FR2864220A1 - Hand grenade ignition cap has security pin and slider with screen that prevents accidental ignition - Google Patents

Abstract

An ignition cap (1) for a hand grenade (10), comprising a hollow body (4), a lever (20) with a spring strip (22) and a security pin (3), has an igniter (12) with a primer and an interrupter (7) that acts as a fire barrier in the storage position. The interrupter is in the form of a spring-loaded slider (70) of a metal such as zamac, with a fire-proof screen (72) and an aperture (73) that allows fire through when aligned with the primer. The security pin can only be removed after releasing a lock (6) and rotating the barrel (50) of the igniter.

Description

IGNITER CAP FOR HAND GRENADE AND HAND GRANADE EOUIPEE D'UN TEL

PLUG

  The present invention relates to an igniter plug for hand grenade comprising at least one hollow body of axis A, a release lever articulated with respect to the body and biased by at least one return blade between a secured position and a struck position, a security pin coupled to the release lever to lock in the secure position and at least one striker associated with said return blade. The invention also relates to a hand grenade equipped with an igniter plug as defined above.

  This type of igniter plug is commonly found on all hand grenades well known in the field of weapons. Once the safety pin is removed, the user must firmly hold the release lever against the grenade to prevent firing, which is triggered as soon as the release lever is released, also releasing the firing pin. This safety pin can be removed easily or even unexpectedly, for example in the event of a fall, which could even hurt the user of the hand grenade and / or those nearby. We search. today to reinforce the safety of the igniter plugs to avoid these risks of accident.

  Some solutions are to prevent the accidental removal of the safety pin as in US-A-3,865,027 and US-A-3,765,337. Other solutions include blocking the percussion mechanism as in the CH-Publications. A-466,094, US-A-1,521,996 and GBA-1,232,283. Still other solutions consist in off-centering the striker or primer with respect to the pyrotechnic chain, as in US-A-2,737,116. , US-A-4,730,559 and FR 2,825,462.

  The safety devices of the solutions mentioned above provide only one level of safety, which is clearly insufficient to avoid the risk of accidents. Only the security device described in the publication FR 2 825 462, of the same holder as the present invention, makes it possible to achieve three levels of security, hence optimal security for users of hand grenades. However, this solution does not meet certain security conditions stipulated in the US STANAG 4497 standard in force. Indeed, this standard requires that the firing of the hand grenade is controlled by two separate events and that the pyrotechnic chain is interrupted in the safety position or storage of the hand grenade provided with its lighter plug. By interruption of the pyrotechnic chain is meant a physical separation between the so-called primary and very sensitive components such as primers, igniters, detonators, etc. and so-called less sensitive secondary components such as relays, retarders, loads, etc. of this pyrotechnic chain. This constraint related to the interruption of the pyrotechnic chain is intended to prevent the accidental firing of the secondary components in the case where the primary components would be initiated while the hand grenade equipped with its igniter plug is in storage position or security.

  The present invention aims to solve this problem by proposing an igniter plug ensuring the interruption of the pyrotechnic chain and comprising a three-level safety device avoiding the accidental firing of the hand grenade, while allowing the reversibility of the device. safety, this igniter plug being of a simple, reliable and economical design.

  For this purpose, the invention relates to an igniter plug of the type indicated in the preamble, characterized in that the igniter plug comprises ignition means consisting of at least so-called primary components of the pyrotechnic chain and means for interrupting the ignition arranged to be movable between a storage position in which they form a fire barrier for preventing the passage of fire from the ignition means to said hand grenade and an ignition position in which said fire barrier is erased to allow the passage of fire from the ignition means to said hand grenade for its explosion.

  In a preferred embodiment of the invention, the ignition interruption means are arranged to cooperate with the release lever which keeps them in the storage position as long as it is in the secure position.

  These ignition interruption means advantageously comprise at least one return member arranged to move them from their storage position to their ignition position when the release lever leaves its secure position.

  In the preferred form, the means for interrupting the ignition comprise at least one slider movable transversely with respect to the body and provided with at least one fire screen forming the fire barrier in the storage position and a bore releasing a fire passage in the ignition position. The fire screen and the bore may be spaced apart by a distance substantially equal to the stroke between the two positions of the slide, this stroke being limited by a shoulder provided on said slide and adapted to cooperate with a wall of said body. .

