US4347463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic projectile launcher with self-augmenting rails
Assignee: Northrop Grumman Corp
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Filing: 1980-04-03
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Granted: 1982-08-31
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Expires: 2000-04-03
Abstract
Abstract A self-augmented parallel rail electromagnetic projectile launcher with a commutating circuit breaker disposed adjacent the breech.
Inventors
- 👤 George A. Kemeny
- 👤 Donald C. Litz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:27
CPC Classifications
F; F41; F41B; F41B6/00; F41B6/006
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
164 words
An electromagnetic projectile launcher comprising: a first conductor; a second conductor disposed generally parallel to said first conductor; means for propelling a projectile from one end of the first and second conductors to the other end thereof and for conducting current therebetween; a third conductor disposed generally parallel and adjacent said second conductor and being electrically connected to said first conductor adjacent said one end thereof; a fourth conductor disposed generally parallel and adjacent said first conductor and being electrically connected to said second conductor adjacent said one end thereof; a source of high current electrically connected to the other end of said third and fourth conductors; and circuit breaking means electrically connected between the one end of said first and second conductors, whereby the current required for launching a projectile at a predetermined velocity is rapidly commutated to the first and second conductors by opening said circuit breaking means and the current is lower than that required utilizing a single pair of conductors.
Claim 2
Dependent Claim
164 words
An electromagnetic projectile launcher comprising: a first conductor; a second conductor disposed generally parallel to said first conductor; means for propelling a projectile from one end of the first and second conductors to the other end thereof and for conducting current therebetween; a third conductor disposed generally parallel and adjacent said second conductor and being electrically connected to said first conductor adjacent said one end thereof; a fourth conductor disposed generally parallel and adjacent said first conductor and being electrically connected to said second conductor adjacent said one end thereof; a source of high current electrically connected to the other end of said third and fourth conductors; and circuit breaking means electrically connected between the one end of said first and second conductors, whereby the current required for launching a projectile at a predetermined velocity is rapidly commutated to the first and second conductors by opening said circuit breaking means and the current is lower than that required utilizing a single pair of conductors.
Claim 3
Dependent Claim
29 words
An electromagnetic projectile launcher as set forth in claim 1, wherein the means for propelling the projectile is a conductive armature slidably disposed between the first and second conductors.
Claim 4
Dependent Claim
26 words
An electromagnetic projectile launcher as set forth in claim 1, wherein the circuit breaking means comprises a high current switch connected in parallel with a fuse.
Claim 5
Dependent Claim
29 words
An electromagnetic projectile launcher as set forth in claim 1, wherein there is electrical insulation disposed between the first and fourth conductors and between the second and third conductors.
Claim 6
Dependent Claim
36 words
An electromagnetic projectile launcher as set forth in claim 2, wherein the first and second conductors have an insulating strip disposed adjacent the one end thereof between at least one of the conductors and the armature.
Claim 7
Dependent Claim
28 words
An electromagnetic projectile launcher as set forth in claim 5, and further comprising means for initiating movement of the conductive armature to move it beyond the insulating strips.
Claim 8
Dependent Claim
20 words
An electromagnetic projectile launcher as set forth in claim 1, wherein the source of high current comprises an induction coil.
Claim 9
Dependent Claim
21 words
An electromagnetic projectile launcher as set forth in claim 7, wherein the source of high current further comprises a homopolar generator.
Claim 10
Dependent Claim
23 words
An electromagnetic projectile launcher as set forth in claim 1, and further comprising series switching means disposed between the source and one conductor.
Claim 11
Dependent Claim
38 words
An electromagnetic projectile launcher as set forth in claim 1, wherein the current in the first and fourth conductors flows in the same direction and the current in the second and third conductors flows in the same direction.
Claim 12
Dependent Claim
161 words
An electromagnetic projectile launcher comprising: a first conductor; a second conductor disposed generally parallel to said first conductor; means for propelling a projectile from one end of the first and second conductors to the other and for conducting current therebetween; additional conductors disposed in groups adjacent said first and second conductors; said additional conductors being so disposed that conductors disposed adjacent said first conductor have current that flows in the same direction as it flows in the first conductor and conductors disposed adjacent said second have current that flows in the same direction as it flows in the second conductor; a source of high current electrically connected to said conductors; and circuit breaking means electrically connected to the one end of said first and second conductors, whereby the current required for launching the projectile at a predetermined velocity is rapidly commutated to the first and second rails and is at a lower value than required utilizing a single pair of conductors.
