US4481886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow charge
Assignee: Saab Bofors AB
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Filing: 1983-01-14
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Granted: 1984-11-13
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Expires: 2003-01-14
Abstract
Abstract This invention relates to a hollow charge for a missile, projectile, shell or the like. The invention is particularly intended to be used on a missile which is arranged to pass a target and the hollow charge initiated when the missile is over, at the side of or under the target which means that the hollow charge is inclined with respect to the longitudinal axis (13) of the missile. The hollow charge comprises an inner, jet-forming, trumpet-shaped cone member (3) and an outer casing (2) having a substantially straight cylindrical part (8) connected to a conical tapered part (9, 10) to give the hollow charge jet an extremely high front tip velocity as well as a low velocity gradient.
Inventors
- 👤 Leif Brattstrom
- 👤 Kjell Mattsson
- 👤 Bertil Arvidsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:01
CPC Classifications
F; F42; F42B; F42B1/00; F42B1/02; F42B1/028
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
161 words
A hollow charge for a missile, projectile, shell or the like, comprising: a charge body of explosive material, said charge body having a total length; an inner jet-forming trumpet-shaped cone member formed within and opening outwardly at one end of said charge body, said trumpet-shaped cone member having a length and a generatrix tangent angle in the range of 10 degrees to 15 degrees; and an outer casing enclosing said charge body, said casing having a substantially straight cylindrical part extending along said charge body from said one end, said cylindrical part being connected to a conical, tapered part extending further along said charge body, the ratio between said length of said trumpet-shaped cone member and said total length of said charge body being approximately 0.8:1; whereby a hollow charge jet generated on ignition of said charge body has a front tip velocity of approximately 10000 m/s and a velocity gradient lower than would be obtained by a straight cone member.
Claim 2
Dependent Claim
161 words
A hollow charge for a missile, projectile, shell or the like, comprising: a charge body of explosive material, said charge body having a total length; an inner jet-forming trumpet-shaped cone member formed within and opening outwardly at one end of said charge body, said trumpet-shaped cone member having a length and a generatrix tangent angle in the range of 10 degrees to 15 degrees; and an outer casing enclosing said charge body, said casing having a substantially straight cylindrical part extending along said charge body from said one end, said cylindrical part being connected to a conical, tapered part extending further along said charge body, the ratio between said length of said trumpet-shaped cone member and said total length of said charge body being approximately 0.8:1; whereby a hollow charge jet generated on ignition of said charge body has a front tip velocity of approximately 10000 m/s and a velocity gradient lower than would be obtained by a straight cone member.
Claim 3
Dependent Claim
65 words
A charge according to claim 1, wherein said substantially straight cylindrical part of said outer casing is connected to a first conical tapered part making an angle α to said substantially straight cylindrical part, and said first conical tapered part is connected to second conical tapered part which makes an angle β to said first conical tapered part, angle β being smaller than angle α.
Claim 4
Dependent Claim
161 words
An ammunition unit, comprising: a hollow body; a charge body of explosive material positioned within said hollow body, said charge body having a total length; an inner jet-forming trumpet-shaped cone member formed within and opening outwardly at one end of said charge body, said trumpet-shaped cone member having a length and a generatrix tangent angle in the range of 10 degrees to 15 degrees; and an outer casing enclosing said charge body, said casing having a substantially straight cylindrical part extending along said charge body from said one end, said cylindrical part being connected to a conical, tapered part extending further along said charge body, the ratio between said length of said trumpet-shaped cone member and said total length of said charge body being approximately 0.8:1; whereby a hollow charge jet generated on ignition of said charge body has a front tip velocity of approximately 10000 m/s and a velocity gradient lower than would be obtained by a straight cone member.
Claim 5
Dependent Claim
161 words
An ammunition unit, comprising: a hollow body; a charge body of explosive material positioned within said hollow body, said charge body having a total length; an inner jet-forming trumpet-shaped cone member formed within and opening outwardly at one end of said charge body, said trumpet-shaped cone member having a length and a generatrix tangent angle in the range of 10 degrees to 15 degrees; and an outer casing enclosing said charge body, said casing having a substantially straight cylindrical part extending along said charge body from said one end, said cylindrical part being connected to a conical, tapered part extending further along said charge body, the ratio between said length of said trumpet-shaped cone member and said total length of said charge body being approximately 0.8:1; whereby a hollow charge jet generated on ignition of said charge body has a front tip velocity of approximately 10000 m/s and a velocity gradient lower than would be obtained by a straight cone member.
Claim 6
Dependent Claim
67 words
An ammunition unit according to claim 3, wherein said substantially straight cylindrical part of said outer casing is connected to a first conical tapered part making an angle α to said substantially straight cylindrical part, and said first conical tapered part is connected to a second conical tapered part which makes an angle β to said first conical tapered part, angle β being smaller than angle α.
Claim 7
Dependent Claim
22 words
An ammunition unit according to claim 3, wherein said hollow charge is inclined with respect to the longitudinal axis of the unit.
References Cited (Backward Citations)
BE540824A
Cited
GB883664A
Cited
GB916870A
Cited
GB884104A
Cited
DE1478008A1
Cited
GB1100374A
Cited
US3224368A
Cited
US3976010A
Cited
GB1558058A
Cited
GB1588077A
Cited
US4374495A
Cited
US4338713A
Cited
GB2081851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-13 | 1988-05-14 | 1988-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-13 | 1992-05-14 | 1992-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-13 | 1996-05-14 | 1996-11-13 | $7700.00 | Window Closed / Lapsed |