Pyrotechnical impact detonator

Details Pyrotechnical impact detonator Pyrotechnical impact detonator

1998-10-26

2001-07-10

Jordan, Charles T. (Department: 3643)

Ammunition and explosives

Igniting devices and systems

Percussion primers or ignitors

C102S272000, C102S265000, C102S266000

Reexamination Certificate

active

06257145

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to an impact detonator for a projectile for the detonation of an active mass upon impact against an obstacle.
The known impact detonators have a high danger potential, mainly due to the possibility of the existence of a dud. This is because, especially upon impact on soft ground, if there is no detonation of the active mass, then a dud will exist, of which the active mass is basically still ignitable.
For the reduction of this danger potential of these conventional impact detonators, the use of self-disintegrating devices connected in parallel are known, while, however, these cannot eliminate any residual risk.
Of course, the danger potential of known impact detonators can be avoided by relinquishing their use entirely and instead using pyrotechnical detonation delay devices. While this has the advantage that potential duds pose no direct danger, since, with the extinguishing of the detonation delay devices, no active detonation element is available. While, however, also the disadvantage exists that the initialization of the active charge appears only upon passing of the delay period, and not already upon impact against the ground.
SUMMARY OF THE INVENTION
It is thus the object of the present invention to develop the known impact detonator such that, upon impact against an obstacle, a detonating function is introduced with a simultaneous avoidance of a danger in handling the corresponding projectiles, such as during manufacture, assembly or disassembly and/or defusing, especially in the case of duds.
According to the invention, the problem is solved through the use of a detonation chain which comprises a pyrotechnical detonation means, wherein the pyrotechnical mass and the pyrotechnical detonation means, as movable with respect to one another, are held spacially separated from one another, at least prior to the impact of the projectile against an obstacle, and can move towards one another upon impact of the projectile against an obstacle for the detonation of the active mass.
In so doing, it can be provided that the pyrotechnical mass is an ignition charge, such as Si/Pb
3
O
4
or the like.
An embodiment of the invention is characterized in that a first delay piece is connected to the pyrotechnical mass, especially if the projectile can be detonated upon discharge.
Further, according to the invention, it is suggested that the pyrotechnical mass or the first delay piece can be detonated either electrically, such as using a detonation initiator, a detonator or the like, or pyrotechnically, such as using a propelling charge swath of gun powder or the like upon discharge or ejection of the projectile.
It can be provided that the pyrotechnical detonation means comprise the active mass or a second detonation charge and the active mass.
Preferred, according to the invention, is that the pyrotechnical mass is held apart from the pyrotechnical detonation means by a frictional retaining force which allows for a relative movement only upon application of a certain pressure from the mass.
Equally preferred is that the movable storage of the pyrotechnical mass with respect to the pyrotechnical detonation means comprises a design memory element or a fuse which allows for a relative movement only upon supply of a certain amount of heat.
The holding of the pyrotechnical mass can be achieved by shear pins.
A further embodiment of the invention is characterized by a second delay piece, after the delay period of which the self-destruction of the projectile is introduced.
In so doing, the invention suggests that the delay period of the second delay piece be longer that the delay period of the first delay piece.
According to the invention, it can be provided that a second delay piece of the pyrotechnical mass is connected in the detonation chain or is added in parallel.
Finally, it is suggested further that the first and/or second delay piece represents a mechanical or electronic time-delay fuse.
Thus, the basis of the invention is the surprising recognition that a pyrotechnical impact detonator has a pyrotechnical mass which, for example, upon discharge of the projectile or upon ejection of a projectile's internal structure is detonated and made to spark, optionally also after a defined period of delay, and, in the case of the normal operation through the shock of the impact from a position fixed until then, is moved in the direction of a detonation means which, in regard to the detonation chain, is located behind it, detonates it and thus triggers the function of the projectile, or in the case of a dud finishes sparking in said position, such that the detonation chain to the active mass, due to the failure of a connecting part cannot be put into operation by itself, that is, the dud can be, for example, buried in a safe condition. According to the invention, the pyrotechnical mass can be installed tightly in one location, while the detonation means is stored as movable.
Furthermore, according to the invention, mechanical or electronic time-delay fuses can, according to the invention, be provided in a pyrotechnical impact detonator which guarantees a outstripping safety, detonates the pyrotechnical mass as well as keep it ready for impact function over a certain period of time and/or induce self-destruction.
A pyrotechnical impact detonator, according to the invention, can be employed in a variety of ways, for example, in a bomblet projectile, a mortar shell or practice ammunition of any caliber.


REFERENCES:
patent: 415719 (1889-11-01), Langfitt
patent: 1221454 (1917-04-01), Keller
patent: 2462305 (1949-02-01), Catlin
patent: 2627810 (1953-02-01), Catlin

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