Cartridge tube for rifle grenade capable of retaining the bullet

Details Cartridge tube for rifle grenade capable of retaining the bullet Cartridge tube for rifle grenade capable of retaining the bullet

1993-06-07

1994-09-27

Tudor, Harold J.

Ammunition and explosives

Shells

Grenade

42105, F42B 3006

Patent

active

053499069

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention concerns a rifle grenade and, more precisely, the cartridge tube which is disposed at one end of the said grenade whereby it can be placed on the barrel of a rifle.
The cartridge tube of a rifle grenade contains a bullet trap according to prior art which, by stopping the bullet, allows the grenade to be fired by means of any kind of munition and in particular a live cartridge.
The deceleration of the bullet by the trap generates metal fragments (such as pieces of the bullet casing) and these fragments are ejected in the direction of the firer when the grenade leaves the barrel of the rifle.
These fragments are ejected even more violently when an additional propellant charge is placed in the cartridge tube. Attempts have already been made to limit or prevent such ejections by placing a plate made of elastic material at the entry to the bullet trap.
Reference may be made for example to French patent 1599746 which describes a bullet trap on which a plate made of an elastic plastics material is placed. The plate is penetrated by the bullet and closes again immediately thereafter, thus preventing fragments from being ejected towards the firer.
French patent 2517820 also describes a bullet trap for rifle grenades which incorporates a steel trap with a washer made of a damping material arranged inside a support tube. The trap is closed by a woven nylon cap the function of which is to protect the firer against the bullet fragments and which is tightly fitted or bonded to both the cartridge case and the trap.
Experience shows that these solutions are unsatisfactory and that bullet fragments are still projected out of the cartridge tube.


SUMMARY OF THE INVENTION

An object of the invention is to provide a cartridge tube which creates better protection for the firer by retaining the fragments of the bullet with greater efficiency than the known systems described above.
The subject of the invention is therefore a cartridge tube for a grenade capable of being fired from a weapon by a live munition, the tube containing first a bullet trap designed to stop the bullet and, secondly, a plug made of a deformable material, designed to prevent the fragments produced by the impact of the bullet on the bullet trap from escaping from the cartridge tube, this tube being characterised by the fact that the plug bears against a wall positioned between the plug and the bullet trap, the wall being attached to the cartridge tube and substantially perpendicular to the center line of the said tube, the wall being positioned at a distance from the bullet trap along the center line of the cartridge tube, thus establishing an empty space between the wall and the bullet trap.
This arrangement prevents any interference between the wall upon which the plug bears and the bullet trap at the time of impact of the bullet on the said trap. The wall also grips the plug which assists its reclosure after passage of the bullet.
The wall is attached to a support which is itself fastened to the cartridge tube and includes a bore which retains an outer surface of the plug.
This arrangement facilitates the fitting of the plug and improves its retention as well as its closure following its penetration by the bullet. Preferably, there is a concave depression in the surface of the plug facing the wall.
In a variant, the plug has notches distributed regularly over its outer surface. Also, there may be an opening in the wall of diameter greater than the diameter of the bullet.
The rear portion of the plug may have a smaller diameter than the bore in the support.
In a first embodiment of the invention, the support has a bearing surface against which the plug bears and the wall is attached to a cap which closes off the bore and presses the plug against the bearing surface.
In a variant, the support contains a certain number of orifices through which some of the propellant gases generated by the munition for igniting a rocket can pass and it also has a sealing ring fitted first to an outer surface of the bullet

REFERENCES:
patent: 2853008 (1958-09-01), Bowles
patent: 3664263 (1972-05-01), Driscoll
patent: 3726036 (1973-04-01), Jennings et al.
patent: 4394836 (1983-07-01), Chavee et al.
patent: 4567831 (1986-02-01), Gordon et al.
patent: 4793259 (1988-12-01), Ambrosi et al.
patent: 5153374 (1992-10-01), Gabriels

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