Improvements in Cartridge-cases.
Year: 1890

page_text: Date of Application, 7th Mar., 1890
Complete Specification Left, 5th Dec., 1890-Accepted, 10th Jan., 1891
PROVISIONAL
SPECIFICATION.
Improvements in Cartridge-cases.
I, RICHARD MORRIS, of Bennett Park Blackheath, in the County of Kent, Engineer,
do hereby declare the nature of this invention to be as follows:-
Cartridge cases, as they are usually made, are punch drawn out of solid metal into
tubular form and afterwards shouldered to fit the charge chamber of the gun.
Cartridge cases have also been made of thin sheet metal bent round into tubular form
the end of the tube being secured by pressed papier maché in a base cap, but cartridge
cases so made cannot readily be shouldered to fit the charge chamber. Now,
according to my invention, I make the case consist of a tube made by bending thin
sheet metal round and secured as before in a base cap, but I make the tube taper so
that while its base or larger end fits into the base cap, its front end is of the smaller
size to receive the projectile and to fit the small bore at the inner end of the charge
chamber. Cartridge cases thus made, although they do not fit the form of the charge
chamber throughout its length, become practically fitted thereto at the moment of
firing by the pressure of the powder gas within them. Instead of using thin sheet
metal alone to form the taper tube, the sheet may have cemented to it a lining of
paper or other thin material to be interposed between the metal and the explosive
within. In some cases also I cover the sheet metal on both sides with paper or the
like, suitably varnished to provide against the action of corrosion or damp.
Dated this 7th day of March 1890.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Cartridge-cases.
1, RICHARD MORRIS, of Bennett Park, Blackheath, in the County of Kent, Engineer,
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:
Cartridge cases, as they are usually made, are punch drawn out of solid metal into
tubular form and afterwards shouldered to fit the charge chamber of the gun.
Cartridge cases have also been made of thin sheet metal bent round into tubular form
the end of the tube being secured by pressed papier maché in a base cap, but cartridge
cases so made cannot readily be shouldered to fit the charge chamber. Now,
according to my invention, I make the case consist of a tube, as shewn in section by
Fig. 1 of the accompanying drawings, made by bending thin sheet metal round and
secured as before in a base cap, but I make the tube taper so that, while its base or
larger end fits into the base cap, its frout end is of the smaller size to receive the
projectile and to fit the small bore at the inner end of the charge chamber. Cartridge
cases thus made, although they do not fit the form of the charge chamber throughout
its length, become practically fitted thereto at the moment of firing by the pressure
of the powder gas within them, as shewn in section by Fig. 2. Instead of using thin
sheet metal alone to form the taper tube, the sheet may have cemented to it a lining
of paper or other thin material to be interposed between the metal and the explosive
within. In some cases also I cover the sheet metal on both sides with paper or the
like, suitably varnished to provide against the action of corrosion or damp. The
external paper covering may be of such thickness as to make up the cartridge care to
fit or nearly to fit the charge chamber of the gun as shewn in Fig. 3. Also in some

page_text: cases, in order to give stiffness when the metal is very thin, I insert a plug P of
explosives as shown in Fig. 4 and afterwards taper the front part of the tube.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
A cartridge case consisting of a taper tube formed by bending thin sheet metal
round, secured in a base cap substantially as described.
Dated this 5th day of December 1890.
ABEL & IMRAY,
Agents for the Applicant.