§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US3709149A Expired / Lapsed US ⏱️ 0.0 years remaining

Detonator assembly, and booster and blasting system containing same

Assignee: Ireco Inc
•
Filing: 1970-03-20
•
Granted: 1973-01-09
•
Expires: 1990-03-20
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A non-electrically initiated detonator assembly comprising a shell containing an impact-sensitive ignition composition, and a detonator cord disposed outside the shell for detonation to provide, and direct, resulting explosive energy into the shell for percussion initiation of the ignition composition. In preferred practice, the shell is closed by an empty primed rifle cartridge casing and the detonator cord is supported in operative relationship with the primer end of the casing. Also provided is an non-electrically initiatable detonator assembly containing the impact-sensitive charge and including means for support of the detonator cord in the requisite detonating relationship. Further provided is a booster unit containing a detonator assembly above described; and a pattern shooting system containing a plurality of the booster assemblies and providing for reduced above-the-ground trunk line noise, eliminating need heretofore for delay means in the down line(s) and providing for assembly of a plurality of boosters in each bore hole on a single down line.

Inventors

  • 👤 H Driscoll

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 21:45
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 116 words
An explosive assembly comprising a mass of main explosive charge; a plurality of booster charges and a separate delay type detonator for each, spaced apart in said main explosive; detonator cord means for initiating said detonators, extending in said explosive mass, and means for detonating said cord means; each said detonator comprising a closed shell containing base charge, primer, delay and impact-sensitive ignition compositions spaced from each other in that order, and operatively responsive to impact-ignition of said ignition composition to detonate said base charge, and thereby detonate said booster; and said cord initiating means supported outside said shell for detonation to provide, and direct, resulting explosive energy to said ignition composition for said impact ignition.
Claim 2
Dependent Claim 66 words
In an explosive assembly of claim 2 an elongated closed shell containing said base charge, primer, delay and impact-ignition compositions spaced from one end of the shell in that order, an empty primed rifle cartridge casing extending, open end first, into said shell through the opposite end thereof, and the primer end of said cartridge casing containing the primer charge therein as said impact sensitive composition.
Claim 3
Dependent Claim 26 words
In an explosive assembly of claim 3, said detonator cord means having a core loading of from 0.1 to 25 grains per foot (PETN or equivalent).
Claim 4
Dependent Claim 12 words
An explosive assembly of claim 4 wherein said cartridge casing is rim-fired.
Claim 5
Dependent Claim 12 words
An explosive assembly of claim 4 wherein said cartridge casing is center-fired.
Claim 6
Dependent Claim 28 words
In an explosive assembly of claim 4, said detonator cord means extending as a single cord across the primer end of at least two of said booster charges.
Claim 7
Dependent Claim 15 words
An explosive assembly of claim 4 containing an ammonium nitrate-fuel oil (ANFO) main explosive charge.
Claim 8
Dependent Claim 37 words
A patteRn shooting system containing a plurality of explosive assemblies of claim 3, and a detonating cord trunk line spaced from said assemblies but connecting in common with each said detonator cord means in detonating relationship therewith.
Claim 9
Dependent Claim 70 words
In a pattern shooting system of claim 9, an additional of said detonators separately connecting with each said detonator cord means in detonating relationship therewith; said detonating cord trunk line connecting, in common, with each of said separate additional detonators in detonating relationship therewith, and said trunk line, and each said detonator cord initiating means having a core loading of from 0.1 to 25 grains per foot (PETN or equivalent).
Claim 10
Dependent Claim 32 words
In a pattern system of claim 9, each said detonator cord means connecting with said trunk line, having a core loading of from 0.1 to 25 grains per foot (PETN or equivalent).

References Cited (Backward Citations)

US1968565A Cited
US2325742A Cited
US2652775A Cited
US2944485A Cited
US3021786A Cited
US3106892A Cited
US3256814A Cited
US3306201A Cited
US3431851A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-01-09 1976-07-10 1977-01-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-01-09 1980-07-10 1981-01-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-01-09 1984-07-10 1985-01-09 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag