IMPROVED METALLIC CARTRIDGES
Year: 1875

page_text: LETTERS PATENT to William Brookes, of 62, Chancery Lane, in the
County of Middlesex, Patent and Registration Agent, for the In-
vention of "IMPROVED METALLIC CARTRIDGES."—A communication from
abroad by Alfred Charles Hobbs and Jerome Orcutt, both of
Bridgeport, Connecticut, in the United States of America.
Scaled the 28th May 1875, and dated the 13th January 1875.
PROVISIONAL SPECIFICATION left by the said William Brookes at
the Office of the Commissioners of Patents, with his Petition, on
the 13th January 1875.
I, WILLIAM BROOKES, of 62, Chancery Lane, in the County of
Middlesex, Patent and Registration Agent, do hereby declare the nature
of the said Invention for "IMPROVED METALLIC CARTRIDGES," (communi-
cated to me from abroad by Alfred Charles Hobbs and Jerome Orcutt,
both of Bridgeport, Connecticut, in the United States of America,) to
be as follows :-

page_text: surface of the cup and vac
tho gas penetrating between the cup and casc in firing.
BISKY
The Invention is applicable to that class of metallic cartridge caso
required to be re-enforced by an inside cup.
In the accompanying Drawings Figure 1 represents a side clevation
of a case for a cartridge with the baso thereof in section, and having the
improvements applied thereto; Figuro 2, a cross section of Figure 1;
Figure 3, a plan of the interior of a cup; Figuro 4, a longitudinal
section of the cup representing the improvement of an annular groove
on the exterior thercof.
A represents a cartridge case, of ordinary construction, of drawn metal,
and having a recess 6 to receive the percussion cap or fulminator to
explode the charge of powder. To this casc A is fitted in the usual
manner an interior re-enforce cup B for the purpose of strengthening
the base and head of the case to better resist the force of the charge of
powder in firing. This re-enforce cup B is swaged into place by means
of punch and dic in the usual manner so as to fit tightly against and
conform to the interior of the base of the case in order to prevent the
gas finding its way between them, as well as to give additional strength
thereto; and to render the cup still more effective against the penetration
of gas behind it an annular groove c is formed on the exterior, which
when the cup is swaged into place in the base of the case forms an
annular recess between them, which in practice is found to entirely
prevent the entrance of gas behind the cup, thereby loosening and
rendering it of little or no assistance in supporting the base of the case.
This cup with its annular groove or recess c, when properly swaged into
position, as shown in the accompanying Drawings, forms an air-tight
chamber, into which the gas does not penetrate. A cartridge case
having the cup B of the usual form without the air-tight chamber
formed by the groove c, when well mado, the gas in many instances will
not penetrate between the case and it, and many very excellent cases are
so made, but with the slightest variation from a certain texture of metal;
in such construction of a case lack of proper swaging of the cup therein
and many other contingencies to which the manufacture of cases for
cartridges are liable, unless special provision is made to absolutely
prevent, there is constant danger of the gas forcing its way between
this ordinary cup and case, thereby injuring tho cartridge in such

page_text: manner as only to be ascertained when fired, and too late to repair
damages. These disastrous contingencies are avoided in the provision of
the annular groove or recess in the cup herein described.
The method of making and form of groove are not essential, but the
configuration represented in the annexed Drawings is found in practice
to effect the desired object.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Brookes in the Great Seal Patent Office
on the 9th July 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
BROOKES, of 62, Chancery Lane, in the County of Middlesex, Patent
and Registration Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Thirteenth day of January, in the
year of our Lord One thousand eight hundred and seventy-five, in
the thirty-eighth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said William Brookes, Her special
license that I, the said William Brookes, my executors, administrators,
and assigns, or such others as I, the said William Brookes, my executors,
administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, oxercise, and
vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVED
METALLIC CARTRIDGES," (commuuicated to me from abroad by Alfred
Charles Hobbs and Jerome Orcutt, both of Bridgeport, Connecticut, in
the United States of America,) upon the condition (amongst others) that
I, the said William Brookes, my executors or administrators, by an
instrument in writing under my, or their, or one of their hands and
seals, should particularly describe and ascertain the nature of the said
Invention, and in what manner the same was to be performed, and
cause the samo to be filed in the Great Seal Patent Office within six
calendar months next and immediately after the date of the said Letters.
Patent.
i

page_text: NOW KNOW YE, that I, the said William Brookes, do hereby declare
the nature of the said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say :-
The Invention consists in forming an annular groove or recess in the 5
re-enforce cup in a cartridge case, by which a space between the exterior
surface of the cup and the inner surface of the case is made to prevent
the gas penetrating between the cup and case in firing.
The Invention is applicable to that class of metallic cartridge case
required to be re-enforced by an inside cap.
But that the Invention, as communicated to me, may be the better
understood, I will by the aid of the accompanying Drawings proceed to
describe means employed in carrying the same into effect.
DESCRIPTION OF THE DRAWINGS.
1
In the accompanying Drawings Figure 1 represents a side elevation 1
of a case for a cartridge with the base thereof in section, and having the
improvements applied thereto; Figure 2, a cross section of Figure 1;
Figure 3, a plan of the interior of cup; Figure 4, a longitudinal
section of the cup representing the improvement of an annular groove
on the exterior thereof.
2
A represents a cartridge case of ordinary construction, of drawn metal,
and having a recess 6 to receive the percussion cap or fulminate to
explode the charge of powder. To this case A is fitted in the usual
manner an interior re-enforce cup B for the purpose of strengthening
the base and head of the case to better resist the force of the charge of 2
powder in firing. This re-enforce cup B is swaged into place by means
of punch and die in the usual manner so as to fit tightly against and
conform to the interior of the base of the case in order to prevent the
gas finding its way between them, as well as to give additional strength
thereto; and to render the cup still more effective against the penetration 8
of gas behind it an annular groove c is formed on the exterior, which
when the cup is swaged into place in the base of the case forms an
annular recess between them, which in practice is found to entirely
prevent the entrance of gas behind the cup, thereby loosening and
rendering it of little or no assistance in supporting the base of the case. 8
This cup with its annular groove or recess c when properly swaged into

page_text: position, as shown in the accompanying Drawings, forms an air-tight
chamber into which the gas does not penetrate. A cartridge caso
having the cup B of the usual form without the air-tight chamber
formed by the groove c, when well made, the gas in many instances will
not penetrate between the case and it, and many very excellent cases
are so made; but with the slightest variation from a certain texture of
metal, in such construction of a case, lack of proper swaging of the cup .
therein and many other contingencies to which the manufacture of cases
for cartridges are liable, unless special provision is made to absolutely
prevent, there is constant danger of the gas forcing its way between this
ordinary cup and case, thereby injuring the cartridge in such manner as
only to be ascertained when fired, and too late to repair damages. These
disastrous contingencies are avoided in the provision of the annular
groove or recess in the cup herein described.
The method of making and form of groove are not essential, but the
configuration represented in the annexed Drawings is found in practice
to effect the desired object.
Having thus described the Invention as communicated to me, I would
have it understood that what I claim is, the improvements in metallic
cartridges whereby the case is formed with an interior re-enforce cup,
such cup having an annular groove or recess to prevent the penetration
of gas between the said cup and case, constructed.substantially as herein
set forth.
In witness whereof, I, the said William Brookes, have hereunto
set my hand and seal, this Eighth day of July, in the year