IT8149471A1 - Structure of a gas-generating propellant cartridge or pyrotechnic device and its ignition method - Google Patents

Description

DESCRIPTION

-ja accompanying an application for a patent for an invention

idal -title:. .. _. _ _ _

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1 4

4 "Structure^ of... cartridge or .pyrotechnic .propellant .

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4. gas generator and related method of ignition " <

I * . in .name ..of:. AKTIEBOLAGETBOPOHS _ _ __ ? O z a o ? : O < ac.

1 z __.i_ < _ SUMMARY. ivi <t ci > - o _ The invention. refers. to_ a .method of . ?O

2- ? O CH

3 4 ignition... of. a -Propellant cartridge, generating ?

03 _ ! _ j gas. loaded., with _propeller__powder_ formed_ by_ parts ? g

\ -_ _ j_c_e Ile.. with._the.aid._of_a.tube.for..the.powder.and.displace- _ _ i _ j_st.o...in?the.lateral.direction.of.the.powder.charge- _

i I

_ _ |_v e r e p ro p e 11 ent eh e __ s i . ac c. end e__ lun go ._ its ..super .r- _ _ _ _ Lf loie .internal, of ..mantle., _. so.do_.that when. _scop-.

__l.pia-in.. following the _ its own, ^internal pressure, au?

_ Lmentata_causes _an_instantaneous_ignition_ _ The length is the entire length of the propellant charge. _ l o

_ _ The _ _ Meli ' invention ?_also_ included .a_ propellant_ cartridge_ constructed according to the _4.de method if

-This invention relates to a method of igniting a gas-generating propellant cartridge containing a propellant powder.

?made of loosely packed particles. Cartridges ?? . . ? - ? j

[ ce a propellant of the type primarily intended !

. . .

< l in this regard, explosive grenades, illuminating grenades and ammunition are normally used in gra- I Q, ? | vi < j

O Ui ? < | smoke grenade for use with mortar launchers. ' Similar propellant cartridges generally

j <

^ <! include a cartridge made of cardboard or \ _ co |

? or other material^which, when the_charge ignites there?- Z -o <N o ? . . ~ . . . ' . f-4

oc ine easily exploded by the increase in pressure <

ra . yes ? ' " " . .

1 01 internal iasion_ caused by the burning of the powder- c | ~ . . . j '

j re propel .lente unless the cartridge is sup- j

i

[reach ^iil _its_ external side. Therefore, normally the _

propellant cartridge is placed in a special |

tube that is perforated by a number of openings!

[lateral and which constitutes the posterior extremity

[of the grenade that must be parried. When the propellant cartridge is fired, the [

[cardboard bursts at the perforations and the escaping powder gases drive the grenade out of the barrel.

?The ignition of the powder normally occurs by means of a detonator positioned at the bottom of the cartridge.

;a propellant that is forced against a firing pin positioned at the bottom of the barrel intended !

[for the grenade in question.

The general structure of the cartridge pro-

i \

successfully for many years. Previously, of rei

;throat the ignition of the propellant charge has occurred

1 - .

l by means of an igniter that ignites a charge ? or ?-+ ? primer capsule which in turn ignites the propellant powder charge. In order to obtain a central ignition of the propellant powder charge??

, ( J < te previously ? was placed above the ca-f- *7

? "tv - -j u ?- -:the primer was a hollow metal tube. This tube extended approximately halfway up the height of the charge. The flame coming from the 'O

< Ni ;primer charge in this way was guided to-CQ

?so the center of the propellant powder charge and -etal

A central ignition was obtained. Does it burn?

.i...ture of the propellant powder widened - therefore;

! from the center of the charge toward its ends. This ignition system was considered to be of a satisfactory type. A switch to larger propellant charges and more modern types of powder would be necessary to obtain

; among other things longer ranges, in the meantime

it has created certain problems. As a result, it has been

: it is established that these older ignition systems can cause, in very cold conditions, a

: back pressure in the propellant cartridge first

f e

.that it is perforated which, in combination with more modern and more powerful propellant charges, can do

so that the propellant tube explodes. _ _ I

This invention refers to a process?-I

completely new way of turning on a car?.

