EP4176225A1 - Fusee comportant un dispositif d'autodestruction pour projectile giratoire - Google Patents
Fusee comportant un dispositif d'autodestruction pour projectile giratoireInfo
- Publication number
- EP4176225A1 EP4176225A1 EP21722465.8A EP21722465A EP4176225A1 EP 4176225 A1 EP4176225 A1 EP 4176225A1 EP 21722465 A EP21722465 A EP 21722465A EP 4176225 A1 EP4176225 A1 EP 4176225A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- projectile
- axis
- primer
- holder
- firing pin
- 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
- 238000010304 firing Methods 0.000 claims abstract description 94
- 230000007246 mechanism Effects 0.000 claims abstract description 78
- 238000003860 storage Methods 0.000 claims abstract description 64
- 230000000694 effects Effects 0.000 claims abstract description 33
- 230000001133 acceleration Effects 0.000 claims abstract description 27
- 230000009257 reactivity Effects 0.000 abstract description 4
- 238000009527 percussion Methods 0.000 description 9
- 239000002360 explosive Substances 0.000 description 5
- 230000000295 complement effect Effects 0.000 description 3
- 238000005474 detonation Methods 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C9/00—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition
- F42C9/14—Double fuzes; Multiple fuzes
- F42C9/16—Double fuzes; Multiple fuzes for self-destruction of ammunition
- F42C9/18—Double fuzes; Multiple fuzes for self-destruction of ammunition when the spin rate falls below a predetermined limit, e.g. a spring force being stronger than the locking action of a centrifugally-operated lock
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
- F42C15/18—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a carrier for an element of the pyrotechnic or explosive train is moved
- F42C15/188—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a carrier for an element of the pyrotechnic or explosive train is moved using a rotatable carrier
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
- F42C15/44—Arrangements for disarming, or for rendering harmless, fuzes after arming, e.g. after launch
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C9/00—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition
- F42C9/14—Double fuzes; Multiple fuzes
- F42C9/16—Double fuzes; Multiple fuzes for self-destruction of ammunition
Definitions
- the present invention relates to a rocket comprising a self-destruction device for a rotating projectile, said rocket consisting of a hollow body, defined by an axis of symmetry coincident with the axis of rotation of said projectile, and comprising a striker associated with a door -percuter, a primer associated with a primer holder, and a self-destruction device arranged to cooperate with said firing pin holder and said primer holder to successively generate a first position called “storage position” before firing the projectile, in in which the primer is misaligned with respect to the firing pin, a second position called “intermediate position” at the start of the shot, in which the firing pin holder is moved away from the primer holder, a third position called “armed position” during the flight of the projectile , in which the primer is aligned with the firing pin, and a fourth position called "self-destruction position” at the end of the flight, in which the firing pin holder is folded down on the primer holder so that the striker strikes
- the centrifugal force of the projectile can be used during firing to activate mechanical self-destruction devices, releasing the kinetic energy necessary for the percussion previously stored in a spring system, as in the publications EP2102581B1, EP1155279B1, EP1500902B1 and FR2489956B1.
- the fact of storing kinetic energy during the life of the projectile prior to firing (in the storage position) is a source of permanent danger for people and does not comply with current standards (STANAG 4187).
- some of these devices only operate at very high rotational speeds, for example 70,000 rpm, and are not suitable for lower speeds such as 15,000 rpm.
- the reliability and reproducibility of these devices are difficult to control.
- the acceleration of the projectile at the start of the shot can also be used to activate mechanical self-destruction devices, by storing the kinetic energy necessary for the percussion from the start of the shot, then the centrifugal force of the projectile during the shot to maintain the momentum.
- mechanical self-destruction devices by storing the kinetic energy necessary for the percussion from the start of the shot, then the centrifugal force of the projectile during the shot to maintain the momentum.
- STANAG 4187 Even if these self-destruction devices comply with the standards in force (STANAG 4187), they are less reactive in the event of direct impact, that is to say in normal operation of the rocket. Indeed, they do not have a direct impact function by deformation of the cap.
- the current self-destruction devices on this type of grenade are essentially pyrotechnic, as in the example of publication WO2005111533 A1.
- a pyrotechnic retardation is an element containing chemical substances, capable of detonating or deflagrating reaction following a mechanical initiation, often via a firing pin point.
- the pyrotechnic delay is characterized by a defined and non-modifiable duration between the instant of its initiation and that of the expected pyrotechnic reaction, often a detonation.
- the pyrotechnic delay begins the count and at the end of its duration detonates.
- the duration of the pyrotechnic delay is dimensioned so as to allow the projectile to reach a target at maximum distance.
- the detonation of the main charge of the projectile is initiated by the mechanical action of the impact of the rocket on a target. The projectile's self-destruction occurs when the target is missed and the impact does not generate a detonation of the main charge.
- the projectile falls to the ground and it is the pyrotechnic delay which initiates the main charge at the end of its duration.
- the duration defined by the pyrotechnic delay can be from several seconds to several tens of seconds depending on the models.
- the limit of this technology is the direct dependence between the self-destruction of the projectile and a duration defined by the pyrotechnic delay. This dependence reduces the reactivity of the self-destruction device and can endanger people. In fact, an ammunition that has fallen to the ground after a missed shot will explode a few seconds or a few tens of seconds after having stabilized on the ground, representing a danger for the user who would have progressed and reached the point of fall of the ammunition before the end of the pyrotechnic delay.
- the present invention aims to overcome these drawbacks by proposing a mechanical self-destruction device for a revolving projectile rocket, meeting the standards in force (STANAG 4187), independent of a duration, without energy storage prior to firing, reactive and flexible, that is to say suitable for all shooting situations, thus able to guarantee a very high level of safety for the user and those around him by eliminating the risk of an active projectile remaining on the ground.
- the invention further provides a self-destruct device of reliable design, reproducible, and capable of being superimposed or combined with other percussion means provided in the rocket to further increase its level of reliability.
- the invention relates to a rocket of the type indicated in the preamble, characterized in that said firing pin holder is movable in rotation about a balance axis perpendicular to said axis of symmetry, in that said primer holder is movable rotating around an axis of rotation parallel to said axis of symmetry, in that said self-destruction device comprises an AD mechanism and a safety mechanism arranged to cooperate, in that said AD mechanism comprises an axial inertial body urged by a return member and arranged to use the linear acceleration of the projectile at the start of the shot, to store axial kinetic energy and cause the passage from said storage position to said intermediate position in which said mechanism AD releases the firing pin holder so that it moves away from the primer holder), in that said safety mechanism comprises a centrifugal lever actuated by a member return and arranged to use the centrifugal effects of the projectile during flight, store radial kinetic energy and cause the passage from said intermediate position to said armed position in which said safety mechanism locks said AD mechanism
- This self-destruct device is its responsiveness. During an impact, regardless of the angle of impact, whether the impact is on a target or on the ground, the loss of rotational speed of the projectile is rapid. This sudden drop in rotational speed allows immediate triggering of the self-destruction device, that is to say without inertia, increasing the level of reliability and making it possible to achieve a very high level of safety for people.
- this self-destruction device which is sensitive to the loss of centrifugal effects, can be coupled to a ricochet-type firing system, sensitive to flight deceleration peaks, as well as to a device firing by deformation of the rocket fairing in the event of a direct impact, during "normal" operation of the rocket, thus allowing maximum reactivity for all scenarios encountered in the field of ballistics.
- the inertial body of said AD mechanism extends on an axis parallel to said axis of symmetry so that the balance axis of said firing pin holder is positioned between the two axes, said inertial body is mobile in its axis between an extended position in which it pushes the firing pin holder in the direction of the primer holder, and a retracted position in which it releases the firing pin holder, said extended position corresponding to the storage and self-destruction positions, and said retracted position corresponding to the intermediate and armed positions, said inertial body is arranged to move in a direction opposite to the direction of linear acceleration of the projectile from an extended position to a retracted position by compressing said return member to store energy axial kinetics at the start of the stroke, and said return member is arranged to move said inertial body in the opposite direction from a retracted position to an extended position in decomposition. taking precedence to restore said axial kinetic energy stored at the end of the shot.
- Said striker is advantageously carried at one end of said firing pin holder located opposite said inertial body with respect to said balance axis, and said primer holder advantageously comprises a housing remote from said primer, said housing being arranged to be aligned with said primer. striker in said storage and intermediate positions, so that in the storage position, said firing pin holder is folded towards said primer holder, and said firing pin enters said housing and blocks said primer holder.
- said self-destruction device further comprises an inertial mass mounted to pivot about said balance axis, consisting of a part separate from said firing pin holder, disposed between said inertial body and said firing pin holder and arranged to transmit to said door -percuter either the axial kinetic energy restored by said mechanism AD in said self-destruct position, or the own kinetic energy that said inertial mass itself has stored and that it restores in the event of strong linear deceleration of said projectile during 'an impact.
- an inertial mass mounted to pivot about said balance axis, consisting of a part separate from said firing pin holder, disposed between said inertial body and said firing pin holder and arranged to transmit to said door -percuter either the axial kinetic energy restored by said mechanism AD in said self-destruct position, or the own kinetic energy that said inertial mass itself has stored and that it restores in the event of strong linear deceleration of said projectile during 'an impact.
- the centrifugal lever of said safety mechanism is mounted to pivot about a pivot axis parallel to said axis of symmetry, between an unlocked position in which it releases the inertial body and a locked position in which it blocks the inertial body in a retracted position, the unlocked position corresponding to said storage and self-destruction positions, and the locked position corresponding to said armed position, said centrifugal lever is arranged to move radially in one direction of an unlocked position to a locked position under the centrifugal effects of the projectile by compressing said return member to store radial kinetic energy during flight, and said return member is arranged to move said centrifugal lever in the opposite direction from a locked position to a unlocked position by decompressing to restore said stored radial kinetic energy e at the end of firing when the centrifugal force is less than the elastic force of said return member.
- the centrifugal lever of said safety mechanism may advantageously comprise two segments arranged on either side of its pivot axis, a first segment capable of carrying a centrifugal mass, and a second segment forming a locking stop for locking the inertial body in a retracted position, the pivot axis being close to the axis of said inertial body so that the length of said first segment is greater than the length of said second segment.
- the return member of said safety mechanism may consist of a torsion spring mounted on a fixing stud with an axis parallel to said axis of symmetry, and provided with an end fixed relative to the body of said rocket, and d a movable end coupled to said centrifugal lever to urge it in the unlocked position.
- Said self-destruction device may further include a storage lever mounted to pivot about a pivot axis parallel to said axis of symmetry, between an active position in which it locks said centrifugal lever in an unlocked position corresponding to said storage position, and a passive position in which it moves away from said centrifugal lever when the latter moves into a locked position corresponding to said armed position.
- Said storage lever can advantageously comprise a locking tab arranged to lock said primer holder in a safety position corresponding to said storage position, when said storage lever is in an active position.
- Said storage lever and said centrifugal lever may respectively comprise self-locking means arranged to cooperate only when said storage lever is in an active position and said centrifugal lever is in an unlocked position.
- Said self-locking means may be provided respectively in an end zone of said storage lever opposite its pivot axis and in an end zone of said centrifugal lever opposite its pivot axis, and said control levers.
- storage and centrifuge can be arranged to pivot about their respective pivot axis in opposite directions of rotation under the effect of said centrifugal force of the projectile.
- Said self-locking means may include a locking tooth provided on one of the storage or centrifugal levers, and a locking notch provided on the other of the centrifugal or storage levers, the locking tooth being arranged to escape from the detent. locking when said centrifugal lever moves into a locked position, which is only possible in said armed position.
- the body of said rocket comprises an impact disc coaxial with the axis of symmetry, arranged between its top and the firing pin holder, and arranged to deform in the event of a direct impact of the firing pin. projectile on a target, and fold said firing pin holder on the primer holder to strike the primer.
- FIG. 1 is a perspective view of a projectile provided with a fuse according to the invention
- FIG. 2 is a perspective view in partial section of the rocket of the projectile of Figure 1, equipped with a self-destruction device according to the invention
- FIG. 3 is a perspective view of the main parts of the self-destruction mechanism alone equipping the rocket of Figure 2,
- FIG. 4 is an axial sectional view of an AD mechanism forming part of the self-destruction device of Figure 3, in the storage position,
- Figure 5 is a view similar to Figure 4 of the AD mechanism in an intermediate position
- Figure 6 is a view similar to Figure 4 of the AD mechanism in the armed position
- FIG. 7 is a top view of a safety mechanism forming part of the self-destruction device of Figure 3, in the storage position,
- Figure 8 is a view similar to Figure 7 of the safety mechanism in an intermediate position
- Figure 9 is a view similar to Figure 7 of the safety mechanism in the locked position
- Figure 10 is a view similar to Figure 7 of the safety mechanism in the unlocked position
- FIG. 11 is an axial sectional view of the self-destruction device of Figure 3 in the armed position
- FIG. 12 is a view similar to Figure 11 of the self-destruction device in the self-destruction position
- FIG. 13 is a perspective view of the primer holder and part of the self-destruction mechanism equipping the rocket of Figure 2, in the storage position,
- - Figure 14 is a view similar to Figure 13, in the armed position
- - Figure 15 is a view similar to Figure 13, in the self-destruct position.
- the invention is more particularly interested in gyrating grenades, which are projectiles 1 substantially in the form of a warhead, rotate on themselves about an axis of rotation coincident with the axis of symmetry A of the projectile. This rotation allows increased stability of the projectile in flight by gyroscopic effect.
- projectile is used which applies to all types of projectiles, ammunition, grenades, and the like.
- the projectile 1 shown in Figure 1 comprises from bottom to top, a cartridge 2 which contains a propellant charge, an ammunition body 3 which contains an explosive charge, and a fuze 4 which contains a firing pin 5 associated with a firing pin holder 14, a percussion primer 6 associated with a primer holder 60 and a self-destruction device 7.
- a cartridge 2 which contains a propellant charge
- an ammunition body 3 which contains an explosive charge
- a fuze 4 which contains a firing pin 5 associated with a firing pin holder 14, a percussion primer 6 associated with a primer holder 60 and a self-destruction device 7.
- the projectile 1 will not be described in more detail, since it is not the subject as such of the invention. In addition, it may have another composition or constitution than that described and illustrated in FIG. 1.
- the primer holder 60 will not be described in detail, since it is not the subject of the invention as a primer holder. such, and may have a different construction than that illustrated in Figures 13, 14 and 15.
- the primer holder 60 has a safety function which is ensured by maintaining mechanically misalign the primer 6 of the pyrotechnic chain.
- the axis of the pyrotechnic chain coincides with the axis of symmetry A or axis of rotation of the projectile 1.
- the invention relates more particularly to the rocket 4 and the self-destruction device 7 it contains.
- This fuse 4 can also be suitable for any type of rotating projectile. It is shown in partial section in Figure 2. It comprises a hollow body delimiting a closed interior volume, and consists of a substantially cylindrical base 8, and a substantially semi-spherical or warhead-shaped cap 9. The cover 9 is superimposed on the base 8 by means of an O-ring 10 (see axial section of the base 8 in Figures 11 and 12). The two parts 8 and 9 are assembled together by any compatible process, such as crimping, gluing, welding.
- the base 8 of the rocket 4 comprises at its center a through housing (not shown) to receive the upper part of the ammunition body 3 communicating with the primer 6 making it possible to initiate a pyrotechnic chain which will activate the explosive charges and cause the destruction of the projectile 1.
- the cap 9 of the fuze 4 comprises an impact disc 11, coaxial with the axis of symmetry A, placed in line with the striker 5 and the primer 6 when the device AD is in the armed position.
- the fairing 9 will deform, causing with it a deformation of the impact disc 11.
- This impact disc 11 is specially designed so that all possible deformations of the cap generate a sudden descent of the striker 5 in the direction of the primer 6.
- the impact disc 11 has a generally conical shape and always deforms so as to that its center collapses, presses on the striker 5, which strikes the primer 6, which initiates the pyrotechnic chain.
- the rocket 4 comprises a plate 12 perpendicular to the axis of symmetry A, delimiting in the internal volume of the rocket 4 an upper part, in which are housed the firing pin holder 14 and the self-destruction device 7, and a lower part in which are housed the primer holder 60 and its actuating mechanism.
- the self-destruction device 7 of the invention is designed to cooperate with the firing pin holder 14 and the primer holder 60 to place the projectile 1 in the following successive positions:
- the firing pin holder 14 is mounted to pivot about a balance axis 15 perpendicular to the axis of symmetry A of the rocket 4. It comprises at one end located on the side of the primer 6, the striker 5 in the form of a needle.
- the firing pin holder 14 can adopt successively:
- a storage position (fig. 2, 3, 13), corresponding to the storage position of the projectile 1, in which it is not subjected to any stress, it is lowered in the direction of the primer holder 60 and the tip of the firing pin 5 is received in accommodation 61 distant from the primer 6 to prevent the primer holder 60 from rotating and to keep the projectile 1 in a safe position,
- the firing pin holder 14 is associated with an inertial mass 16, which is mounted to pivot around the same balance pin 15, while constituting a mechanically distinct part. It has a U-shaped stirrup shape and is positioned below one end of the firing pin holder 14 opposite the firing pin 5.
- the inertial mass 16 and the firing pin 14 intersect at right angles. They can include complementary interlocking shapes to be linked together at least temporarily, especially in the percussion position. These complementary interlocking shapes can consist, for example, of an L-shaped end at the end of the firing pin holder 14 and of a U-shaped recess at the center of the inertial mass 16, without these examples being limiting.
- the center of gravity of inertial mass 16 is eccentric outside the balance axis 15, that is, away from the axis of symmetry A of the rocket 4.
- the inertial mass 16 which transmits to the firing pin holder 14 the energy necessary for the function AD when this energy is released. But it is also sensitive to the inertia of the projectile 1 to perform a so-called ricochet function, that is to say when the angle of impact of the projectile 1 is greater than 85 ° NATO (function sometimes called in English " Graze effect ”). Indeed, its shape and the position of its center of gravity make it extremely sensitive to the axial decelerations of the projectile 1. Its mass allows it to generate a level of energy sufficient to initiate the primer 6. Its role is to increase further. the reactivity of the self-destruction device 7 of the invention.
