Pyrotechnic object

Abstract

The present disclosure relates to a pyrotechnic object, in particular an irritation body, irritation projectile or ammunition, comprising an ignition device, comprising a delay chamber extending along a delay path, in which chamber a delay charge is accommodated, and comprising at least one and preferably a plurality of effect chambers in which or in each of which an effect charge to be ignited is accommodated, wherein the delay chamber is transversely connected to a respective effect chamber via a respective over-ignition opening which branches off from the delay chamber and forms an over-ignition path, wherein in the case of a plurality of effect chambers the plurality of over-ignition openings are arranged successively downstream along the delay path in the order of the effect charges to be ignited.

Claims

1. A pyrotechnic object comprising: an ignition device; a delay chamber for housing a delay charge, the delay chamber extending from the ignition device along a delay path; and at least one effect chamber accommodating an effect charge to be ignited, the delay chamber transversely connected to the effect chamber via an over-ignition opening which branches off from the delay chamber and forms an over-ignition path between the delay chamber and the effect chamber, wherein an over-ignition charge that differs and chemically deviates from the effect charge is introduced into the over-ignition opening to at least partially close the over-ignition opening after combustion of the over-ignition charge and by combustion residue of the over-ignition charge, and to reduce or dampen a propagation of a pressure shock which is produced as a result of an ignition of the effect charge in the effect chamber and acts on the delay chamber via the over-ignition opening.

2. The pyrotechnic object according to claim 1, wherein the over-ignition charge is introduced into the over-ignition opening over at least 20%, of the length of the over-ignition path.

3. The pyrotechnic object according to claim 1, wherein the over-ignition charge is pressed into the over-ignition opening.

4. The pyrotechnic object according to claim 1, wherein the over-ignition charge is introduced into the over-ignition opening as a pasty medium or a flowable medium and is cured therein.

5. The pyrotechnic object according to claim 1, wherein the over-ignition opening has a cross-sectional change along the over-ignition path.

6. The pyrotechnic object according to claim 5, wherein the cross-sectional change of the over-ignition opening is a cross-sectional area that changes along the over-ignition path by at least 10%.

7. The pyrotechnic object according to claim 5, wherein the cross-sectional change is oriented such that the over-ignition opening has, in an ignition propagation direction towards the effect chamber, an increasing cross-sectional area.

8. The pyrotechnic object according to claim 5, wherein the cross-sectional change is conical-shaped or funnel-shaped.

9. The pyrotechnic object according to claim 5, wherein the over-ignition opening is a stepped opening.

10. The pyrotechnic object according to claim 5, wherein the over-ignition charge is arranged in a region of the cross-sectional change such that immobilization and anchorage of the combustion residue of the over-ignition charge in the over-ignition opening is assisted by the cross-sectional change.

11. The pyrotechnic object according to claim 5, wherein the cross-sectional change of the over-ignition opening is a cross-sectional area that changes along the over-ignition path by at least 25%.

12. The pyrotechnic object according to claim 5, wherein the cross-sectional change of the over-ignition opening is a cross-sectional area that changes along the over-ignition path by at most 60%.

13. The pyrotechnic object according to claim 1, further comprising a housing inner body defining the delay chamber and the effect chamber and an outer sleeve body surrounding the housing inner body, the outer sleeve body having a grippable outer side of the object.

14. The pyrotechnic object according to claim 13, wherein the outer sleeve body is cylindrical.

15. The pyrotechnic object according to claim 13, wherein the outer sleeve body is configured to seal one or more openings communicating with the delay chamber and the effect chamber.

16. The pyrotechnic object according to claim 1, wherein: the at least one effect chamber includes a plurality of effect chambers accommodating effect charges to be ignited; the delay chamber is transversely connected to the plurality of effect chambers via a plurality of over-ignition openings including the over-ignition opening; and the plurality of over-ignition openings are arranged successively downstream along the delay path in the order of the effect charges to be ignited.

17. The pyrotechnic object according to claim 1, wherein the over-ignition charge is introduced into the over-ignition opening over at least 30% of the length of the over-ignition path.

18. The pyrotechnic object according to claim 17, wherein the over-ignition charge is introduced into the over-ignition opening over at most 90% of the length of the over-ignition path.

19. The pyrotechnic object according to claim 1, wherein the over-ignition charge is introduced into the over-ignition opening over at least 50% of the length of the over-ignition path.

20. The pyrotechnic object according to claim 1, wherein the pyrotechnic object is one of an irritation body, irritation projectile or ammunition.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a longitudinal sectional view of a pyrotechnic object designed according to the invention, and

(2) FIG. 2 shows an enlarged detail from FIG. 1.