THE

gas-generating propellant, which consists of a propellant powder in the form of particles packed together in a loose manner. Also included in the invention is a device suitable for the method as described in the invention, which is also described as a gas-generating propellant cartridge for use with

00 I _ naz . _io _ni _ p .e. _r _ d _ i spo . . s _it _i _vi _ di _ l _ _an _cio _ a mor _t _ai _o _ . s.o. _tto : ,_j ! Here [ form of explosive grenades, illuminating grenades and

smoke grenades. In general, the invention should

be applicable for any type of cartridge j

gas-generating propellant using propellant powder made up of particles packed together in a way

j loose and also those types that have cartridges of i

' 7 ? . . ,

j steel so constructed as to withstand pressure

" ? . ? j

The internal increased formed when the powder propel- j

j lens burns. According to the invention, a tube of poi- !

. . " . ?

j^vere propellant is placed laterally above

j t

? of the propellant powder charge. One end 1

[of the powder tube? is connected to the igniter or j

? ?

t cartridge ignition composition a pr?- j

? pellente . ? I

The transmission of ignition to the propellant powder occurs by means of the igniter which can

i be reinforced with a reinforcing composition, ?

which lights the inner mantle of the powder tube? ' ? ' ? ' . "" " ? ? :

' re , _ and when the pressure from the powder gases for-_ internal combustion is greater than the resistance? ' . " ' ?rtg? i steer of the remainder of the powder tube it is . rrx_ _. Ine blown into pieces, whereupon the powder pro-a- <

O o - 5 surrounding pellet is ignited instantaneously ? O e? y. along the entire length of the propellant cartridge. In this way a radial ignition is obtained which, when it occurs instantaneously along the entire length of the propellant cartridge does not produce any harmful back pressure.

The invention is defined in the patent claims and is further described using the accompanying figures as an explanatory element. Figure 1 shows a side section schematic of a finned illuminating grenade while Figure 2 shows a side section through a propellant charge as described in the invention intended for a blasting grenade, an illuminating grenade or a smoke grenade, for use with a

! of mortar launching device.

The illuminated winged grenade shown' t

in the figure, 1 consists of a body 2 of the grenade >

' ' ' ?

which contains in active payload that in this ]

case? consists of an illuminating charge 3 with

parachute j4__e fuse _5. _ ?_

^ ? _ _At_the_rear_end_of_the_grenade _

there is a tube 6 of propellant cartridge inside which is positioned the propellant cartridge _^ 17. This in turn consists of a cartridge of J

-?o< . i r???~ cardboard 8 which contains a propellant charge 9. j Z -r>i< At the rear end of the cardboard cartridge I _?a > ?y 0^ is placed an impact detonator 10. The tube 6 of the propellant cartridge is provided with gas outlet openings 11 j i1m on which the cardboard cartridge c>

ne 8 bursts following the increase in pressure ini

three that occurs when the propellant powder is

lit, and a bottom opening 12 through which Ile

the ejection tube striker can reach j

the impact detonator 10 of the grenade in question

- In -figure 2 is shown a more detailed cross-section of the I-te 7 propellant cartridge. From the figure it can be seen that the cartridge

of cardboard 8? sealed at the bottom by a cartridge 10a with a reinforced brass bottom, on which ?.

jfused the impact detonator 10. The j detonator

^impact 10 can be reinforced for example with a

! compressed black powder tablet to ensure a ? . . " . . - - - - . " ' ? ? rapid ignition of the inside of the powder tube. The other end of the cardboard cartridge ? !

