US2303449A - Jacketed bullet - Google Patents

Description

Dec. 1, 1942. E. FLEISCHMANN 2,303,449

JACKETED BULLET Filed Nov. 21, 1939 Fig.4.

v/ 7 fig/fig? P'atented Dec. 1, 1942 JACKETED BULLET Ernst Fleischmann, Clairton,

Copperweld Steel Company,

Pa., assignor to Glassport, Pa., a

corporation of Pennsylvania Application November 21, 1939, Serial No. 305,495

3 Claims.

This invention relates generally to projectiles nd particularly to a jacketed bullet such as a .fle bullet or the like.

It has been recognized heretofore that the pr0- ision of a jacket of relatively soft material on bullet of relatively hard material such as steel 1" the like. reduces ricocheting and increases penmating power. Copper-jacketed steel bullets, for sample, have been used and show a deeper pen- ;ration than a steel-jacketed lead bullet. Diffiilty has been experienced, however, in mainiining the copper jacket precisely concentric ith the body portion of the bullet, when rolling copper clad billet down to rod. s tock suitabla ar the manufacture of bullets: Be'dcgsec'ifit e ifi'erence between the specific'gravit'efs' of 4 nd steel, any lack of concentricityf-"bf ith respect to the body rendetintheb nbalanced, i. e., the center H 'ansverse section does not no 'ith the geometrical centen of the section. Such nbalance causes the bullet to deviate from a :raight line when firing'and thus reduces the ccuracy of fire considerably.

I have invented a novel jacketed bullet which vercomes the aforementioned objection. In a referred embodiment the bullet of my invention Jmprises a core or body portion of suitable ma- :rial, e. g., steel, and a jacket of relatively softer material. 1g a specific gravity substantially the same as wt of the material of which the body portion r core of the bullet is composed. Thus any vol; of concentricity between the body or core nd the jacket will not render the bullet unbalneed. The center of gravity of any transverse action will coincide precisely with the geometric enter thereof.

The accompanying drawing illustrates a prearred embodiment of the invention. In the rawing,

Fig. 1 is aside elevation of a jacketed bullet ccording to the invention;

Fig. 2 is a transverse section thereof taken long the plane of line H-II of Fig. 1;

Fig. flis a longitudinal section therethrough then along the plane of line III--III of Fig. 1; nd

Fig. 4 is a viewsimilar to Fig.3 showing a modication.

Reierring in detail to the drawing, a. jacketed .lllet indicated generally at Ill comprises a body core II and a sheath or jacket l2. As shown I the drawing, the sheath is not concentric with re core or, stated dinerently, the thickness 0! The jacket is composed of metal hav- 9 the sheath is not uniform at all points around the circumference of the bullet. This is a condition frequently encountered in manufacturing composite bar stock such as that from which the bullet l0 may best be made. The sheath is bonded to the core by any suitable method so that the bullet as a whole is a unitary object. The core H is preferably of steel.

The metal of which the jacket I2 is composed may be of any suitable composition so long as it has a specific gravity substantially the same as that of steel, i. e., approximately 7.88. One metal which is suitable for the purpose is an alloy of-icopper, aluminum and iron comprising about 90% copper, 8.5% aluminum, and 1.5% iron. This alloy has a specific gravity of 7.79 which is sufliciently close to that of steel to preelude any. unbalance resulting from slight nonuniformities the thickness of the jacket at wil'ufls pc ints 'around the body or core.

If "fi re ody of the bullet is composed of metal other tin steel, the metal of which the jacket is co pibsed will be chosen so that its specific ravity conforms as closely as may be to that of the metal of which the body is composed.

Bullets made in accordance with the invention may be of any desired shape or size for various applications and may be manufactured by the same methods and apparatus as used heretofore for making jacketed bullets.

The bullets may, for example. be turned down from bar stock as shown in Figure 3 or swedged down, either hot orcold, as shown at I 0' in Figure 4. In the former case, the jacket is removed adjacent the nose of the bullet by the turning Operation. In the latter case, the jacket is merely thinned slightly adjacent the nose.

Bullets made in acoordancaw lth the invention are characterized by the desirable qualities of bullets known heretofore having a jacket of a, metal relatively softer than the body. such as reduction in ricocheting and increased penetrating power. They also have the further advantage above pointed out, via, the higher firing accuracy made possible by elimination of the unbalance resulting from slight non-uniformity in the thickness of the jacket or lack of concentricity between the jacket and body. The invention thus makes it unnecessar to guarantee an absolutely' uniform thickness of 0031111183111 order to preclude the unbalanced condition thereby facilitating the manufacture of bullets and reducing the cost thereof. 7

Although I have disclosed herein but a pre- 55 ferred embodiment of the invention, it will be understood that slight departures from the general principle thereof may be made within the scope or the appended claims.

I claim:

1. A jacketed bullet comprising a steel body and a jacket composed of an alloy comprising about 90% copper, 8.5% aluminum and 15% iron.

2. A bullet having a core or body 0! steel and a jacket thereon composed of an alloy which is predominantly of copper-and has substantiaiiy the same density as steeL,

3. A bullet having a metal core or body am Jacket thereon composed 01. an alloy predomi- 5 nantiy of copper and having substantiaiiy th same density as the metal of which the core c:

body is composed.

. ERNST FLEISOHMANN.

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