EP0630465A1 - Device for positioning dispersible sub-ammunition. - Google Patents
Device for positioning dispersible sub-ammunition.Info
- Publication number
- EP0630465A1 EP0630465A1 EP94900192A EP94900192A EP0630465A1 EP 0630465 A1 EP0630465 A1 EP 0630465A1 EP 94900192 A EP94900192 A EP 94900192A EP 94900192 A EP94900192 A EP 94900192A EP 0630465 A1 EP0630465 A1 EP 0630465A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tongues
- mine
- submunition
- face
- positioning device
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B23/00—Land mines ; Land torpedoes
- F42B23/24—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B10/00—Means for influencing, e.g. improving, the aerodynamic properties of projectiles or missiles; Arrangements on projectiles or missiles for stabilising, steering, range-reducing, range-increasing or fall-retarding
- F42B10/32—Range-reducing or range-increasing arrangements; Fall-retarding means
- F42B10/48—Range-reducing, destabilising or braking arrangements, e.g. impact-braking arrangements; Fall-retarding means, e.g. balloons, rockets for braking or fall-retarding
- F42B10/50—Brake flaps, e.g. inflatable
Definitions
- the field of the present invention is that of positioning devices for dispersible submunitions and in particular for bi-directional mines with shaped charge.
- the addition certificate FR2475716 discloses a bi-directional dispersible mine with a formed charge.
- US Pat. No. 3,205,322 describes an anti-personnel mine dispersible by aircraft.
- This mine has elastic tongues attached to its rear part. The tongues open when the mine falls, which makes it possible to stabilize the attitude of the latter with its front end directed towards the ground.
- Such an arrangement makes it possible to orient the submunition favorably relative to the ground but it does not make it possible to improve the posability on hard ground, the mine then lying laterally and becoming ineffective.
- the subject of the invention is a positioning device for a submunition, of the bidirectional dispersible mine type, and comprising a set of flexible tongues regularly distributed around the submunition, device characterized in that the distribution of the tongues is such that the result of the aerodynamic forces exerted on the submunition has its point of application behind the center of gravity of the latter, and in that the tongues integral with a face situated at the level of a rear part of the submunition in its direction of travel of its trajectory have a shape such that they undergo permanent deformation during the dispersion of the mine.
- the positioning device is intended to equip a submunition dispersed by a vector animated with a rotational movement, such as an artillery cargo shell, it is characterized in that the tongues undergo a deformation permanent under the effect of centrifugal force.
- the distribution of the tongues is such that they are all integral with a face situated at the level of a rear part of the submunition in its direction of travel of its trajectory.
- the distribution of the tongues is such that the aerodynamic resistance resulting from the lan ⁇ guettes integral with a face situated at the rear part of the submunition in its direction of travel of its trajectory is greater than that of tabs secured to a face opposite the rear face.
- the number of tongues secured to the front face may be equal to that of the tongues secured to the rear face and the surface of the tongues secured to the rear face may be greater than that of the tongues secured to the front face.
- the tongues integral with the front face are produced in the form of folded wires.
- the tongues integral with the rear face of the submunition make in an deployed position an angle with the axis of the submunition which is such that the diameter of a circle on which their ends are distributed. free is more than twice the height of the submunitio.
- the deformable tongues have a geometry such that they have a cross section which decreases regularly from the base of the tongue towards its free end.
- the deformable tongues may have a longitudinal opening whose width increases regularly from the base of the tongue towards its free end.
- FIG. 1 shows schematically and in partial section a bidirectional mine equipped with a device positioning according to the state of the art
- FIG. 2 represents in partial section a bidirectional mine equipped with a positioning device according to a first embodiment of the invention
- FIG. 3 is a view of the mine of FIG. 2 in the direction X,
- FIG. 4 represents in partial section a bidirectional mine equipped with a positioning device according to a second embodiment of the invention
- FIG. 5 is a detailed view of one of the tongues secured to the front face of the mine according to FIG. 4,
- FIGS. 6 and 7 show a bidirectional mine equipped with a positioning device according to a third embodiment of the invention.
- FIGS. 8a and 8b represent a single tongue, FIG. 8b being a section of the tongue along the plane whose trace AA is identified in FIG. 8a.