1 sealed with a brass cover or capsu-! a. : the end cap? 13- A powder tube 14 is cast onto the impact igniter 10. The powder tube 14 extends from the impact igniter to the inside of the end cap? 13. What is the

( j state of this, special coverage is not necessary

; to keep the inside of the powder tube free from the surrounding propellant powder 9 formed < co ?? I from loosely packed particles. The tube |

! of the powder can also be terminated exactly below the upper end surface

| of the charge, provided that the upper end

! of the dust tube is equipped with its own

(top seal closure that will keep the inside

! of the tube free of loose propellant powder. With this in mind, the powder tube must not be made so short that instantaneous axial ignition along the entire length of the propellant powder cannot occur when the powder tube bursts due to the increase in internal pressure caused by the powder gases;

; developed internally to the powder tube.

CLAIMS!

<

T

1. Method of igniting a cartridge i

j

gas-generating propellant loaded with powder |

loosely packed propellant, characterized by the fact that the propellant powder ignites < O ^ instantaneously along the entire length of the car-i az CT

Q ca through a propellant powder tube acc- cj <. ! 2 coupled axially with respect to the charge which is I < fsi "<?? ignited internally by a detonator cast on the tube ?

of the powder or on the igniter charge. ? m _ _ 2 . Igniter arrangement for the instantaneous ignition of a propellant charge g Ie-_

! !

pertaining to gases with stents. d i _ p o.lve re _ p rop.? 1 le nt e . amma s~ __

| [sata__in_a_loose manner according to the ..claim , _c a- _

ira 11 and raised by the ..?act_that _a ; type. of the _po Iver and P ro-

p e llent e with one end fused on a charge. of _j

t ?

ignition or detonator, ? arranged axially in-?j ? " j

ftemo of the propellant charge piled up loosely

to .

-- l?

2>._ Ignition arrangement according to the

claim 2 characterized by the fact that the tu-?

! j

bo of the propellant powder extends from one end; . ' ' ' i

mit? of the charge where it is fused on the ignition charge

i . . ? I

yes one or on the detonator, up to its other extremity

. t? where it extends upwards to the closure, to tet

>top charge that keeps the powder loosely packed around the powder tube separate from the inside of the powder tube.

4. Arrangement according to the claim

d.

3 characterized by the fact that the powder tube?/? [ consists of a double-based powder with a base of Q i, ' i unreinforced cellulose nitrate. c

?v ^ you were --5.? -Cartridge - proprietary. .dwarf gene. ga s .

N-wha? o _ _J_pe r. mmltion. For? of married people of ...mortar launches. CQ^ | . ZL - or _Lme?-granates_ espio si v.e.,?illuminating grenades or l grenades. . ! * o4ct ? ^smoke bombs . or . _yes I am there according to any opinion? of the _ri.VLe.ndica-_.... I .?? -4-tions.- from? including.? a -.cartridge _pr.ot.et.ti-_va-C il indric a r e al i z zata.j da_c.art one__o _mate r ial.e_.si , ; mile_ .who? sa?a._t enut_a. __su_.ent r.amb e_le _ e s t r emi t ?e_ri em-___i__pita-of a _powder r.e_p rop ellent e. formed, by cellular parts ?Lamina ssat?., in . easy way _what_, __when?.the_c artuc c ia _

_L is ... fired, . _ and. spio d . following the increase in internal pressure created by the combustion of the powder? _properly 11 e nt. _ on . those _ points _ where the __cartridge does not _

!_ other jnent i_ _reinforced, _ and on which a j _fixing element, for a detonator or igniter charge

i . . .

' ? positioned in one of the extreme-tight closures! ' " ' ? ' "" ' ' . ? ?

' mit? of the cartridge, characterized by the fact that

I

jun double-base propellant_pplvere_tube with [_

Unreinforced nitrocellulose base? Arranged as- i _ _

Q. tsj statically through the propellant cartridge from ? _ _

?,one of its_closures.a seal at the ends?^^.where ".e j i _ _ ? g? ? < ?T . . ~ 1 O ^ The inside of the powder tube is connected to the deto- Q O .OL^ O < u B? Z -jnator or ignition charge near its N.

- |N1 CO' ci? f another end-sealing closure?. _aQ - o

: Rome, 1 2 OCT.198)

aISsI < p . : AKTIEBOLAOET BOEORS tD

p.: INO. BARZANO ? & ZANARDO ROMA S.p._A_.

UT ! BA/cog/7516

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49471 A/81

Patent Office of the Kingdom of Sweden

Applicant;

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AB BOFORS, BOFORS, Sweden

O C

! Patent Application No. : * ? ?\

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1

| 800720 5-1 LO

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| Date of "patent" application:

: 15-10-1980

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International Class I:

_ , _ F 42 B n/22. F 42 B 9/14

1 1

? Title of the invention: !

"Method of igniting a 1 cartridge

: ; i

. -Gas generating drone and the construction of such a

; cartridge"

1

It is hereby certified that the documents-1

1

; the attachments are certified copies of the description j

' of the claims and of the signs originally

filed with the Swedish Patent Office in

1 i

, day reported on the documents.

| Ex offi cio i

F. to: 1

1 ? ? .. .

II

; Ingela Söderlund

1

' B. Simoncioni

1

Service charge: 25 Crowns:- :

Houses 2600

October 15, 1980

Applicant: AB B0F0RS , B0F0RS

Attorney: Bengt Falk

Inventors: Christer Elmqvist, Lars-Gunnar Svensson,

Ingmar Johansson

?f-T ? title -of-the-inventionT^IM&to -of -ignition of? a ; ? - -} gas-generating propellant cartridge and the construction of ? a? such- cartridges iaJ SUMMARY

The invention relates to a method of ignition of a propellant-generating cartridge.

I

4th gas loaded with _powder .propellant _formed by parti- __ I

_Lcelle. .with.JL ' ausi li.o... d_i._a_ tube.. for the dust of spo- _

l . 1

?..I'm..in the lateral direction..of? the caries of the, powder__propellant_ which.. ignites__along__.its . surface? ; _

_j_.fi ci e. ..internal, of._man.t ello. , . so that .. when, _s.cp.p- _

. 1

_hypia .following. its_ own_ increased_ internal_ pressure _ causes_ sudden_ radial_ ignition

; long .1 _'.i.nt e r a _ length of the propellant charge .

The 1st invention also includes a propellant cartridge, constructed in accordance with the method described.

I

This invention relates to a method of igniting a gas-propellant cartridge.

1 i

' blackening. gas containing a propellant powder filled with loosely packed particles. Propellant cartridges of the type primarily intended for this purpose are normally used in large quantities.

explosive grenades, illuminating grenades and smoke grenade ammunition for use with launchers?

mortar-like. Generally propellant-like cartridges

comprise a cartridge made of cardboard or other material which, when the charge ignites,

easily made to explode by the increase in pressure

" . .. ' " . " ? ?" _ internal combustion caused by burning of the powder

. .

* re propellant _unless the cartridge is sup-_j ;

carried on its external side. Therefore, normally the

[propellant cartridge is placed in a special [ i . -jtube which is perforated by a number of lateral openings and which constitutes the rear end

[ ' 7~~" : . ! -[of the grenade that is to be fired. When the car-

> ? [the propellant cartridge is fired, the ; ? ? _ _ [cardboard cartridge explodes on the perforation of the gases of the pow-

protruding pins guide the grenade out of the barrel.

|The ignition of the powder normally occurs by means of-[ ?

! zo of a detonator positioned at the bottom of the cartridge

! !a propellant that is forced against a per- 1 .

[ I [firing pin positioned on the bottom of the barrel intended for the grenade in question. j

! ? j The general structure of the cartridge has been successfully used for many years. Previously, ignition of the propellant charge was usually achieved by means of an igniter which ignited a primer charge or cap which in turn ignited the propellant powder charge. In order to achieve central ignition of the propellant powder charge, the

; previously a hollow metal tube had been placed above the primer. This tube extended approximately halfway up the height of the charge. The flame coming from the ? S

| the priming charge was thus guided towards the centre of the propellant powder charge and . ?? a central ignition was achieved. The burn of the propellant powder then spread ? j

?

| from the center of the charge toward its ends. This ignition system has been considered satisfactory as a type I ignition system. A switch to larger propellant charges and more modern powder types, among other things to achieve longer throws, has in the meantime created certain problems. Consequently, it has been found that these older ignition systems can, under very cold conditions, cause a back pressure in the propellant cartridge before it is punctured, which, in combination with more modern and more powerful propellant charges, can cause the propellant tube to explode. _|

This invention relates to a completely new process for lighting a...

. . |

gas-generating propellant, which consists of a propellant powder in the form of loosely packed particles.,Also included in the invention is a device suitable for the method as described.

. . . T"

in the invention, which is also described - - . as a gas-generating propellant cartridge for use with - mu-f ? I

invention for mortar launchers in the form of explosive grenades, anti-explosive grenades, and smoke grenades. In general, the invention should be applicable to any type of gas-generating propellant cartridge using loosely packed propellant powder, and also those types having steel cartridges so constructed as to withstand the increased internal pressure formed when the propellant powder burns. In accordance with the invention, a propellant powder tube is placed laterally above the propellant powder charge. One end is a

the powder tube is connected to the igniter or *

|lens-projector cartridge ignition composition. !; " ' " ~. ^ . .. .

The transmission of ignition to the propellant powder occurs by means of the igniter which can be reinforced with a reinforcing composition, which ignites the internal jacket of the powder tube.

king, and when the pressure from the powder gases formed by the internal combustion is greater than the resistance of the remainder of the powder tube, it is blown to pieces, whereupon the surrounding powder is instantly ignited.

- _ - * - along the entire length of the propellant cartridge.

! lens. In this way a radial ignition is obtained which, when it occurs instantaneously along the entire length of the propellant cartridge, does not cause any harmful back pressure. j 1 ? j 1 ! The invention is defined in the patent claims and is further described using the accompanying figures as an explanatory element. | 1 | Figure 1 shows a schematic side section of a finned illuminating grenade while | Figure 2 shows a side section through a propellant charge as described by the invention.

j intended for a high-explosive grenade, a grenade il-? ? :

luminant or smoke grenade, for use with a mortar launcher. j ? i The finned illuminating grenade shown

i

* i i

The grenade in figure 1 consists of a grenade body 2, which contains an active payload which in this case consists of an illuminating charge 3 with a parachute 4 and a fuse 5. At the rear end of the grenade there is a propellant cartridge tube 6 inside which the propellant cartridge 7 is positioned. This in turn consists of a cardboard cartridge 8 containing a propellant charge 9. At the rear end of the cardboard cartridge there is an impact detonator 10. The propellant cartridge tube 6 is provided with gas outlet openings 11 through which the cardboard cartridge is fired. \ ne 8 explodes following the increase in pressure in-

! ' ' : ? "? 1 ^

theme that occurs when the propellant powder is ignited, and a bottom opening 12 through which the firing pin of the ejection tube can reach the impact detonator 10 of the grenade in question.

- - ?In figure 2 a more detailed cross-section of the propellant cartridge .7 is shown. From the figure it can be seen that the cardboard cartridge 8 is closed and held at the bottom by a cartridge 10a with a reinforced brass bottom, on which the impact detonator 10 is cast. The impact detonator 10 can be reinforced, for example, with a r? . . .

' compressed black powder tablet to ensure a ?j "V?

1

The rapid ignition of the inside of the powder tube. The other end of the cardboard cartridge is sealed with a brass cover or cap.

| the end 13. A powder tube 14 is fused i

; on the impact igniter 10. The powder tube 14 extends from the impact igniter to the inside of the end cap 13. As a result of this, a special cover is not necessary to keep the inside of the powder tube free

! from the surrounding propellant powder ? formed j by loosely packed particles. The tube I

; of the powder may also be terminated just below the upper end surface of the charge, provided that the upper end of the powder tube is provided with its own upper seal which will keep the inside of the tube free of loose propellant powder. With this in mind, the powder tube should not be made so short that an ignition I

[ instantaneous axial burst along the entire length of the propellant powder cannot occur when the powder tube bursts due to the increase in internal pressure caused by the powder gases ! ;

? developed internally to the powder tube. j ? CLAIMS _ 1 .1. Method of ' ignition ' of a cartridge ? l i

-I a gas-generating propellant loaded with loosely packed propellant powder, characterized

t _o _ from the fat _t _o _che . the _p _ol _ve _r _e __ _prope _l.l.e..n.t. .And. _Yes . to . .cce _n _d _e _ _ i! i instantly along the entire length of the charge-

ca through a propellant powder tube ac- ! s r coupled axially with respect to the charge which is :

ignited internally by a detonator fused to the tube! .

I of the powder or on the ignition charge. :

?

1- _ 2. _ Ignition arrangement, for the instantaneous axial ignition of a gas-generating propellant charge consisting of loosely packed propellant powder according to claim 1, consisting of a portion of the propellant powder with one end fused to a charge of the ignition device, arranged axially at the same time as the ignition device.

within the propellant charge massed in a loosely packed way._ _ _ ! ....

| _ 3?_ Ignition arrangement according to the

. .

claim 2 characterized in that the tip of the propellant powder extends from one end

mit? of the charge where it is fused on the ignition charge?

, yes one or on the, detonator, up to its other end - ?> ?

' t? where it extends upwards to the top charge seal which keeps the powder \ loosely packed surrounding the powder tube separate from the inside of the powder tube

; king.

< 4. Arrangement according to claim 3 characterized in that the powder tube i consists of a double-base powder with base of

? ''j ? ! cell nitrate?, not fortified.

?i

- - -- 1- 5. ?Car tue eia -a-prope llent e.-gene rant e._ga s _

i

- _ _ _ [ .for ?ammunition? for .devices .for .dead_throwing .me- _ i . ..

- - Ballot boxes? grana t e... e sp lo si ve_t_.granat e . the luminants _o_. grenade and _ _ Smoke bomb ..O? similar second, any. _delle._riven.click a- _ _ L-tions- da- -l-a?4 f--Compr-endente__una...c.ar_tuc.c_i.a...pro_t_e.tti~ _

1?

_ Lva ci 1ind r i c a .made._from. cardboard __or si- material _

j

_ ! | Sealed at both ends and filled with a propellant powder made up of particles _

1 I

_ Lamina ssat e__i n_ way_scipltp_ _ that_,,_.when_l a__c artuc c i a_ _ _ i

i

_ i. _ _ _ Lviene -Shooted, _and splo.d.e_i.n__following the increase in pressure s-!

___ _ ?_ internal combustion created by the combustion of dust _

1 . . ' I

_ ? propellant, on those points where the cartridge is not otherwise reinforced, and on which an element of

i ? 1 _ ; _ |_fixing_. for a. detonator or igniter charge _ _ _ _ [_?._positioned in one_of the sealed closures of. the ends _ _ |_mit? of the cartridge, characterized in that _

f t

Claims (1)

ji'un tube of propellant powder. .double-base lens with ;unreinforced nitrocellulose base? arranged asj ~ " . ' ' . . " " ' *. ! [sial__ through_the_1_propellant_cartridge 1 i one of its exhaust-sealed closures, where the inside of the powder tube is connected to the detonator or igniter charge near its ] other end seal, j For compliant translation For ING. BARZANO * & Z AM ARDO ROMA. S.p. A. BA/cog. - ? i.