EP0318995B1 - Pyrotechnical initiator for projectiles - Google Patents

Description

The invention relates to a pyrotechnic self-dismantling device for projectiles, rockets, bomblets and mines according to the preamble of claim 1.

A pyrotechnic self-dismantling device for projectiles, missiles, bomblets and mines is known from EP-A-0 256 320. It has an ignition device for a pyrotechnic delay device in a housing. The delay device is arranged in a slide which is mounted so that it can move transversely in the housing, this slide being extendable via a lateral opening on the housing via the outer housing contour. The delay device consists of an ignition charge, a delay charge and a detonator for igniting an explosive charge. On the other hand, the detonator can be triggered by a firing pin that can be actuated when the ammunition strikes. A firing needle, which is biased by a spring, is mounted in the slide to ignite the deceleration rate. If the delay set is fired outside of the rule, the detonator is inevitably initiated. There is a risk that the explosive charge will be detonated. However, this risk should be excluded.

Accordingly, the invention is based on the object of proposing a pyrotechnic self-dismantling device in which it is ensured that a delay block ignited outside the rule in safety does not initiate the detonator provided for detonating the explosive charge.

This object is achieved in accordance with the features of claim 1. Advantageous developments of the invention emerge from the subclaims.

The advantages of the invention are explained using two exemplary embodiments shown in the drawing.

Fig. 1

einen Ausschnitt aus einem pyrotechnischen Zünder für ein Bomblet;

Fig. 2

einen Schnitt II-II nach Fig. 1;

Fig. 3

den Zünder nach Fig. 2 in Scharfstellung;

Ein Bomblet 1 mit einer Übertragungsladung 2 und einer Sprengladung 3 trägt ein Gehäuse 4 eines pyrotechnischen Zünders 5. Ein Mantel 6 mit einer Öffnung 7 für einen Schieber 8 verbindet das Gehäuse 4 mit dem Bomblet 1.It shows:

Fig. 1

a section of a pyrotechnic detonator for a bomblet;

Fig. 2

a section II-II of FIG. 1;

Fig. 3

the igniter of Figure 2 in focus.

A bomblet 1 with a transfer charge 2 and an explosive charge 3 carries a housing 4 of a pyrotechnic detonator 5. A jacket 6 with an opening 7 for a slide 8 connects the housing 4 to the bomblet 1.

A firing pin 15 engages securely in a bore 16 of the slide 8. A detonator 17 and a sheet 18 with an ignition needle 19 are crimped in the slide 8.

A delay detonator 25 has:
A tube 26 with the sections 27 and 28, an ignition set 29, a delay set 30 and a transmission set 31.
2, the latter lies outside the response range 32 of the detonator 17.

The tube 26 is slidably mounted in a slide guide 34. A ball 35 is mounted in an opening 36 of the slide 8 while the slide 8 is secured. The ball 35 is supported on the slide guide 34 and rests on a shoulder 37 of the delay detonator 25. When the slide 8 is in focus, the opening 36 is outside the housing 4. The slide 8 is provided with a spring 40.

The slide 8 has a center of gravity 9 at a distance 10 from the main axis 11.

The bomblet 1 ejected from a swirl projectile also has a corresponding swirl. A stabilizing parachute lifts the firing pin 15 out of the bore 16 in a known manner. Then the centrifugal forces generated by the swirl and acting on the slide 8, supported by the spring 40, move the slide 8 into the focus shown in FIG. 3. As soon as the opening 36 lies outside the jacket 6, the ball 35 is thrown out of the opening 36 and has thus released the delay detonator 25. This strikes against the sheet 18 due to the inertial forces, whereby the firing needle 19 initiates the ignition charge 29. It is essential that the slide 8 initially only transports the delay detonator 25 until the stop 21 hits the stop 20 of the housing 4 in its movement phase. The delay detonator 25 is unlocked. As a result of the impact, the inertial forces act solely on the delay detonator 25 and move it up to the sheet metal 18. After the firing time of the delay set 30, the transmission set 31 immediately adjacent to the detonator 17 ignites the detonator 17 in accordance with the arrow 44. This then initiates the explosive charge 3 via the transfer charge 2. In the focus (Fig. 3), the slide 8 is secured in a known manner.

The functional sequence described takes place only on the condition that the bomblet 1 hits soft ground, so that there was no corresponding pulse for the firing pin 15.

The telescopability of the delay detonator allows a relatively large overall length, which is only limited by the run-up section 50 between the firing needle 19 and the primer. In addition, there is also a safety distance, which is defined as the response area 32. Therefore, if the delay detonator 25 is fired in a safe manner outside the rule, it is ensured that the detonator 17 is not initiated due to the spatial separation.

The hot gases and particles of the transmission set 31 are discharged into relaxation rooms (not shown) of the pyrotechnic igniter 5.
Despite the fact that the delay detonator 25 can be telescoped, it is ensured in the focus that the transmission set 31 is in the immediate vicinity of the detonator 17. The transmission set 31 penetrates the section 28, the wall 33 and the detonator cup 38.

In the case of a bomblet without swirl, a spring 12 effects or supports the setting of the delay detonator 25.

Claims (5)

1. A pyrotechnical self-destruction mechanism for projectiles, rockets, bomblets (1) and mines, which has in a housing (4) an ignition device for a pyrotechnical delayed-action mechanism (25), consisting of a firing composition (29) and a delayed-action composition (30), a detonator (17) for the detonation of an explosive charge (3) and a firing pin (15) for the detonator (17), in which respect the detonator (17) is arranged in a transversely movable slider (8) and the housing (4) has a lateral aperture (7) for the slider (8; 68) which can be run out beyond the outer housing contour (jacket 6) and which contains the delayed-action mechanism (25; 60), the delayed-action mechanism (25) is displaceably mounted so as to be longitudinally movable in the slider (8), is secured by way of a safety device (34-37) in the slider (8) and is unlocked only in the armed position of the slider (8), in which respect the slider (8) has a stationary firing needle (19) for igniting the displaceable delayed-action mechanism (25).
2. A pyrotechnical self-destruction fuze according to claim 1, characterised in that the safety device of the delayed-action mechanism (25) is a ball safety device, in which respect the ball (35) in the safe position of the slider (8) is mounted in an aperture (36) of the slider (8) between a shoulder (37) of the delayed-action mechanism (25) and a slider guide (34) of the housing (4), in which respect the aperture (36) lies close to the jacket (6).
3. A pyrotechnical self-destruction fuze according to claim 1, characterised in that a transmission composition (31), a delayed-action composition (30) and a detonation firing composition (29) are arranged in a tube (26), in which respect the transmission composition (31) in the safe position lies outside the response region (33) of the detonator (17).
4. A pyrotechnical self-destruction fuze according to claim 1, characterised in that the slider (8; 68) is secured in a form-locking manner by spring force (40) or by centrifugal forces in known "per se" manner in the safe position by a striker pin (15) mounted in the main axis of the fuse and the slider (8; 68) after the unlocking thereof is movable out of the safe position into the armed setting (72).
5. A pyrotechnical self-destruction fuze according to claim 1, characterised in that in the armed position of the slider (8) the stops (20, 21) butt against one another.

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