  The body advantageously comprises a transverse housing and opening at least on the side of the release lever, this housing being arranged to guide in translation the slide having an outer end projecting from the trigger lever side.

  The body may further comprise a distal cavity disposed in the extension of the housing opposite the trigger lever and adapted to receive the return member cooperating with the inner end of the slide.

  The ignition interruption means may also comprise at least one sealing member disposed between the body and the slide.

  The slider is advantageously made of a fire-resistant material selected from the group comprising at least metals and metal alloys, this material may be for example Zamac. The thickness of the slide, especially in the area of the fire screen, is also chosen to withstand fire.

  The ignition interruption means are at least disposed downstream of the so-called primary components of the ignition means.

  In the preferred embodiment, the igniter plug comprises a hollow barrel of axis A housed inside the body and provided in the lower part with a nozzle intended to be attached to the hand grenade, the body and the barrel being movable in rotation relative to each other between a passive position in which the barrel prevents the withdrawal of the safety pin and an active position in which the barrel allows the removal of the safety pin.

  The barrel advantageously comprises a through bore of axis A adapted to receive the ignition means and a transverse recess arranged facing the housing traversed by said slider, this recess being arranged to allow and limit the relative rotation of the body relative to the barrel a predefined angle less than 90 and for example equal to 60.

  The barrel may comprise in the upper part at least one stop stop adapted to prevent the striker provided on the return blade to hit the ignition means when the barrel is in the passive position and at least one notch adapted to allow the percussion when the barrel is in the active position.

  The present invention and its advantages will become more apparent in the following description of an embodiment, given by way of non-limiting example, with reference to the accompanying drawings, in which: FIGS. 1A and 1B are axial sectional views of the closure igniter according to the invention, assembled to a hand grenade, in a secured position, respectively along the AA and BB cutting lines, FIG. 1B being enlarged, FIGS. 2A and 2B are views similar to those of FIGS. 1A and 1B, in the armed position, FIGS. 3A and 3B are cross-sectional views of the ignition plug along the section line CC of FIGS. 1 and 2, respectively illustrating the passive and active positions of the barrel corresponding to the secured and armed positions of the ignition plug, the FIG. 4 is a view similar to FIGS. 1A and 2A, while being struck, FIGS. 5A and 5B are cross-sectional views of the igniter plug along the axes DD respectively of FIG. 1A and 4, respectively illustrating the storage and ignition positions of the ignition interruption means, and FIGS. 6A and 6B are enlarged axial sectional views of the ignition plug of FIG. being withdrawn, respectively illustrating the locked and impacted positions of said igniter plug.

  Referring to the figures, the igniter plug 1 according to the invention is intended to equip a hand grenade 10 provided with at least one explosive charge 11. The ignition means 12 of the explosive charge 11, forming part of the pyrotechnic chain , are dissociated from the hand grenade 10 and housed in the igniter cap 1. The term "pyrotechnic chain" is the set of primary and secondary components ranging from the leader to the explosive charge. The objective of the invention is to centralize at least the so-called primary, highly sensitive components such as primers, igniters, etc. in the igniter plug 1 to have in the hand grenade 10 itself more than so-called secondary components therefore less sensitive as the powder of the explosive charge 11 and possibly one or more retarders, relays, amplifiers, etc.. Some secondary components such as relays and / or amplifiers may be housed in the igniter plug 1 in addition to the primary components of the ignition means 12, in particular to ensure the transmission or amplification of the ignition of the components between the igniter plug 1 and the hand grenade 10.

  The igniter plug 1 comprises a hollow body 4 of axis A capable of receiving said ignition means 12 consisting essentially of primary components, such as at least one or more primers, one or more igniters, etc., and possibly components. secondary, such as at least one or more relays, retarders, amplifiers, etc., these components being for example superimposed in a column. These ignition means 12 may comprise the same components as those equipping the current hand grenades 10. The igniter plug 1 comprises, in a known manner, a striker 2 intended to strike the top of the ignition means 12, for example its head primer, in order to initiate its ignition, this striker 2 being provided on a movable return blade 22 between a secure position and a percussive position, its secure position being locked by a safety pin 3 and / or provided by a trigger lever 20 held manually when the safety pin 3 is removed.

  This trigger lever 20, commonly called a spoon, has a substantially inverted-L shape, the small branch extending on top of the igniter plug 1 and the large branch extending on the side, extending along a part of the hand grenade 10. At the end of its small branch, the release lever 20 is articulated around a pivot 40 integral with the body 4 and biased essentially by pivoting the return blade 22, assisted by the slide 70 described below, if the safety pin 3 is removed and if it is not held manually against the hand grenade 10. This return blade 22 is disposed under the release lever 20, pivotally mounted around a axis 41 secured to the body 4, symmetrical to the pivot 40, and biased towards the release lever 20 by a helical spring (not shown) arranged around the axis 41.

  Striker 2 consists of a protruding and pointed element, obtained for example by cutting and folding an area of the return blade 22 or by any element attached to this return plate 22. It is positioned on this return blade 22 at a distance D from the axis 41 substantially equal to the distance d between this axis 41 of the axis A of the body 4 coincides with the axis of the hand grenade 10. This position allows it to be aligned with the means ignition 12 in the impact position.

  The safety pin 3 consists of a substantially U-shaped rod, the two parallel branches 30, 31 of the U being housed in orifices provided in the body 4 of the igniter plug 1, delimiting two parallel bores 42, 43 arranged on both sides of the return blade 22 (see Fig. 3A, 3B). The inner bore 42 receives the inner branch 30 of the safety pin 3 and the outer bore 43 receives its outer branch 31. Thus, the return blade 22 is locked by the outer branch 31 of the safety pin 3 positioned between this safety blade 22 and the trip lever 20. This safety pin 3 comprises, at the base of the U, a loop 32 arranged to receive a gripping ring 33. In the inert position, this gripping ring 33 can be immobilized in a recess (not shown) provided for this purpose in the body 4.

  This igniter plug 1 comprises a first safety mechanism 5 arranged to cooperate with the safety pin 3, this safety mechanism 5 being movable, by manual action, between at least one passive position in which it prevents the removal of the safety pin. 3 and an active position in which he authorizes it. It comprises a hollow barrel 50 traversed by a bore 52 of axis A adapted to receive the ignition means 12 and finished in the lower part by a nozzle 51 intended to be fastened integrally to said hand grenade 10, for example by screwing. This cylinder 50 is housed inside the body 4 by a relative degree of rotation between these two parts around the axis A. The barrel 50 has a peripheral groove 53 of semicircular section and disposed opposite the inner bore 42. This peripheral groove 53 comprises, in a predefined zone, a lateral recess 53a, forming a groove of oblong section (see FIG 3A, 3B). This lateral clearance 53a is arranged in such a way that in the active position of the barrel 50, it is aligned with the bottom of the internal bore 42 and releases the passage for the inner branch 30 of the safety pin 3. This inner branch 30 has, moreover, a recess 30a forming an abutment intended to be supported on the barrel 50 when it is in the passive position. Thus, the internal bore 42 provided in the body 4 is a bore of oblong section substantially equal to twice the diameter of the inner leg 30 of the safety pin 3 and the barrel 50 has a diameter such that in passive position it is protruding in this inner bore 42 and does not allow the removal of the safety pin 3 and in the active position it is flush with the bore 42 and allows the removal of the pin 3. This cylinder 50 also includes, in part upper, at least one and in the example two stop stops 58, 58 'successive able to stop the pivoting of the return blade 22 to prevent the striker 2 to hit the ignition means 12 when the barrel 50 is in passive position and at least one notch 59 adapted to allow percussion when the barrel 50 is in the active position. The first stop 58 'is a shoulder located on the path of the tail 22' of the return blade 22 and the second stop 58 is a shoulder located in the path of the return blade 22.

  The igniter plug 1 comprises a second safety mechanism called locking member 6 and arranged to cooperate with the safety mechanism 5. This locking member 6 is movable, by manual action, between at least two stable positions, a storage position in which it blocks the safety mechanism 5 in its passive position and an activation position in which it blocks the safety mechanism 5 in its active position, as well as an intermediate position in which it releases the safety mechanism 5 allowing it to to be maneuvered between his passive and active positions.

  This locking member 6 comprises a push button 60 housed in a blind bore 45 provided in the body 4, parallel to the axis A, at least one locking ball 61, housed in an orifice 46 provided in the body 4 and communicating with the blind bore 45 and the barrel 50, as well as at least one return element 62 arranged to urge the push button 60 out of its bore 45.

  This push button 60 is guided axially in the blind bore 45 of the body 4. It has at its free end a marker 67, for example red in color and in its non-free end an axial housing 63 for receiving the biasing element 62 in abutment against the bottom of the bore 45. This return element 62 consists of a compression spring or any other equivalent element symbolized in Figures 1B and 2B by its axis. In its middle part, this push button 60 comprises three peripheral zones of different diameters 64, 65, 66, intended to cooperate with the locking ball 61 to define the three positions of the locking member 6, corresponding to three output levels. of the push button 60 relative to said body 4. From top to bottom, with reference to FIGS. 1B and 2B, this pushbutton 60 has a zone of smaller diameter 64 corresponding to the intermediate position, delimited by the bottom of the blind bore 45 and in which the push button 60 is substantially flush with the body 4, a region of average diameter 65 corresponding to the storage position in which the push button 60 projects from about 2 to 3 mm from the body 4 (see FIG. and 1B) and a larger diameter area 66 corresponding to the activation position in which the push button 60 projects about 8 to 10 mm from the body 4 (see Figs 2, 4 and 6).

  The cylinder 50 has a first lateral hole 54 disposed opposite the orifice 46 of the body 4 and able to receive the locking ball 61, when it is in the passive position, which corresponds to the storage position of the pushbutton 60 ( see Figs lA and 1B). This cylinder 50 also has a second hole 55 lateral deeper than the first 54, intended to receive the locking ball 61 when it is in the active position, which corresponds to the activation position of the push button 60 (see fig. 2A and 2B). The two holes 54, 55 are distant from ut angle less than 90 and for example equal to 60. The passage from the passive position to the active position of the barrel 50 is obtained by a rotational movement of the body 4 relative to the barrel 50 about the axis A, exerted manually directly on the body 4 or by means of the grenade 10 on the barrel 50.

  The barrel 50 of the safety mechanism 5 also comprises a return element 56 coaxial with the axis A and arranged to urge the barrel 50 towards its passive position. This return element 56 consists of a spiral spring wound around the cylinder 50, one end of this spring being fixed to the body 4 and the other end to the cylinder 50. Its activation will be explained later with reference to the operation. Igniter plug 1.

  The igniter plug 1 according to the invention comprises a third safety mechanism called ignition interruption means 7 associated with the ignition means 12. These ignition interruption means 7 are arranged to be movable between a position storage in which they form a fire barrier to prevent the passage of fire from the ignition means 12 to the hand grenade 10 and an ignition position in which the fire barrier is erased to allow the passage of fire ignition means 12 to the hand grenade 10 to ignite the explosive charge 11 and detonate it.

