Ammunition and explosives – Smoke generating
Reexamination Certificate
1999-08-17
2001-08-07
Tudor, Harold J. (Department: 3641)
Ammunition and explosives
Smoke generating
C102S347000, C102S498000, C102S513000
Reexamination Certificate
active
06269747
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a training rocket for smoke development, comprising a forward training head, which head contains a smoke composition and is adapted to emit visible smoke upon impact. Such rockets are used for practice firing, in order to mark the point of impact, whereby the point can be observed by the gunner from the firing site. The training head is mounted foremost on a rocket tube which contains propellant powder and constitutes a propulsive motor.
2. Description of the Related Art
Such rockets are known, which have a nose fuse and which give off the smoke forwardly upon impact, in that the fuse creates a hole in the nose head and ignites the smoke composition. Such a rocket is expensive to manufacture, and a drawback is that if the rocket hits for instance deep snow or another mass and penetrates into it, the development of smoke may terminate.
SUMMARY OF THE INVENTION
The present invention relates to a rocket having a training head and being based on the use of an igniter charge, such as a tracer charge, which is ignited by the propellant powder, and a bursting charge, such as a self-destruction member, which is ignited by the tracer charge. The igniter charge and the bursting charge are situated in the foremost of the powder chamber in the rocket tube, behind the smoke composition in the training head. The igniter charge is ignited by the powder gases during firing or while the rocket is in its trajectory. The igniter charge is slow-burning, and causes a delayed ignition of the bursting charge, which is situated between the igniter charge and the smoke composition situated in a closed chamber in the head. The bursting charge ignites the smoke composition, whereby the pressure in the smoke composition chamber increases. The igniter charge and the bursting charge are situated in a capsule which is relatively loosely attached in the head, for instance by means of weak threads, and the pressure in the chamber forces the capsule rearwardly, whereby it will be lying freely in the rocket tube, which of course is open rearwardly for outflow of the driving gases. At the impact the rocket tube is mainly emptied of driving powder, which has burnt through in the trajectory of the rocket. Thereby an aperture is formed through the rocket for outflow of the smoke gases rearwardly, through the rocket tube.
The rocket according to the invention is inexpensive to manufacture, compared with a rocket having an impact fuse, which, in the present invention, has been replaced by an igniter charge which is ignited by the smoke gases, and a bursting charge. The igniter charge can be a conventional tracer charge, and the bursting charge can be a conventional self-destruction charge. A free aperture for outflow of smoke gases from the smoke composition will be present even if the forward portion of the rocket has penetrated into the substratum upon impact, permitting the outflow of the smoke composition out of the rocket.
The tracer charge further causes a suitable delay of the ignition of the smoke composition. The delay may be adapted to the range of the rocket, whereby the smoke composition may be not be ignited until impact, if one so desires.
REFERENCES:
patent: 3361066 (1968-01-01), Gawlick et al.
patent: 3633512 (1972-01-01), Schlack
patent: 3855930 (1974-12-01), Mulich et al.
patent: 3981241 (1976-09-01), Ambrosini et al.
patent: 4353301 (1982-10-01), Jacobsen
patent: 4643098 (1987-02-01), Gudbrandsen et al.
patent: 5565649 (1996-10-01), Tougeron et al.
patent: 1090076 (1967-11-01), None
Hamarsnes Johans
Strandli Kare R.
Bacon & Thomas PLLC
Nammo Raufoss AS
Tudor Harold J.
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