US3842742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical igniter with a ceramic or quartz element as source of electrical energy for shells or missiles,and particularly for small-caliber shells
Assignee: Rheinmetall Industrie AG
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Filing: 1973-06-29
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Granted: 1974-10-22
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Expires: 1993-06-29
Abstract
Abstract An electric ignition device, which comprises ceramic means having a piezo effect to constitute a source of electrical energy for small-caliber shells, and the ceramic means is formed as a ring.
Inventors
- 👤 H Harnau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:43
CPC Classifications
F; F42; F42C; F42C11/00; F42C11/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
137 words
An electric ignition device, comprising ceramic means having a piezo effect constituting a source of electrical energy for small-caliber shells, said ceramic means is formed as a ceramic ring, said ceramic ring being disposed in a tip of a shell and having an upper annular surface, an annular pressure piece, a pressure transmission tube provided in said tip of said shell and resting on said annular pressure piece, said pressure piece being seated flat on said upper annular surface of said ceramic ring, another ring supporting said ceramic ring from a bottom of the latter, a safety device, a wire means fastened to said another ring for producing an electrically conductive connection with said safety device, and said pressure piece having a milling forming an inner supporting edge for the inserted end of said pressure transmission tube.
Claim 2
Dependent Claim
137 words
An electric ignition device, comprising ceramic means having a piezo effect constituting a source of electrical energy for small-caliber shells, said ceramic means is formed as a ceramic ring, said ceramic ring being disposed in a tip of a shell and having an upper annular surface, an annular pressure piece, a pressure transmission tube provided in said tip of said shell and resting on said annular pressure piece, said pressure piece being seated flat on said upper annular surface of said ceramic ring, another ring supporting said ceramic ring from a bottom of the latter, a safety device, a wire means fastened to said another ring for producing an electrically conductive connection with said safety device, and said pressure piece having a milling forming an inner supporting edge for the inserted end of said pressure transmission tube.
Claim 3
Dependent Claim
21 words
The elctric ignition device, as set forth in claim 1, wherein said pressure transmission tube is widened in its central portion.
Claim 4
Dependent Claim
32 words
The elctric ignition device, as set forth in claim 2, wherein an annular damping member is placed in front of said pressure transmission tube in the shell tip under the impact surface.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |