IL213932A

IL213932A - Smoke grenade

Info

Publication number: IL213932A
Application number: IL213932A
Authority: IL
Inventors: Armin Weis; Bartholomaus Latour; Manfred Klare
Original assignee: Diehl Bgt Defence Gmbh & Co Kg; Armin Weis; Bartholomaus Latour; Manfred Klare
Priority date: 2010-07-09
Filing date: 2011-07-05
Publication date: 2013-08-29
Also published as: EP2405231A2; EP2405231A3; DE102010026641A1; IL213932A0; MY160482A; EP2405231B1; DK2405231T3

Description

)v» pa SMOKE GRENADE Pearl Cohen Zedek Latzer P-75073-IL BP 298 IL C /bu Diehl BGT Defence GmbH & Co. KG, Alte N Bdorfer StraBe 13, 88662 Pberlingen Smoke grenade The invention relates to a smoke grenade according to the precharacterizing clause of Claim 1.

Smoke grenades such as these are intended to form a smoke curtain in order in this way to protect vehicles or troops against discovery, detection and target tracking. Smoke grenades are normally carried in a plurality of launcher tubes on an armoured vehicle and are fired when required by firing a propellant charge, on a flight path which is defined by the angular setting of the launcher tube. After leaving the launcher tube, the pyrotechnic effect charge of the smoke grenade is broken up and initiated by initiation of the break-up charge.

WO 03/106913 Al discloses a smoke grenade which has a plurality of layers of smoke tablets, which are burnt via a pyrotechnic effect charge underneath. Because of the stack formation, this leads to the individual smoke tablets that have been fired to burn individually successively over. time along the ballistic flight path of the smoke grenade. However, the problem in this case is that only small smoke clouds are produced because the individual smoke tablets burn successively along the flight path of the smoke grenade. A further problem is that the smoke wall formed in this way has a comparatively low smoke density.

The present invention is based on the object of providing a novel smoke grenade in which the active smoke compound is distributed at a predetermined distance from the object to be protected directly and without being influenced by the incident air flow, to form a voluminous smoke wall with a high smoke density, in a simple manner after launching of the smoke grenade. According to the invention, this object is achieved by the features of Claim 1. Preferred refinements and developments of the smoke grenade according to the invention are described in the dependent claims .

The smoke grenade according to the invention has an active smoke compound for production of a concealment smoke, and a break-up charge for breaking up and initiating the active smoke compound. A delay charge is also provided, and results in the break-up charge becoming effective with a delay. The delay charge according to the invention makes it possible to start the mechanism for production of the concealment smoke immediately when the smoke grenade is launched, while at the same time delay the actual formation of the concealment smoke to a predefined time after leaving the launcher tube, such that the smoke is formed at an optimum time, and therefore at an optimum distance from ' the object to be protected.

In this case, the active smoke compound is preferably arranged around the break-up charge. This allows the active smoke compound to be deployed ' particularly effectively over a large volume when the break-up charge is initiated. The break-up charge is particularly preferably arranged in a longitudinal channel, which is located in the area of the longitudinal axis of the active smoke compound. This results in the active smoke compound being distributed largely radially symmetrically.

The delay charge is preferably also arranged in this longitudinal channel, to be precise adjacent to the break-up charge. This ensures that the delay charge, which is in contact with the break-up charge, can initiate the break-up charge after it has burnt.

According to one preferred embodiment of the present invention, an initiation element is arranged at that end of the delay charge which is opposite that end of the delay charge which faces the break-up charge, and said initiation element is designed to initiate the delay charge after the smoke grenade has been launched. In this case, it is particularly advantageous for the delay charge to comprise a charge with a deflagration effect. Specifically, if the delay charge is initiated at that end of the delay charge which is remote from the contact point between the delay charge and the break-up charge, the delay charge burns away with deflagration with a predetermined time constant in the direction of the contact point between the delay charge and the break-up charge. In particular, this has the advantage that the mechanism for smoke production can be initiated directly when the smoke grenade is launched, without any need for further measures subsequently, such as a signal for initiation of the break-up charge from the launch mechanism to the smoke grenade that has been fired, or a complex time fuze.

The break-up charge in the smoke grenade may comprise a pyrotechnic charge and/or a charge based on explosive. In this case a break-up charge based on explosive has the advantage that the active smoke compound is not only initiated very effectively, but the active smoke compound is also distributed very spontaneously and over a large volume, to be precise independently of the active smoke compound being distributed by the incident air on the smoke grenade. This spontaneity of the distribution of the active smoke compound can advantageously be further increased via the active smoke compound comprising a charge with a detonation effect .

In the case of the smoke grenade according to the invention, there are preferably no metal parts in the parts which are ejected, as a result of which no metal parts which could lead to injuries are deployed into the area of one's own troops when the smoke grenade is launched .

One exemplary embodiment of the smoke grenade according to the invention is illustrated in a longitudinally sectioned form in the attached drawing, and will be described in the following text.

The figure shows one embodiment of the smoke grenade 1 with an active smoke compound 2 for production of a concealment smoke, and with a break-up charge 3 for breaking-up and initiating the active smoke compound 2. The smoke grenade 1 has a delay charge 4, which results in the break-up charge 3 becoming effective with a delay.

The break-up charge 3 is arranged in a longitudinal channel, which is located in the area of the longitudinal axis of the active smoke compound 2. The active smoke compound 2 ' is arranged cylindrically around the break-up charge 3.

The delay charge 4. is arranged in the longitudinal channel, adjacent to the break-up charge 3. In this case, the delay charge 4 makes effective contact with the break-up charge 3 such that the break-up charge 3 is initiated when the delay charge 4 has burnt away to the contact point between the delay charge 4 and the break-up charge 3. This effective contact or effective coupling between the delay charge 4 and the break-up charge 3 preferably results from the heat developed when the delay charge 4 burns away.

An initiation element 5 is arranged at that end of the delay charge 4 which is opposite that end of the delay charge 4 which faces the break-up charge 3, and said initiation element 5 is designed to initiate the delay charge 4 after the smoke grenade 1 has been launched.

The delay time interval between launching of the smoke grenade 1 and initiation of the active smoke compound 2 - and therefore the distance of the concealment smoke from the object to be protected - can be predetermined in a defined manner by variation of the length of the delay charge 4 between the initiation element 5 and the contact point between the delay charge 4 and the break-up charge 3. For example, it is also feasible to achieve a variably adjustable delay time for a predetermined length of the delay charge 3 by arranging a plurality of initiation elements 5 over the length on the delay charge 4. If a shorter delay time is desired, then an initiation element 5 which is closer to the contact point between the delay charge 4 and the break-up charge 3 is simply initiated in order to initiate the delay charge 4. In this case, the respectively required initiation element 5 can be selected automatically within a fully automated, software-based, high-speed position estimate.

List of reference symbols Smoke grenade Active smoke compound Break-up charge Delay charge Initiation element

Claims

Patent Claims

1. Smoke grenade (1) having an active smoke compound (2) for production of a concealment smoke and having a break-up charge (3) for breaking up and firing the active smoke compound (2), character!zed in that a delay charge (4) is provided, which results in the break-up charge (3) becoming effective with a delay.

2. Smoke grenade (1) according to Claim 1, wherein the active smoke compound (2) is arranged around the break-up charge (3) .

3. Smoke grenade (1) according to Claim 2, wherein the break-up charge (3) is arranged in a longitudinal channel, which is located in the area of the longitudinal axis of the active smoke compound (2) .

4. Smoke grenade (1) according to Claim 3, wherein the delay charge (4) is arranged in the longitudinal channel, adjacent to the break-up charge (3).

5. Smoke grenade (1) according to Claim 4, wherein an initiation element (5) is arranged at that end of the delay charge (4) which is opposite that end of the delay -charge (4) which faces the break-up charge (3), and said initiation element (5) is designed to initiate the delay charge (4) after the smoke grenade (1) has been launched.

6. Smoke grenade (1) according to one of the preceding claims, wherein the delay charge (4) comprises a charge with a deflagration effect.

7. Smoke grenade (1) according to one of the preceding claims, wherein the break-up charge (3) comprises a pyrotechnic charge and/or a charge based on explosive.

8. Smoke grenade (1) according to one of the preceding claims, wherein the active smoke compound (2) comprises a charge with a detonation effect.

9. Smoke grenade according to any one of claims 1-8 as described in the specification.

10. Smoke grenade according to any one of claims 1-8 as illustrated in any of the drawings. P-75073-IL