US3661085A
Expired / Lapsed
US
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Electrically actuated initiator
Assignee: Ensign Bickford Aerospace Corp
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Filing: 1969-09-19
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Granted: 1972-05-09
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Expires: 1989-09-19
Abstract
Abstract A fast response electrically actuated pyrotechnic or explosive initiator includes an initiating charge in contact with only those portions of a bridge wire located immediately adjacent the area of wire contact with the terminal posts.
Inventors
- 👤 William M Smith
- 👤 Thomas W Norton
- 👤 John D Hawley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:42
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/12; F42B3/124
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
An electrically actuated initiator having an ignition time of less than 1 millisecond comprising a generally tubular casing, a pair of electrical terminals secured within the casing, a bridge wire having end portions electrically connected to the terminals within the casing and a central portion integrally connecting the end portions, and an initiating charge in intimate contact with the bridge wire within the area adjacent the end portion thereof and having a central cavity, the central portion of the bridge wire being positioned within said central cavity.
Claim 2
Dependent Claim
87 words
An electrically actuated initiator having an ignition time of less than 1 millisecond comprising a generally tubular casing, a pair of electrical terminals secured within the casing, a bridge wire having end portions electrically connected to the terminals within the casing and a central portion integrally connecting the end portions, and an initiating charge in intimate contact with the bridge wire within the area adjacent the end portion thereof and having a central cavity, the central portion of the bridge wire being positioned within said central cavity.
Claim 3
Dependent Claim
14 words
The initiator of claim 1 wherein the initiating charge is a centrally apertured pellet.
Claim 4
Dependent Claim
17 words
The initiator of claim 1 including a main charge positioned adjacent the initiating charge for ignition thereby.
Claim 5
Dependent Claim
13 words
the initiator of claim 1 wherein the initiating charge is a pyrotechnic material.
Claim 6
Dependent Claim
23 words
The initiator of claim 4 wherein the pyrotechnic material is a mixture selected from the group consisting of zirconium-potassium chlorate and boron-lead oxide.
Claim 7
Dependent Claim
47 words
The initiator of claim 1 wherein the bridge wire has a resistance of about 1 ohm, the initiating charge is a centrally apertured compacted pellet consisting of a mixture of zirconium and potassium chlorate and the ignition time for the initiator is about 0.2 millisecond and less.
Claim 8
Dependent Claim
19 words
The initiator of claim 1 wherein an air space is provided around the central portion of the bridge wire.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |