U.S. patent application number 09/915788 was filed with the patent office on 2002-01-31 for pyrotechnic impact fuse.
This patent application is currently assigned to Diehl Munitionssysteme GmbH & Co. KG. Invention is credited to Rudolf, Karl, Schildknecht, Manfred, Strauss, Hans, Wild, Roland.
Application Number | 20020011173 09/915788 |
Document ID | / |
Family ID | 7650541 |
Filed Date | 2002-01-31 |
United States Patent
Application |
20020011173 |
Kind Code |
A1 |
Schildknecht, Manfred ; et
al. |
January 31, 2002 |
Pyrotechnic impact fuse
Abstract
An explosive having cavities (16) is proposed for a pyrotechnic
impact fuse (100) for high explosive shells (1). The sensitivity of
the explosive lies in the class of secondary explosives, due to the
cavities (16). Mechanical safety means can therefore be
eliminated.
Inventors: |
Schildknecht, Manfred;
(Eckental, DE) ; Rudolf, Karl; (Schrobenhausen,
DE) ; Strauss, Hans; (Reichenschwand, DE) ;
Wild, Roland; (Swissttal, DE) |
Correspondence
Address: |
Leopold Presser
Scully, Scott, Murphy & Presser
400 Garden City Plaza
Garden City
NY
11530
US
|
Assignee: |
Diehl Munitionssysteme GmbH &
Co. KG
Rothenbach
DE
|
Family ID: |
7650541 |
Appl. No.: |
09/915788 |
Filed: |
July 26, 2001 |
Current U.S.
Class: |
102/478 |
Current CPC
Class: |
F42C 1/10 20130101 |
Class at
Publication: |
102/478 |
International
Class: |
F42B 012/02; F42B
012/08 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 28, 2000 |
DE |
100 36 815.8 |
Claims
1. A pyrotechnic impact fuse (100) for high explosive shells and
shells with an impact function with a pyrotechnic firing means (13)
in a cap (6), and an explosive charge (5) for breaking up the shell
(1), wherein the firing means (13) surrounds an anvil (7) at the
shell side, characterised in that a mouldable or pressable
explosive has uniformly distributed, defined cavities (16; 32) of a
diameter of 0.2 to 1.2 mm.
2. An impact fuse according to claim 1 characterised in that
suitable explosives are HWC, hexogen, wax graphite, ocfol, octol,
PHX, plastic-bound explosive, or PETN, nitropenta.
3. An impact fuse according to claim 1 characterised in that the
cavities (16) are defined by glass balls, styropor bodies, the
addition of polyurethane, the supply of gas in the casting or
moulding operation or by means of bores (32) which are disposed
transversely with respect to the axis (31) of the explosive body
(30).
Description
[0001] The invention concerns a pyrotechnic impact fuse as set
forth in the classifying portion of claim 1.
[0002] A pyrotechnic percussion or impact fuse is known from DE 196
51 169 A1. Disposed in a ballistic cap of a high explosive shell on
a so-called anvil is a secondary explosive 28 which is commercially
available but which is made especially fireable or detonatable.
That secondary explosive is not defined in greater detail.
[0003] There the object of the invention is to propose an explosive
which explodes upon impact on a target.
[0004] That object is attained in accordance with claim 1.
[0005] Advantageous developments of the invention are set forth in
the appendant claims.
[0006] In accordance with the invention, the impact detonating or
firing means is a conventional explosive but with uniformly
distributed, defined cavities. Due to those cavities of a diameter
of from 0.2 -1.2 mm, the sensitivity of the explosive is below the
sensitivity of tetryl. Tetryl is referred to as a secondary
explosive and does not require any special mechanical safety means,
as is required in the case of conventional explosive, fitted in
fuses.
[0007] The cavities in the primary explosive are defined in a
simple manner by glass balls, styropor balls, addition of
polyurethane, the addition of gas in the casting or moulding
procedure or by virtue of bores which are disposed transversely
with respect to the main axis of the explosive body.
[0008] The invention is based on the operative principle that, upon
impact of the projectile, shock wave initiation of explosive occurs
due to imploding pores or cavities in the explosive mixture.
[0009] Embodiments of the invention are described hereinafter and
illustrated in the drawing in which:
[0010] FIG. 1 is a view in longitudinal section of a high explosive
shell, FIG. 2 is a phase illustration, and FIG. 3 is a simplified
view of an explosive charge.
[0011] Referring to FIG. 1, a high explosive shell 1 comprises a
casing 2 with a guide band 3, a base-screw 4, a main charge 5 of
explosive and a cap 6.
[0012] The cap 6 and an anvil 7 are connected to a screw threaded
ring 8 on the shell side.
[0013] The anvil 7 has a plurality of firing or detonation passages
10. They connect a space 11 at the cap side, to a conical recess 12
of the anvil 7.
[0014] The firing passages 10 are closed by foils 9 of metal such
as aluminium.
[0015] A structured explosive 13, 15 of PETN, nitropenta, with
cavities 16, is disposed in the space 11 and likewise the conical
recess 12. A conventional explosive can also be arranged in the
recess 12. The cavities 16 are defined by suitable bodies of
styropor.
[0016] FIG. 2 shows the firing or detonation progression of the
explosive 13 which is structured in accordance with the invention,
upon on-target impact 17 of the shell 1.
[0017] A shockwave 20 which is shown by way of example produces
firing or detonation potentials 21 in the phase 1 which is
identified by reference 22, in the structured explosive 13, and
causes partial firing 17 in the cavities 16, due to shockwave
initiation.
[0018] In phase 2, see reference numeral 23, the fire sources 17.1
have expanded and form a detonation front 25 which extends in the
space 11, see also FIG. 1.
[0019] When the detonation front 25 reaches the foils 9 at the
firing passages 10, the procedure then involves firing through to
the explosive charge 15 in the conical recess 12. That then causes
detonation of the main charge 5 which breaks up the casing 2 into
fragments (not shown).
[0020] As shown in FIG. 3, a test body 30 of PHX, plastic-bound
explosive, has bores 32 which are disposed transversely with
respect to its longitudinal axis 31. Conversion of the explosive
into detonation energy occurs in the direction of the arrow 33.
That takes place in the same manner as described with reference to
FIG. 2.
[0021] All military explosives are suitable as the explosives.
* * * * *