Primer centering device for large diameter blastholes

Details Primer centering device for large diameter blastholes Primer centering device for large diameter blastholes

1989-05-12

1990-10-09

Jordan, Charles T.

Ammunition and explosives

Blasting

Contained blasting charge

86 2015, 89 115, F42B 326, F42B 3182

Patent

active

049613812

ABSTRACT:
An improved method for reducing misfires in large diameter unlined blastholes by fitting on the primer used in the blasthole a centering device comprised of a semi-conducting plastic material.

REFERENCES:
patent: Re31953 (1985-07-01), Calder, Jr. et al.
patent: 1218140 (1917-03-01), Weber
patent: 1526274 (1925-02-01), Fitzsimons et al.
patent: 1560815 (1925-11-01), Hill
patent: 2923238 (1960-02-01), Albon et al.
patent: 3276371 (1966-10-01), Newman et al.
patent: 3357355 (1967-12-01), Roush
patent: 4248303 (1981-02-01), Charpentier

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