- the self-destruct device 7 is a mechanical device designed to use these two phenomena as sources of energy for its operation. It is activated from the start of the stroke and stores the energy necessary for the AD function. This energy, called kinetic energy, is stored mechanically at the start of the shot and is kept stored by the centrifugal effects throughout the flight of projectile 1. As soon as the speed of rotation of projectile 1 falls below a certain threshold, the effects Centrifuges are no longer sufficient to maintain the stored kinetic energy. Without the necessary centrifugal effects, the stored kinetic energy of self-destruction is then released and the explosive charge is initiated.
- the self-destruction device 7 comprises an AD mechanism 20 arranged to exploit the first phenomenon which is linear acceleration. It is designed to successively adopt:
- a storage position which corresponds to the storage position of the projectile 1, in which it keeps the firing pin holder 14 lowered and prevents the primer holder 60 from rotating, - an armed position, throughout the duration of the intermediate and armed positions of projectile 1, in which it stores kinetic energy under the effect of the linear acceleration of projectile 1 at the start of the shot, and allows the firing pin holder 14 to get up in the waiting position, and
- the self-destruction mechanism 7 further comprises a safety mechanism 30 arranged to exploit the second phenomenon which is angular acceleration. It is designed to successively adopt:
- the AD mechanism 20 comprises an inertial body 21, a return member 23, a sleeve 22 and a latch 24.
- the inertial body 21 extends axially on an axis B parallel to the 'axis of symmetry A of the rocket 4, below and in line with the inertial mass 16. In the example shown, it has a cylindrical shape, without this shape being limiting.
- the mass and the axial position of the inertial body 21 make it extremely sensitive to the axial acceleration of the projectile 1. Its mass also enables it to generate, in combination with the inertial mass 16, a level of energy sufficient to initiate the primer 6, as explained further away.
- the return member 24 is arranged coaxially with the axis B, between the inertial body 21 and the bottom of the blind bore 25. It may consist of a helical spring, without this example being limiting, and is arranged to secure the inertial body 21 upwards in the direction of the inertial mass 16.
- the lock 24 is in the example shown consisting of an elastic ring, trapped in an annular groove 26 formed in a middle zone of the inertial body 21.
- the sleeve 22 comprises in its internal geometry a compression ramp 27 followed by a notch d 'stop 28 cooperating with the lock 24 as explained below.
- FIGS. 4 to 6 show the kinematics of the AD 20 mechanism passing from a storage position (FIG. 4) to an armed position (FIG. 6) under the effect of the linear acceleration of the projectile 1 at the start of the shot.
- the storage position when the projectile 1 is at rest, the sleeve 22 is pressed into the blind bore 25 of the plate 12, the return member 23 is relaxed and the inertial body 21 protrudes from the plate 12 and in contact with the inertial mass 16, itself in contact with the firing pin holder 14 maintained in the lowered position.
- the linear acceleration of the projectile 1 in a direction represented by the arrow F instantly generates the axial displacement of the inertial body 21 in an opposite direction represented by the arrow G against the return member 23 (fig. 5).
- the inertial body 21 sinks into the sleeve 22, compressing the return member 23 which stores kinetic energy until it reaches the armed position (FIG. 6).
- the return member 23 In the armed position, the return member 23 is compressed to its maximum and constitutes a reserve of kinetic energy capable of ensuring the AD function of the self-destruction device 7.
- the lock 24 on board with the inertial body 21 descends along the inner wall of the sleeve 22, when passing the compression ramp 27 compresses (fig.
- the inertial body 21 and the sleeve 22 are then intimately linked by the latch 24 and form an inseparable whole.
- the inseparable assembly "inertial body 21 and sleeve 22" will rise again under the effect of the return member 23, as explained with reference to FIG. 12.
- the sleeve 22 and the lock 24 are not essential, but form a security additional.
- the fact of separating these two parts: the inertial body 21 and the socket 22, allows the self-destruction device 7 to guarantee both that no energy is stored in the rocket 4 before the start of the shot but also that the AD mechanism 20 is always locked by the locking lever 31 described below, regardless of the firing situation.
- the protruding position of the inertial body 21 prevents the locking lever 31 from rotating (Figs. 3 and 4).
- Angular acceleration has no effect on the locking lever 31 until the inertial body 21 has sunk into the socket 22 under the effect of the linear acceleration at the start of the stroke.
- This security requires a combination of the two ballistic phenomena simultaneously to be lifted: linear acceleration for the inertial body 21 and centrifugal effect for the locking lever 31.
- the safety mechanism 30 comprises a locking lever 31, a centrifugal mass 32 and a return member 33.
- the locking lever 31 is a flat part which is elongated in a plane. perpendicular to the axis of symmetry A of the rocket 4. It is mounted to pivot about a pivot axis C parallel and remote from the axis of symmetry A, arranged in the environment close to the mechanism AD 20. It has two segments arranged on either side of its pivot axis C: a first segment 31a which carries at its end the centrifugal mass 32 and a second segment 31b which forms a locking stop by being superimposed above the inertial body 21 of the AD 20 mechanism when it is in the armed position (fig. 6).
- the length of the first segment 3 la is greater than the length of the second segment 3 lb, to increase the lever arm on the side of the centrifugal mass 32.
- the centrifugal mass 32 has a cylindrical shape of axis D, without this shape being limiting. Its shape, its mass and its position far from the axis of symmetry At the make it particularly sensitive to the centrifugal force of the projectile 1.
- the return member 33 is in the example shown consisting of a torsion spring, the central part 33a of which is mounted on a stud 34 fixed on the plate 12, forming with the pivot axis C of the locking lever 31 and the axis D of the centrifugal mass 32 a triangle.
- One of the end branches 33b of the return member 33 is fixed to the plate 12 and the other end branch 33c is coupled to the centrifugal mass 32. It comprises for this purpose an annular groove 35 in which the branch end 33c is in sliding contact. The function of this return member 33 is to urge the locking lever 31 into the unlocked position (FIGS. 10 and 12).
- Figures 7 to 9 illustrate the kinematics of the safety mechanism 30 passing from a storage position (fig. 7) to a locked position (fig. 8 and 9) under the effect of the centrifugal force induced by the angular acceleration. of projectile 1 at the start of the shot.
- the angular position of the locking lever 31 is such that its end forming the locking stop 3 lb is located outside the inertial body 21 of the AD mechanism 20, and that the centrifugal mass 32 which it carries at its other end is brought closer to the axis of symmetry A, and the return member 33 is prestressed.
- the locking stop 3 lb opposite the centrifugal mass 32, moves in the same direction S above the inertial body 21 of the AD mechanism 20, if and only if said inertial body 21 has meanwhile passed into the armed position (FIG. 6). If the locking lever 31 has been able to move, it blocks and maintains the mechanism AD 20 in the armed position for the duration of the flight of the projectile and as long as the speed of rotation of the projectile 1 is sufficient. During this movement, the return member 33 is compressed and stores a reserve of kinetic energy capable of ensuring the return of the locking lever 31 to the unlocked position (fig. 10), to release the self-destruction function of the AD mechanism 20 (fig. 12).
- the rotation of the locking lever 31 is only possible if the inertial body 21 is erased in the armed position. Indeed, if the inertial body 21 has not undergone the effects of linear acceleration of the projectile 1, it prevents any rotation of the centrifugal lever 31. This condition makes it possible to guarantee that without the existence of an event which combines linear acceleration and angular acceleration, the projectile 1 is maintained in a state of maximum security.
- the locking lever 31 via the storage lever 37 described below in fact makes it possible to block the rotation of the primer holder 60 and makes it impossible to potentially align the primer 6 with the pyrotechnic chain.
- the safety mechanism 30 further comprises a storage lever 37 pivotally mounted about a pivot axis E parallel to the axis of symmetry A of the spindle 4, and substantially diametrically opposite to the pivot axis C of the control lever. locking 31. It is designed to adopt successively:
- the storage lever 37 has at its free end a locking notch 38 arranged to receive a locking tooth 39 of complementary shape provided on the locking lever 31.
- the locking tooth 39 projects radially from the end of the locking lever.
- locking 31 carrying the centrifugal mass 32.
- It further comprises a locking tab 40, opposite the locking notch 38, which extends in the direction of the primer holder 60 to be housed in a locking notch 64 of the mechanism actuation of the primer holder 60 described below.
- the active position (fig. 7)
- the locking lever 31 and the storage lever 37 are intimately linked by the locking tooth 39 nested in the locking notch 38, thus forming self-locking means guaranteeing both the secure maintenance. of the self-destruction device 7 and the safe maintenance of the primer holder 60, in the storage position of the projectile 1 during all the phases preceding the start of the shot.
- FIGS. 11 and 12 represent in axial section the self-destruction device 7 respectively in the armed position and in the self-destruction position.
- the centrifugal effects linked to its rotation keep the locking lever 31 in the locked position (FIG. 11). In this position, it maintains the inseparable assembly formed by the inertial body 21 and the sleeve 22 in the armed position, preventing it from rising.
- the locking lever 31 which retains the self-destruction device 7 while maintaining the centrifugal effects.
- the projectile 1 undergoes a loss of rotational speed, the centrifugal effects then decrease very quickly until they disappear completely.
- the centrifugal force is no longer sufficient to keep the return member 33 compressed.
- the triggering threshold is determined by the elastic force. of said return member 33.
