Patent US3575114A successfully refreshed from Google Patents.
US3575114A
Expired / Lapsed
US
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Time delay antidisturbance faze
Assignee: United States Department of the Navy
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Filing: 1968-08-16
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Granted: 1971-04-13
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Expires: 1988-08-16
Abstract
Abstract A fuze having an electronic arming delay timer, an antidisturbance firing mechanism, and a mechanical clock timer to detonate the fuze after a prescribed period of time if the antidisturbance firing mechanism is not actuated.
Inventors
- 👤 Donald G Quist
- 👤 Robert H Forster
- 👤 Gaylon L West
- 👤 Harry C Loyal
- 👤 Bernard M Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:25
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/28; H03K17/292; F; F42; F42C; F42C11/00; F42C11/06; F42C15/00; F42C15/40; H03K3/00; H03K3/02; H03K3/35; H03K3/351
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
A fuze comprising: means to initiate electrical timing means; electrical timing means to delay arming of the fuze for a first interval of time, during which time said arming is prevented; means to prevent firing of the fuze prior to the end of said first interval of time; means for simultaneously arming the fuze at the end of said first period of time and preventing further current drain to the electrical timing means; antidisturbance means for detonating the fuze at any time after the first interval of time; and mechanical timing means to detonate the fuze after a second interval of time which interval is longer than said first interval of time.
Claim 2
Dependent Claim
112 words
A fuze comprising: means to initiate electrical timing means; electrical timing means to delay arming of the fuze for a first interval of time, during which time said arming is prevented; means to prevent firing of the fuze prior to the end of said first interval of time; means for simultaneously arming the fuze at the end of said first period of time and preventing further current drain to the electrical timing means; antidisturbance means for detonating the fuze at any time after the first interval of time; and mechanical timing means to detonate the fuze after a second interval of time which interval is longer than said first interval of time.
Claim 3
Dependent Claim
87 words
The system of claim 1 wherein said electrical timing means to delay arming comprises: a first unijunction transistor relaxation oscillator having a short time constant; a second unijunction transistor relaxation oscillator having a time constant approximately equal to the arming delay time; means for coupling the first and second oscillator so that the output of the first oscillator lowers the breakdown voltage of the unijunction transistor of the second oscillator to ensure breakdown of said transistor at the end of a period equal to one time constant.
Claim 4
Dependent Claim
54 words
The system of claim 2 wherein said means to prevent firing of the fuze prior to the end of said first interval of time comprises: a silicon-controlled switch which grounds the firing circuit upon initiation of said electrical timing means; and removes said ground upon receiving an output pulse from the electrical timing means.
Claim 5
Dependent Claim
33 words
The system of claim 3 wherein said silicon-controlled switch operates a transistor switch which cuts off current to the electrical timing means in response to an output pulse from the electrical timing means.
Claim 6
Dependent Claim
29 words
The system of claim 4 wherein the antidisturbance means for detonating the fuze comprises: a switch capable of firing a properly biased silicon-controlled rectifier which will detonate the fuze.
Claim 7
Dependent Claim
13 words
The system of claim 5 wherein the antidisturbance switch is a trembler switch.
Claim 8
Dependent Claim
47 words
The system of claim 6 wherein the mechanical timing means for detonating the fuze comprises: a pair of contacts which when closed are capable of firing a properly biased silicon-controlled rectifier which will detonate the fuze; and the pair of contacts are closed by a clock timer.
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |