EP0780658B1 - Hand grenade for generating smoke quickly - Google Patents

Abstract

Hand grenade comprises: (i) a manually movable igniter head (A) consisting of a piece (1) having a central hole (3) with an impact piece (5) hinged on one side of the piece via a spring (7) and an impact bolt (9) and with a securing handle (11) secured via a securing element (13) and hinged on the opposite side of the piece (1), the handle holding the piece (5) secure via spring (7); (ii) an active composition body (B) made of an aluminium can (15) having a reinforced base (17) connected to the piece (1) of the igniter head (A), a smoke agent (19) arranged in the can (15) with the formation of a channel (21) through the middle of the can in the form of a small composition with smoke active ingredient based on thin leaves (flares) coated with red phosphorus, and a closable lid (23) securing the can (15) to its top part; and (iii) ignition scanning unit (C) comprising a piece (25) connecting the head piece (1) of the igniter head (A) to the base (17) of the can (15) via screws (27,29), and a thin aluminium sleeve (31) fixed in a central hole (33) of the piece (25) and penetrates the channel (21) releasing the agent (19) practically to the bottom of the can (15) and in which is arranged a charge (35) to ignite the agent (19) and to decompose the can (15) by means of a central ignition helix (51). The pyrotechnic active chain of the contact piece (5) to the charge (35) is formed of an ignition cap (37) in the central holes (3,33) of the head piece (1) and the piece (25) to the ignition delay element (39). The handle (11) is connected via a 1st connecting element (41) to the head piece (1) of the igniter head (A). The lid (23) closing the can (15) is connected to the reinforced base (17) of the aluminium can (15).

Description

The invention relates to a new hand grenade in shape a quick fog grenade.

Hand grenades are military melee weapons and serve to fight hidden targets that are within range. Hand grenades usually consist of a shell, an explosive filling and a detonator. If necessary, the shell of the Hand grenade be designed so that it splinters heavily. In each In this case, the explosive charge is detonated by ignition.

It is also known for camouflage or confusion the enemy with the help of a smoke missile a cloud of fog to create. Fog missiles are in different embodiments known. For example, from DE-B 11 85 510 and DE-B 14 28 657 known smoke missile, whose in a throwing container located fog set via a contact head to the effect can be brought. From EP-A 0 046 230 is a smoke nozzle known, the mist set out in one with longitudinal target breaking points provided shell layered pressed bodies with a central There is a recess in which an ignition charge is arranged. For this purpose, the mist agent has to be granulated and compressed into compacts become. However, there is the disadvantage of such a molding compound in that the granules ignite immediately and then also reacts quickly, so that the fog effect does not last very long. In addition, the granules quickly fall to the ground, so that none longer standing cloud can be developed. With compacts can prolonged fog duration can be achieved, however such projectiles due to their mass, especially in the case of Disassembly of a smoke grenade represents a potential hazard.

From DE-A 28 11 016 there are finally throwing bodies with a electrically actuated contact head and an arranged thereon can-shaped waste container closed with a lid known to be shot down from a shooting cup to attract and deceive missiles by infrared radiation.

The previously known fog generating devices were all associated with disadvantages. Either became very toxic Compounds, for example white phosphorus, to produce the Used fog or the cloud of fog that formed did not last very long. Other smoke substances are only al Point mist used and have the disadvantage of a longer duration time to build up fog.

It was an object of the invention to generate a fog to develop the body in the form of a quick-fog hand grenade, in which the fog agent very quickly lasts for a long time Fog forms, which in addition to the visual range also in the infrared range Effect achieved, and its components less are more toxic than known smoke agents. At the same time from the heavier remaining when such a hand grenade is disassembled Components no risk of injury to those who operate this grenade Thrower going out. The same applies to the smoke.

(I) einem manuell betätigbaren Zünderkopf aus einem eine zentrale Bohrung aufweisenden Kopfstück mit einem an der einen Seite des Kopfstücks schwenkbar angeordneten, über eine Spannfeder betätigbaren und einen Schlagbolzen aufweisenden Schlagstück und mit einem an der gegenüberliegenden anderen Seite des Kopfstücks schwenkbar angeordneten und über ein Sicherungselement gesicherten Sicherungsbügel, der in gesichertem Zustand das Schlagstück über dessen Feder gespannt hält,

(II) einem Wirkmassenkörper aus einer gezogenen Aluminiumdose mit einem dem Kopfstück des Zünderkopfes zugeordneten und verstärkt ausgebildeten Boden, einem in der Aluminiumdose unter Bildung eines das Doseninnere mittig durchsetzenden Kanals angeordneten Nebelmittel in Form von mit Nebelwirkstoff auf Basis von mit rotem Phosphor beschichteten brennbaren scheibenförmigen oder scheibensektorförmigen dünnen Blättchen (Flares) geringer Masse und mit einem die Aluminiumdose an ihrem ursprünglich offenen Ende verschließenden Deckel, sowie

(III) einer Anzündzerlegereinheit aus einem das Kopfstück des Zünderkopfes mit dem Boden der Aluminiumdose des Wirkmassenkörpers jeweils über Schraubgewinde verbindenden Einsatzstück und aus einer in einer zentralen Bohrung des Einsatzstücks fixierten gezogenen dünnwandigen Aluminiumhülse, die den vom Nebelmittel freigelassenen Kanal nahe zu bis zum Boden der Aluminiumdose durchsetzt und in der eine Anzündzerlegerladung zur Anzündung des Nebelmittels und zur Zerlegung der Aluminiumdos mittels einer gegebenenfalls vorhandenen zentralen Anzündseele angeordnet ist,

dadurch gekennzeichnet, daß

(a) die pyrotechnische Wirkkette vom Schlagstück zur Anzündzerlegerladung von einem in den zentralen Bohrungen des Kopfstücks und des Einsatzstücks angeordneten Anzündhütchen mit nachfolgendem Anzündverzögerungselement gebildet wird,

(b) der Nebelwirkstoff aus etwa 70 Gewichtsprozent bis 80 Gewichtsprozent pyrotechnischer Masse umfassend roten Phosphor und aus etwa 20 Gewichtsprozent bis 30 Gewichtsprozent Bindemittel besteht,

(c) die Anzündzerlegerladung als aktiven Inhaltsstoff Aluminium und Kaliumperchlorat enthält,

(d) der Sicherungsbügel über ein erstes Verbindungselement in Form eines Stahlseils, Stahldrahts oder Stahlbügels mit dem Kopfstück des Zünderkopfes verbunden ist und

(e) der die Aluminiumdose verschließende Deckel über ein zweites Verbindungselement in Form eines Stahlseils, Stahldrahts oder Stahlbügels mit dem verstärkten Boden der Aluminiumdose verbunden ist.

According to the invention, this object is achieved by a rapid-fog hand grenade

(I) a manually operable detonator head consisting of a head piece having a central bore with a striking piece which can be pivoted on one side of the head piece, can be actuated via a tension spring and has a firing pin, and with a striking piece which is pivotably arranged on the opposite other side of the head piece and has a securing element secured safety bracket that, when secured, holds the striking piece over its spring,

(II) an active mass body made of a drawn aluminum can with a base which is assigned to the head piece of the detonator head and has a strengthened design, a fog agent arranged in the aluminum can with the formation of a channel penetrating the inside of the can in the form of flammable disc-shaped or coated with fog active substance based on red phosphorus disc-shaped thin sheets (flares) of low mass and with a lid which closes the aluminum can at its originally open end, and

(III) an ignition disassembly unit consisting of an insert piece connecting the head piece of the detonator head to the bottom of the aluminum can of the active mass body via screw thread, and of a thin-walled aluminum sleeve fixed in a central bore of the insert piece, which connects the channel released by the fog agent to almost the bottom of the aluminum can interspersed and in which an ignition disassembly charge for igniting the fog agent and for dismantling the aluminum doses is arranged by means of a central ignition core which may be present,

characterized in that

(a) the pyrotechnic active chain from the impact piece to the ignition disassembly charge is formed by an ignition cap arranged in the central bores of the head piece and the insert piece, with a subsequent ignition delay element,

(b) the mist agent consists of about 70 percent by weight to 80 percent by weight of pyrotechnic composition comprising red phosphorus and from about 20 percent by weight to 30 percent by weight of binder,

(c) the igniter charge contains aluminum and potassium perchlorate as the active ingredient,

(d) the securing bracket is connected to the head piece of the ignition head via a first connecting element in the form of a steel cable, steel wire or steel bracket and

(e) the lid closing the aluminum can is connected to the reinforced base of the aluminum can via a second connecting element in the form of a steel cable, steel wire or steel bracket.

