Boring or penetrating the earth – Processes
Patent
1981-05-01
1982-07-13
Purser, Ernest R.
Boring or penetrating the earth
Processes
175320, E21C 100, E21B 1704
Patent
active
043390064
ABSTRACT:
A method and apparatus for drilling bolt holes in a mine roof is described. The drill head of a roof bolting drill is provided with a deep chuck adapted to receive the lower male end of a conventional drill steel driver. In a drilling operation, a drill bit is connected to the upper female end of a drill steel driver, with the lower male end of the driver being connected to the deep chuck of the roof bolting drill. The drill bit is rotated and raised enabling it to bore a hole into the mine roof. Drilling continues until the drill steel driver is at least partially disposed within the bolt hole whereupon the driver is disconnected from the deep chuck. The drill is then lowered so that the lower male end of a second identical drill steel driver may be connected to the deep chuck, while the upper female end of the second drill steel driver is connected to the lower male end of the first drill steel driver enabling the drilling to continue. By adding additional drill steel drivers in this manner, a hole may be drilled to the desired depth.
REFERENCES:
patent: 1760316 (1930-05-01), Osgood
patent: 2407976 (1946-09-01), Curtis et al.
patent: 3902561 (1975-09-01), Friberg et al.
patent: 4019590 (1977-04-01), Hansen et al.
patent: 4177894 (1978-10-01), Saunders
Bower, Jr. Arnold B.
Ojanen Randall W.
General Electric Company
Purser Ernest R.
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