  With particular reference to FIGS. 5A and 5B, the ignition interruption means 7 comprise a slider 70 arranged transversely in the body 4 of the igniter plug 1 along an axis B perpendicular to the axis A and provided with one end. outer member adapted to cooperate with the release lever 20 and an inner end coupled to a return member 71. This slider 70 is held in the retracted position corresponding to its storage position by the release lever 20 which bears directly on the outer end of the slider 70, as the trigger lever 20 is in the secured position obtained either by the safety pin 3 which locks both the return blade 22 and the release lever 20, or by manual pressure of the lever of trigger against the hand grenade 10 (Fig. 5A). This slider 70 moves along the axis B in its output position corresponding to its ignition position under the action of its return member 71 as soon as the release lever 20 leaves the secured position (FIG 5B). This slider 70 is provided with a fireproof screen 72 forming the fire barrier in the safety position and a bore 73 releasing a passage of fire in the ignition position. In this example, the spacing E separating the fireproof screen 72 and the bore 73 substantially corresponds to the stroke C of the slider 70 between its two positions, this stroke C being limited for example by a shoulder 75 arranged to abut against a wall 49 of the body 4 forming a stop in translation along the axis B. Other equivalent embodiments may also be suitable. It is guided through the body 4 by a transverse housing 47 opening on the side of the release lever 20 and through the barrel 50 by a recess 57 transverse. The body 4 also comprises a distal cavity 48 disposed in the extension of the housing 47 opposite the trigger lever 20 to receive the return member 73 consisting for example of a compression spring. For mounting purposes, this distal cavity 48 is delimited by a hollow cap 48 'attached to said body by screwing for example. The recess 57 provided in the barrel 50 is partially radially open to allow the relative rotation between the body 4 and the barrel 50 by limiting the angular deflection to a predefined angle a less than 90 and for example substantially equal to 60. Sealing members, for example in the form of an O-ring housed in a peripheral groove 74 between the housing 47 and the slider 70 and a washer 76 provided between the cavity 48 and the slider 70, may be provided for protect some of the components of the pyrotechnic chain from external aggressions, particularly moisture. The slide 70 is made of a fire-resistant material selected from the group comprising at least metals and metal alloys, such as for example steel, brass, Zamac, etc. This slide 70 must also have sufficient dimensions to resist fire and in particular a thickness adapted at least in the area of its fire screen, this thickness being for example equal to 4 mm, this dimension being in no way limiting . In the example shown, the slider 70 is disposed between the ignition means 12 and the nozzle 51, ie downstream of the primary components included in these ignition means 12 and upstream of the secondary components provided for in FIG. both in the tip 51 of the igniter cap 1 and in the hand grenade 10. This arrangement thus ensures the interruption of the pyrotechnic chain of the hand grenade 10 equipped with its ignition cap 1 in the secure position or storage.

  The operation of the igniter plug 1 of the invention is now described with reference to the figures.

  In the secured position (see Fig. 1A, 1B, 3A, 5A), the safety pin 3 housed in the body 4 of the igniter cap 1 locks the return blade 22 associated with the release lever 20. The cylinder 50 of the locking mechanism 5 is locked in the passive position by the push button 60 preventing the withdrawal of the safety pin 3 (FIG 3A). The locking ball 61 positioned between the region of average diameter 65 and the first hole 54 secures the cylinder 50 to the body 4 (FIG. 1B). The mark 67 of this push button 60 is visible and slightly projecting on the upper body 4 of the igniter cap 1. The slider 70 of the ignition interruption means 7 is locked in the retracted position corresponding to its storage position by the lever 20, the fire screen 72 being centered on the axis A (FIG 5A) to interrupt the pyrotechnic chain. In this configuration, the hand grenade 10 equipped with its lighter plug 1 is completely secure, can not be hit in any case even in case of mishandling or falling. In addition, the fire screen 72 prevents the firing of the hand grenade 10 even in case of inadvertent initiation of the ignition means 12.

  To bring the igniter plug 1 from its secure position illustrated in FIGS. 1A and 1B to the impacted position illustrated in FIG. 6B, the user of the hand grenade 10 must perform several deliberate, reflected and chronological manipulations.

  It must first bring the igniter plug 1 in the armed position shown in Figures 2A and 2B which will allow it to remove the safety pin 3 to reach the impacted position. To do this, he must unlock the cylinder 50 by pressing the push button 60 to bring it to its intermediate position, delimited by the bottom of the blind bore 45. In this intermediate position, the locking ball 61 retreats in its orifice 46 to fit in the free space provided between the smaller diameter zone 64 of the pushbutton 60 and the blind bore 45. Thus, the locking ball 61 out of the first hole 54 releasing the cylinder 50. The user must then turn the body 4 relative to the cylinder 50, or vice versa through the hand grenade 10, an angle substantially equal to 60 to bring the cylinder 50 in its active position (Figure 3B) delimited by the recess 57 provided in the barrel 50. With reference to FIGS. 3A and 5A, the arrow F shows the direction of rotation of the barrel 50 relative to the body 4. If the body 4 is rotated relative to the barrel 50, the direction of rotation is reversed. During this relative rotation, the push button 60 remains in its intermediate position, the locking ball 61 preventing its rise. As soon as the rotation is made, the second hole 55 of the barrel 50 is placed opposite the orifice 46 to receive the locking ball 61 which locks it in its active position. This second hole 55 being deeper than the first 54, the locking ball 61 penetrates further permitting the automatic raising of the push button 60 in its activation position under the action of its return element 62, the locking ball 61 being positioned between the larger diameter zone 66 and this hole 55. In this position, the marker 67 of the pushbutton 60 clearly protrudes from the top of the body 4, indicating that the igniter plug 1 is in the armed position (see FIG. , 2B, 4, 6B).

