Patent US4708351A successfully refreshed from Google Patents.
Patent US3858515A successfully refreshed from Google Patents.
US3858515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projectile fuse
Assignee: Sarmac SA
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Filing: 1972-08-21
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Granted: 1975-01-07
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Expires: 1992-08-21
Abstract
Abstract A fuse for an explosive projectile comprises a forward primer and a rearward detonator that is exploded by the primer and that communicates with the primer through a firing passageway. The detonator and a valve that closes the passageway are mounted as an assembly for conjoint sliding movement from a forward position in which the detonator is outside the explosive charge of the projectile, to a rearward position in which the detonator is disposed within that explosive charge, under the influence of the inertia of the assembly when the projectile is launched and is accelerating. Thereafter, the deceleration of the projectile opens the valve, so that the projectile is armed only after it is well away from the launching site.
Inventors
- 👤 Maurice Rusbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:59
CPC Classifications
F; F42; F42C; F42C15/00; F42C15/18; F42C15/184; F42C15/20; F42C15/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
221 words
A projectile containing an explosive charge, and at the forward end of the projectile a fuse comprising a primer fixedly mounted in a forward portion of the fuse, a detonator containing an explosive charge, means defining a firing passageway between the primer and the detonator such that when the passage-way is open and the primer is fired, the primer will fire the detonator, means mounting the detonator for movement between a forward inactive position forward of and outside the explosive charge of the projectile and a rear active position to which the detonator moves by inertia when the projectile is fired and in which rear position the detonator is within the charge of the projectile, the fuse having fixed closure means which close said passageway in the forward position of the detonator and open said passageway in the rear position of the detonator, said detonator having movable closure means which move rearwardly with said detonator and close said passageway when said detonator moves toward said rear active position and which move forwardly relative to the detonator and open said passageway upon deceleration of the projectile, spring means resisting said rearward movement of the detonator and yieldably maintaining the detonator in said forward inactive position forward of and outside the explosive charge, and means to lock said detonator in said rear position.
Claim 2
Dependent Claim
221 words
A projectile containing an explosive charge, and at the forward end of the projectile a fuse comprising a primer fixedly mounted in a forward portion of the fuse, a detonator containing an explosive charge, means defining a firing passageway between the primer and the detonator such that when the passage-way is open and the primer is fired, the primer will fire the detonator, means mounting the detonator for movement between a forward inactive position forward of and outside the explosive charge of the projectile and a rear active position to which the detonator moves by inertia when the projectile is fired and in which rear position the detonator is within the charge of the projectile, the fuse having fixed closure means which close said passageway in the forward position of the detonator and open said passageway in the rear position of the detonator, said detonator having movable closure means which move rearwardly with said detonator and close said passageway when said detonator moves toward said rear active position and which move forwardly relative to the detonator and open said passageway upon deceleration of the projectile, spring means resisting said rearward movement of the detonator and yieldably maintaining the detonator in said forward inactive position forward of and outside the explosive charge, and means to lock said detonator in said rear position.
Claim 3
Dependent Claim
34 words
A projectile fuse as claimed in claim 1, and a plug at the rear of the detonator charge to separate the detonator charge from the projectile charge in said forward position of the detonator.
Claim 4
Dependent Claim
33 words
A projectile fuse as claimed in claim 1, said movable closure means comprising at least one ball disposed in a portion of said passageway that extends through a forward portion of said detonator.
Claim 5
Dependent Claim
67 words
A projectile fuse as claimed in claim 3, said fixed closure means comprising a shielding plate that extends across the interior of said fuse and that has a central imperforate portion that closes and retains said at least one ball in said portion of said passageway carried by the detonator, said shielding plate being perforate outwardly of said central portion to complete said passageway through said plate.
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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |