Improvements in Band-seats for Projectiles.
Year: 1892

page_text: Date of Application, 15th Jan., 1892-Accepted, 20th Feb., 1892
COMPLETE SPECIFICATION.
Improvements in Band-seats for Projectiles.
I, WILLIAM HALE DRIGGS, a Lieutenant in the United States Navy, residing
at No. 1146, 17th Street, Washington, in the District of Columbia, United States
of America, do hereby declare the nature of this invention and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement :-
My invention relates to certain improvements in the method of securing soft
metal bands on shells and projectiles, and has for its object to provide simple and
efficient means for securing the band firmly in place.
The improvements consist in rolling, stamping, pressing or cutting into the body
of a projectile, a series of cross lines or circles into which the soft metal forming the
band is forced by pressure; and of such other details of construction as will be
hereinafter described and specifically pointed out in the claims.
Reference is had to the accompanying drawings, wherein the same parts are
indicated by the same letters.
Fig. 1 represents a side elevation of a shell or projectile constructed in accordance
with my invention, the band and a portion of the shell being broken away to more
clearly illustrate the improvement.
Fig. 2 represents a similar view of a shell or projectile having the grooves cut
into the surface of the shell.
Fig. 3 is a similar view of a slightly modified form in which the indentations are
of circular form.
Fig. 4 is an enlarged detail view showing a portion of the band seat and fillet.
A designates a shell, having an annular groove or band scat B formed in the
surface thereof and extending around its body in rear of the centre.
Within the band seat B, I form a series of grooves or indentations b, crossing
each other at angles and forming a knurled seat for the band C, as shown in
Figs. 1 and 2.
The band C, is placed in the seat so formed and subjected to pressure sufficient
to force the soft metal of the band into the interstices of the "knurling" of the
seat and thus secure the band firmly in position.
In Fig. 1 the band seat is shown as a groove formed in the surface of the shell
and in lieu of making the shoulders 62, formed by the said groove, angular in form,
I prefer to have them curved to form a fillet 63, for the purpose of giving additional
strength at this point.
In Fig. 2 I have shown the "knurling" formed upon the surface of the shell as
at b, no groove being cut in the shell. In many instances this will be found
sufficient, and will obviate the necessity of forming a groove around the shell.
In Fig. 3 is shown a slightly modified form in which in lieu of "knurling " the
band seat I make the indentations in the form of circular indentations as shown
at, the band C, being forced into the indentations by pressure as in the previous
instance.
By "knurling" the band seat and forcing the metal of the band into the inter-
stices of the "knurling "under pressure, as hereinbefore described, I provide a
simple means by which the bands upon shells and projectiles may be secured firmly
and rigidly in place.
Having thus described my invention, what I claim as new, is :-
1. A shell or projectile having two or more series of depressed spiral lines or
shallow grooves formed upon its surface, and a band of soft metal thereon, as and

page_text: 2. A shell or projectile, the band seat of which is provided with numerous
shallow indentations or depressions for the reception of the soft metal of the band,
as and for the purposes described.
3. A shell or projectile having a soft metal band for giving it rotation, and a
band seat provided with numerous indentations or depressions of sufficient depth to
receive the soft metal of the band, as and for the purposes described.
4. In a shell or projectile, a fillet at each end of the annular score forming the
band seat, as and for the purposes described.
Dated this 15th day of January 1892.
EDWARDS & Co.,
Agents for the Applicant.