US3790104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High/low aspect ratio dual-mode fin design
Assignee: United States Department of the Navy
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Filing: 1973-03-12
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Granted: 1974-02-05
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Expires: 1993-03-12
Abstract
Abstract A dual-mode fin design for gun-launched, rocket-assisted, guided projectiles in which, from a flush position against the body, the fins rotate radially at launch to deploy in the low aspect-ratio mode for stability during the supersonic fly-out phase with transition to the high aspect-ratio mode for the transonic termianl maneuvering phase. Deployment of the fins to high aspect-ratio mode is effected by shearing restraining pins which allow the fins to rotate rearwardly about pivot pins and under the air stream influence.
Inventors
- 👤 D Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:22
CPC Classifications
F; F42; F42B; F42B10/00; F42B10/02; F42B10/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
64 words
A dual-mode fin system for a guided projectile comprising: a fin; a base for mounting said fin on the projectile body; means connecting said fin to said base for enabling said fin to deploy to a low aspect-ratio mode position; and means for connecting said base to the projectile body for enabling said fin and base to deploy to a high aspect-ratio mode position.
Claim 2
Dependent Claim
64 words
A dual-mode fin system for a guided projectile comprising: a fin; a base for mounting said fin on the projectile body; means connecting said fin to said base for enabling said fin to deploy to a low aspect-ratio mode position; and means for connecting said base to the projectile body for enabling said fin and base to deploy to a high aspect-ratio mode position.
Claim 3
Dependent Claim
42 words
A dual-mode fin system as defined in claim 1 wherein said means connecting said fin to said base comprises a hinge pin which permits pivotal movement of said fin outward from a stored position adjacent the projectile to the low aspect-ratio position.
Claim 4
Dependent Claim
45 words
A dual-mode fin system as defined in claim 1 wherein said means for connecting said base to the projectile body comprises a pivot pin which permits pivotal movement of said base and said fin outward from the low aspect-ratio position to the high aspect-ratio position.
Claim 5
Dependent Claim
60 words
A dual-mode fin system as defined in claim 3 wherein said means for connecting said base to the projectile body includes: a shear pin which cooperates with said pivot pins to initially hold said base to the projectile body; and means for shearing said shear pin to enable pivotal movement of said base and said fin about the pivot pin.
Claim 6
Dependent Claim
128 words
A dual-mode fin system for guided projectiles comprising: a fin; a base for mounting said fin on the projectile body; a hinge pin connecting said fin to said base which permits pivotal movement of said fin outward from a stored position adjacent the projectile body to the low aspect-ratio mode position; a pivot pin for connecting the rearward end of said base to the projectile body; a shear pin for connecting the forward end of said base to the projectile body and substantially longitudinally thereof; and means responsive to a command from the projectile guidance system for shearing said shear pin whereby said base and said fin are free to pivot about said pivot pin under airstream influence from the low aspect-ratio position to the high aspect-ratio position.
Claim 7
Dependent Claim
128 words
A dual-mode fin system for guided projectiles comprising: a fin; a base for mounting said fin on the projectile body; a hinge pin connecting said fin to said base which permits pivotal movement of said fin outward from a stored position adjacent the projectile body to the low aspect-ratio mode position; a pivot pin for connecting the rearward end of said base to the projectile body; a shear pin for connecting the forward end of said base to the projectile body and substantially longitudinally thereof; and means responsive to a command from the projectile guidance system for shearing said shear pin whereby said base and said fin are free to pivot about said pivot pin under airstream influence from the low aspect-ratio position to the high aspect-ratio position.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |