Automatic cannon having an ammunition-receiving device

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BACKGROUND OF THE INVENTION

The present invention relates to an automatic cannon having a receiving device for damping the movement of caseless ammunition as it is loaded. More particularly, the invention is directed to a receiving device for use with an automatic cannon of the type having a wedge-type breech, wherein a linearly advanced and retracted feed finger is employed for transporting the caseless ammunition through feed openings in the weapon housing and the breech and into the cartridge chamber of the gun barrel.

In automatic cannons having a wedge-type breech, the ammunition is conveyed into the cartridge chamber of the gun barrel. The cartridge is pushed into the chamber by a feed finger which performs a forward and backward movement. This movement is always accelerated after a reversal of direction and is decelerated before a reversal of direction. When, during the feeding process, the movement of the feed finger is decelerated, the cartridge moves ahead of the feed finger and into the cartridge chamber. The cartridge recoils against the still-advancing feed finger and is pushed back by the finger into the cartridge chamber. With cartridge ammunition this does not result in malfunctions because the cartridge case is easily able to withstand the resulting mechanical stresses. The situation is different for caseless ammunition. If the recoiling ammunition hits against the advancing feed finger, the powder of the ammunition will break off to a greater or lesser degree in the impact area. The still-advancing feed finger is then no longer able to push the cartridge completely into the cartridge chamber. Accordingly, the part of the powder body of the caseless ammunition which projects from the cartridge chamber may be sheared off by the wedge-type breech as it closes. This may cause dangerous ignition of the ammunition outside the weapon.

SUMMARY OF THE INVENTION

It is an object of the invention to provide a receiving device for caseless ammunition which avoids sudden impact of the ammunition introduced into the cartridge chamber of the weapon.

This object is accomplished by providing a receiving device having means for damping the forward movement of the ammunition as it enters the weapon .

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view of the weapon housing of an automatic cannon having a receiving device according to the present invention.

FIG. 2 is a longitudinal sectional view of the weapon housing seen along line 2--2 of FIG. 1.

FIG. 3 is a longitudinal sectional view of the weapon housing along line 2--2 of FIG. 1, with an inserted caseless piece of ammunition being additionally shown.

FIG. 4 shows a modification of the invention employing additional spring means in the breech wedge.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The invention is based on the realization that, during the feeding of caseless ammunition 4, its disadvantageous recoil can be prevented by suitable damping means. Two embodiments of a receiving device which inhibits recoil when the ammunition 4 is loaded into an automatic cannon will be discussed below.

In the first embodiment of the invention (see FIGS. 1-3), leaf springs 2 are provided in the rear portion of weapon housing 1 for damping the forward movement of caseless ammunition 4. The free front ends 2a of leaf springs 2 project into the feed path for caseless ammunition 4 and thus constrict the feed opening 3 for the ammunition 4. The leaf springs 2 extend around corresponding bracing fingers 11, which extend outward from the rear side of weapon housing 1 and provide internal supports which prevent leaf springs 2 from being permanently deformed should some object accidentally strike them.

According to FIG. 1, three such leaf springs 2 are provided, one of these leaf springs 2 lying precisely on section line 2--2, while the other two leaf springs are placed symmetrically to the first, to the right and to the left thereof and offset by about 135.degree. with respect to the first leaf spring 2. The fixed ends of leaf springs 2 are each fastened to weapon housing 1 by means of a screw 2b. The free end 2a of each leaf spring 2 is bent radially outwardly and projects freely movably into a recess 1a provided in weapon housing 1 in such a manner that, if pressure is applied, the free end 2a of the leaf spring 2 is able to yield by springing radially outwardly. Every piece of ammunition 4 advancing into cartridge chamber 10a of gun barrel 10 must widen the feed opening 3 constricted by leaf springs 2 as they project radially inwardly, i.e., once projectile 4b connected with powder body 4a has passed leaf springs 2, the powder body 4a of the advancing ammunition 4 presses leaf springs 2 radially outwardly. The tensioned leaf springs 2 exert a counterpressure on the outer surface of powder body 4a and thus brake the advance of ammunition 4, preventing it from moving ahead of the driving feed finger 5 of the feed mechanism (not shown). This ensures that feed finger 5 is always in force-transmitting contact with the rear face of powder body 4a and thus advances the ammunition 4 safely and without damaging impact movements into cartridge chamber 10a. Advisably, the local position of leaf springs 2 is selected so that the first contact of powder body 4a with leaf springs 2 takes place immediately before the start of the deceleration movement of feed finger 5.

In the further embodiment of the invention illustrated in FIG. 4, further leaf springs 7 are provided in feed opening 3a which is disposed in the breech wedge 6 itself. These further leaf springs 7 constitute an additional restraint for the ammunition as soon as its powder body 4a comes in contact with them. These additional leaf springs 7 reliably prevent recoil movements even at higher feed velocities.

In modification of the invention, the spring paths and/or the spring characteristics of leaf springs 2 and 7 can be dimensioned differently, for example so that the ammunition 4 is initially decelerated only slightly in the region of leaf springs 2 and is then decelerated more in the region of springs 7.

The present disclosure relates to the subject matter disclosed in patent application P 36 18 267.2, filed May 30th, 1986 in the Federal Republic of Germany, the entire specification of this German application being incorporated herein by reference.

It will be understood that the above description of the present invention is susceptible to various modifications, changes and adaptations, and the same are intended to be comprehended within the meaning and range of equivalents of the appended claims.

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