With the rapid fog hand grenade according to the invention a very stable cloud of fog can be built up in no time, which either serves to camouflage or confuse the opponent. With the rapid fog grenade according to the invention it is possible to a cloud of fog with a diameter of up to 10 m inside build up from 1 to 2 seconds, which then in up to 2 minutes stops in the air. The ingredients and the resultant Mists are not toxic to the environment. The burnables are at most slightly toxic, so that only a small load on the Environment is achieved. In addition, the individual are massive Parts of the rapid fog hand grenade connected so that the thrower cannot be injured by it. The distributed fog particles in turn are so light that their storage is in the vicinity of a maximum of 10 m around the cutting point and thereby there is no danger to the thrower.

In the present active mass body instead of one Aluminum can, preferably a drawn aluminum can, too a can made of another common metal, such as sheet metal, or also be used from a suitable plastic, wherein here especially for environmental reasons, especially degradable Plastics are used.

The detonator head of the rapid fog grenade according to the invention is constructed in a manner known per se, whereby be Safety bracket is characterized above all by the fact that it by his special shape and in particular its elongated ironing fork unintentional release from the securing element arranged on the head piece prevented. An undesirable separation will continue the safety bracket after actuation of the detonator head and thus a danger for the thrower according to the invention prevents the safety bracket from a connecting element is securely connected to the head of the detonator head, why this connecting element preferably from one to the Steel cable, steel wire, each securely fixed to the parts to be connected or steel bracket. The head of the detonator head can be made of any common material. It consists in particular of aluminum and is preferably by Die cast manufactured. That in the central hole of the head piece arranged primer is a common component in technology, whose active component when the impact piece hits the firing pin disposed thereon is initiated in a manner that for the immediate ignition of the related and the ignition delay element arranged in the insert of the ignition disassembly unit leads. This hit is included of its individual elements also in a manner known per se built up.

The preferred aluminum can of the active mass body is preferably produced by deep drawing, extrusion or die casting. This enables easy manufacture of a compact one and with a reinforced bottom box that is both made of For reasons of strength as well as for safe arrangement and assembly the one to be anchored in or around the ground further components of the rapid fog hand grenade according to the invention is needed. The aluminum can is arranged according to the ignition disassembly unit in the central hole of their reinforced bottom, which is preferably done via a screw thread, from their open Floor provided with the elements to be arranged in it. This includes, among other things, the preferably existing one on the floor supported by a spring, in particular a snap ring, loaded shim. Furthermore, this preferably belongs also existing connecting element, if this is in Annular gap between the thin-walled aluminum sleeve of the ignition disassembly unit and the smoke agent around them to be arranged inside the aluminum can. Of course, this connection element can be used in such a case first be fixed to the bottom of the aluminum can. This is where in the form of flammable disk-shaped or disk-sector-shaped thin leaves (flares) of low mass placed in the aluminum can. After filling the This becomes an aluminum can with the flares that form the fog agent Can tightly closed with a lid, what to use usual measures can be taken and preferably by Placement of an adhesive between the inner jacket of the lid and the associated outer jacket of the aluminum can. After arranging the lid on the aluminum box, the bottom of the Lid also in a preferred embodiment in Annular gap existing connecting element using measures be attached, which ensures a secure connection of the reinforced Bottom of the aluminum can with its lid.

This connecting element can for example consist of a there are securely fixed steel cables, steel wire or steel brackets, preferably ensured by a certain excess length is that this element before laboratoryizing the active mass body can already be firmly attached to the lid before closing it is put on. Instead, such a connecting element also be a so-called sieve tube, as it is used for firmly connecting the bottom of such cans to the respective one Cover is common in itself. For this purpose, the respective sleeve Ignition disassembly unit around, namely in a released Canal, simply a sieve tube (for the easy passage of the Combustion gases) arranged and in a suitable manner, as by Screw together, fixed to the parts to be connected.

The in a preferred embodiment between the reinforced bottom and the adjacent top layer of the Mist means also existing arrangement of one with one Spring, preferably a snap ring, loaded shim serves to compensate dimensional tolerances and above all this means that the fog agent in the form of a compact body is fixed in the aluminum can.

In a preferred embodiment, the aluminum can radial or of the active mass body in its jacket better longitudinal breaking points, which are expediently arranged in the jacket of the aluminum can Longitudinal grooves are the same in the manufacture of the aluminum can can be impressed. Through these predetermined breaking points disassembling the aluminum can is easier and at the same time one clean all-round distribution of what is in the aluminum can Fog agent with the result that the desired large area and clean cloud of fog is formed, which is proportionate stays in suspension for a long time and from the burning smoke is replenished.

As a carrier for the thin ones that form the fog Papers are suitable for a wide variety of plastics as well as uncoated or coated paper. The latter is preferred because the former usually always contains some water, so that a premature reaction with which the base of the smoke agent representing red phosphorus. The on the carrier applied pyrotechnic active mass contains to generate the The main active ingredient is red phosphorus. It preferably exists comprising from about 70 wt .-% to 80 wt .-% pyrotechnic mass red phosphorus and from about 20% by weight to 30% by weight of a binder, which is preferably a pasty polyvinyl chloride. This pyrotechnic mass can also have other usual additives contain, for example, a share of magnesium to prevent fog accelerate further.

The combustible, disc-shaped, smoke-forming agent or disk-sector-shaped thin leaflets (circular segment particles, which may be connected to one another via webs and thus represent disk-shaped particles) correspond in their outer circumference approximately the inner diameter of the aluminum can and in its inner circumference about that in the central channel formed to be used thin-walled aluminum sleeve of the ignition disassembly unit. However, one is preferably proportional narrow annular groove or at least a small channel, where that preferably between the bottom of the aluminum can and its lid arranged connecting element can be accommodated. The special form of the fog agent has the advantage that the Fog agent in a very economical and tightly packed manner in the Can arrange aluminum can, these leaves according to their Ignite relatively slowly from the edge towards the center. hereby the leaves remain in the air for a relatively long time float and hold their fog-forming effect - in contrast to the Burning off granular smoke agent - even for a relatively long time on. Of course, the carrier of the fog agent can be one-sided or preferably coated on both sides with fog agent.

The third essential component of the rapid fog hand grenade according to the invention is an ignition disassembly unit, the insert of which is preferably arranged tightly and tightly in the central bore of the reinforced base of the aluminum can via a screw thread. The head part of this insert piece is firmly connected to the head piece of the igniter head by means of suitable means, preferably in turn a screw thread, the individual components also being gas-tightly sealed off from one another if necessary. A thin-walled aluminum sleeve which extends practically through the entire active mass body is arranged in the central bore of the insert. The insert of the ignition disassembly unit can in turn consist of any material that is customary for this purpose and is preferably made of aluminum. In the thin-walled aluminum sleeve of the ignition disassembly unit, an ignition disassembly charge is contained, the active ingredient of which is a classic pop set based on aluminum potassium perchlorate (Al / KClO ₄ ), since such a set is far less toxic than a set based on magnesium and barium nitrate (Mg / Ba (NO ₃ ) ₂ ). The knitting chain and thus the ignition path from the ignition cap arranged in the head piece of the ignition head to the ignition disassembly charge in the thin-walled aluminum sleeve is formed via an ignition delay element arranged in the central bore of the insert of the ignition disassembly unit. As a result of its predefined delay, this ensures that the rapid fog hand grenade according to the invention, once mechanical initiation has taken place, can only develop its effect after a desired time, and thus also throwing distance, with the aluminum can being dismantled and the ignition and discharge of the fog agent. At the same time, the ignition delay element allows the launcher a certain time to drop the grenade and, if necessary, to be able to get to safety. An ignition core is preferably also arranged in the latter for faster ignition and better through-reaction of the ignition disassembly charge present in the aluminum sleeve. Instead of this, particles of more active material can optionally also be statistically distributed in the ignition splitter charge, which, if necessary, in turn ensures rapid ignition and reaction of the actual ignition splitter charge. The predetermined time within which the ignition delay element reacts and then ignites the igniter charge is only a few seconds and can be, for example, in the range from 3 to 8 seconds.

The use of aluminum as a building material for the essential components of the rapid fog hand grenade according to the invention brings in addition to the advantage of easier manufacture such objects have the further benefit that this Material about the corrosion resistance desired in such devices and compatibility with most pyrotechnic Sets, so that then on a special corrosion protection can be dispensed with. In addition, in such a case too the particles formed during the decomposition are so light that they do not fly far and cannot cause injury.

Before throwing, the rapid fog grenade according to the invention with the throwing hand so that the safety bar is held. With the other hand, the securing element unlocked. Then the safety bar is only from the throwing hand recorded. If the grenade is thrown now, then it can the safety bracket from the striker under spring pressure pushed away and so its firing pin on that in the head of the Hit the primer cap and thereby the Initiate the charge in it and then the entire charge Get the knitting chain going. After the specified delay time becomes the ignition splitter charge present in the ignition splitter unit lit, the thin-walled aluminum sleeve disassembled and this set the surrounding smoke agent on fire. At the same time, the mantle of the resulting pressure Disassembled aluminum can, and the burning fog-forming leaves are forming a clean and floating cloud in the Environment ejected. Here the grenade launcher is in front all protected from mechanical injury that the more massive particles of the rapid fog hand grenade according to the invention connected by appropriate security elements and not can fly apart.

The invention will now be described with reference to a single figure explained, the longitudinal section through an inventive Rapid smoke hand grenade can be found.

In detail, the figure shows a detonator head A, can be operated manually by means of a safety bracket 11. The securing bracket 11 is with a securing element 13 on the head piece 1 of the fuse head A attached. Furthermore, on the head piece 1 and approximately in a fuse element 13 opposite by means of the tension spring 7 and its fastening pivotable arrangement an impact piece 5 having a firing pin 9 is attached, in the secured state from the safety bracket 11 under Spring pressure is kept. The head piece 1 has a central one Bore 3 on, in the striker 5 associated upper end a primer 37 is arranged, which is a usual and by Includes initiation charge that can be initiated. The safety bracket 11 is via a connecting element 41 (in the present case a Steel wire) firmly connected to the head piece 1 of the igniter head, to separate and fly away in this way of the safety bracket 11 from the headpiece after throwing and Prevent the reaction of the present rapid fog hand grenade. A screw thread 27 is also arranged in the head piece 1 that the detonator head with an ignition disassembly unit C and over the latter can also be firmly connected to an active mass body B. can.

The figure further shows an active mass body B with initially a drawn aluminum can 15. In the preferably a central bore having a screw thread 29 the reinforced bottom 17 of this box is the later in individual ignition disassembly unit C to be described gas-tight arranged in closing. Inside the aluminum can 15 is immediate in the area of their reinforced bottom 17 a one preferred embodiment corresponding shim 47 arranged via a spring 49, which is shown in the Shape is a snap ring that is pressurized.

In the central bore of the insert 25 of the ignition disassembly unit C is also gas-tight the thin-walled aluminum sleeve 31 is arranged. The thin-walled Aluminum sleeve 31 extends axially practically through the entire Aluminum box 15 and is in total with an ignition disassembly charge 35 filled, which in the preferred embodiment on a classic pop set made of aluminum and potassium perchlorate, especially since this is much less toxic than the others Usually used ignition disassembly sets based on a Mixture of magnesium and barium nitrate based, which is considered toxic is classified. In the central bore 33 of the insert 25 of the ignition disassembly unit C is the ignition delay element 39 arranged, the effective mass of the desired delay results in, for example, a standard delay of 3.5 ± 0.5 Seconds. The aluminum can 15 is forming a channel 21 or just a recess for guiding a connecting element 43 overall coated with the fog agent 19 in the form flammable disc-shaped and in the preferred embodiment disk-shaped leaflets (flares) filled. These are in the preferred embodiment with a fog agent on both sides are coated on the basis of red phosphorus, these Coating preferably from about 70 wt .-% to 80 wt .-% pyrotechnic Mass comprising red phosphorus and about 20 wt .-% to 30 wt .-% binder.

The aluminum can 15 of the active mass body B is on its originally open end firmly connected to a cover 23, this fixed connection in the preferred embodiment via a not shown and between the inner jacket of the Cover 23 and the associated part of the aluminum can 15 arranged Adhesive exists. The reinforced bottom 17 of the aluminum can 15 is fixed to the cover 23 via a connecting element 43 connected, which is in the shown and preferred embodiment is a steel wire, which in one of the Channel 21 free ring groove between the thin-walled aluminum sleeve 31 and the fog agent 19 or as an alternative only one of the recessed longitudinal notches is guided. The of the Spring 49 acted shim 47 serves, moreover, as already mentioned, to compensate for dimensional tolerances, a possible remaining volume and to hold together practically of the combustible disk-shaped forming the fog agent 19 or disc-shaped thin leaflets (flares).

The operation of the rapid fog hand grenade according to the invention is known per se to the person skilled in the art and has already been briefly described. It is therefore unnecessary to elaborate on this enter into. Of course, the invention is not limited to that limited particular embodiments mentioned, but should also on modifications within the scope of the professional skill extend, provided that of the essential elements the invention is used.

LIST OF REFERENCE NUMBERS

A =

igniter head

B =

Active mass body

C =

Anzündzerlegereinheit

1 =

headpiece

3 =

central hole (in head piece 1)

5 =

firing pin

7 =

tension spring

9 =

firing pin

11 =

safety catch

13 =

fuse element

15 =

aluminum can

17 =

reinforced bottom (of aluminum can 15)

19 =

fog agents

21 =

channel

23 =

cover

25 =

insert

27 =

Screw thread (on head piece 1)

29 =

Screw thread (on insert 25)

31 =

thin-walled aluminum sleeve

33 =

central bore (in insert 25)

35 =

igniter-

37 =

Primer

39 =

Anzündverzögerungselement

41 =

first connecting element (at the igniter head A)

43 =

= second connecting element (on active mass body B)

47 =

shim

49 =

feather

51 =

ignition core

Claims (5)

1. Hand grenade for generating smoke quickly with

   (I) a manually actuated fuse head (A) consisting of a head piece (1) comprising a central aperture (3) with a striking member (5) which is pivotally arranged on the one side of the head piece (1), can be actuated by a tension spring (7) and comprises a striking pin (9), and with a safety clip (11) pivotally arranged on the opposing other side of the head piece (1) and secured by a securing element (13), which safety clip (11) holds the striking member (5) via the spring (7) thereof in the secured state ,

   (II) an active mass element (B) consisting of a drawn aluminium box (15) with a reinforced base (17) associated with the head piece (1) of the fuse head (A), a smoke means (19) in the form of combustible disc-shaped or disc sector-shaped thin flares of low weight coated with active smoke substance based on red phosphorus, arranged in the aluminium box (15) simultaneously forming a duct (21) penetrating the interior of the box centrally, and with a cover (23) sealing the aluminium box (15) at its originally open end, and

   (III) an igniter-dismantling unit (C) consisting of an insert (25) connecting the head piece (1) of the fuse head (A) to the base (17) of the aluminium box (15) of the active mass element (B) via screw threads (27, 29) respectively and of a drawn thin-walled aluminium sleeve (31) fixed in a central aperture (33) of the insert (25), which aluminium sleeve (31) penetrates the duct (21) left open by the smoke means (19) virtually to the base (17) of the aluminium box (15) and in which an igniter-dismantling charge (35) for igniting the smoke means (19) and for dismantling the aluminium box (15) by means of an optionally present central igniter core (51) is arranged,

      characterised in that

   (a) the pyrotechnic active chain from the striking member (5) to the igniter-dismantling charge (35) is formed by an igniter cap (37) with adjoining igniter delay element (39) arranged in the central apertures (3, 33) of the head piece (1) and the insert (25),

   (b) the active smoke substance consists of approximately 70 wt.% to 80 wt.% pyrotechnic mass comprising red phosphorus and of approximately 20 wt.% to 30 wt.% binder,

   (c) the igniter-dismantling charge (35) contains aluminium and potassium perchlorate as active ingredient,

   (d) the safety clip (11) is connected to the head piece (1) of the fuse head (A) by a first connecting element (41) in the form of a steel cable, steel wire or steel clip and

   (e) the cover (23) sealing the aluminium box (15) is connected to the reinforced base (17) of the aluminium box (15) by a second connecting element (43) in the form of a steel cable, steel wire or steel clip.
2. Hand grenade for generating smoke quickly according to claim 1, characterised in that the second connecting element (43) is a coaxial perforated tube connected to the cover (23) and the base (17) of the aluminium box (15).
3. Hand grenade for generating smoke quickly according to claim 1 or 2, characterised in that the second connecting element (43) is arranged so as to extend in the annular gap formed by the duct (21) between the thin-walled aluminium sleeve (31) and the smoke means (19).
4. Hand grenade for generating smoke quickly according to any one of the preceding claims, characterised in that the aluminium box (15) of the active mass element (B) has predetermined breaking points extending radially or preferably longitudinally in its casing.
5. Hand grenade for generating smoke quickly according to claim 4, characterised in that the predetermined breaking points present in the aluminium box (15) are arranged in the casing thereof in the form of longitudinal grooves.

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