- FIG. 8c shows the bidirectional lead of FIGS. 6 and 7 after the permanent deformation of the tongues
- FIG. 9 shows diagrammatically the arrival of a mine equipped with a device according to the invention on loose soil
- FIGS. 10a and 10b show diagrammatically the arrival of a mine equipped with a device according to the invention on hard ground.
- a submunition 1 of the dispersible mine type according to the state of the art represented by the certificate of addition FR2475716, comprises a housing 2 containing an explosive charge 3.
- the latter comprises, in a known manner and described by FR2475716, two coatings (the coatings of this charge are not shown).
- the housing 2 is embedded in a damping structure 4 made of plastic.
- Two metal washers 5 and 6 are positioned on annular notches 7 and 8 arranged respectively on the flat faces 9 and 10.
- the washers are made integral with the mine by means of tie rods 11, regularly distributed angularly, and which pass through the mine.
- the ends of the tie rods are riveted on the washers 5 and 6.
- the mine also has flexible tongues 12 regularly distributed around its periphery. One end of these tongues is made integral with one face of the mine at the level of the rivets 13a, 13b of the tie rods 11 on the washers 5 or 6. The other end of the tongues is free and lies substantially in a median plane 14 of the mine.
- a certain number of tongues is fixed on the face 10
- an equal number of tongues is fixed on the face 9.
- the tongues integral with one face are arranged in angular alternation with the tongues integral with the other side.
- the tongues 12 can be folded into housings 15 arranged in the damping structure 4. They are thus folded when the mine is placed inside a shell or a launching tube. They deploy when the mine is ejected from the shell or the launch tube.
- the elastic tabs make it possible to solve the problem of the orientation of the mine on hard ground, but they are completely inoperative on a loose ground in which the mines sink in a random position what which makes them ineffective.
- FIG. 2 represents a submunition 1, of the bidirectional mine type with a shaped charge, which is equipped with a positioning device according to a first embodiment of the invention.
- This mine 1 also includes two metal washers 5 and 6 which are positioned on annular notches 7 and 8 arranged respectively on the flat faces 9 and 10.
- the washers are made integral with the mine by means of tie rods 11 regularly angularly distributed and which pass through the mine.
- the ends of the tie rods are fixed by rivets 13a, 13b on the washers 5 and 6.
- the mine 1 here comprises sixteen tongues 16 regularly angularly distributed and one end of which is made integral with the face 10 of the mine at the level of the rivets 13b of the tie rods 11 on the washer 6.
- the face 10 of the mine is that which is located at the rear of the mine in its direction of travel of its trajectory after it is ejected from a shell or from a disperser tube.
- This arrangement stabilizes the mine and enables it to maintain a constant attitude on its trajectory, the face 9 oriented towards the front and the face 10 oriented towards the rear.
- the tongues can be folded into housings 15 arranged in the damping structure 4.
- the free ends of the tongues are in a plane 17 which is closer to the front face 9 of the mine than to the rear face 10 on which the tongues are fixed.
- the tongues thus have a length greater than half the height H of the mine.
- Some tongues 16a have an opening 18, they are placed alternately with tongues 16b without opening.
- the tongues make in their deployed position an angle with the axis 19 of the lead which is such that the diameter D of a circle on which their free ends are distributed is greater than once and half the height H of the mine (for a mine whose height is substantially equal to the half external diameter of the damping structure 4).
- Figure 4 shows a second embodiment of the positioning device according to the invention.
- the face 10, or rear face of the mine carries tongues 20b regularly distributed angularly and which are made integral with the mine by the rivets 13b of the tie rods 11.
- the face 9, or front face of the mine carries tongues 20a regularly distributed angularly.
- the free ends of the tongues 20a and 20b lie substantially in the median plane 14 of the mine.
- the tongues can be folded into housings 15 arranged in the damping structure 4.
- the tongues 20a which are integral with the front face
- openings 18a 9 of the mine have openings 18a, and the tongues 20b which are integral with the rear face 10 of the mine have openings 18b.
- the dimensions of the openings 18a and 18b are such that the surface of the tongues 20b secured to the rear face
- tongues 20a at the front face will limit the penetration of the mine into loose soil.
- the tongues 20a will be manufactured by bending a metal wire and spot welding 21 of this wire on the washer 5 (see FIG. 5).
- the washer 5 is made integral with the front face 9 by the rivets 13a of the tie rods 11.
- the tongues make in their deployed position an angle with the axis 19 of the lead which is such that the diameter D of a circle on which their free ends are distributed is greater than twice the height H from mine.
- FIGS. 2 to 5 show positioning devices more particularly adapted to mines intended to be dispersed by tubes or non-gyrating or weakly gyrating vectors (such as rockets or planing missiles).
- Figures 6 and 7 show a third embodiment of the positioning device according to the invention, embodiment more particularly intended to equip mines, which are dispersed by a vector animated by a rotational movement, such as a cargo shell d 'artillery.
- the mine carries eight tongues 22 which are all fixed on its rear face 10. No tongue is fixed on the front face 9.
- the method of fixing the tongues is the same as that described for the previous embodiments ( riveting the tie rods on the washer which is fixed on the rear face 10).
- Figures 8a and 8b show a tongue 22 alone in two orthogonal views.
- This tab is made of folded sheet steel. It comprises a rear fold 23 on which a hole 24 is drilled allowing the fixing of the tongue on the rear face 10 of the mine. It also includes a front spout 25 and a longitudinal opening 26. The opening thus delimits two branches 27a, 27b on the tongue 22 The front spout 25 secures the two branches 27a and 27b and thus ensures a certain rigidity at the free end of the tongue 22 which avoids deterioration during the assembly phases.
- the width of the longitudinal opening 26 increases regularly from the base of the tongue 22 towards its free end. This arrangement has the effect of regularly decreasing the cross section of the tongue between its base and its free end.
- the variation profile of the section of the tongue is chosen so that, when the tongue is subjected to centrifugal force during the ejection of the lead, the elastic limit of the tongue is reached at certain points without the breaking strength limit is not exceeded. It is thus possible to obtain a permanent and controlled deformation of the tongues.
- the profile of the tongue after deformation will be chosen so as to ensure sufficient aerodynamic resistance of the tongues to ensure the stabilization of the mine and allow it to maintain a constant attitude on its trajectory, the face 9 facing forward and the face 10 rear-facing.
- Figure 8c shows the mine after it was ejected from a cargo shell.
- the tongues 22 then have a permanent deformation and their free ends are distributed over a circle whose diameter D is greater than twice the height H of the mine.
- Another advantage of such an embodiment of the invention is that the tongues have, after permanent deformation, a certain rigidity which improves the return of the mine bearing on the ground at one of its flat faces, when 'it fell on its edge after bouncing on hard ground. It is therefore possible to obtain both a large value of diameter D and a high rigidity of the deployed tongues.
- tongues without opening 26 but whose cross section nevertheless decreases regularly from the base of the tongue towards its free end.
- the shape of the tongues will then be substantially triangular or trapezoidal.
- Figure 9 shows schematically the arrival of a mine 1 equipped with a positioning device according to the invention on a loose soil 28.
- the presence of the tabs 22 fixed on the rear face 10 ensures an arrival of the mine with a constant attitude on its trajectory.
- the trajectory is marked by curve 29 in dotted lines.
- the mine is represented in 30a and 30b in the last moments before its impact on the ground 28.
- the mine touches the ground by its front face 9 which sinks into the loose soil. The penetration is limited by the presence of the tabs 22.
- the mine is therefore positioned correctly on the ground (position 30c) with its rear face 10 substantially parallel to the ground and oriented towards a possible target.
- FIGS. 10a and 10b show diagrammatically the arrival of a mine 1 equipped with a positioning device according to the invention on hard ground 31.
- the presence of the tongues 22 fixed on the rear face 10 still ensures the arrival of mine on ground 31 with a constant attitude on its trajectory.
- the trajectory is marked by curve 29 in dotted lines.
- the mine is represented in 32a at the time of its impact on hard soil 31.
