CA1328772C - Smoke charge for training mine - Google Patents
Smoke charge for training mineInfo
- Publication number
- CA1328772C CA1328772C CA 590559 CA590559A CA1328772C CA 1328772 C CA1328772 C CA 1328772C CA 590559 CA590559 CA 590559 CA 590559 A CA590559 A CA 590559A CA 1328772 C CA1328772 C CA 1328772C
- Authority
- CA
- Canada
- Prior art keywords
- disk
- smoke
- charge
- charge according
- composition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
- F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
- F42B12/36—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information
- F42B12/46—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information for dispensing gases, vapours, powders or chemically-reactive substances
- F42B12/48—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information for dispensing gases, vapours, powders or chemically-reactive substances smoke-producing, e.g. infrared clouds
Abstract
SMOKE CHARGE FOR TRAINING MINE
ABSTRACT OF THE DISCLOSURE
A spotting charge for a training mine comprises a can body with a smoke opening in one end and a cover closing the opposite end. The smoke opening is closed with a plastic film tape. Within the can body is a disk of slow burning smoke generating compound. To accelerate the burning as much as possible, the disk is perforated with a large number of through holes. On one side of the disk is a layer of primed cambric for igniting the smoke composition. The cambric itself is ignited by an elec-trically fired igniter squib. The smoke from the smoke composition passes through a baffle arrangement before reaching the smoke exit. This provides sufficient cool-ing of the volatilized smoke/die composition that flaming is prevented at the exit port.
ABSTRACT OF THE DISCLOSURE
A spotting charge for a training mine comprises a can body with a smoke opening in one end and a cover closing the opposite end. The smoke opening is closed with a plastic film tape. Within the can body is a disk of slow burning smoke generating compound. To accelerate the burning as much as possible, the disk is perforated with a large number of through holes. On one side of the disk is a layer of primed cambric for igniting the smoke composition. The cambric itself is ignited by an elec-trically fired igniter squib. The smoke from the smoke composition passes through a baffle arrangement before reaching the smoke exit. This provides sufficient cool-ing of the volatilized smoke/die composition that flaming is prevented at the exit port.
Description
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SMOKE CHARGE FOR TRAINING MINE
FIELD OF THE INVENTION
:
The present invention relates to training mines and more particularly to smoke charges and components thereof for training mines.
BACKGROUND
Training mines are often provided with smoke ,:
, generating spotting charges that should, for the most effective use of the training mine, produce a large emis-` sion of smoke in a relatively short interval, for example over a 7 second time period. However, the smoke generat-,~. .
ing compositions are frequently quite slow burning and a solid body of a slow burning composition is incapable of producing the desired amount of smoke in the desired short time. Where rapid combustion is achieved, it is important to avoid flaming of the hot volatilized smoke and dye as it is emitted into the air.
The present invention aims at the provision of a smoke generating component and a spotting charge con-taining the component that meet the desired criteria.
SUMMARY
According to one aspect of the present inven-tion there is provided a smoke generating component for a training mine spotting charge, comprising a disk of slow ,~
..
- 1 - .
.~
SMOKE CHARGE FOR TRAINING MINE
FIELD OF THE INVENTION
:
The present invention relates to training mines and more particularly to smoke charges and components thereof for training mines.
BACKGROUND
Training mines are often provided with smoke ,:
, generating spotting charges that should, for the most effective use of the training mine, produce a large emis-` sion of smoke in a relatively short interval, for example over a 7 second time period. However, the smoke generat-,~. .
ing compositions are frequently quite slow burning and a solid body of a slow burning composition is incapable of producing the desired amount of smoke in the desired short time. Where rapid combustion is achieved, it is important to avoid flaming of the hot volatilized smoke and dye as it is emitted into the air.
The present invention aims at the provision of a smoke generating component and a spotting charge con-taining the component that meet the desired criteria.
SUMMARY
According to one aspect of the present inven-tion there is provided a smoke generating component for a training mine spotting charge, comprising a disk of slow ,~
..
burning smoke generating composition, formed with a plurality of perforations therethrough, the disk having a predetermined diameter and a thickness substantially less than the diameter so as to provide a large surface area for rapid combustion of the slow burning composition.