- the centrifugal mass 31 is then pushed towards the inside of the rocket 4 by the return member 33. It drives with it the locking lever 31 in rotation about its pivot axis C in the direction inverse represented by the arrow S '.
- the locking stop 3 lb then releases the AD mechanism 20, and the safety mechanism 30 is in the unlocked position (fig. 10).
- the inseparable assembly formed by the inertial body 21 and the sleeve 22 can rise again under the effect of the return member 23 which releases the stored kinetic energy. at the start of the blow.
- the “inertial body 21 and sleeve 22” assembly moves upwards in the direction of arrow G ', and drives the inertial mass 16 which in turn rises by rocking around the axis of the balance 15 (FIG. 12). ).
- the inertial mass 16 comes into contact with the firing pin holder 14 which also swings around the balance axis 15, and drives the firing pin 5 with it down.
- the striker 5 strikes the primer 6 which initiates the pyrotechnic chain activating the explosive charge of the projectile 1.
- the projectile 1 is then destroyed by the self-destruction device 1 as soon as the speed of rotation drops below a certain threshold.
- FIGS. 13 to 14 illustrate the primer holder 60 associated with its actuation mechanism in its different positions relative to the successive positions of the firing pin holder 14: the storage position (FIGS. 3, 4, 11 and 13) in which the primer holder 60 is in the safety position, the primer 6 is eccentric with respect to the striker 5, the firing pin holder 14 is lowered and the tip of the striker 5 is received in the housing 61 of the primer holder 60 for the prevent turning, the standby position (Figs. 11 and 14) in which the firing pin holder 14 is raised, the firing pin 5 releases the primer holder 60, and the primer holder 60 has rotated and is in a cocked position in which the primer holder 60 has rotated and is in an armed position.
- primer 6 is aligned with the firing pin 5, and the percussion position (fig. 12 and 15) in which the firing pin holder 14 is lowered towards the primer holder 60, the firing pin hits the primer 6 to initiate the pyrotechnic chain .
- the primer holder 60 is movable in rotation around an axis of rotation P parallel and distant from the axis of symmetry A. It is associated with an actuation mechanism which comprises at least a pair of inertial bolts 62, a segment motor 63 and a chronometer train 65.
- the primer holder 60 is mechanically independent of the motor segment 63, which allows the projectile 1 to remain in safety over a defined safety distance.
- the couple of inertial locks 62 constitutes a safety for the actuation mechanism, which reacts only to the linear acceleration alone of the projectile 1. Thus, it blocks the rotation of the motor segment 63 and of the primer holder 60 as long as the shooting was not carried out.
- the motor segment 63 is an eccentric mass which reacts strongly to centrifugal effects. When it is subjected to the centrifugal effects of the projectile 1 after the start of the shot, it begins a rotation around its axis of rotation P. This rotation is subject to the fact that the storage lever 37 of the self-destruction device 7 has moved to passive position (fig. 9 and 10) and that the locking tab 40 has moved away from the locking notch 64 provided on the motor segment 63.
- the speed of rotation of the motor segment 63 is regulated by a set of train d 'gears or chronometer train 65. The rotational stroke of the motor segment 63 takes place in two parts. A first so-called “regulated” part in which the motor segment 63 drives the chronometer train 65 over the defined safety distance.
- the primer holder 60 does not move and the primer 6 remains in the safety position in which it is offset. And a second part called “instantaneous" which begins the second when the last tooth of the motor segment 63 stalls from the chronometer train 65. At this instant, the defined safety distance is exceeded, the motor segment 63 is no longer braked and can end its race almost instantaneously. It takes the primer holder 60 with it and instantly aligns the primer 6 in the axis of symmetry A.
- the operation of the actuating mechanism associated with the primer holder 60 is simple and the self-destruction device 7 according to the invention helps to keep this mechanism safe.