- the mine rebounds and follows a trajectory identified by the curve 33. It then falls either on one of its flat faces 9 or 10 (case not shown here and corresponding to a correct position of the mine on the ground), or on its edge (position 32c).
- tongues 22 whose free ends are on a circle with a diameter greater than twice the height of the mine allows it to tilt (position 32d or 32f), ie towards the equilibrium position 32e with the face rear 10 in contact with the ground, or towards the equilibrium position 32g with the front face 9 in contact with the ground (FIG. 10b).
- any one of the positions 32g or 32e allows correct subsequent operation.
- Such a variant makes it possible to apply the invention to submunitions which are ejected from a disperser which is not driven in a rotational movement or else whose rotational movement is too slow for the centrifugal force to be able to deform the tabs (rocket, missile or bomb type disperser). To do this, it suffices to dimension the profile of each tab as a function of the air resistance forces encountered with the chosen dispersion system.
- the tongue will in all cases have the shape of a beam of equal resistance to bending.
- Such an arrangement makes it possible, as has been described above, to improve the braking of the submunition since the tongues remain deployed even after braking and it also makes it possible to promote the posability of the submunition on hard ground.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Portable Nailing Machines And Staplers (AREA)
- Soil Working Implements (AREA)
- Catching Or Destruction (AREA)
- Lifting Devices For Agricultural Implements (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
- Manufacturing Of Electrical Connectors (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Body Structure For Vehicles (AREA)
- Moving Of Heads (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9214578 | 1992-12-03 | ||
FR9214578A FR2698957B1 (en) | 1992-12-03 | 1992-12-03 | Positioning device for dispersible submunition. |
PCT/FR1993/001117 WO1994012848A1 (en) | 1992-12-03 | 1993-11-16 | Device for positioning dispersible sub-ammunition |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0630465A1 true EP0630465A1 (en) | 1994-12-28 |
EP0630465B1 EP0630465B1 (en) | 1997-10-01 |
Family
ID=9436193
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94900192A Expired - Lifetime EP0630465B1 (en) | 1992-12-03 | 1993-11-16 | Device for positioning dispersible sub-ammunition |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0630465B1 (en) |
JP (1) | JPH07503531A (en) |
AT (1) | ATE158859T1 (en) |
DE (1) | DE69314329T2 (en) |
FR (1) | FR2698957B1 (en) |
SG (1) | SG49870A1 (en) |
WO (1) | WO1994012848A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11054230B1 (en) * | 2018-06-14 | 2021-07-06 | The United States Of America As Represented By The Secretary Of The Navy | Flexible anti-personnel mine |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3205322A (en) * | 1962-11-27 | 1965-09-07 | Jr Edwin G Reed | Destructible magnetic switch |
FR2475716B2 (en) * | 1980-02-11 | 1985-11-29 | France Etat | BIDIRECTIONAL DISPERSABLE MINE WITH FORMED LOAD |
GB2248804A (en) * | 1990-10-19 | 1992-04-22 | Marconi Gec Ltd | Air-launched buoys |
-
1992
- 1992-12-03 FR FR9214578A patent/FR2698957B1/en not_active Expired - Fee Related
-
1993
- 1993-11-16 WO PCT/FR1993/001117 patent/WO1994012848A1/en active IP Right Grant
- 1993-11-16 EP EP94900192A patent/EP0630465B1/en not_active Expired - Lifetime
- 1993-11-16 DE DE69314329T patent/DE69314329T2/en not_active Expired - Fee Related
- 1993-11-16 SG SG1996007918A patent/SG49870A1/en unknown
- 1993-11-16 JP JP6512830A patent/JPH07503531A/en active Pending
- 1993-11-16 AT AT94900192T patent/ATE158859T1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9412848A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPH07503531A (en) | 1995-04-13 |
FR2698957A1 (en) | 1994-06-10 |
DE69314329T2 (en) | 1998-01-29 |
ATE158859T1 (en) | 1997-10-15 |
DE69314329D1 (en) | 1997-11-06 |
FR2698957B1 (en) | 1995-02-03 |
WO1994012848A1 (en) | 1994-06-09 |
EP0630465B1 (en) | 1997-10-01 |
SG49870A1 (en) | 1998-06-15 |
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