Low-calibre shot gun bullet, especially for shot guns with a partially or fully distended barrel

• US 6,367,387 B1
• Filed: 05/19/2000
• Issued: 04/09/2002
• Est. Priority Date: 11/22/1997
• Status: Expired due to Fees

• Current Assignee: Wilhelm Brenneke GmbH & Company KG
• Original Assignee: Wilhelm Brenneke GmbH & Company KG
• Inventors: Krüper, Wolfgang
• Primary Examiner(s): TUDOR, HAROLD JAY
• Application Number:
  US09/554,818
• Time in Patent Office: 690 Days
• Field of Search: 102/501, 102/507-510, 102/514-519, 102/520-523, 102/439, 102/448, 244/3.26
• US Class Current: 102/439
• CPC Class Codes: F42B 14/064 Sabots enclosing the rear end of a kinetic energy projectile, i.e. having a closed disk shaped obturator base and petals extending forward from said base
• CPC Class Codes: F42B 7/10 Ball or slug shotgun cartridges

Abstract

The present invention relates to an under-calibered gun-barrel bullet, in particular for guns with a partially or fully rifled barrel, which is received by a thrust cage. The task of the present invention is providing a further such gun-barrel bullet. This task is solved thereby that the under-calibered gun-barrel bullet comprises a shell jacket (2) which, relative to its loaded position, receives a bullet core (3) displaceable in the direction of the gun-barrel end, whose displacement caused by the blast generation in the shell jacket (2), is limited by an abutment (9) whereby the final form of the gun-barrel bullet (1) is established.

Claims

1. A shot gun cartridge for a rifled barrel of a shot gun, comprising:

(a) a cartridge case stationarily disposable in a shot gun and having a forward end locatable adjacent to an entry end of a rifled barrel of the shot gun;

(b) a thrust cage having a back end, an annular tubular body attached to and extending forwardly from the back end, and a front end on the annular tubular body defining a front opening, the thrust cage being disposed in the cartridge case with the front end of the thrust cage located adjacent to the forward end of the cartridge case, the thrust cage being movable relative to the cartridge case forwardly toward the entry end of the rifled barrel of the shot gun in response to a blast generated in the cartridge case rearwardly of and transmitted to the back end of the thrust gage; and

(c) a sub-calibered bullet disposed in the thrust cage, the sub-calibered bullet including

(i) a shell jacket disposed in the annular tubular body of the thrust cage and having a front face disposed adjacent to the front end of the thrust cage, a rear face spaced forwardly of the back end of the thrust cage, respective forward and rearward portions connected together in a tandem arrangement with one another and extending between the front and rear faces, and an axial bore defined through the shell jacket by the forward and rearward portions and longitudinally extending between the front and rear faces, the bore having a larger maximum cross-sectional size in the forward portion than in the rearward portion of the shell jacket and defining front and rear openings in the shell jacket at the front and rear faces thereof, and

(ii) a bullet core including a front portion having a forwardly tapering configuration so as to provide a head extending forwardly through the bore in the forward portion of the shell jacket, a back portion larger in cross-sectional size than the front portion of the bullet core and the bore in the rearward portion of the shell jacket so as to provide a back plate, and an intermediate portion smaller in cross-sectional size than the bore in the forward and rearward portions of the shell jacket so as to provide a shaft extending through the rear opening of the shell jacket and between and interconnecting the head and back plate and adapted to guide slidable movement of the bullet core relative to the shell jacket from a pre-blast position providing an initial loaded form of the bullet, in which the shaft extends through and rearwardly of the rear opening of the shell jacket and supports the back plate at a location spaced rearwardly of the bore and the rear face of the shell jacket and adjacent the back end of the thrust cage with the head disposed substantially within the bore in the forward portion of the shell jacket and extending forwardly through the front openings of the shell jacket and thrust cage, to a post-blast position providing a final form of the bullet shot from the gun, in which the back plate is disposed rearwardly of the bore of the shell jacket and exteriorly of and flush against an abutment defined by the rear face of the shell jacket and the head projects forwardly of the front face of the shell jacket and the front opening therein, in response to the thrust cage being moved forwardly relative to the cartridge case in response the blast generated in the cartridge case rearwardly of the back end of the thrust cage.

2. The cartridge of claim 1 wherein the back plate of the bullet core has a cross-sectional size substantially the same as the cross-sectional size of shell jacket.

3. The cartridge of claim 1 wherein the shell jacket has a cylindrical configuration.

4. The cartridge of claim 1, further comprising:

means on the bullet core for holding the bullet core at the post-blast position relative to the shell jacket to stabilize the bullet core thereat at least until the bullet impinges on a target.

5. The cartridge of claim 4 wherein the holding means is a clamp plate slidably disposed about the intermediate portion of the bullet core for frictionally engaging both the bullet core and shell jacket at least when the bullet core is at the post-blast position relative the shell jacket.

6. The cartridge of claim 4 wherein the holding means is knurling on the intermediate portion of the bullet core for frictionally engaging the shell jacket at least when the bullet core is at the post-blast position relative the shell jacket.

7. The cartridge of claim 1 wherein the bullet core is made at least partially of a material harder than that of the shell jacket.

8. The cartridge of claim 1 wherein the cross-sectional size of the front opening of the shell jacket is only slightly larger than the maximum cross-sectional size of the forward portion of the bullet core such that the front opening of the shell jacket is substantially closed by the bullet core when the bullet core is at the post-blast position relative the shell jacket.

9. The cartridge of claim 1 wherein the cross-sectional size of the front opening of the shell jacket is larger than the maximum cross-sectional size of the forward portion of the bullet core such that an annular gap is formed between the bullet core and shell jacket when the bullet core is at the post-blast position relative to the shell jacket.

10. The cartridge of claim 1 wherein:

the shell jacket has an internal annular shoulder formed by the rearward portion of the shell jacket which reduces the bore to a smaller cross-sectional size in the rearward portion than in the forward portion of the shell jacket; and

the bullet core has a maximum cross-sectional size larger than the cross-sectional size of the bore in the rearward portion of the shell jacket so as to abut the annular shoulder of the shell jacket when the bullet core is at the pre-blast position relative to the shell jacket.

11. The cartridge of claim 1 wherein the forward portion of the bullet core has a pair of reversely-arranged truncated cone segments.