  If the user does not turn the barrel 50 sufficiently, ie angular stroke less than the angle α for example 60, the locking ball 61 can not be housed in the second hole 55 of the barrel 50 and block the latter in its active position. As a result, the barrel 50 automatically returns to its passive position under the effect of its spiral spring 56. Simultaneously, the push button 60 can not move into its activation position and then returns to its storage position relocating Igniter plug 1 in secure position (see Fig. 1A, 1B, 6A).

  When the igniter plug 1 is in the armed position as illustrated by FIGS. 2A, 2B, the user can either continue the process or return to the secure position as in FIGS. 1A, 1B by pressing the pushbutton 60 to allow the return automatic cylinder 50 in the passive position. To continue the process, he must remove the safety pin 3 by the gripping ring 33 with one hand while holding the release lever 20 against the hand grenade 10 with the other hand. In this position halfway between the armed position and the impacted position, the slide 70 is always returned guaranteeing the interruption of the pyrotechnic chain.

  As long as the user has not released the release lever 20, he can go back and replace the ignition cap 1 in the secure position, even after removing and discarding the safety pin 3. It suffices for it to push the push button 60 to release the barrel 50 allowing it to automatically return to its passive position under the action of its spiral spring 56. Thus, if the user releases the release lever 20, the striker 2 provided on the blade 22 will not be able to strike the head start of the ignition means 12, this return blade 22 being stopped in its movement by two stops 58, 58 'successive mechanical provided in the upper part of the barrel 50. So, even if the release of the trip lever 20 allows the slider 70 to be moved to the ignition position, the igniter plug 1 and the hand grenade 10 remain secure since the ignition means 12 can not be initiated (see Fig. 6A). This reversibility allows the user to replace its ignition plug 1 in the secure position (FIG 1A, 1B) by repositioning the release lever 20 and the return blade 22 in the inert position, causing the retraction of the slide 70 in the storage position , and locking this position by a safety pin 3.

  From the armed position, if the user wishes to continue the process and move into the impacted position, he must release the trigger lever 20 and throw the hand grenade 10 out of range that will explode within a predetermined period of time. By releasing the release lever 20, the return blade 22 pivots about its axis 41 under the action of its helical spring until it hits the head start of the ignition means 12 by means of its striker 2 (see Fig. 6B). In its rotation, it drives the trigger lever 20 which pivots about its axis 40. Simultaneously, the release lever 20 releases the slider 70 which automatically translates into the output position corresponding to its ignition position under the action of its organ spring 71 of a stroke C to present its bore 73 substantially in the axis A allowing the passage of fire ignition means 12 to the hand grenade 10 generating its firing. In its translation, the slide 70 contributes to the pivoting of the release lever 20.

  It can be seen from this description that the arming of a hand grenade 10 by means of the igniter plug 1 according to the invention becomes a totally thought-out and voluntary act and can not take place unexpectedly. Indeed, its firing can be initiated only by the combination of two independent events: the first event being the rotation of the barrel 50 after depression of the push button 60, and the second event being the release of the release lever 20 after withdrawal safety pin 3. Moreover, this igniter 1 plug ensuring the interruption of the pyrotechnic chain, allows to meet perfectly the standards in force. Finally, the igniter plug 1 according to the invention is designed to be easily reversible as long as the user has not released the release lever 20, to return the hand grenade 10 equipped with its igniter plug 1 in a completely secure position. In addition, the design of this igniter plug 1 has the advantage of being simple, reliable and economical.

  The present invention is not limited to the embodiment described but extends to any modification and variation obvious to a person skilled in the art while remaining within the scope of protection defined in the appended claims.