According to another aspect of the present invention there is provided a spotting charge for a training mine comprising:
a can body with a smoke opening in a first end thereof;
a can cover for closing an opposite second end of the can body;
a disk of slow burning smoke generating composition mounted in the can body between the first and second ends, the disk being formed with a plurality of unobstructed perforations therethrough; and means in the can body for igniting the disk of smoke generating composition.
The use of a relatively thin disk with a large number of through perforations substantially increases the burning surface area of the smoke composition without unduly complicating the design and production of the charge.
:
In preferred embodiments of the invention, the smoke is passed through a baffle system in the can body to cool the smoke, preventing flaming at the smoke Gutlet.
A
.
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:-charge;
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawings, which illustrate an exemplary embodiment of the present invention:
Figure 1 is an isometric view of a spotting charge;
Figure 2 is an axial section of the spotting charge;
Figure 3 is an isometric view of the smoke com-position disk;
Figure 4 is a plan view of a baffle disk usedin the charge; and Figure 5 is a plan view of a baffle deflector disk.
DETAILED DESCRIPTION
-Referring to the drawings, and especially to Figure 1, there is illustrated a smoke generating spotting charge 10 that includes a can body 12 of drawn aluminum with a can cover 14 of moulded styrene closing one end of the body. A pair of contact pins 16 extend through the can cover 14 for electrical contact with the training mine which the charge is used so that the charge may be ignited. Near the end of the can body 12 opposite the cover 14, the can has a line of knurling 18. This ~-allows the can to be gripped for removal from the training mine. A groove 20 around the can body adjacent ~ 1 328772 the knurled area carries an o-ring 22.
The internal configuration of the charge is illustrated most particularly in Figure 2. The end of the can body opposite the cover 14 has a central smoke ,, outlet opening 24. This is normally covered with a plastic film tape 26 on the outside of the can body.
i;
Adjacent the bottom of the can body is a spacer ring 28 in the form of a short section of wound paper tube. This supports a deflector 30 at a spacing from the end of the can body. The deflector is a flat plate with a central opening 32 smaller than the smoke opening 24, and a pair of slightly larger openings 34 offset to one side.
A second paper spacer 36 extends from the deflector 30 to a disk 38 with its peripheral edge , ;, engaged between the spacer 36 and the groove 20 in the side wall of the can body 12. The disk 38 has a central opening 40 that is the same size as the smoke outlet opening 24.
A flat disk 42 of smoke generating composition is engaged with the groove 20, on the opposite side from disk 38. This component consists of DND castable yellow composition SK-351-J cast into a thin disk perforated by twenty-two circular holes 43 uniformly distributed over the disk. The outer edge of the disk is a paper tube : 1 S28772 ~ . .
ring, like the spacers 36 and 28. Over the face of the smoke composition disk 42 is a layer 48 of primed cam-bric. This in turn is covered with a disk 50 with a cen-tral opening 52. The disk 50 is of the same configuration as the disk 38. A paper spacer 54 engages between the disk S0 and a PVC igniter support disk 56 at a position spaced from the disk 50. The support disk 56 carries an igniter squib 58 in the centre, confronting the layer of cambric 48 through the central opening 52 in s the disk 50. A paper spacer tube 60 extends between the , PVC support disk and the can cover 14. The cover 14 is secured in place with a groove 62 rolled into the side wall of the can body adjacent the end carrying the cover 14 and a layer of adhesive 64 between the can cover and . .
the can body. The igniter squib 58 is connected to the two contact pins 16 by wires 66.
In operation of the smoke charge, the elec-., trically fired igniter squib spits flame on the primed cambric 48. The fast burning cambric quickly ignites the perforated disk of smoke composition. Because of the large surface area of the smoke composition, a large amount of smoke is generated very quickly despite the fact that the composition itself is very slow burning.
The baffle system, including the disk 38 and the deflec-, f ~ ~28772 :
:;' tor 30 provide a series of chambers within the can body , through which the smoke passes before exiting the smoke outlet opening 24. This provides ample cooling of the ; volatilized smoke/dye composition to prevent flaming at the exit port of the charge.
~ When the charge is fired, a puff of dark smoke D from the ignition system initially clears the smoke outlet tape 26 and immediately turns to a flow of bright - yellow smoke for a few seconds.
-~ While one embodiment of the present invention ., ,j has been described in the foregoing, it is to be under-. .:
, stood that other embodiments are possible within the ~' scope of the invention. The invention is to be construed '-~ as limited solely by the appended Claims.
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According to another aspect of the present invention there is provided a spotting charge for a training mine comprising:
a can body with a smoke opening in a first end thereof;
a can cover for closing an opposite second end of the can body;
a disk of slow burning smoke generating composition mounted in the can body between the first and second ends, the disk being formed with a plurality of unobstructed perforations therethrough; and means in the can body for igniting the disk of smoke generating composition.
The use of a relatively thin disk with a large number of through perforations substantially increases the burning surface area of the smoke composition without unduly complicating the design and production of the charge.
:
In preferred embodiments of the invention, the smoke is passed through a baffle system in the can body to cool the smoke, preventing flaming at the smoke Gutlet.
A
.
.
:-charge;
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawings, which illustrate an exemplary embodiment of the present invention:
Figure 1 is an isometric view of a spotting charge;
Figure 2 is an axial section of the spotting charge;
Figure 3 is an isometric view of the smoke com-position disk;
Figure 4 is a plan view of a baffle disk usedin the charge; and Figure 5 is a plan view of a baffle deflector disk.
DETAILED DESCRIPTION
-Referring to the drawings, and especially to Figure 1, there is illustrated a smoke generating spotting charge 10 that includes a can body 12 of drawn aluminum with a can cover 14 of moulded styrene closing one end of the body. A pair of contact pins 16 extend through the can cover 14 for electrical contact with the training mine which the charge is used so that the charge may be ignited. Near the end of the can body 12 opposite the cover 14, the can has a line of knurling 18. This ~-allows the can to be gripped for removal from the training mine. A groove 20 around the can body adjacent ~ 1 328772 the knurled area carries an o-ring 22.
The internal configuration of the charge is illustrated most particularly in Figure 2. The end of the can body opposite the cover 14 has a central smoke ,, outlet opening 24. This is normally covered with a plastic film tape 26 on the outside of the can body.
i;
Adjacent the bottom of the can body is a spacer ring 28 in the form of a short section of wound paper tube. This supports a deflector 30 at a spacing from the end of the can body. The deflector is a flat plate with a central opening 32 smaller than the smoke opening 24, and a pair of slightly larger openings 34 offset to one side.
A second paper spacer 36 extends from the deflector 30 to a disk 38 with its peripheral edge , ;, engaged between the spacer 36 and the groove 20 in the side wall of the can body 12. The disk 38 has a central opening 40 that is the same size as the smoke outlet opening 24.
A flat disk 42 of smoke generating composition is engaged with the groove 20, on the opposite side from disk 38. This component consists of DND castable yellow composition SK-351-J cast into a thin disk perforated by twenty-two circular holes 43 uniformly distributed over the disk. The outer edge of the disk is a paper tube : 1 S28772 ~ . .
ring, like the spacers 36 and 28. Over the face of the smoke composition disk 42 is a layer 48 of primed cam-bric. This in turn is covered with a disk 50 with a cen-tral opening 52. The disk 50 is of the same configuration as the disk 38. A paper spacer 54 engages between the disk S0 and a PVC igniter support disk 56 at a position spaced from the disk 50. The support disk 56 carries an igniter squib 58 in the centre, confronting the layer of cambric 48 through the central opening 52 in s the disk 50. A paper spacer tube 60 extends between the , PVC support disk and the can cover 14. The cover 14 is secured in place with a groove 62 rolled into the side wall of the can body adjacent the end carrying the cover 14 and a layer of adhesive 64 between the can cover and . .
the can body. The igniter squib 58 is connected to the two contact pins 16 by wires 66.
In operation of the smoke charge, the elec-., trically fired igniter squib spits flame on the primed cambric 48. The fast burning cambric quickly ignites the perforated disk of smoke composition. Because of the large surface area of the smoke composition, a large amount of smoke is generated very quickly despite the fact that the composition itself is very slow burning.
The baffle system, including the disk 38 and the deflec-, f ~ ~28772 :
:;' tor 30 provide a series of chambers within the can body , through which the smoke passes before exiting the smoke outlet opening 24. This provides ample cooling of the ; volatilized smoke/dye composition to prevent flaming at the exit port of the charge.
~ When the charge is fired, a puff of dark smoke D from the ignition system initially clears the smoke outlet tape 26 and immediately turns to a flow of bright - yellow smoke for a few seconds.
-~ While one embodiment of the present invention ., ,j has been described in the foregoing, it is to be under-. .:
, stood that other embodiments are possible within the ~' scope of the invention. The invention is to be construed '-~ as limited solely by the appended Claims.
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Claims (15)
- CLAIMS:
(1) A smoke generating component for a training mine spotting charge, comprising a disk of slow burning smoke generating composition, formed with a plurality of perforations therethrough, the disk having a predetermined diameter and a thickness substantially less than the diameter so as to provide a large surface area for rapid combustion of the slow burning composition. - (2) A component according to claim 1 wherein the disk is substantially flat.
- (3) A component according to claim 2 wherein the outer edge of the disk is a spacer ring.
- (4) A component according to claim 3 wherein the ring is a wound paper tube.
- (5) A component according to claim 1, 2 or 3 wherein the perforations are circular holes uniformly distributed over the disk.
- (6) A spotting charge for a training mine comprising:
a can body with a smoke opening in a first end thereof;
a can cover for closing an opposite second end of the can body;
a disk of slow burning smoke generating composition mounted in the can body between the first and second ends, the disk being formed with a plurality of unobstructed perforations therethrough; and means in the can body for igniting the disk of smoke generating composition. - 7. A charge according to Claim 1 wherein the disk is substantially flat.
- 8. A charge according to Claim 7 wherein the outer edge of the disk is a spacer ring.
- 9. A charge according to Claim 8 wherein the spac-er ring is wound paper.
- 10. A charge according to Claim 6, 7 or 8 wherein the perforations are circular holes uniformly distributed over the disk.
- 11. A charge according to Claim 6 wherein the means for igniting the disk comprise a layer of primed cambric on that side of the smoke generating disk facing towards the second end of the can body.
- 12. A charge according to Claim 11 wherein the means for igniting the disk further comprise a squib in the can body adjacent the cambric layer.
- 13. A charge according to Claim 12 including con-tact pins in the can cover, and wires leading from the contact pins to the squib.
- 14. A charge according to Claim 6 including baffle means in the can body between the smoke generating disk and the smoke opening.
- 15. A charge according to Claim 14 wherein the baffle means comprise a pair of spaced apart disks mount-ed in the can body, the disks having openings there-through for deflecting the flow of smoke through a plur-ality of chambers in the can body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 590559 CA1328772C (en) | 1989-02-09 | 1989-02-09 | Smoke charge for training mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 590559 CA1328772C (en) | 1989-02-09 | 1989-02-09 | Smoke charge for training mine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1328772C true CA1328772C (en) | 1994-04-26 |
Family
ID=4139595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 590559 Expired - Fee Related CA1328772C (en) | 1989-02-09 | 1989-02-09 | Smoke charge for training mine |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1328772C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013096702A3 (en) * | 2011-12-21 | 2013-10-03 | Electrawatch, Inc. | A passive alarm to prevent buried infrastructure damage |
-
1989
- 1989-02-09 CA CA 590559 patent/CA1328772C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013096702A3 (en) * | 2011-12-21 | 2013-10-03 | Electrawatch, Inc. | A passive alarm to prevent buried infrastructure damage |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |