Ammunition and explosives – Blasting – Borehole loading
Patent
1983-01-07
1983-12-13
Nelson, Peter A.
Ammunition and explosives
Blasting
Borehole loading
102312, 86 20C, 175 457, 299 13, F42B 300
Patent
active
044199350
ABSTRACT:
An explosive charging apparatus for charging explosive pellets to a bore drilled in a rock. The apparatus includes a body having coaxial pellet guiding first and second bores, the second bore being provided with a pellet supplying port. A cylinder is provided and has a piston with its rod extending into the second bore to force the pellet therein when the rod is advanced under an air pressure supplied to the cylinder. The rod is formed with an axial air passage opened to the second bore and adapted to be connected with a pressurized air source when the rod is advanced so as to supply air pressure to the second bore to thereby drive the explosive pellet to the first bore. The first bore is supplied with a lower air pressure which functions to feed the pellet in the first bore to the bore in the rock. The cylinder is associated with a pilot operated valve which receives a returning pilot pressure when the piston is fully advanced and an advancing pilot pressure when the piston is fully retracted.
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patent: 3180221 (1965-04-01), Porter
patent: 3232168 (1966-02-01), Mangeng et al.
patent: 3721471 (1973-03-01), Bergmann et al.
patent: 3996836 (1976-12-01), Lichtenberg
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patent: 4077670 (1978-03-01), Spies et al.
patent: 4088368 (1978-05-01), Lavon et al.
patent: 4289354 (1981-09-01), Zakiewicz
Nelson Peter A.
Toyo Kogyo Co. Ltd.
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