Method and apparatus for establishing the drilling line of an ov

Details Method and apparatus for establishing the drilling line of an ov Method and apparatus for establishing the drilling line of an ov

1975-02-03

1976-12-28

Purser, Ernest R.

Tool driving or impacting

With work engaging means supporting drive

Anchored to work

52295, 173 36, 173 42, 248 23, 299 31, E21D 106, E21C 1100

Patent

active

039996166

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.

REFERENCES:
patent: 2716019 (1955-08-01), Shacikoski
patent: 3220494 (1965-11-01), Cannon et al.
patent: 3460638 (1969-08-01), Millsapps, Jr.
patent: 3604754 (1971-09-01), Emden
patent: 3659661 (1972-05-01), Young et al.
patent: 3830318 (1974-08-01), Busby et al.
patent: 3905426 (1975-09-01), Williams

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