Patent US3886866A successfully refreshed from Google Patents.
US3886866A
Expired / Lapsed
US
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Capacitor - contact fuze system
Assignee: United States Department of the Navy
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Filing: 1972-11-24
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Granted: 1975-06-03
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Expires: 1992-11-24
Abstract
Abstract A contact fuzing system having an acceleration-responsive variable capacitor for initiating detonation. The capacitor is connected in parallel with a detonator and an electrical switch. One plate of the capacitor is resiliently mounted and arranged to separate from the other plate as the fuzing system decelerates. Upon separation, the voltage across the capacitor increases thereby triggering the switch and firing the detonator.
Inventors
- 👤 Ernest F Fohrmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:39
CPC Classifications
F; F42; F42C; F42C11/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
77 words
A capacitor-contact fuzing system for use in an explosive device, comprising: a capacitor; a detonator connected to said capacitor; an electronic switch connected to said capacitor and said detonator for enabling the firing of said detonator when the voltage across said capacitor increases to a predetermined magnitude and means connected to said capacitor for decreasing the capacitance thereof in response to deceleration of said explosive device whereby said decrease in capacitance increases the voltage across said capacitor.
Claim 2
Dependent Claim
77 words
A capacitor-contact fuzing system for use in an explosive device, comprising: a capacitor; a detonator connected to said capacitor; an electronic switch connected to said capacitor and said detonator for enabling the firing of said detonator when the voltage across said capacitor increases to a predetermined magnitude and means connected to said capacitor for decreasing the capacitance thereof in response to deceleration of said explosive device whereby said decrease in capacitance increases the voltage across said capacitor.
Claim 3
Dependent Claim
77 words
A capacitor-contact fuzing system for use in an explosive device, comprising: a capacitor; a detonator connected to said capacitor; an electronic switch connected to said capacitor and said detonator for enabling the firing of said detonator when the voltage across said capacitor increases to a predetermined magnitude and means connected to said capacitor for decreasing the capacitance thereof in response to deceleration of said explosive device whereby said decrease in capacitance increases the voltage across said capacitor.
Claim 4
Dependent Claim
77 words
A capacitor-contact fuzing system for use in an explosive device, comprising: a capacitor; a detonator connected to said capacitor; an electronic switch connected to said capacitor and said detonator for enabling the firing of said detonator when the voltage across said capacitor increases to a predetermined magnitude and means connected to said capacitor for decreasing the capacitance thereof in response to deceleration of said explosive device whereby said decrease in capacitance increases the voltage across said capacitor.
Claim 5
Dependent Claim
21 words
The capacitor-contact fuzing system of claim 1 wherein said means includes means for increasing the distance between plates of the capacitor.
Claim 6
Dependent Claim
52 words
The capacitor-contact fuzing system of claim 2 wherein said last mentioned means includes resilient means connected to at least one of said plates of said capacitor for biasing one plate to a predetermined position and permitting relative displacement of said one plate from another plate in response to a predetermined decelerating force.
Claim 7
Dependent Claim
25 words
The capacitor-contact fuzing system of claim 1 wherein said means includes means for decreasing the effective area of interaction of the plates of the capacitor.
Claim 8
Dependent Claim
50 words
The capacitor-contact fuzing system of claim 4 wherein said last mentioned means includes resilient means connected to at least one of said plates of said capacitor for biasing one plate to a predetermined position and permitting relative displacement of said one plate from another plate at a predetermined decelerating force.
Claim 9
Dependent Claim
20 words
The capacitor-contact fuzing system of claim 1 wherein the deceleration of said explosive device occurs upon contact with an object.
Claim 10
Dependent Claim
64 words
An electronic firing circuit comprising: a firing capacitor; a device to be activated by said firing capacitor; an electronic switch connected in a series circuit with said device, said firing capacitor being connected in parallel with said series circuit; and means to decrease the capacitance of said capacitor while maintaining the charge on said capacitor constant and thereby increase the voltage across said capacitor.
Claim 11
Dependent Claim
64 words
An electronic firing circuit comprising: a firing capacitor; a device to be activated by said firing capacitor; an electronic switch connected in a series circuit with said device, said firing capacitor being connected in parallel with said series circuit; and means to decrease the capacitance of said capacitor while maintaining the charge on said capacitor constant and thereby increase the voltage across said capacitor.
Claim 12
Dependent Claim
58 words
The electronic firing circuit of claim 7 wherein said capacitor has at least two plates and said means includes resilient means for biasing at least one plate of the capacitor into a predetermined position and permitting relative displacement of said one plate relative to another plate when a force of a predetermined magnitude acts on said one plate.
Claim 13
Dependent Claim
22 words
The electronic firing circuit of claim 8 wherein said predetermined forcE is a deceleration force which occurs upon contact with an object.
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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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |