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Patent US4719859A successfully refreshed from Google Patents.
US4719859A
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US
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Training cartridge
Assignee: Dynamit Nobel AG
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Filing: 1985-10-23
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Granted: 1988-01-19
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Expires: 2005-10-23
Abstract
Abstract A training cartridge includes a metallic cartridge case with a case shoulder and dummy projectile having a gas exhaust opening at its front end. A propellant charge powder chamber of the cartridge case is closed in the forward direction by means of a cup-shaped closure element that is inserted in the cartridge case close to the case shoulder and that bursts or ruptures during firing under the action of the powder gases along predetermined intentional breaking zones. Toward the rear, the powder chamber is sealed by means of a bottom piece inserted in the cartridge case. By placing the intentional opening zones into the interior of the cartridge, danger of injury by the ejected cartridge case is reduced to a minimum.
Inventors
- 👤 Kurt Ballreich
- 👤 Ernst Jensen
- 👤 Helmut Neubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:33
CPC Classifications
F; F42; F42B; F42B8/00; F42B8/02; F42B8/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
145 words
A training cartridge comprising a metallic cartridge case having a case shoulder and a hollow dummy projectile integrally formed at one end and an open propellant charge powder chamber integrally formed at the other end, said hollow dummy projectile having at least one gas exhaust opening formed therein which is free of externally projecting, sharp-edged rims; a rupturable cup-shaped closure element tightly fitted into the cartridge case for sealing off the propellant charge powder chamber at forward end of the chamber, said closure element having means for defining predetermined intentional breaking zones which rupture during firing; and a bottom closure member which is tightly fitted into the cartridge case and which seals off the propellant charge powder chamber at the rear end of the chamber; said cartridge case being free of deformation in the vicinity of the hollow dummy projectile when a cartridge is fired.
Claim 2
Dependent Claim
145 words
A training cartridge comprising a metallic cartridge case having a case shoulder and a hollow dummy projectile integrally formed at one end and an open propellant charge powder chamber integrally formed at the other end, said hollow dummy projectile having at least one gas exhaust opening formed therein which is free of externally projecting, sharp-edged rims; a rupturable cup-shaped closure element tightly fitted into the cartridge case for sealing off the propellant charge powder chamber at forward end of the chamber, said closure element having means for defining predetermined intentional breaking zones which rupture during firing; and a bottom closure member which is tightly fitted into the cartridge case and which seals off the propellant charge powder chamber at the rear end of the chamber; said cartridge case being free of deformation in the vicinity of the hollow dummy projectile when a cartridge is fired.
Claim 3
Dependent Claim
45 words
The training cartridge according to claim 1 wherein the shoulder case is located between the dummy projectile and the propellant charge powder chamber, said closure element being arranged in the cartridge case in an at least essentially cylindrical region immediately subjacent to the case shoulder.
Claim 4
Dependent Claim
25 words
The training cartridge according to claim 1, wherein the area of the hollow dummy projectile surrounding the at least one opening is free of crimping.
Claim 5
Dependent Claim
33 words
The training cartridge according to claim 1, wherein said at least one gas exhaust opening is a single gas opening, the diameter of which is about 30-70% of the caliber of the projectile.
Claim 6
Dependent Claim
23 words
The training cartridge according to claim 1, wherein the cartridge case is a thin-walled metallic casing formed by deep drawing a metal strip.
Claim 7
Dependent Claim
34 words
The training cartridge according to claim 1, wherein a closure element has a bottom portion of a circular-disk shape and a cylindrical jacket portion; said bottom portion being provided with said intentional breaking zones.
Claim 8
Dependent Claim
16 words
The training cartridge according to claim 1, wherein the bottom closure member is a metallic member.
References Cited (Backward Citations)
DE74314C
Cited
DE68733C
Cited
US2959130A
Cited
DE964386C
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FR1241334A
Cited
FR1448834A
Cited
SE308464B
Cited
AT350941B
Cited
DE3048599A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-18 | 1991-07-20 | 1992-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-18 | 1995-07-20 | 1996-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-18 | 1999-07-20 | 2000-01-19 | $7700.00 | Window Closed / Lapsed |