US805556A

US805556A - Projectile.

Info

Publication number: US805556A
Application number: US24576405A
Authority: US
Inventors: Elias M Johnson
Original assignee: ISAAC G JOHNSON AND Co
Current assignee: ISAAC G JOHNSON AND Co
Priority date: 1905-02-15
Filing date: 1905-02-15
Publication date: 1905-11-28
Anticipated expiration: 1922-11-28

Description

PA' IENTED NOV. 28, 1905.

E. M. JOHNSON. PROJEGTILE. APPLICATION FILED rn1s.1s,1so5.

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UNITED STATES PATENT OFFICE.

ELIAS M. JOHNSON, OF NEW YORK, N. Y., ASSIGNOR TO ISAAC Gr. JOHN- SON AND COMPANY, OF NEW YORK, N. Y.

PROJECTILE.

Specification of Letters Patent.

Patented Nov. 28, 1905.

Application filed February 15, 1905. Serial No. 245,764.

To all whom it may concern:

Be it known that I, ELIAS M. JOHNSON, a citizen of the United States, residing at New York, in the countyof New York and State of New York, have invented new and useful Improvements in Projectiles, of which the following is a specification.

This invention has relation to projectiles provided with copper bands which operate as a kind of packing to prevent the gas from escaping by the projectile in the act of firingthat is, when the powder is ignited.

It is the object of the invention to provide such improvements in the seat or score for the band as will render it certain that the band will not turn' in the act of firing, and so prevent the mischief mentioned from occurring.

The invention is fully set forth in the following specification, reference being had to the annexed drawings and letters of reference marked thereon, forming a part of the said specification, of which- Figure 1 is a view in elevation of a projectile provided with a copper band. Fig. 2 is a similar view, but representing the band removed and showing the band score or seat for the band as provided with my improvements. Fig. 3 is a perspective view of a band removed from the projectile. Fig. 4 is a cross section taken on a supposed line running through the band-seat and showing how my improvements may be effected.

It is well known that in firing shells, shot, or other projectiles provided with copper bands, as before stated, the band is liable to become loose or slip, so that in its rotary motion after leaving the gun the projectile is caused to tumble and fail to go forward in a straight line. To prevent this, it has been proposed to score the band-seat by means of a chisel, making cuts or nicks across the seat, and to allow the copper to be pressed into these nicks, and various other means have been proposed for engaging the band to keep it from turning; but the difficulty of doing this renders it uncertain of performing the work perfectly, and if it is not done perfectly and the copper band is not perfectly tight before the projectile is fired the rotary motion given to the projectile by the rifled bore in the gun is retarded, with the resultant mischief already set forth. By my improvements the said defect or mischief is remedied, the

said improvements consisting in swaging up from the seat a, formed in the projectile A, a number of fins o, surrounding holes 0, made by forming the fins. Owing to the nicks being small, isolated from each other, and necessarily having edges more or less ragged and sharp, they bite into and hold the copperband with greater security than would be the case were there employed straight cuts across the score or knurled surface composed of isolated raised, and depressed surfaces.

In Fig. 4 I have shown a way in which my improvements may be carried into effect and also indicating the character of said improvements. A suitably-constructed swage or punch (not shown) having a rounded or other properly shaped point will be set upon the band seat a and inclined in the direction in which it is supposed that the projectile A will have a tendency to turn by reason of the rifiing of the gun, which direction is indicated by the arrow 2. By a stroke from a hammer or other tool upon the swage the latter will be driven into the metal and turns out a fin 6 around the depression or hole 0 thus formed, so that by a slight turn or tendency of the band to turn the fin will cut into the copper, filling the hole or depression 0 in front of it and fastening the band most securely and with certainty in its groove.

I claim- 1. A projectile provided with a band groove or score having the seat for the band constructed with numerous small holes or depressions swaged therein, and fins formed from the displaced metal surrounding the said depressions or holes.

2. The combination, of a band, witha projectile provided with a score, to receive the band, the seat for the band in said score having numerous fins swaged up from the metal;

ELIAS M. JOHNSON.

Witnesses:

ANNIE NIEBRUGGE, J. J. MCKELVEY.