US5115716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic percussion primer feed mechanism
Assignee: FMC Corp
•
Filing: 1990-01-29
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Granted: 1992-05-26
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Expires: 2010-01-29
Abstract
Abstract A primer feed mechanism for automatically feeding unfired primers to, and extracting fired primers from, an artillery piece. A magazine having a rotatable cylindrical drum carrying a plurality of primer cartridges is detachably mounted adjacent the breach block of an artillery piece. A user actuable release handle controls movement of a reciprocable mounted camplate. Movement of the camplate in one direction indexes the rotatable drum to align a fresh primer cartridge with the firing chamber of the artillery piece. Such movement of the camplate also drives a rearwardly positioned bolt toward the breach block of the artillery piece thereby driving the unfired primer cartridge into the firing chamber. Movement of the camplate in the opposite direction causes the bolt to extract the fired primer cartridge from the firing chamber and back into the magazine drum.
Inventors
- 👤 Timothy J. Doering
- 👤 David R. Zappa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:20
CPC Classifications
F; F41; F41A; F41A19/00; F41A19/57; F41A9/00; F41A9/01; F41A9/24; F41A9/26; F41A9/38; F41A9/39
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
A primer feed mechanism for an artillery piece with a firing chamber for receiving a primer comprising: a magazine including a hub and a substantially cylindrical drum rotatably mounted about said hub, said drum including a plurality of openings, each of said openings adapted to receive a primer cartridge; releasable mounting means for releasably mounting said hub to the breech end of the artillery piece; actuating means, including bolt means, for individually displacing unfired primers from one of said openings into the firing chamber and for returning fired primers from the firing chamber into said one of said openings.
Claim 2
Dependent Claim
99 words
A primer feed mechanism for an artillery piece with a firing chamber for receiving a primer comprising: a magazine including a hub and a substantially cylindrical drum rotatably mounted about said hub, said drum including a plurality of openings, each of said openings adapted to receive a primer cartridge; releasable mounting means for releasably mounting said hub to the breech end of the artillery piece; actuating means, including bolt means, for individually displacing unfired primers from one of said openings into the firing chamber and for returning fired primers from the firing chamber into said one of said openings.
Claim 3
Dependent Claim
29 words
A primer feed mechanism as defined in claim 1 further comprising indexing means for rotating said drum around said hub in response to each operation of said actuating means.
Claim 4
Dependent Claim
29 words
A primer feed mechanism as defined in claim 1 wherein the artillery piece includes a breech block and wherein said mounting means mounts said magazine adjacent the breech block.
Claim 5
Dependent Claim
31 words
A primer feed mechanism as defined in claim 3 wherein the breech block is carried on a hinged breech carrier and wherein said mounting means are mountable on said breech carrier.
Claim 6
Dependent Claim
55 words
A primer feed mechanism as in claim 1, further comprising: a firing pin for conveying an impulse from a firing mechanism to the primer to cause the primer to fire; a plurality of firing mechanisms; and, a firing lock for conveying an impulse from any of said plurality of firing mechanisms to said firing pin.
Claim 7
Dependent Claim
20 words
A primer feed mechanism as in claim 5, in which one of said firing mechanisms is a solenoid firing mechanism.
Claim 8
Dependent Claim
20 words
A primer feed mechanism as in claim 6 in which one of said firing mechanisms is a mechanical firing mechanism.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |