Patent US3930449A successfully refreshed from Google Patents.
US3930449A
Expired / Lapsed
US
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Time delay initiator
Assignee: United States Department of the Army
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Filing: 1974-05-06
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Granted: 1976-01-06
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Expires: 1994-05-06
Abstract
Abstract A self-contained, accurately timed ignitor system for igniting a rocket mr within a preselected time interval. The timing period is initiated by an electrical input signal. A self-contained, spring wound timer and power source package, carried within the motor nozzle and used in igniting the rocket motor, is activated by the input signal.
Inventors
- 👤 Reuben J. Buchele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:41
CPC Classifications
F; F41; F41A; F41A19/00; F41A19/58; F42; F42C; F42C11/00; F42C11/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
A time delay initiator comprising: a timing circuit having a trigger input, plural power inputs, and plural outputs for coupling to load circuitry; said timing circuit comprises a spring wound timer having a rotatable shaft and disposed for activation by said trigger input, and plural switches coupled between said power inputs and outputs for coupling power therebetween, said switches being disposed adjacent the shaft of said timer for activation during shaft rotation; a first thermal battery having an input and having an output coupled to a first of said plural power inputs; and means coupled to said battery input for activating said battery.
Claim 2
Dependent Claim
103 words
A time delay initiator comprising: a timing circuit having a trigger input, plural power inputs, and plural outputs for coupling to load circuitry; said timing circuit comprises a spring wound timer having a rotatable shaft and disposed for activation by said trigger input, and plural switches coupled between said power inputs and outputs for coupling power therebetween, said switches being disposed adjacent the shaft of said timer for activation during shaft rotation; a first thermal battery having an input and having an output coupled to a first of said plural power inputs; and means coupled to said battery input for activating said battery.
Claim 3
Dependent Claim
37 words
A time delay initiator as set forth in claim 1 wherein said timing circuit further comprises actuator means coupled between said trigger input and said timer for activating said timer in response to an electrical trigger input.
Claim 4
Dependent Claim
35 words
A time delay initiator as set forth in claim 2 wherein said thermal battery further comprises an electric match coupled across said input terminals for initiating battery charging in response to a momentary electrical impulse.
Claim 5
Dependent Claim
42 words
A time delay initiator as set forth in claim 3 and further comprising a second thermal battery having the input thereof in parallel with the first battery input and having the output coupled to a second of said timing circuit power inputs.
Claim 6
Dependent Claim
79 words
A time delay initiator as set forth in claim 4 wherein said load circuitry includes first and second squib initiators for activating a rocket motor, and said plural switches are first and second singlepole double-throw switches having normally closed contacts coupled across said squib initiators for maintaining a short-circuit thereacross prior to activation of said switches, said switches being coupled to said batteries for individually placing the output of said batteries across respective squibs when said switches are activated.
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) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |