US4159679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projectile fuze
Assignee: United States Department of the Army
•
Filing: 1977-08-29
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Granted: 1979-07-03
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Expires: 1997-08-29
Abstract
Abstract A low cost graze sensor fuze arrangement for a point detonating spin stabzed projectile in which firing pin actuation for detonation purposes is accomplished where the projectile may only graze the target and a graze sensor element will be laterally moved a limited amount to cam a firing pin assembly rearwardly toward a rotor armed detonator.
Inventors
- 👤 Melvin Eneman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:04
CPC Classifications
F; F42; F42C; F42C1/00; F42C1/02; F42C1/04; F42C1/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
179 words
In a point detonating spin stabilized projectile having a tapered forward nose member and a fuze forward housing secured in said nose member, said fuze forward housing having a central longitudinal passage accommodating a longitudinally movable firing pin, said fuze forward housing having a forwardly opening recess containing a firing pin assembly, said firing pin assembly including said firing pin and an element having a plurality of slotted inclined walls, a camming ball adjacent each of said slotted inclined walls, each of said balls being responsive to centrifugal force for forwardly camming said firing pin assembly to arm said firing pin assembly, a graze sensor having means for rearwardly camming said armed firing pin assembly to operatively actuate said firing pin, said graze sensor having a forwardly opening cylindrical recess, said firing pin assembly element having means including an annular forwardly protruding beveled surface for limiting lateral movements of said graze sensor, a rearwardly opening tubular sleeve slidably mounted in said cylindrical recess, and a compression spring in said sleeve for forwardly biasing said sleeve against said nose member.
Claim 2
Dependent Claim
179 words
In a point detonating spin stabilized projectile having a tapered forward nose member and a fuze forward housing secured in said nose member, said fuze forward housing having a central longitudinal passage accommodating a longitudinally movable firing pin, said fuze forward housing having a forwardly opening recess containing a firing pin assembly, said firing pin assembly including said firing pin and an element having a plurality of slotted inclined walls, a camming ball adjacent each of said slotted inclined walls, each of said balls being responsive to centrifugal force for forwardly camming said firing pin assembly to arm said firing pin assembly, a graze sensor having means for rearwardly camming said armed firing pin assembly to operatively actuate said firing pin, said graze sensor having a forwardly opening cylindrical recess, said firing pin assembly element having means including an annular forwardly protruding beveled surface for limiting lateral movements of said graze sensor, a rearwardly opening tubular sleeve slidably mounted in said cylindrical recess, and a compression spring in said sleeve for forwardly biasing said sleeve against said nose member.
Claim 3
Dependent Claim
77 words
The structure in accordance with claim 1 wherein said sleeve has a stepped cylindrical sidewall defining a reduced diameter portion, and said graze sensor has an inwardly directed protuberance for guiding relative motion between said sleeve and graze sensor, said sleeve having a closed forward end terminating in a central convex external surface portion, said nose member having a central concave tip surface portion, said convex and concave surface portions having substantially the same radius of curvature.
Claim 4
Dependent Claim
51 words
The structure of claim 1 wherein a guide post having an enlarged head portion is positioned in said graze sensor cylindrical recess, said compression spring surrounds said guide post, and a plurality of washers are positioned intermediate said guide post head portion and the base of said graze sensor cylindrical recess.
Claim 5
Dependent Claim
48 words
The structure according to claim 1 wherein said firing pin assembly includes a conically tapered forward external surface portion, and said graze sensor has a tapered rearwardly opening recess having surface portions in at least partial contact with said conical surface portion and partially defining said camming means.
Claim 6
Dependent Claim
35 words
The structure of claim 4 wherein the rearmost portion of said graze sensor has a terminating tapered recess in a substantially flat annular surface for contacting a portion of said annular forwardly protruding beveled surface.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-02 | 1983-01-01 | 1983-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-02 | 1987-01-01 | 1987-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-02 | 1991-01-01 | 1991-07-03 | $7700.00 | Window Closed / Lapsed |