Patent ID: 12196536

DETAILED DESCRIPTION

The pyrotechnic object2which is shown in the figures and designed according to the invention, for example in the form of a BTV (“bottom top venting”) irritation projectile4(i.e., which has the blow-out direction upwards and downwards or in axially opposite directions), comprises an ignition device6of a design that is known per se. The ignition device6comprises a manually holdable or pressable and releasable rocker arm8, a pull-off securing ring (not shown), a spring10, a striking piece12and a primer cap14which are of a design that is already known, and which are therefore not described in more detail. A delay chamber16, which is designed in this case for example as a bore, extends axially below the primer cap14along a delay path18in which at least one delay charge20is arranged. In the case shown by way of example, the delay chamber16extends along an axial longitudinal direction24within, specifically centrally within, a housing inner body22which is shown by way of example as solid, and in so doing forms and thus delimits the delay path18. Effect chambers26which also extend in the axial longitudinal direction24and are arranged in the manner of a revolver and concentrically with respect to the delay chamber16are provided radially outside the delay chamber16, but only one of these corresponding to the sectional plane is shown inFIG.1. An effect charge28to be ignited is present in each of the effect chambers26, preferably in the form of a uniformly introduced particle material.

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.

A respective effect chamber26is connected to the centrally arranged delay chamber16via a respective over-ignition opening30. The over-ignition opening30is designed in this case as a bore. As intended, a combustion front of the delay charge20is meant to propagate along the delay path18in the axial longitudinal direction24starting from the ignition device6. When the combustion front reaches the first or a subsequent over-ignition opening30, for example branching off radially in this case, the effect charge28is intended to be ignited in the intended manner in the associated effect chamber26by igniting through this over-ignition opening30. In this case, inFIG.1, the effect charge which explodes by ignition is ejected, together with the intended effect associated therewith, upwards and downwards in the axial longitudinal direction24as intended.

At the same time, the combustion front also propagates axially in the delay chamber16until it reaches the next over-ignition opening30in the direction of the delay path18and, in the same way, as intended, causes an ignition of the effect charge28in the associated effect chamber26.

While the over-ignition opening30has since been left open, so that the ejected hot particles of the combustion front could propagate as unimpeded as possible through the over-ignition opening30into the associated effect chamber26and could lead to the ignition of the effect charge28provided therein, it is now proposed according to the invention that an over-ignition charge32is deliberately introduced into the over-ignition opening30, specifically at least along part of the extension of the over-ignition opening30or the over-ignition path34formed thereby (FIG.2), which is effective for the purposes to be illustrated below. The introduction of the over-ignition charge32into the over-ignition opening30makes it possible to also ensure that significantly more hot particles propagate through the over-ignition opening30towards the effect chamber26and lead to the reliable ignition of the effect charge28. Furthermore, a combustion residue36within the region38of the over-ignition opening30in which the ignition charge32is or was arranged is produced by the over-ignition charge32burning off. The combustion residue36therefore preferably comprises a not insubstantial portion of slag which can stop and become wedged within the over-ignition opening30. When the effect charge28is ignited, a considerable pressure shock is produced which propagates not only in the axial longitudinal direction24but also through the over-ignition opening30. This pressure shock results in a compression of the combustion residue36within the over-ignition opening30in a manner according to the invention. This means that the combustion residue36helps to reduce or dampen the effects and propagation of the pressure shock through the over-ignition opening30back towards the delay chamber16. 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.

As can be seen from the figures, the over-ignition opening30has a cross-sectional change40along the extension of the over-ignition path34, and the cross-sectional change40is preferably oriented such that the over-ignition opening30has, in the ignition propagation direction, i.e., towards the effect chamber26, an increasing cross-sectional area. InFIG.2, the cross-sectional change40is 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 body22from 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 change40can also be achieved by machining. In the case shown by way of example, access from radially outside is achieved through a further radial opening42in the housing inner body22, which is then closed by a blind rivet44. The housing inner body22receives, radially outside, a cylindrical sleeve body46which forms a manually grippable outer side48of the object2and, by way of example, securely seals the further radial openings42against environmental influences by means of two O-ring seals50.

If the over-ignition charge, as shown, is arranged in the region of the cross-sectional change40and is preferably immobilized there, the effect of the combustion residue36of the over-ignition charge32that reduces or damps the pressure shock is particularly effective. As a result of the pressure shock, the combustion residue36is, as also already shown at the outset, partially compressed, as a result of which the particles of the combustion residue36in the over-ignition opening30become wedged against each other and become an obstacle that is more difficult to overcome by pressure. As a result, the delay charge20located in the delay chamber16and 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 charges28.