US4449441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic projectile launcher with magnetic spin stabilization
Assignee: Westinghouse Electric Corp
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Filing: 1982-03-09
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Granted: 1984-05-22
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Expires: 2002-03-09
Abstract
Abstract An electromagnetic projectile launcher is provided with a magnetic field in the path of the projectile. This field induces currents in conductors within the projectile or interacts with a magnetic projectile to produce a torque which imparts spin stabilization to the projectile. Arcuate conductive rails are brought together to form a cylindrical bore to accommodate the cylindrical projectile necessary for spin stabilization.
Inventors
- 👤 Dan R. McAllister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:40
CPC Classifications
F; F41; F41B; F41B6/00; F41B6/006
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
147 words
A parallel rail electromagnetic projectile launcher comprising: a first conductive rail having an arcuate surface; a second conductive rail having an arcuate surface and being disposed parallel to said first conductive rail, to form a cylindrical bore between said rails, wherein the arcuate surfaces of said rails define a portion of the perimeter of said bore; a source of high current; means for commutating said current to said rails; means for conducting current between said rails and for propelling a cylindrical projectile along said bore; means for generating a magnetic flux field through which said projectile passes during a launch, wherein said magnetic flux field is distinct from electromagnetic fields produced by current flowing through said rails which are used to propel said projectile; and means for imparting electromagnetically induced spin to said projectile in response to the passing of said projectile through said magnetic flux field.
Claim 2
Dependent Claim
147 words
A parallel rail electromagnetic projectile launcher comprising: a first conductive rail having an arcuate surface; a second conductive rail having an arcuate surface and being disposed parallel to said first conductive rail, to form a cylindrical bore between said rails, wherein the arcuate surfaces of said rails define a portion of the perimeter of said bore; a source of high current; means for commutating said current to said rails; means for conducting current between said rails and for propelling a cylindrical projectile along said bore; means for generating a magnetic flux field through which said projectile passes during a launch, wherein said magnetic flux field is distinct from electromagnetic fields produced by current flowing through said rails which are used to propel said projectile; and means for imparting electromagnetically induced spin to said projectile in response to the passing of said projectile through said magnetic flux field.
Claim 3
Dependent Claim
47 words
An electromagnetic projectile launcher as recited in claim 1, wherein said means for imparting spin to said projectile comprises: a plurality of conductors arranged generally longitudinally within said projectile, said conductors being electrically connected to each other and skewed with respect to the axis of said projectile.
Claim 4
Dependent Claim
45 words
An electromagnetic projectile launcher as recited in claim 1, wherein said means for imparting spin to said projectile comprises: a cylindrical magnetic segment of said projectile; said magnetic segment being notched longitudinally and said notches being skewed with respect to the axis of said projectile.
Claim 5
Dependent Claim
23 words
An electromagnetic projectile launcher as recited in claim 1, wherein said means for generating a magnetic flux field comprises: a plurality of magnets.
Claim 6
Dependent Claim
21 words
An electromagnetic launcher as recited in claim 4, wherein similar magnetic poles are disposed on diametrically opposite sides of said bore.
Claim 7
Dependent Claim
14 words
An electromagnetic launcher as recited in claim 4, wherein said magnets are permanent magnets.
Claim 8
Dependent Claim
13 words
An electromagnetic launcher as recited in claim 4, wherein said magnets are electromagnets.
Claim 9
Dependent Claim
15 words
An electromagnetic launcher as recited in claim 7, further comprising: means for energizing said electromagnets.
Claim 10
Dependent Claim
29 words
An electromagnetic launcher as recited in claim 1, further comprising: insulation disposed between said rails, said insulation including protrusions which form a portion of the perimeter of said bore.
Claim 11
Dependent Claim
31 words
An electromagnetic launcher as recited in claim 1, further comprising: a graded insulation insert disposed along the inner surface of each of said rails at the muzzle end of said rails.
Claim 12
Dependent Claim
23 words
An electromagnetic launcher as recited in claim 1, further comprising: a muzzle arc resistor electrically connected to the muzzle end of said rails.
References Cited (Backward Citations)
US1370200A
Cited
GB448496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |