Patent US3991679A successfully refreshed from Google Patents.
US3991679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Booster apparatus for augmenting side initiation of explosive cords
Assignee: United States Department of the Navy
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Filing: 1975-06-23
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Granted: 1976-11-16
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Expires: 1995-06-23
Abstract
Abstract A booster charge is provided with an arcuate, semi-cylindrical surface dised in continuous contact with a length of explosive cord at a location medial of its length. A donor charge detonates the booster which, in turn, applies the detonation force to a side portion of the explosive cord to produce a cord detonation propagating axially in both directions. Reliability of the cord detonation is increased by the increased amount of the booster charge closely adjacent to the cord and by some focusing of the booster charge. The shock wave propagation in the cord is reliably augmented by the booster. The increased reliability factors permit miniaturization of the donor charge, the booster and the cord.
Inventors
- 👤 Jacob Savitt
- 👤 William Campbell Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:47
CPC Classifications
F; F42; F42D; F42D1/00; F42D1/04; F42D1/043
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
145 words
Apparatus for initiating the detonation of a continuous length of explosive cord at a site disposed medially of its length, comprising: a manifold housing formed with a longitudinal opening having inner and outer end portions and with a second opening extending transversely of and intersecting said first opening, said cord length being run through said second opening, a donor charge disposed in the outer end portion of said first opening, and a booster charge disposed between said donor charge and said cord, said booster charge having an outer end wall disposed in close proximity with said donor charge and an inner end wall having an arcuate extent disposed in substantially continuous contact with a major peripheral extent of the outwardly-facing circumferential portion of said cord, said donor charge detonating said booster charge to focus its explosive force into said cord throughout said major peripherial extent.
Claim 2
Dependent Claim
145 words
Apparatus for initiating the detonation of a continuous length of explosive cord at a site disposed medially of its length, comprising: a manifold housing formed with a longitudinal opening having inner and outer end portions and with a second opening extending transversely of and intersecting said first opening, said cord length being run through said second opening, a donor charge disposed in the outer end portion of said first opening, and a booster charge disposed between said donor charge and said cord, said booster charge having an outer end wall disposed in close proximity with said donor charge and an inner end wall having an arcuate extent disposed in substantially continuous contact with a major peripheral extent of the outwardly-facing circumferential portion of said cord, said donor charge detonating said booster charge to focus its explosive force into said cord throughout said major peripherial extent.
Claim 3
Dependent Claim
22 words
The apparatus of claim 1 wherein said inner end wall is shaped for continuously contacting at least about 180° of said cord.
Claim 4
Dependent Claim
26 words
The apparatus of claim 2 wherein said donor charge is miniaturized to provide a detonating force near the minimum needed for producing a reliable cord detonation.
Claim 5
Dependent Claim
40 words
The apparatus of claim 3 wherein said explosive cord is a mild detonating cord, said charge being dimensioned to have a width approximately equal to the diameter of said cord and a length at least as great as said width.
Claim 6
Dependent Claim
26 words
The apparatus of claim 2 wherein the dimensions of said housing openings are reduced to a minimum needed for receiving and detonating a mild detonating cord.
Claim 7
Dependent Claim
27 words
The apparatus of claim 1 wherein said booster charge inner end wall is provided with a fluted contour for improving the jet penetration force of said charge.
Claim 8
Dependent Claim
13 words
The apparatus of claim 6 wherein said explosive cord is a shielded cord.
Claim 9
Dependent Claim
18 words
The apparatus of claim 6 wherein said cord is a shielded cord of a mild detonating cord type.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-16 | 1980-05-17 | 1980-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-16 | 1984-05-17 | 1984-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-16 | 1988-05-17 | 1988-11-16 | $7700.00 | Window Closed / Lapsed |