Title: Method and apparatus for establishing the drilling line of an overhead boring machine

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.

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Inventors: Crane, Clayton H. (Mercer Island, WA, US)
Adami, Hans A. (Vashon, WA, US)

Application Number: 546604
Filing Date: 1975-02-03
Publication_date: 1976-12-28
Assignee: The Robbins Company (Seattle, WA)
Primary Class(es): 173/32 52/295, 173/36, 173/42, 248/654, 299/31
Other Classes:
US Patent Ref:

2716019	Aug, 1955	Shacikoski	173/36.
3220494	Nov, 1965	Cannon et al.	173/43.
3460638	Aug, 1969	Millsapp, Jr.	173/34.
3604754	Sep, 1971	Emden	175/94.
3659661	May, 1972	Young et al.	175/122.
3830318	Aug, 1974	Busby et al.	175/122.
3905426	Sep, 1975	Williams	299/31.

Other Refs: 1,081,845

May, 1960	DT

Primary Examiner: Purser, Ernest R.
Assistant Examiner: Pate, III, William F.
Attorney: Graybeal, Barnard & Uhlir