Roof drill system

Details Roof drill system Roof drill system

1985-06-03

1986-12-30

Leppink, James A.

Boring or penetrating the earth

With tool shaft detail

279103, 403348, 403383, E21B 1700

Patent

active

046321950

ABSTRACT:
An automatic drive lock drill system for roof drilling with a bit and drill steel components which are assembled axially one by one in telescoping relationship when the acircular drive shank on one part is inserted into an acircular recess in an adjacent part. The drive shank on each component has a series of radial lobes on the corners of the acircular part which are spaced at a set location from the end of the shank and will fit into the recess grooves and undercut ribs of the adjoining part and when rotated in either drive or reverse direction, each lobe of each male shank will automatically interlock on an axial plane, when rotated from an insertion orientation to a drive orientation.

REFERENCES:
patent: 1593561 (1926-07-01), Bayles
patent: 3187825 (1965-06-01), Bower, Jr.
patent: 4099585 (1978-07-01), Emmerich
patent: 4189013 (1980-02-01), Adams et al.
patent: 4454922 (1984-06-01), Jamison et al.
patent: 4532672 (1985-08-01), Anderson

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