IMPROVEMENTS IN CARTRIDGE CASES
Year: 1878

page_text: LETTERS PATENT to Samuel Blakemore Allport, of Birmingham, in the County
of Warwick, Gun Manufacturer, for the Invention of "IMPROVEMENTS IN
CARTRIDGE CASES."
Sealed the 4th April 1879, and dated the 15th October 1878.
PROVISIONAL SPECIFICATION left by the said Samuel Blakemore Allport
at the Office of the Commissioners of Patents on the 15th October 1878.
SAMUEL BLAKEMORE ALLPORT, of Birmingham, in the County of Warwick, Gun
Manufacturer. IMPROVEMENTS IN CARTRIDGE CASES."
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This Invention consists in forming cartridge cases in such manner that the
capacity of the case when charged shall be considerably less than that of the same
case when exploded. This I effect by corrugating, fluting, or reeding the case
either vertically, horizontally, or spirally, or in any other suitable direction, or by
forming the case of angular section capable of expanding by the force of the
explosion into a cylindrical form.
The cases may be reformed for refilling after each discharge, and one mode in
which I effect this is by pressing the case through a die consisting of a block of
metal pierced through the centre, and provided with rollers set round the centre
aperture in such manner that, converging to one common centre, the case in passing
through the aperture is compressed by the rollers into the desired form, the rollers
revolving during the passage of the case between them.
The necessary force may be applied by a lever to press the case through the
rollers.
Mounting these rollers slightly askew will cause them to revolve obliquely, and
thus to produce a spiral groove or reed upon the cartridge case.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Samuel Blakemore Allport in the Great Seal Patent Office on the
10th April 1879.
SAMUEL BLAKEMORE ALLPORT, of Birmingham, in the County of Warwick, Gun
Manufacturer. "IMPROVEMENTS IN CARTRIDGE CASES."
This Invention consists in forming cartridge cases in such manner that the
capacity of the case when charged shall be considerably less than that of the same
case when exploded.
This I effect by corrugating, fluting, or reeding the case either vertically,
horizontally, or spirally, or in any other suitable direction, or by forming the case
of angular section capable of expanding by the force of the explosion into a cylin-
drical form.
The cases may be reformed for refilling after each discharge, and one mode in
which I effect this is by pressing the case through a die consisting of a block of
metal pierced through the centre, and provided with rollers set round the centre
aperture in such manner, that converging to one common centre, the case in passing
through the aperture is compressed by the rollers into the desired form, the rollers
revolving during the passage of the case between them. The necessary force may
be applied by a lever to press the case through the rollers. Mounting these rollers
slightly askew will cause them to revolve obliquely, and thus to produce a spiral
groove or reed upon the cartridge case.
DESCRIPTION OF THE DRAWINGS.
(Figure 1) is an elevation of a cartridge case formed according to my Invention
and ready for charging.
(Figure 2) is a cross section of the same on the line A, B.
(Figure 3), an elevation of the same case after discharge.
(Figure 4), a cross section of the same on the line C, D.
In the above Drawings it will be seen that the depressions (a, a,) shewn in Figure
1 and 2 are, by the force of the explosion on discharge forced outwards, and the
case assumes the form of a regular cylinder, as shown in Figures 3 and 4, by which
action is formed a case of greater capacity than that which contained the original
charge.
Having thus described the nature of the said Invention, and the manner in which
the same is to be performed,-
I claim the improvements in cartridge cases by forming them corrugated, fluted,
or reeded vertically, horizontally, or.spirally, or of any other form admitting of the
same effect resultant upon the discharge of the cartridge, namely, the expansion of
the case into a greater capacity than that which it originally held when charged.
In witness whereof, I, the said Samuel Blakemore Allport, have hereunto set
my hand and scal, this Thirty-first day of March, in the year of our Lord
One thousand eight hundred and seventy-nine.
SAMUEL BLAKEMORE ALLPORT. (L.S.)