DETAILED DESCRIPTION

(3) The pyrotechnic object 2 which is shown in the figures and designed according to the invention, for example in the form of a BTV (bottom top venting) irritation projectile 4 (i.e., which has the blow-out direction upwards and downwards or in axially opposite directions), comprises an ignition device 6 of a design that is known per se. The ignition device 6 comprises a manually holdable or pressable and releasable rocker arm 8, a pull-off securing ring (not shown), a spring 10, a striking piece 12 and a primer cap 14 which are of a design that is already known, and which are therefore not described in more detail. A delay chamber 16, which is designed in this case for example as a bore, extends axially below the primer cap 14 along a delay path 18 in which at least one delay charge 20 is arranged. In the case shown by way of example, the delay chamber 16 extends along an axial longitudinal direction 24 within, specifically centrally within, a housing inner body 22 which is shown by way of example as solid, and in so doing forms and thus delimits the delay path 18. Effect chambers 26 which also extend in the axial longitudinal direction 24 and are arranged in the manner of a revolver and concentrically with respect to the delay chamber 16 are provided radially outside the delay chamber 16, but only one of these corresponding to the sectional plane is shown in FIG. 1. An effect charge 28 to be ignited is present in each of the effect chambers 26, preferably in the form of a uniformly introduced particle material.

(4) In this application, when an effect charge or an effect charge material is mentioned, this can be, for example, a flash charge and/or a bang charge and/or a smoke charge as an explosive.

(5) A respective effect chamber 26 is connected to the centrally arranged delay chamber 16 via a respective over-ignition opening 30. The over-ignition opening 30 is designed in this case as a bore. As intended, a combustion front of the delay charge 20 is meant to propagate along the delay path 18 in the axial longitudinal direction 24 starting from the ignition device 6. When the combustion front reaches the first or a subsequent over-ignition opening 30, for example branching off radially in this case, the effect charge 28 is intended to be ignited in the intended manner in the associated effect chamber 26 by igniting through this over-ignition opening 30. In this case, in FIG. 1, the effect charge which explodes by ignition is ejected, together with the intended effect associated therewith, upwards and downwards in the axial longitudinal direction 24 as intended.

(6) At the same time, the combustion front also propagates axially in the delay chamber 16 until it reaches the next over-ignition opening 30 in the direction of the delay path 18 and, in the same way, as intended, causes an ignition of the effect charge 28 in the associated effect chamber 26.

(7) While the over-ignition opening 30 has since been left open, so that the ejected hot particles of the combustion front could propagate as unimpeded as possible through the over-ignition opening 30 into the associated effect chamber 26 and could lead to the ignition of the effect charge 28 provided therein, it is now proposed according to the invention that an over-ignition charge 32 is deliberately introduced into the over-ignition opening 30, specifically at least along part of the extension of the over-ignition opening 30 or the over-ignition path 34 formed thereby (FIG. 2), which is effective for the purposes to be illustrated below. The introduction of the over-ignition charge 32 into the over-ignition opening 30 makes it possible to also ensure that significantly more hot particles propagate through the over-ignition opening 30 towards the effect chamber 26 and lead to the reliable ignition of the effect charge 28. Furthermore, a combustion residue 36 within the region 38 of the over-ignition opening 30 in which the ignition charge 32 is or was arranged is produced by the over-ignition charge 32 burning off. The combustion residue 36 therefore preferably comprises a not insubstantial portion of slag which can stop and become wedged within the over-ignition opening 30. When the effect charge 28 is ignited, a considerable pressure shock is produced which propagates not only in the axial longitudinal direction 24 but also through the over-ignition opening 30. This pressure shock results in a compression of the combustion residue 36 within the over-ignition opening 30 in a manner according to the invention. This means that the combustion residue 36 helps to reduce or dampen the effects and propagation of the pressure shock through the over-ignition opening 30 back towards the delay chamber 16. This proves to be advantageous in terms of the improvement of the reliability of the intended ignitions of the effect charges in order, as shown in detail in the introduction.

(8) As can be seen from the figures, the over-ignition opening 30 has a cross-sectional change 40 along the extension of the over-ignition path 34, and the cross-sectional change 40 is preferably oriented such that the over-ignition opening 30 has, in the ignition propagation direction, i.e., towards the effect chamber 26, an increasing cross-sectional area. In FIG. 2, the cross-sectional change 40 is conical or funnel-shaped. This shape can be formed, for example, in the form of a recessed bore, by a radial bore being introduced into the housing inner body 22 from radially outside, first using a drill having a small diameter and then a drill having a larger diameter. In this case, the shape of the cross-sectional change 40 can also be achieved by machining. In the case shown by way of example, access from radially outside is achieved through a further radial opening 42 in the housing inner body 22, which is then closed by a blind rivet 44. The housing inner body 22 receives, radially outside, a cylindrical sleeve body 46 which forms a manually grippable outer side 48 of the object 2 and, by way of example, securely seals the further radial openings 42 against environmental influences by means of two O-ring seals 50.

(9) If the over-ignition charge, as shown, is arranged in the region of the cross-sectional change 40 and is preferably immobilized there, the effect of the combustion residue 36 of the over-ignition charge 32 that reduces or damps the pressure shock is particularly effective. As a result of the pressure shock, the combustion residue 36 is, as also already shown at the outset, partially compressed, as a result of which the particles of the combustion residue 36 in the over-ignition opening 30 become wedged against each other and become an obstacle that is more difficult to overcome by pressure. As a result, the delay charge 20 located in the delay chamber 16 and its intended further advancing combustion front are better protected from the effects of the pressure shock. This makes it possible to significantly improve the functional safety and reliability of the ignition of the following effect charges 28.