Process of producing a propellant charge igniter

Details Process of producing a propellant charge igniter Process of producing a propellant charge igniter

1998-09-02

2001-10-16

Jordan, Charles T. (Department: 3643)

Ammunition and explosive-charge making

Ammunition making

Caps and cartridges

C102S202000

Reexamination Certificate

active

06302008

ABSTRACT:

REFERENCE TO RELATED APPLICATIONS
This application claims the priority of German Application Ser. No. DE 197 384 19.6 , filed Sep. 3, 1997 which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
The present invention relates to a process of producing a propellant charge igniter for cartridge ammunition which igniter comprises an ignition tube containing a booster charge. More particularly, the present invention relates to a method of producing such a propellant charge igniter wherein the ignition tube is composed of a sheathing tube provided with ignition openings, and a thin-walled protective tube that is arranged inside the sheathing tube to protect the booster charge, which protective tube rests with its external wall against the internal wall of the sheathing tube and covers the ignition openings.
In order to protect the booster charge against external environmental influences (e.g., against moisture entering from the outside) or against components of the propellant powder surrounding the propellant charge igniter, which can come in contact with the booster charge as a result of sweating, migration or plasticizer migration), known propellant charge igniters are provided with a thin-walled protective tube, the outside wall of which fits flush against the inside wall of a sheathing tube provided with ignition openings and covers these openings. Practical tests performed with such propellant charge igniters have shown that microscopic gaps or clearances can occur between the sheathing tube and the protective tube, which gaps or clearances reduce the protective effect.
It is therefore the object of the present invention to provide a process of producing a propellant charge igniter of the type discussed above, which avoids the occurrence of microscopic gaps or clearance.
SUMMARY OF THE INVENTION
The invention according to a first embodiment is essentially based on the idea of filling the sheathing tube on the base side with a predetermined amount of sealing agent which has the consistency of paste during the processing, and to push this sealing agent into the sheathing tube with the aid of the protective tube, which is closed on one end, so that the protective tube can slide into the sheathing tube and seal any possibly existing spaces between the sheathing tube and the protective tube and subsequently harden therein. During the production, the excess sealing agent is pushed out from the inside through the ignition openings, and is then removed on the outside.
According to a second embodiment of the invention, an approximately 15 mm thick coating of sealing agent preferably is applied to the protective tube in the base region of the sheathing tube, and the protective tube, preferably with the coating, is then pushed into the sheathing tube to its limit. The sealing agent then is injected, e.g., with the aid of a cartridge, from the outside, through the individual ignition openings or bores. Possibly existing gaps between the protective tube and the sheathing tube in the region of the ignition openings or bores are closed and the bores are filled. If desired, the sheathing and protective tubes can then be moved axially relative to one another to further distribute the sealing agent.
In the alternative embodiment, possibly existing microscopic gaps or clearances are not filled completely, but only partially. That is, only at those locations where moist and volatile propellant charge components can enter are the gaps filled.


REFERENCES:
patent: 2424993 (1947-08-01), Meister
patent: 2446187 (1948-08-01), Meister
patent: 3311013 (1967-03-01), Phipps
patent: 4822649 (1989-04-01), Canaud et al.
patent: 5670735 (1997-09-01), Ortmann et al.
patent: 1 534 469 A (1978-12-01), None

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