Cartridge-case base for a sub-caliber projectile

Details Cartridge-case base for a sub-caliber projectile Cartridge-case base for a sub-caliber projectile

1999-09-27

2001-12-04

Tudor, Harold J. (Department: 3641)

Ammunition and explosives

Projectiles

Composite

Reexamination Certificate

active

06324986

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a sabot for a sub-caliber projectile in the form of a fin-stabilized projectile, having a sabot body in which the fin-stabilized projectile is anchored, and a sabot shell, which partially surrounds the front and rear end of the fin-stabilized projectile and at least partially the sabot body, wherein the sabot body is partitioned into segments by slits, and wherein the slits are limited by predetermined breaking points at one end of the sabot body.
BACKGROUND OF THE INVENTION
Problems often occur in connection with such sabots, which lie in the difficulty of providing sealing of the sabot and the sub-caliber projectile, or respectively fin-stabilized projectile, against the high-pressure propulsive gases being generated upon firing.
A sabot in accordance with the preamble is known from EP-A-0 624 774, wherein the, sabot body has an area which is not enclosed by the sabot shell and has a circumferential groove for fastening a shroud. To overcome the above mentioned sealing problems, longitudinal slits and predetermined breaking points are provided in the sabot body, wherein the predetermined breaking points are provided in the area of the interior diameter at the acceleration portion of the sabot body. In the area of the circumferential groove, the longitudinal slits have a T-shaped cross section with two shoulders, which are used as additional sealing faces for the material of the sabot shell located in the longitudinal slits. The acceleration portion of the sabot body is designed to be partially in the shape of a truncated cone with a shell surface widening toward the front. The sabot shell furthermore has a sealing cap, which is designed to work together with the acceleration portion of the sabot body, and a seal.
Further improvements regarding sealing, weight reduction and fragment formation during firing, as well as a simplified structure, are achieved with a further development of the above described sabot known from EP-A-0 855 573. In this case, the sabot body is completely surrounded by the sabot shell, wherein the sabot shell also partially encloses the rear end of the fin-stabilized projectile. The sabot body has the shape of a hollow cylinder provided with circumferential grooves, whose exterior diameter is small in comparison with the diameter of the sabot shell.
With the above described sabots, the fin-stabilized projectile is anchored in the form of a screw connection, wherein the threads of the screw connection must be considered a weak point in regard to sealing.
OBJECT AND SUMMARY OF THE INVENTION
It is therefore an object of the invention to propose a sabot of the type mentioned at the outset which does not have this disadvantage.
This object is attained by the invention recited in the claims. Here, the anchoring is constituted by grooves arranged on the fin-stabilized projectile, which are engaged by ring-shaped protrusions provided in an axial bore of the sabot body. The distance of the first protrusion from the pre-determined breaking points and the height of the protrusions are selected to be such that the deformation at the predetermined breaking points in case of an assembly-related spreading lies within a resilient range. The advantages which are obtained by the invention can be seen in that sealing is further improved by means of the proposed anchoring. The design of the sabot body proposed by the first embodiment in the form of a double truncated cone makes possible an improved effect of the propulsive gases during firing in comparison with the last-mentioned prior art, and a weight saving in comparison with the first-mentioned prior art.
The invention will be explained in greater detail in what follows by means of two exemplary embodiment in connection with the drawings.


REFERENCES:
patent: 3927618 (1975-12-01), Engel
patent: 4517899 (1985-05-01), Haberl
patent: 4535698 (1985-08-01), Yuen
patent: 4747191 (1988-05-01), Montier et al.
patent: 4833995 (1989-05-01), Gotz et al.
patent: 5404816 (1995-04-01), Burri
patent: 5789699 (1998-08-01), Stewart et al.
patent: 0 300 373 A2 (1989-01-01), None
patent: 0 624 774 A1 (1994-11-01), None
patent: 0 643 279 A1 (1995-03-01), None
patent: 0 853 228 A1 (1998-07-01), None
patent: 0 855 573 A1 (1998-07-01), None

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