Improvements relating to Rim-fire Cartridges.
Year: 1894

page_text: Date of Application, 22nd Nov., 1894
Complete Specification Left, 22nd Aug., 1895-Accepted, 28th Sept., 1895
PROVISIONAL SPECIFICATION.
Improvements relating to Rim-fire Cartridges.
I. THOMAS ANDREWS, of 31 New Road, Woolwich, in the County of Kent,
Gun Maker, do hereby declare the nature of this invention to be as follows:-
My invention relates to rim-fire cartridges and is chiefly designed to render the
same more sensitive to the action of the firing-pin or striker of a fire-arm, and to
facilitate the manufacture of such cartridges.
For this purpose I make the shells or cases of the said cartridges with their
heads or bases dished, recessed or otherwise formed with an inwardly extending
central part or projection, so that the said dished part or projection is surrounded
by an annular channel or space in the interior of the head or flange of the
cartridge shell or case, into which annular channel or space the charge of
fulminate of mercury or other fulminating composition or priming can be very
readily introduced.
By making the shell or case of rim-fire cartridges with a dished base in the
manner above mentioned, many advantages are secured; for example, in loading
the cartridge, a sufficient quantity of the fulminate or priming to fill or partly fill
the said annular channel or space, can be simply poured into the shell or case when
standing upright upon its base, and the said fulminate or priming will then be
displaced by the aforesaid dished part or projection and thereby caused to run into
the said channel or space, thus forming a ring of the fulminate or priming without
the necessity for any further operation. Moreover the firing of the cartridge is
rendered more certain, as the firing-pin or striker of the fire-arm has only to act
on the narrow ridge of the bead or ring of metal forming the exterior of the said
annular channel, instead of on the flat surface of the head as in the rim-fire
cartridges hitherto constructed.
In making cartridges according to my said invention, the said inwardly extending
portion or displacer is preferably formed by dishing or recessing the head or base
of the shell or case by means of stamping tools or punches adapted for the purpose;
the said inwardly extending portion may, however, be formed in any other suitable
manner, for instance by drawing the outer portions of the head of the cartridge
case or shell whilst leaving the centre of the bead or base of the desired thickness
and shape.
Dated the 2nd d... nê Naomhan 1801
COMPLETE SPECIFICATION.
Improvements relating to Rim-fire Cartridges.
1, THOMAS ANDREWS, of 31 New Road, Woolwich, in the County of Kent,
Gun Maker, 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 rim-fire cartridges and is chiefly designed to render the
improvements relating to
I, THOMAS ANDREWS, of 31 New Road, Woolwich, in the County of Kent,
Gun Maker, 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 rim-fire cartridges and is chiefly designed to render the

page_text: same more sensitive to the action of the firing-pin or striker of a fire-arm, and to
facilitate the manufacture of such cartridges.
For this purpose I make the shells or cases of the said cartridges with their
heads or bases dished, recessed or otherwise formed with an inwardly extending
central part or projection, so that the said dished part. or projection is surrounded
by an annular channel or space in the interior of the head or flange of the
cartridge shell or case, into which annular channel or space the charge of
fulminate of mercury or other fulminating composition or priming can be very
readily introduced.
By making the shell or case of rim-fire cartridges with a dished base in the
manner above mentioned, many advantages are secured; for example, in loading
the cartridge, a sufficient quantity of the fulminate or priming to fill or partly fill
the said annular channel or space can be simply poured into the shell or case when
standing upright upon its base, and the said fulminate or priming will then be
displaced by the aforesaid dished part or projection and thereby caused to run into
the said channel or space, thus forming a ring of the fulminate or priming without
the necessity for any further operation. Moreover the firing of the cartridge is
rendered more certain, as the firing-pin or striker of the fire-arm has only to act
on the narrow ridge of the bead or ring of metal forming the exterior of the said
annular channel, instead of on the flat surface of the head as in the rim-fire
cartridges hitherto constructed.
In the accompanying drawing I have shown how my said invention can be
conveniently carried into practice, Figure 1 being a side elevation partly in
longitudinal section and Figure 2 a transverse section on the line a, a, Figure 1.
a is the inwardly extending portion or displacer and
is the annular channel or space surrounding the said inwardly extending
portion.
In making cartridges according to my said invention, the said inwardly extending
portion or displacer is preferably formed by dishing or recessing the head or base
of the shell or case by means of stamping tools or punches adapted for the purpose;
the said inwardly extending portion may, however, be formed in any other suitable
manner, for instance by forming the outer portions of the head of the cartridge
case or shell whilst leaving the centre of the head or base of the desired thickness
and shape.
I may vary the form or shape of the dishing or recessing in the head of my
improved cartridge case or shell without departing from my invention. For
instance may make the annular channel of V-shape or of any other suitable
shape.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
:-
The improved cartridge case or shell provided with a dished or recessed head
and an internal annular channel or space substantially as herein described and
shown.
T
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20
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1005