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US4474113A Expired / Lapsed US ⏱️ 0.0 years remaining

Hollow charge of a directed explosion effect as well as method for the manufacture of the metallic cone of the hollow charge

Assignee: SICA Oy AB
•
Filing: 1982-09-21
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Granted: 1984-10-02
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Expires: 2002-09-21
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Abstract

Abstract The invention is concerned with a hollow charge of a directed explosion effect as well as with a method for the manufacture of the metallic cone of the hollow charge. The hollow charge (1) comprises a mantle (2) of the charge portion, an explosive material (3) fitted inside the mantle, a detonator (7) fitted at one end of the charge (1), and a metal cone (5) fitted at the opposite end of the charge (1). The mantle (2) of the hollow charge (1) and the metal cone (5) are precisely centered on a common symmetry axis (6). The detonator (7) is also positioned on the said symmetry axis (6). According to the invention, as viewed from the direction of the object to be blasted, the shape of the cone (5), made of pure copper, of the hollow charge (1) is in such a way differential that the convexity (a) of the wall (9) of the cone (5), whose thickness is uniform within the area of the entire cone, from the wall of a straight cone of equal cone angle is less than the thickness of the wall (9) of the copper cone (5), preferably about one half of the said thickness of the wall (9) .

Inventors

  • 👤 Kari Kyro
  • 👤 Reijo Levamaki
  • 👤 Pekka Sydanmaki

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 20:10
CPC Classifications
F; F42; F42B; F42B1/00; F42B1/02; F42B1/028

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 190 words
A hollow charge of a directed explosion effect, which charge comprises a mantel of the charge portion, an explosive material fitted inside the mantel, a detonator fitted at one end of the charge, and a metal cone fitted at the opposite end of the charge, the mantel of the charge and the metal cone being precisely centered on a common symmetry axis on which the detonator is also positioned, the metal cone including a concave globe face, wherein a detonation wave of the charge is spherical and, that as viewed from a direction of an object to be blasted, the cone is shaped so as to define a convexity in the cone wall with respect to a wall of a straight cone of equal cone angle, the cone wall being of uniform thickness and the convexity being less than the thickness of the wall and preferably about 1/2 of the thickness, so that when the hollow charge is exploded, a jet and a slug formed thereby obtain a velocity of about 2,500 to 3,500 meters per second when detonation velocity of the explosive is 7,000 to 8,000 meters per second.
Claim 2
Dependent Claim 190 words
A hollow charge of a directed explosion effect, which charge comprises a mantel of the charge portion, an explosive material fitted inside the mantel, a detonator fitted at one end of the charge, and a metal cone fitted at the opposite end of the charge, the mantel of the charge and the metal cone being precisely centered on a common symmetry axis on which the detonator is also positioned, the metal cone including a concave globe face, wherein a detonation wave of the charge is spherical and, that as viewed from a direction of an object to be blasted, the cone is shaped so as to define a convexity in the cone wall with respect to a wall of a straight cone of equal cone angle, the cone wall being of uniform thickness and the convexity being less than the thickness of the wall and preferably about 1/2 of the thickness, so that when the hollow charge is exploded, a jet and a slug formed thereby obtain a velocity of about 2,500 to 3,500 meters per second when detonation velocity of the explosive is 7,000 to 8,000 meters per second.
Claim 3
Dependent Claim 54 words
A hollow charge as claimed in claim 1, wherein the shape of the mantel is, at the end placed next to the cone, cylindrical and becomes narrower, having the shape of a truncated cone, towards the detonator so that the impact angle of the detonation wave in relation to the cone is almost constant.
Claim 4
Dependent Claim 14 words
A hollow charge as claimed in claim 2, wherein the metal cone is copper.

References Cited (Backward Citations)

US2441388A Cited
US2595960A Cited
US3027838A Cited
US3237559A Cited
US3224368A Cited
US4063512A Cited
US3431850A Cited
US4080898A Cited
DE2904155A1 Cited
GB2081851A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1987-10-02 1988-04-02 1988-10-02 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1991-10-02 1992-04-02 1992-10-02 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1995-10-02 1996-04-02 1996-10-02 $7700.00 Window Closed / Lapsed

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