Patent US4335655A successfully refreshed from Google Patents.
US4335655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for detonating explosive in response to detonation of remote explosive
Assignee: United States Department of the Army
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Filing: 1980-03-25
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Granted: 1982-06-22
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Expires: 2000-03-25
Abstract
Abstract A method and apparatus for detonating an explosive in response to the dettion of a remote explosive without damaging any components positioned intermediate the two explosives. A permanent magnet having a coil of wire positioned thereabout is positioned adjacent to one of the explosives, and the output from the coil is connected to the detonator for the second explosive. When the first explosive is detonated, the permanent magnet is destroyed to thereby collapse the magnetic field traversing the coil. The collapse of the magnetic field generates a voltage which is transmitted to the detonator for the second explosive for initiating detonation of same. The preferred embodiment positions the coil and magnet adjacent to an electronic time fuze detonator and lead charge at the forward end of a cargo-carrying projectile, whereas the second explosive is positioned at the rear of the projectile for initiating ejection of a payload.
Inventors
- 👤 Letcher A. Lofgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:15
CPC Classifications
F; F42; F42C; F42C11/00; F42C11/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
An apparatus for releasing a payload from a projectile comprising: a means for securing said payload positioned on the rear of said projectile; a first explosive charge positioned at the forward end of said projectile; a fuze for detonating said first explosive charge; electromagnetic induction means positioned adjacent to said first explosive charge; a second explosive charge positioned adjacent said means for securing; means for detonating said second explosive charge in response to the detonation of said first explosive charge whereby said payload is released.
Claim 2
Independent Claim
85 words
An apparatus for releasing a payload from a projectile comprising: a means for securing said payload positioned on the rear of said projectile; a first explosive charge positioned at the forward end of said projectile; a fuze for detonating said first explosive charge; electromagnetic induction means positioned adjacent to said first explosive charge; a second explosive charge positioned adjacent said means for securing; means for detonating said second explosive charge in response to the detonation of said first explosive charge whereby said payload is released.
Claim 3
Dependent Claim
39 words
The apparatus as set forth in claim 1, wherein said electromagnetic induction means comprises a magnet and a coil of wire positioned in proximity to said magnet so as to be traversed by the magnetic field of said magnet.
Claim 4
Dependent Claim
42 words
The apparatus as set forth in claim 2, wherein said magnet is positioned adjacent said first explosive and is destroyed in response to the detonation of said first explosive whereby said magnetic field through said coil of wire is caused to collapse.
Claim 5
Dependent Claim
27 words
The apparatus of claim 3, wherein said magnet comprises a substantially cylindrical permanent magnet and said coil of wire is wrapped about the periphery of said magnet.
Claim 6
Dependent Claim
32 words
The apparatus of claim 4, further comprising spool means positioned between said periphery of said magnet and said coil of wire for holding said coil of wire in place in said fuze.
Claim 7
Independent Claim
109 words
A method of detonating a first explosive charge positioned remotely from and in response to a second explosive charge without damaging components positioned between said first and second charges, comprising the steps of: positioning a permanent magnet in proximity to said second explosive charge; wrapping a coil of wire in proximity to said magnet so that said coil is traversed by the magnetic field of said magnet; connecting electrical wire between said coil and means for detonating said first explosive charge; and detonating said second explosive charge to cause said magnetic field to collapse and thereby generate a voltage in said electrical wire to detonate said first explosive charge.
Claim 8
Independent Claim
109 words
A method of detonating a first explosive charge positioned remotely from and in response to a second explosive charge without damaging components positioned between said first and second charges, comprising the steps of: positioning a permanent magnet in proximity to said second explosive charge; wrapping a coil of wire in proximity to said magnet so that said coil is traversed by the magnetic field of said magnet; connecting electrical wire between said coil and means for detonating said first explosive charge; and detonating said second explosive charge to cause said magnetic field to collapse and thereby generate a voltage in said electrical wire to detonate said first explosive charge.
Claim 9
Dependent Claim
27 words
The method of claim 6, wherein said step of detonating said second explosive charge includes the step of destroying said magnet and thereby collapsing said magnetic field.
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) | 1985-06-21 | 1985-12-21 | 1986-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-21 | 1989-12-21 | 1990-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-21 | 1993-12-21 | 1994-06-22 | $7700.00 | Window Closed / Lapsed |