Patent US3786754A successfully refreshed from Google Patents.
US3786754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Firing delay for point detonating fuze
Assignee: United States Department of the Navy
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Filing: 1968-12-20
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Granted: 1974-01-22
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Expires: 1988-12-20
Abstract
Abstract A mechanical delay for point detonating fuzes for projectiles to allow penetration into aircraft or similar light target structures before detonation of the projectile. A trans-axial inertial firing pin is mounted within the projectile so that the centrifugal force exerted thereon by the spinning projectile during light target penetration will selectively determine the firing time delay. Alternatively, instantaneous detonation is provided by a second, axial firing pin when the projectile strikes an impenetrable target or one of such hardness that would break up the projectile before the trans-axial firing pin could react to provide the normal delayed detonation.
Inventors
- 👤 T Cammack
- 👤 R Schmidt
- 👤 W Donahue
- 👤 P Gratton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:58
CPC Classifications
F; F42; F42C; F42C15/00; F42C15/18; F42C15/188; F42C15/192; F42C15/196; F42C1/00; F42C1/02; F42C1/04; F42C14/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
134 words
An impact fuze for a spinning projectile, comprising: a housing having a substantially cylindrical chamber formed therein with the longitudinal axis of said chamber lying along the spin axis of said projectile, a primer disposed within said housing, a centrifugal force-responsive inertial firing pin for said primer mounted in said chamber for movement in a plane perpendicular to said longitudinal axis, and an impact-responsive member mounted in the chamber adjacent one end thereof for movement along said longitudinal axis, said member including means for normally preventing movement of said inertial firing pin and for releasing said firing pin for movement by the existing centrifugal force upon impact of the projectile with a target, whereby firing of said primer is delayed for a time directly proportional to the relative thickness of the target is provided.
Claim 2
Dependent Claim
134 words
An impact fuze for a spinning projectile, comprising: a housing having a substantially cylindrical chamber formed therein with the longitudinal axis of said chamber lying along the spin axis of said projectile, a primer disposed within said housing, a centrifugal force-responsive inertial firing pin for said primer mounted in said chamber for movement in a plane perpendicular to said longitudinal axis, and an impact-responsive member mounted in the chamber adjacent one end thereof for movement along said longitudinal axis, said member including means for normally preventing movement of said inertial firing pin and for releasing said firing pin for movement by the existing centrifugal force upon impact of the projectile with a target, whereby firing of said primer is delayed for a time directly proportional to the relative thickness of the target is provided.
Claim 3
Dependent Claim
56 words
A fuze according to clAim 1 wherein said impact-responsive member is an elongated rod, and said means for preventing movement of said inertial firing pin comprises flange means formed on said rod and normally engaging said inertial firing pin and movable from said engagement upon displacement of said rod along said longitudinal axis of said housing.
Claim 4
Dependent Claim
83 words
A fuze according to claim 2, and further including a rotor mounted in said housing adjacent the other end thereof for rotation by the centrifugal force developed by said spinning projectile from an unarmed to an armed position about an axis generally perpendicular to said longitudinal or spin axis, a detonator mounted in said rotor to lie along said longitudinal axis in said armed position, and means providing communication between said primer and said detonator when said rotor is in said armed position.
Claim 5
Dependent Claim
64 words
A fuze according to claim 3 wherein said elongated rod comprises a firing pin for said detonator, and further including means for normally preventing said elongated rod from moving along said longitudinal axis beyond a predetermined point to thereby prevent direct detonation of said detonator by said rod, said means being yieldable to an impact force of the degree encountered with an impenetrable target.
Claim 6
Dependent Claim
48 words
A fuze according to claim 4 wherein said means for preventing said rod from movement beyond a predetermined point comprises: an integral shear flange on said rod, and an arresting shoulder on said housing in the path of movement of said shear flange portion only of said rod.
Claim 7
Dependent Claim
60 words
A fuze according to claim 5, and further including a plurality of spin-out detents positioned within housing passages perpendicular to said longitudinal axis of said chamber and engaging said shear flange, whereby said rod is prevented from longitudinal displacement under normal handling conditions but is freed when the detents are disengaged therefrom by centrifugal forces developed by said spinning projectile.
Claim 8
Dependent Claim
115 words
An impact fuze for a spinning projectile, comprising: a housing having a substantially cylindrical chamber formed therein with the longitudinal axis of said chamber lying along the spin axis of said projectile, a primer disposed within said housing, a centilever spring firing pin mounted in said chamber for movement in a plane perpendicular to said longitudinal axis and being resiliently biased toward contact with said primer, an impact-responsive member mounted in said chamber adjacent one end thereof for movement along said longitudinal axis, said member including means for normally preventing movement of said cantilever spring firing pin and for releasing said cantilever spring firing pin upon impact with a target for movement toward said primer.
Claim 9
Dependent Claim
115 words
An impact fuze for a spinning projectile, comprising: a housing having a substantially cylindrical chamber formed therein with the longitudinal axis of said chamber lying along the spin axis of said projectile, a primer disposed within said housing, a centilever spring firing pin mounted in said chamber for movement in a plane perpendicular to said longitudinal axis and being resiliently biased toward contact with said primer, an impact-responsive member mounted in said chamber adjacent one end thereof for movement along said longitudinal axis, said member including means for normally preventing movement of said cantilever spring firing pin and for releasing said cantilever spring firing pin upon impact with a target for movement toward said primer.
Claim 10
Dependent Claim
58 words
A fuze according to claim 7 wherein said impact-responsive member is an elongated rod, and said means for preventing movement of said cantilever spring firing pin comprises flange means formed on said rod and normally engaging said cantilever spring firing pin and movable from said engagement upon displacement of said rod along said longitudinal axis of said housing.
Claim 11
Dependent Claim
160 words
A fuze according to claim 8, and further including a rotor mounted in said housing adjacent the other end thereof for rotation by the centrifugal force developed by said spinning projectile from an unarmed to an armed position about an axis generally perpendicular to said longitudinal or spin axis, a detonator mounted in said rotor to lie along said longitudinal axis in said armed position, means providing communication between said primer and said detonator when said rotor is in said armed position, said elongated rod being a firing pin for said detonator, an integral shear flange on said rod, and an arresting shoulder on said housing in the path of movement of said shear flange portion only of said rod, whereby movement of said rod beyond a predetermined point is normally prevented to thereby prevent direct detonation of said detonator by said rod, said shear flange being yieldable to an impact force of the degree encountered with an impenetrable target.
References Cited (Backward Citations)
US2609753A
Cited
US3371608A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |