US1240293A - Projectile and process of making the same. - Google Patents

Description

zn. H. ARMSTRONG.

PROJECTILE AND PROCESS -OF MAKING THE SAME.

Patented Spia. 18, 1917.

` APPLICATION FILED JULY 26. 19.16. 1,240,293.

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DENSON H. ARMSTRONG, 0F GRAND RAPIDS, MICHIGAN.

PROJCTILE AND PROCESSOF MAKING THE SAME.

Speeication of Letters Patent. Patented Sept, 18, 1917.

Application led liuly 26, 1916. j Serial No. 111,479.

small arms using high explosives, and of that type wherein the body of the projectile is of soft metal and carries an external jacket consisting of a strand of wire sheathed with threads of cotton 0r other suitable material and wound spirally, the jacket forming a vehicle for a lubricant; and to an improved method of making the same.

The broad or general type of projectile above referred to is well known and is disclosed in the patent to Lisle No.1622, ?72 of- April 11, 1899; and inasmuch-as projectiles of this type have been in common use for a number of years, their radical advantages are well known and appreciated and need not be discussed in this specification.

The principal objects of the present invention are to provide a projectile of the broad type stated and a method of making the same whereby an unusually strong and secure union of the jacket and the projectile body is effected, and the projectiles will uniformly have great'penetrating power and aV true flight in a flattrajectory, and whereby the manufacture of the projectiles may be carried on more expeditiously, with greatly 'i lessened cost, with practically no loss by reason of bad or defective projectiles and with uniform superiority of the product achieved.

The nature of the invention will be ex-v plained atlength in the following description, taken in connection with the accompanying drawing, wherein 4 Figure 1 is a perspective view of the spirally wound jacket;

Fig. 2 is a longitudinal sectional view of the projectile prior to swaging; and.A

Fig. 3 is an elevation of the finished projectile. i

Similar characters of reference designate corresponding parts throughout the several views.

The jacket 1 consists of a fine strand of wire of suitable ductile metal harder than the body of the projectile, which 1s sheathed with layers of threads 2 of cotton or other suitable material,4 the said threads being Wound Spirally about the wire strand. The strand is then wound spirally into the form of a cylinder whose convolutions are preferably in immediate juxtaposition or in contact with one another; and the ends of the strand are extended, as at 3 and 4, in the direction of the longitudinal axis of the cylinder, the extended end 3 being located within the'cylinder and the extended end 4 projecting beyond the cylinder.

In makingl the projectiles the jackets originally constructed 'as' above described are placed within the molds and thereafter the molten metal is poured in the molds whereby the body 5 will be cast within 4the jacket whose axially extended ends 3 and 4 will be securely anchored lor embedded inthe said body. i o

Fig. 2 shows the projectile at the completion of the molding operation and afterit has been cut from the sprue. At this point it should be notedthat experience has demonstrated that the molten metal does not of the jacket is sheathed and that the projectile maybe removed from the mold with much greater facility and safety than is possible in the method heretofore employed in manufacturing,projectiles of the type to which the present invention relates. The association of the jacket with the projectile body by casting the latter within the jacket not only establishes an eiicient initial union of the jacket and the projectile body but also renders it unnecessary to weakenthe body by cutting deep grooves therein in which the ends of the jacket may be secured.

The projectile as taken from the mold is subcaliber; and in this' form is placed.

in a suitable swage and subjected to pressure burn the threads with which the' wire strand by a suitable arrangement of plungers whereby the finished projectiles will all be of uniform weight and size,surplus metal will be removed from the pointof the bullet slug, and the usual gas check 6 will be apioo i plied to the shoulder'of the bullet body in the rear of the jacket.

The swaging operation brings the bullet up to the required caliber, shortens its length and increases its diameter. This operation as appliedto a bullet in accordance with the the form and present invention changes dimensions of the jacket, lshortenin the length of the latter, considered as a cylinder,

and increasing the diameter and, hence, the

circumference of its convolutions; and by virtue of this change in the form and dimensions vof the jacket fin connection with the shortening and expansion of that-portion of the projectile body which the jacket surrounds, insures a union of the strongest pos- -sible character between' the jacket and the projectile body.

jacketv is formed permits of the increase inv diameter and circumference of the convolutions as described, the cotton sheathlng of the wire permits of the closer association or crowding' of the convolutions in consequerbce of the 'shortening of the length 'of the jacket, considered as a cylinder, and the immediate juxtaposition or vcontact'of the convolutions of the jacket provides an uninterrupted surface against-which the portion of the projectilevbody within the jacket bears andby virtue of which'the convolutions of the jacket will not cut into said body, or,

. stated otherwise,the material of said body areawith theriflin of the gun, thus promotingthe cleanin o the gun by the projectile and insuring o 4the accuracy of the flight of the projectile. Moreover, when the projectile is swaged to the required'caliber, the

wire in which the jacket is formed isA stretched to a certain extent andthe convolutions of the jacket are under tensioning The ductility of the wire from which the;

circumferential stress, the effect of which is to prevent any flattening or vexpansion, of the projectile body when it strikes the target and, hence, to insure that the projectile shall have great penetrating power and to avoid any substantial loss Aof metal during itsfr penetration.v

I claim- 1; A projectilel comprising a jacket and a soft metal body within the jacket, the jacket consisting of a strand of ductile. wire sheathed 'with threads of cotton or like matewhoseconvolutions contact with one another and are under .tensioning clrcumferential stress and compressive transverse stress and rial and wound spirally to form a cylinder whoseends are extended an ularly and emi bedded within the soft meta body.

2. The method of making a yprojectile for small arms which consists in coiling a strand.l

of ductile wire into the form of a cylinder whose convolutions are in contact, in casting the soft metal body of the' projectile subcaliber witliin said cylinder and vanchoring the ends of said cylinder in said body, and in thereafter swaging the projectile to bring it up to the re uired caliber whereby vthe convolutions of t e cylinderare increased in diameter and circumference,A are' crowded against one another, and bear with increased press/ure on the` inclosed portion of the soft metal body. Y.

In testimony whereof I havehereunto set my hand in presence of two subscribing witnesses.

DENSON H. ARMSTRONG. Witnesses: f

` I-I. ERNEST vWARimN,

' CHARLES W. SAWYER.

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