- the present invention is of course not limited to the exemplary embodiment described but extends to any modification and variant obvious to a person skilled in the art within the limits of the appended claims.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
- Toys (AREA)
- Fuses (AREA)
- Air Bags (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR2006757A FR3112202B1 (fr) | 2020-07-02 | 2020-07-02 | Fusee comportant un dispositif d'autodestruction pour projectile giratoire |
PCT/EP2021/061384 WO2022002462A1 (fr) | 2020-07-02 | 2021-04-30 | Fusee comportant un dispositif d'autodestruction pour projectile giratoire |
Publications (3)
Publication Number | Publication Date |
---|---|
EP4176225A1 true EP4176225A1 (fr) | 2023-05-10 |
EP4176225B1 EP4176225B1 (fr) | 2024-06-19 |
EP4176225C0 EP4176225C0 (fr) | 2024-06-19 |
Family
ID=73698910
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21722465.8A Active EP4176225B1 (fr) | 2020-07-02 | 2021-04-30 | Fusee comportant un dispositif d'autodestruction pour projectile giratoire |
Country Status (12)
Country | Link |
---|---|
US (1) | US11933594B2 (fr) |
EP (1) | EP4176225B1 (fr) |
KR (1) | KR20230033006A (fr) |
BR (1) | BR112022021628A2 (fr) |
CO (1) | CO2022015087A2 (fr) |
FR (1) | FR3112202B1 (fr) |
IL (1) | IL297506A (fr) |
MX (1) | MX2022013166A (fr) |
PL (1) | PL4176225T3 (fr) |
SA (1) | SA522441097B1 (fr) |
WO (1) | WO2022002462A1 (fr) |
ZA (1) | ZA202211115B (fr) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3985079A (en) * | 1975-10-20 | 1976-10-12 | The United States Of America As Represented By The Secretary Of The Army | Self-destruct fuze for spinning artillery projectile |
FR2364429A1 (fr) * | 1976-09-13 | 1978-04-07 | Haut Rhin Manufacture Machines | Dispositif mecanique d'autodestruction pour projectile giratoire |
FR2489956B1 (fr) * | 1980-09-09 | 1986-07-11 | Haut Rhin Sa Manuf Machines | Dispositif d'autodestruction pour fusee equipant un projectile giratoire |
SG93195A1 (en) | 1999-02-04 | 2002-12-17 | Chartered Ammunition Ind Ptee | Self destructing impact fuse |
DE60301401T2 (de) | 2003-06-24 | 2006-06-22 | Dixi Microtechniques S.A.S. | Selbst-Zerlegerzünder für drallstabilisierte Geschosse |
BE1016094A3 (fr) | 2004-05-14 | 2006-03-07 | Zeebrugge Forges Sa | Dispositif d'autodestruction pour fusee de sous-munition. |
WO2007137444A1 (fr) | 2006-05-31 | 2007-12-06 | Micro Technology Heremence Sa | Fusee a impact avec dispositif d'autodestruction |
US8037826B2 (en) * | 2006-06-01 | 2011-10-18 | Dse, Inc. | Mechanical self destruct for runaway escapements |
SG144000A1 (en) | 2006-12-28 | 2008-07-29 | Advanced Material Engineering | Self destructing impact fuze |
DE102008053990B4 (de) * | 2008-10-30 | 2010-07-22 | Junghans Microtec Gmbh | Zünder für ein Geschoss |
DE102013000050B3 (de) | 2013-01-07 | 2014-01-30 | Rheinmetall Waffe Munition Gmbh | Selbstzerlegungsmechanimus für einen Zünder |
-
2020
- 2020-07-02 FR FR2006757A patent/FR3112202B1/fr active Active
-
2021
- 2021-04-30 US US17/917,784 patent/US11933594B2/en active Active
- 2021-04-30 WO PCT/EP2021/061384 patent/WO2022002462A1/fr active Application Filing
- 2021-04-30 BR BR112022021628A patent/BR112022021628A2/pt unknown
- 2021-04-30 IL IL297506A patent/IL297506A/en unknown
- 2021-04-30 PL PL21722465.8T patent/PL4176225T3/pl unknown
- 2021-04-30 EP EP21722465.8A patent/EP4176225B1/fr active Active
- 2021-04-30 MX MX2022013166A patent/MX2022013166A/es unknown
- 2021-04-30 KR KR1020227036754A patent/KR20230033006A/ko unknown
-
2022
- 2022-10-11 ZA ZA2022/11115A patent/ZA202211115B/en unknown
- 2022-10-24 CO CONC2022/0015087A patent/CO2022015087A2/es unknown
- 2022-10-27 SA SA522441097A patent/SA522441097B1/ar unknown
Also Published As
Publication number | Publication date |
---|---|
IL297506A (en) | 2022-12-01 |
CO2022015087A2 (es) | 2022-11-08 |
EP4176225B1 (fr) | 2024-06-19 |
US20230133860A1 (en) | 2023-05-04 |
FR3112202A1 (fr) | 2022-01-07 |
EP4176225C0 (fr) | 2024-06-19 |
FR3112202B1 (fr) | 2022-07-01 |
PL4176225T3 (pl) | 2024-08-05 |
US11933594B2 (en) | 2024-03-19 |
BR112022021628A2 (pt) | 2023-01-10 |
MX2022013166A (es) | 2022-11-30 |
KR20230033006A (ko) | 2023-03-07 |
WO2022002462A1 (fr) | 2022-01-06 |
ZA202211115B (en) | 2024-01-31 |
SA522441097B1 (ar) | 2023-10-12 |
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