected azimuth. Following rotation, the rotatable base member is itself rigidly affixed relative to the tunnel floor.
    Type: Grant
    Filed: February 3, 1975
    Date of Patent: December 28, 1976
    Assignee: The Robbins Company
    Inventors: Clayton H. Crane, Hans A. Adami