Patent US4178855A successfully refreshed from Google Patents.
US4178855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Explosive actuated arming switch device
Assignee: United States Department of the Navy
•
Filing: 1978-03-20
•
Granted: 1979-12-18
•
Expires: 1998-03-20
Abstract
Abstract A conductor plated on a frangible substrate. The unit is potted in a silicon base compound, placed in a header, and attached to a printed circuit board. This assembly is then encased in a housing using epoxy resin potting compound. The circuit is protected from breakage due to mechanical shock by the epoxy resin but is immediately broken by an explosive shock wave which fractures the substrate and the conductor and opens the circuit.
Inventors
- 👤 James V. McVay
- 👤 Patrick A. Yates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:09
CPC Classifications
H; H01; H01H; H01H39/00; H01H39/006; F; F42; F42C; F42C15/00; F42C15/40
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
165 words
An arming system insensitive to mechanical shock which provides a predetermined arming signal upon termination of a preset electric current due to interruption by an explosive shock comprising; an explosive for creating an explosive shock wave; a frangible base in proximity to said explosive for sensing said explosive shock wave, such that said frangible base is shattered by said explosive shock wave; conducting means affixed to said frangible base for transmitting said preset electric current except when said frangible base is shattered; a resilient elastomeric compound placed between said frangible base and said explosive for cushioning said frangible base such that it is not shattered by mechanical shock; an electrical insulating pad placed over said conducting means for protecting said conducting means and said frangible base; housing means for supporting said cushioned and protected frangible base in proximity to said explosive; and potting compound in said housing means for imbedding said frangible base and resilient elastomeric compound in a fixed position within said housing means.
Claim 2
Dependent Claim
165 words
An arming system insensitive to mechanical shock which provides a predetermined arming signal upon termination of a preset electric current due to interruption by an explosive shock comprising; an explosive for creating an explosive shock wave; a frangible base in proximity to said explosive for sensing said explosive shock wave, such that said frangible base is shattered by said explosive shock wave; conducting means affixed to said frangible base for transmitting said preset electric current except when said frangible base is shattered; a resilient elastomeric compound placed between said frangible base and said explosive for cushioning said frangible base such that it is not shattered by mechanical shock; an electrical insulating pad placed over said conducting means for protecting said conducting means and said frangible base; housing means for supporting said cushioned and protected frangible base in proximity to said explosive; and potting compound in said housing means for imbedding said frangible base and resilient elastomeric compound in a fixed position within said housing means.
Claim 3
Dependent Claim
38 words
An arming system insensitive to mechanical shock as described in claim 1 wherein said conducting means comprises a nichrome layer deposited on said frangible base and a gold conductor deposited on said nichrome layer in a predetermined pattern.
Claim 4
Dependent Claim
20 words
An arming system insensitive to mechanical shock as described in claim 1 wherein said frangible base comprises a ceramic substrate.
Claim 5
Dependent Claim
18 words
An arming system insensitive to mechanical shock as described in claim 3 wherein said ceramic substrate comprises alumina.
Claim 6
Dependent Claim
21 words
An arming system insensitive to mechanical shock as described in claim 1 wherein said electrical insulating pad comprises cured epoxy resin.
Claim 7
Dependent Claim
20 words
An arming system insensitive to mechanical shock as described in claim 1 wherein said potting compound is uncured epoxy resin.
Claim 8
Dependent Claim
22 words
An arming system insensitive to mechanical shock as described in claim 1 wherein said resilient elastomeric compound is a silicon bonding compound.
Claim 9
Dependent Claim
52 words
An arming system insensitive to mechanical shock as described in either of claims 1, 2, 3, 4, 5, 6 or 7 wherein said conducting means is on the opposite side of said frangible base from said resilient elastomeric compound for insuring a break in circuit continuity when said frangible base is shattered.
Claim 10
Dependent Claim
205 words
An arming system insensitive to mechanical shock which provides a predetermined arming signal upon termination of a preset electric current due to interruption by explosive shock comprising: an explosive for creating an explosive shock wave; a ceramic substrate in proximity to said explosive for sensing said explosive shock wave, such that said ceramic substrate is shattered by said explosive shock wave; a metallic layer deposited on said ceramic substrate for providing a firm conducting base, said metallic layer deposited on the opposite side of said ceramic substrate from said explosive; a gold conductor of predetermined shape deposited on said metallic layer for creating a preferred current path for said preset electric current; a silicon bonding compound placed between said ceramic substrate and said explosive for cushioning said ceramic base such that it is not shattered by mechanical shock; a cured epoxy resin electrical insulating pad placed over said gold conductor for protecting said conductor and said ceramic substrate; housing means for supporting said cushioned and protected ceramic substrate and conductor in predetermined proximity to said explosive; and an uncured epoxy resin potting compound in said housing means for imbedding said ceramic substrate and said resilient elastomeric compound in a fixed position within said housing means.
Claim 11
Dependent Claim
205 words
An arming system insensitive to mechanical shock which provides a predetermined arming signal upon termination of a preset electric current due to interruption by explosive shock comprising: an explosive for creating an explosive shock wave; a ceramic substrate in proximity to said explosive for sensing said explosive shock wave, such that said ceramic substrate is shattered by said explosive shock wave; a metallic layer deposited on said ceramic substrate for providing a firm conducting base, said metallic layer deposited on the opposite side of said ceramic substrate from said explosive; a gold conductor of predetermined shape deposited on said metallic layer for creating a preferred current path for said preset electric current; a silicon bonding compound placed between said ceramic substrate and said explosive for cushioning said ceramic base such that it is not shattered by mechanical shock; a cured epoxy resin electrical insulating pad placed over said gold conductor for protecting said conductor and said ceramic substrate; housing means for supporting said cushioned and protected ceramic substrate and conductor in predetermined proximity to said explosive; and an uncured epoxy resin potting compound in said housing means for imbedding said ceramic substrate and said resilient elastomeric compound in a fixed position within said housing means.
References Cited (Backward Citations)
US3072500A
Cited
US3905015A
Cited
US3846823A
Cited
US3745276A
Cited
US3751613A
Cited
US3824328A
Cited
US4088828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-17 | 1983-06-18 | 1983-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-17 | 1987-06-18 | 1987-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-17 | 1991-06-18 | 1991-12-18 | $7700.00 | Window Closed / Lapsed |