Claims (18)

claims   1. Ignition cap (1) for hand grenade (10) comprising at least one hollow body (4) of axis A, a release lever (20) hinged relative to the body (4) and biased by at least one blade restoring (22) between a secured position and a striking position, a safety pin (3) coupled to the release lever (20) to lock it in the secured position and at least one firing pin associated with said return blade (22) , characterized in that said igniter plug (1) comprises ignition means (12) consisting of at least so-called primary components and ignition interruption means (7) arranged to be movable between a storage position in which they form a fire barrier to prevent the passage of fire from the ignition means (12) to said hand grenade (10) and an ignition position in which said fire barrier is erased to allow passage of the ignition means (12) to said g hand-made (10) for its explosion.   2. Ignition cap according to claim 1, characterized in that said ignition interruption means (7) are arranged to cooperate with said release lever (20) which holds them in the storage position as long as it is in position. secure position.   3. Ignition cap according to claim 2, characterized in that said ignition interruption means (7) comprise at least one return member (71) arranged to move them from their storage position to their ignition position. when the release lever (20) leaves its safe position.   4. Ignition cap according to claim 3, characterized in that the ignition interruption means (7) comprise at least one slider (70) movable transversely relative to said body (4) and provided with at least one screen fire prevention device (72) forming said fire barrier in the storage position and a bore (73) releasing a fire passage in the ignition position.   5. Ignition cap according to claim 4, characterized in that the fire screen (72) and the bore (73) are spaced apart by a distance (E) substantially equal to the stroke (C) between the two positions. said slider (70).   6. Ignition cap according to claim 4, characterized in that said body (4) has a housing (47) transverse and opening at least on the side of the release lever (20), the housing (20) being arranged to guide in translation. said slider (70) having an outer end projecting from the side of said release lever (20).   7. Ignition cap according to claim 6, characterized in that said slide (70) comprises a shoulder (75) adapted to cooperate with a wall (49) of said body (4) to form a limit stop in translation limiting the stroke (C) said slider (70).   8. igniter cap according to claim 6, characterized in that said body (4) comprises a cavity (48) distal disposed in the extension of said housing (47) opposite the release lever (20) and adapted to receive said return member (71) cooperating with the inner end of said slider (70).   9. Ignition cap according to claim 6, characterized in that said ignition interruption means (7) comprise at least one sealing member (74, 76) disposed between said body (4) and said slider (70). ).   10. Ignition cap according to claim 4, characterized in that said slide (70) is made of a fire resistant material selected from the group comprising at least metals and metal alloys.   11. Ignition cap according to claim 10, characterized in that said slide (70) is made in part or in full Zamac.   12. Igniter plug according to claim 4, characterized in that the thickness of the slider (70) at least in the area of its fireproof screen is selected to withstand fire.   13. Igniter plug according to claim 1, characterized in that the ignition interruption means (7) are arranged downstream of the so-called primary components of said ignition means (12).   14. Ignition cap according to claim 1, characterized in that it comprises a cylinder (50) hollow axis A housed inside said body (4) and provided in the lower part of a tip (51) for to be attached to said hand grenade (10), the body (4) and the barrel (50) being rotatable relative to each other between a passive position in which the barrel (50) prevents the withdrawal of the safety pin (3) and an active position in which the barrel (50) allows the removal of the safety pin (3).   15. Ignition cap according to claims 6 and 14, characterized in that said barrel (50) has a bore (52) through which axis A adapted to receive said ignition means (12) and a transverse recess (57) arranged facing said housing (47) traversed by said slider (70), this recess (57) being arranged to allow and limit the relative rotation of said body (4) relative to said barrel (50) by a predefined angle.   16. Igniter plug according to claim 15, characterized in that the predefined angle is less than 90.   17. Ignition cap according to claim 14, characterized in that said barrel (50) comprises in the upper part at least one stop (58, 58) adapted to prevent the striker (2) provided on said return blade (22). ) hitting said ignition means (12) when the barrel (50) is in the passive position and at least one notch (59) adapted to allow percussion when the barrel (50) is in the active position.   18. Hand Grenade (10), characterized in that it is equipped with an igniter cap (1) according to any one of the preceding claims.