Improvements in Projectiles.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Projectiles.
I, ROBERT ABBOTT HADFIELD, of Hecla Works, Sheffield, in the County of York,
Steel Manufacturer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to projectiles furnished with caps intended to increase
the efficiency of such projectiles when fired against hard substances such as
hardened steel plates and has reference to an improved method of fastening the
caps to the projectiles without material weakening such as is liable to result from
the adoption of modes of fastening that involve the cutting or forming of grooves
in the projectiles.
In carrying out this invention two, three, or more indentations or concavities
are formed in the ogive or head of the projectile at a distance from the point
preferably corresponding with the extreme. rearward edge of the cap that is
intended to be fixed on the projectile. Into these indentations or concavities
portions of the edge of the cap (or of the cap) which at this point is formed
of suitable thickness, is pressed, thus securing the cap firmly in position, in a
manner adapted to prevent it from rotating on the point or head of the projectile
during flight. The indentations or concavities may be formed in the projectile
in any suitable manner; conveniently they may be cut by means of a circular
milling cutter with rounded edge, but if it is intended to attach caps by this
method to projectiles which have been already hardened such indentations or
concavities may be formed with an emery or other suitable grinding wheel..
of
An advantage of my present invention is that it will enable caps
form to be readily and effectually applied to existing projectiles.
any
suitable
I, ROBERT ABBOTT Hadfield, of Hecla. Works, Sheffield, in the County of York,
Steel Manufacturer, do hereby declare the nature of this invention and in what
[Price SdA

page_text: manner the same is to be performed to be particularly described and ascertained
in and by the following statement:-
This, invention relates to projectiles furnished with caps intended to increase
the efficiency of such projectiles when fired against hard substances such as
hardened steel plates and has reference to an improved method of fastening the
caps to the projectiles without material weakening such as is liable to result from
the adoption of modes of fastening that involve the cutting or forming of grooves
in the projectiles.
In carrying out this invention two, three, or more indentations or concavities
are formed in the ogive or head of the projectile at a distance from the point
preferably corresponding with the extreme rearward edge of the cap that is
intended to be fixed on the projectile. Into these indentations or concavities
portions of the edge of the cap (or of the cap) which at this point is formed
of suitable thickness, are pressed, thus securing the cap firmly in position, in a
manner adapted to prevent it from rotating on the point or head of the projectile
during flight. The indentations or concavities may be formed in the projectile
in any suitable manner. Conveniently they may be cut by means of a circular
milling cutter, with rounded edge; but, if it is intended to attach caps by this
method to projectiles which have been already hardened, such indentations or
concavities may be formed with an emery or other suitable grinding wheel...
An advantage of my present invention is that it will enable caps of any suitable
form to be readily and effectually applied to existing projectiles.
In the accompanying drawings,
Fig. 1 shows an example of a projectile adapted to receive a cap in accordance
with this invention, and
Fig. 2 shows the cap secured in place on the projectile.
1, 1, are indentations or concavities formed in the head 2 of the projectile,
and 3, 3 are portions of the metal of the cap that are pressed into the said
indentations or concavities.
Although I have shown an example by way of illustration, it is to be clearly
understood that I do not limit myself to the form of the projectile, or to the form
of indentation or concavity, or the shape of cap represented in the drawing, as
these may evidently be more or less varied according to requirement.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is: -
.
1. The method of attaching caps to projectiles by forming indentations or
concavities in the projectile and pressing or forcing portions of the metal of the
cap into the said indentations or concavities, substantially as set forth.
2. Projectiles having caps attached to them substantially as described with
reference to and shewn in the accompanying drawings.
Dated this 974h love of Tuna 1900