Claim 13
Dependent Claim
161 words
An electromagnetic projectile launcher comprising: a first conductor; a second conductor disposed generally parallel to said first conductor; means for propelling a projectile from one end of the first and second conductors to the other and for conducting current therebetween; additional conductors disposed in groups adjacent said first and second conductors; said additional conductors being so disposed that conductors disposed adjacent said first conductor have current that flows in the same direction as it flows in the first conductor and conductors disposed adjacent said second have current that flows in the same direction as it flows in the second conductor; a source of high current electrically connected to said conductors; and circuit breaking means electrically connected to the one end of said first and second conductors, whereby the current required for launching the projectile at a predetermined velocity is rapidly commutated to the first and second rails and is at a lower value than required utilizing a single pair of conductors.
Claim 14
Dependent Claim
22 words
An electromagnetic projectile launcher as set forth in claim 11, wherein all of said conductors are connected in series during the launch.
Claim 15
Dependent Claim
29 words
An electromagnetic projectile launcher as set forth in claim 12, wherein two or more of the additional conductors are not the same length as the first and second conductors.
Claim 16
Dependent Claim
29 words
An electromagnetic projectile launcher as set forth in claim 11, wherein two or more of the additional conductors are not the same length as the first and second conductor.
Claim 17
Dependent Claim
27 words
An electromagnetic projectile launcher as set forth in claim 1, wherein the means for propelling the projectile is an arc established between the first and second conductors.
Claim 18
Dependent Claim
27 words
An electromagnetic projectile launcher as set forth in claim 11, wherein the means for propelling the projectile is an arc established between the first and second conductors.
Claim 19
Dependent Claim
20 words
An electromagnetic projectile launcher as set forth in claim 11, wherein the additional conductors have cooling means cooperatively associated therewith.
Claim 20
Dependent Claim
72 words
An electromagnetic projectile launcher comprising: a projectile; a high current source; a plurality of conductors connected to said source and cooperatively arranged to produce a magnetic field directed to increase the force which launches the projectile; two additional conductors; and circuit breaking means; said circuit breaking means and said two additional conductors being interconnected with said plurality of conductors so that said two conductors only conduct current after commencement of the launch.
Claim 21
Dependent Claim
72 words
An electromagnetic projectile launcher comprising: a projectile; a high current source; a plurality of conductors connected to said source and cooperatively arranged to produce a magnetic field directed to increase the force which launches the projectile; two additional conductors; and circuit breaking means; said circuit breaking means and said two additional conductors being interconnected with said plurality of conductors so that said two conductors only conduct current after commencement of the launch.
Claim 22
Dependent Claim
26 words
An electromagnetic projectile launcher as set forth in claim 18, wherein all of said conductors are generally connected in series prior to completion of the launch.
Claim 23
Dependent Claim
25 words
An electromagnetic projectile launcher as set forth in claim 18, wherein all of said conductors are generally connected in a closed loop during the launch.
Claim 24
Dependent Claim
97 words
An electromagnetic projectile launcher comprising: a projectile; a source of high current comprising inductive energy storage means; circuit breaking means; a plurality of conductors generally connected in series with said source; a pair of additional conductors interconnected with said plurality of conductors and said circuit breaking means so that said pair of additional conductors only conduct projectile propelling current after commencement of the launch, and said plurality of conduction conducting current prior to commencement of the launch and being arranged to produce a magnetic field properly directed to increase the force propelling the projectile during the launch.
Claim 25
Dependent Claim
97 words
An electromagnetic projectile launcher comprising: a projectile; a source of high current comprising inductive energy storage means; circuit breaking means; a plurality of conductors generally connected in series with said source; a pair of additional conductors interconnected with said plurality of conductors and said circuit breaking means so that said pair of additional conductors only conduct projectile propelling current after commencement of the launch, and said plurality of conduction conducting current prior to commencement of the launch and being arranged to produce a magnetic field properly directed to increase the force propelling the projectile during the launch.
Claim 26
Dependent Claim
45 words
An electromagnetic projectile launcher as set forth in claim 21, wherein the inductive energy storage is cooperatively provided by an induction coil and inductive energy stored in the magnetic field produced by the plurality of conductors which carry current prior to commencement of the launch.
Claim 27
Dependent Claim
39 words
An electromagnetic projectile launcher as set forth in claim 21, wherein the inductive energy storage is substantially the energy stored in the magnetic field produced by the plurality of conductors which conduct current prior to commencement of the launch.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |