Mining or in situ disintegration of hard material – Processes – Explosive
Patent
1994-10-20
1995-12-12
Bagnell, David J.
Mining or in situ disintegration of hard material
Processes
Explosive
102319, 299 16, E21C 3714, F42D 122, F42D 304
Patent
active
054743648
ABSTRACT:
A rock breaker uses shotgun cartridges or other firearm ammunition as the explosive charge at the bottom of a drilled borehole. The breaker includes a heavy steel rod or bar, a gun with a firing chamber for the ammunition which screws onto the rod, a long firing pin running through a central passage in the rod, and a firing trigger mechanism at the external end of the bar which strikes the firing pin to fire the cartridge within the borehole. A tubular sleeve surround the main body of the rod and includes slits the end to allow it to expand. The rod has a conical taper at the internal end against which the end of the sleeve expands when the sleeve is forced along the rod toward the taper by a nut threaded onto the external end of the rod. As the sleeve end expands, it pushes against the borehole and holds the explosive gasses within, and also prevents the breaker from flying out of the borehole. The trigger mechanism includes a hammer with a slot and a hole for accepting a drawbar or drawpin which, when pulled by a long cord, allows the cartridge to be fired from a remote location.
REFERENCES:
patent: 921144 (1909-05-01), McGregor
patent: 1571122 (1926-01-01), Hutton
patent: 2866508 (1958-12-01), Church
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patent: 4185702 (1980-01-01), Bullard
patent: 4470352 (1984-09-01), Leperre
patent: 4492165 (1985-01-01), Marz
patent: 4572075 (1986-02-01), Day
patent: 4900092 (1990-02-01), Westhuizen
patent: 5308149 (1994-05-01), Watson
Morrell Roger J.
Ruzzi Peter L.
Bagnell David J.
Koltos E. Philip
The United States of America as represented by the Secretary of
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