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Патент USA US3096725

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July 9, 1963
Filed Feb. 28, 1959
g‘fw'i Q4" 37 7
United States Patent O?fice
Georges Dufour, Geneva, Switzerland, assignor to Brevets
Aero-Mecaniques S.A., Geneva, Switzerland, a society
of Switzerland
Filed Dec. 28, 1959, Ser. No. 862,401
Claims priority, application Luxembourg Jan. 19, 1959
3 Claims. (Cl. l02—-52)
Patented July 9, 1963
eter equal to the external diameter of the projectile,
whereas its inner wall is a cylindrical wall adapted to ?t
on the rear portion 4 of the ogive.
This base includes, behind its front portion 5, an ex
tension 6 in the form of a hollow cylinder opened at the
rear; the outer wall of which is of a diameter smaller
than the external diameter of the projectile, whereas its
inner wall limits a recess adapted to receive a powder
composition 7, for instance an incendiary one or a tracing
The present invention relates to armor-piercing pro
jectiles for guns having a barrel provided with ri?es, such
projectiles including a core of a hard material surround
is ?tted and secured, for instance by screwing, around
ed by an ogive made at least partly of a light material,
extension 6, the outer wall of ring 8 being of a diameter
equal to the external diameter of the projectile. This ring
the terms “light material" including not only light metals
A rear ring 8 of a hard material, for instance of steel,
and alloys but also all other substances such as plastic 15 8 carries a driving or rotating band 9, for instance of cop
per, sintered iron, soft steel or any suitable material, of an
of steel.
external diameter greater than that of the projectile body.
The invention is more especially concerned with armor
This band 9 is for instance partly inserted in a groove
piercing shells of small calibre.
provided in ring 8.
The chief object of the present invention is to provide 20
Advantageously, before ?tting the rear portion 4 of the
a projectile of this type which is better adapted to meet
ogive into the front portion 5 of the base, there is in
materials having a density substantially lower than that
the requirements of practice, not only from the point of
view of their armor-piercing properties but also from the
point of view of the preservation of the barrel of the gun
serted, along the front edge of said rear portion 5, a ring
density material (hard sintered metal, tungsten carbide and
gun barrel.
10 of a hard metal such as steel, this ring 10 bearing
against a shoulder 11 provided between the front portion
25 2 of the ogive and its rear portion 4. Thus, said ring 10
from which they are ?red.
According to this invention, the ogive of such a pro
is ?nally caught between shoulder 11 and the front edge
jectile includes a rear portion of a cross-section smaller
12 of the base 5.
than the maximum cross-section of the front portion of
Ring 10 is ?ush with the front portion 2 of the ogive
said ogive, this rear portion, which surrounds the rear
and the active area of said ring (area in contact with the
portion of the core, being itself surrounded by a base
inner surface of the gun barrel) projects slightly beyond
also made of a light material, said base including a rear
the outer wall of the portion 5 of the projectile.
ward extension surrounded by a ring of a hard material
The rear portion of the projectile is guided in the gun
in which is ?xed at least one driving or rotating band
barrel by two portions B and C of ring 10, said portions
for giving the projectile its spin.
preferably having a diameter equal to that of the active
A preferred embodiment of the invention will be here
area of ring 10.
inafter described with reference to the accompanying
The chief advantages of such a projectile are as follows:
drawing, given merely by way of example and in which
the ratio of the weight of core 1 to the total weight of the
the only ?gure illustrates an armor-piercing projectile
projectile which reaches about 54% for a 20 mm. shell
of small calibre made according to this invention, one half
as above described is very satisfactory since the armor
being shown in elevation and the other half in axial 40 piercing projectiles thus obtained have substantially the
same weight as shells of other types to be ?red from the
The essential element of this projectile, which is to
same gun; the portions of the projectiles made of light
perform the armor-piercing function thereof, is a core 1,
material do not risk to clog the inner wall of the gun
having a pointed front end, which should of course store
barrel; accuracy of ?ring, due to the double guiding at
up the maximum possible of kinetic energy under the
the front at A and at the rear at B and C, remains un
smallest possible volume so that it is made of a high
changed during the travel of the projectile through the
In a general manner, while I have, in the above descrip
The point of core 1, which is not very sharp, so as to
tion, disclosed what I deem to be a practical and e?'icient
obtain a good armor-piercing effect, is covered by an 50 embodiment of my invention, it should be well under
ogive of sharper shape made of a light material such as
stood that I do not wish to be limited thereto as there
aluminum or an aluminum alloy, copper or magnesium,
might be changes made in the arrangement, disposition
such an ogive improving the ballistic properties of the
and form of the parts without departing from the principle
projectile and also its armor-piercing action due to the
of the present invention as comprehended within the
lubricating effect exerted when said ogive is crashed 55 scope of the accompanying claims.
against the point of impact.
What I claim is:
This ogive includes the following portions: on the one
l. A projectile which comprises, in combination, an
hand, a sharp front portion 2 adapted to cover the point
armor piercing core, an ogive mounted on said core to
of the core and which advantageously leaves a free space
surround it, said ogive being made of a material of a
between the ogive and the core in which can be packed 60 density much lower than that of said core, said ogive
a burning composition 3, for instance an incendiary one;
having a cylindrical rear portion of a cross section small
this front portion 2 extends to the rear end of the ogive
er than the maximum cross section of its front portion,
of the core, behind which said core becomes cylindrical,
the outer wall of said ogive forming, between said front
and on the other hand, a rear portion 4 substantially of
portion and said rear portion thereof, a rearwardly facing
cylindrical shape, surrounding the rear portion of the core, 65 annular shoulder, a cylindrical base ?tting tightly around
this rear portion 4 of the ogive being of a diameter
said ogive rear portion, said base being made of a ma
smaller than that of the base of front portion 2.
terial of at least approximately the same density as said
This rear portion 4 of the ogive is engaged in the front
ogive, the front edge of said base being at a distance from
portion 5 of a base also made of a light material, this
said shoulder and facing it, a solid front guiding ring of
front portion 5 having the shape of a hollow cylinder
a material harder than that of said ogive ?tted on the side
opened at the front, the outer wall of which has a diam
wall of said rear portion of the ogive, extending from
said shoulder to said base front edge and having an outer
diameter slightly greater than that of said base and that
of the outer edge of said shoulder, a rear cylindrical ex
tension of said base integral therewith, said extension
having an outer diameter smaller than that of said base,
a rigid rear cylindrical guiding ring ?tting tightly around
said rear extension, said rear ring being made of a ma
terial different from that of said rear extension and of
substantially the same hardness as that of said front
ring, said rear ring further having an outer diameter 10
substantially equal to that of said base and to that of the
outer edge of said shoulder, and a driving band of a
metal softer than that of said guiding rings ?xed around
said rear ring for giving the projectile its spin, said driv
ing band having an outer diameter greater than that of 15
said guiding rings and further having an axial length
substantially less than the axial length of said rear guiding
2. A projectile according to claim 1 and further in
cluding a powder charge inserted between the point of
the core and the front portion of the ogive.
3. A projectile according to claim 1 and further in
cluding a powder charge disposed in a recess formed in
said base extension.
References Cited in the ?le of this patent
Whitney ____________ __ Nov. 12,
Norton et a1. ________ __ Nov. 22,
Ciccone ____________ __ Aug. 25,
Read ________________ __ Mar. 21,
Switzerland __________ __ July 16, 1938
Great Britain ________ __ Mar. 10, 1947
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