Roof drilling system

Details Roof drilling system Roof drilling system

1977-01-19

1978-07-11

Purser, Ernest R.

Boring or penetrating the earth

With tool shaft detail

285404, 175418, 175410, 403324, 403378, E21B 1700

Patent

active

040995852

ABSTRACT:
A roof drilling system which includes a drill bit with a hollow driven shank and coolant holes in the bit flutes connected to the inside of the hollow shank, a single driver unit connectible to the drill bit and also to extension driver elements which interfit with both the bit and the driver, all of the elements being hollow and connected by retainers which secure the parts during the drilling and aid in the withdrawal from the drilled hole.

REFERENCES:
patent: 1136987 (1915-04-01), Wakfer
patent: 1632386 (1927-06-01), Waters
patent: 2398532 (1946-04-01), Keehn
patent: 2845203 (1958-07-01), Potash
patent: 3415332 (1968-12-01), Bower, Jr.
patent: 3434554 (1969-03-01), Bower, Jr.
patent: 4019590 (1977-04-01), Hansen et al.

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