US4090450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety device
Assignee: Saab Bofors AB
•
Filing: 1976-10-20
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Granted: 1978-05-23
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Expires: 1996-10-20
Abstract
Abstract An improved safety device for a projectile includes a movable element which selectively positions a priming cap in position to ignite the charge of the projectile. A safety plate separating the priming cap and the main charge of the projectile is pierced by a member projected from the safety device by the gas pressure of the ignited priming cap.
Inventors
- 👤 Olof Martin Nygards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:35
CPC Classifications
F; F42; F42C; F42C15/00; F42C15/34
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
143 words
An improved safety device for the initiating device of a projectile, rocket or the like, said projectile being of the type having a space for a charge, said space being closed at one end by a safety plate; a priming charge; and movable member means arranged on the opposite side of said plate from said charge for movement from a safety position in which said priming charge is separated from said safety plate by at least said movable member means to an armed position in which hot gases from said priming charge can pass through said movable member and safety plate to ignite said charge, said safety device further comprising a punch member means mounted for acceleration by gas pressure generated upon ignition of said priming charge for piercing said safety plate to allow said hot gases to reach and ignite said charge.
Claim 2
Dependent Claim
143 words
An improved safety device for the initiating device of a projectile, rocket or the like, said projectile being of the type having a space for a charge, said space being closed at one end by a safety plate; a priming charge; and movable member means arranged on the opposite side of said plate from said charge for movement from a safety position in which said priming charge is separated from said safety plate by at least said movable member means to an armed position in which hot gases from said priming charge can pass through said movable member and safety plate to ignite said charge, said safety device further comprising a punch member means mounted for acceleration by gas pressure generated upon ignition of said priming charge for piercing said safety plate to allow said hot gases to reach and ignite said charge.
Claim 3
Dependent Claim
26 words
A safety device according to claim 1, wherein said punch member means is integral with said movable member means by means of a narrow, ring-shaped section.
Claim 4
Dependent Claim
23 words
A safety device according to claim 1, wherein said movable member means comprises a sliding member mounted for movement transversely of said projectile.
Claim 5
Dependent Claim
58 words
A safety device according to claim 1, wherein said priming charge is stationary and said movable member means forms a barrier between said priming charge and said safety plate in said safety position, further comprising a hole in said movable member means which aligns with said priming charge when said movable member means is in said armed position.
Claim 6
Dependent Claim
49 words
A safety device according to claim 1, wherein said priming charge is arranged in a cavity in said movable member, means further comprising a barrier between said movable member means and said safety plate, said barrier having an opening which aligns with said priming charge in said armed position.
Claim 7
Dependent Claim
21 words
A safety device according to claim 5, wherein said punch member means is arranged in said cavity with said primary charge.
Claim 8
Dependent Claim
30 words
A safety device according to claim 6, wherein said movable member means comprises a rotor mounted for rotation about an axis in said projectile between said safety and armed position.
Claim 9
Dependent Claim
35 words
A safety device according to claim 7, wherein said axis is parallel to the axis of said projectile and said cavity forms a through hole in said rotor, said hole being parallel to said axis.
Claim 10
Dependent Claim
31 words
A safety device according to claim 8, wherein said cavity is circular; and said punch member means is cylindrical and forms a gas tight seal with the wall of said cavity.
Claim 11
Dependent Claim
22 words
A safety device according to claim 9, wherein said punch member means has a length greater than the thickness of said barrier.
References Cited (Backward Citations)
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Cited
US3547033A
Cited
US3620164A
Cited
US3618523A
Cited
US3744424A
Cited
US3886868A
Cited
US3978791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |