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US3726221A
Expired / Lapsed
US
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Percussion primer anvil
Assignee: United States Department of the Army
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Filing: 1971-06-02
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Granted: 1973-04-10
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Expires: 1991-06-02
Abstract
Abstract A fail-proof anvil for use in a percussion type primer of a cartridge consisting of a cylindrical metal member having both ends of identical configuration. Each end is recessed then converging towards its center to a rounded point. Flash passages are provided to permit combustion products of the initiating charge to initiate the cartridge propellant. The anvil design prevents accidental inverted insertion thereof in a primer during its assembly.
Inventors
- 👤 W White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:44
CPC Classifications
F; F42; F42C; F42C19/00; F42C19/08; F42C19/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
197 words
The combination with a cartridge which includes a case and a propellant in the case, the case having a base provided with a primer recess and a flash passage connecting the recess with the propellant, of a percussion primer in said recess, said primer comprising an outer cup of a size and shape to fit snugly within the recess, an anvil disposed within the cup and having a periphery of a size and shape to fit snugly within the side walls of the cup, said anvil being double-ended, each end of which is provided with a recessed central portion forming a raised rounded point in its center, the recessed central portion of the anvil providing a circumferential rim which is spaced axially beyond the adjacent raised rounded point in the recessed portion of the anvil, the anvil having a flash port within the circumferential rim and connecting the recessed portions at each end of the anvil, and an initiating charge disposed in the primer between and in contact with the outer end of the cup and the adjacent circumferential rim, recessed portion and rounded point of the anvil to provide a primer having central and peripheral sensitivity.
Claim 2
Dependent Claim
197 words
The combination with a cartridge which includes a case and a propellant in the case, the case having a base provided with a primer recess and a flash passage connecting the recess with the propellant, of a percussion primer in said recess, said primer comprising an outer cup of a size and shape to fit snugly within the recess, an anvil disposed within the cup and having a periphery of a size and shape to fit snugly within the side walls of the cup, said anvil being double-ended, each end of which is provided with a recessed central portion forming a raised rounded point in its center, the recessed central portion of the anvil providing a circumferential rim which is spaced axially beyond the adjacent raised rounded point in the recessed portion of the anvil, the anvil having a flash port within the circumferential rim and connecting the recessed portions at each end of the anvil, and an initiating charge disposed in the primer between and in contact with the outer end of the cup and the adjacent circumferential rim, recessed portion and rounded point of the anvil to provide a primer having central and peripheral sensitivity.
Claim 3
Dependent Claim
44 words
The device of claim 1 in which the outer end of the primer cup is of convex formation to provide a substantial space between the adjacent circumferential rim and the convex end of the cup for the reception of part of the initiating charge.
Claim 4
Dependent Claim
26 words
The device of claim 1 in which the primer recess in the cartridge case, the primer cup and the primer anvil are all of cylindrical shape.
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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |