Improvements in the Construction of Large Steel Punches.
Year: 1893

page_text: Date of Application, 28th Feb., 1893
Complete Specification Left, 25th Nov., 1893-Accepted, 13th Jan., 1894
. PROVISIONAL SPECIFICATION.
Improvements in the Construction of Large Steel Punches.
We, GEORGE KYNOCH AND COMPANY LIMITED, and EDWARD JONES, both
of Lion Works, Witton, in the County of Warwick, Manufacturers; do hereby
declare the nature of this invention to be as, follows :-
Our invention relates to the construction of large steel punches such as are used.
in heading, indenting, drawing and other operations in cartridge case and other
metal manufactures. Considerable difficulty is found in tempering large punches:
and many large steel punches "fly" in tempering or break up and crack while in
use after tempering.
I
The liability to crack or fly is due to the intense local strains set up in the large
mass of steel during the tempering or hardening operations and the object of our
invention is to so construct punches as to obviate this difficulty and to produce
reliable, hardened and tempered steel punches with certainty and without waste.
Our invention consists in forming our punches in separate sections or parts which
when combined together form our complete punch.
:
By so constructing our punches we are enabled to deal with moderate masses of:
metal which can be easily hardened and tempered without producing dangerously!
intense local strains.
In carrying our invention into effect as applied to a punch adapted for use while
indenting or heading large cartridge cases, we construct a suitable number of similar
cylindrical pieces of steel each piece turned all over and each having a carefully
bored out central bole passing through the axis of the cylinder. We shape and!
turn the face and end of one of the said cylindrical pieces to the configuration.
desired to produce the shape of the interior of the cartridge case to be indented or
headed, and we fill up the hole hereinbefore described at the upper end by a suitable
steel plug laid or pressed into place.
Within the central holes.we fix accurately turned steel dowel pins, each pin
projecting partly into two cylindrical pieces and each preferably butting on the
next dowel pin in series. We thus build up a punch of the desired length of separate
pieces firmly.connected together by central pins, or in some cases one dowel pin only:
may be used connecting all the pieces together.
We hold the lower piece in a suitable bolster or connection to a bolster.
We prefer the adjacent faces of the cylindrical pieces to be truly flat, each pair!
of faces accurately fitting, and we also prefer to round off all edges, both external
edges of the cylindrical pieces and the edges of the holes. Indeed, we avoid'
sharp edges wherever possible as it is well known that cracks often originate at
sharp edges or corners.
f.
a
After carefully turning, facing and boring the separate pieces intended to form
punch, we harden and temper the said separate pieces. From the pieces 80'
hardened and tempered we build up our complete punch and when necessary we
finish the hardened surfaces by grinding or other known treatment.
23.
Instead of forming our separate cylindrical pieces with flat faces we may turn
alternate plugs and recesses to fit into each other and hold the punch together either
with or without the central holes and dowel pins..
The pieces may be held together by other devices and they may form punchesi
of other than cylindrical:configuration without departing from our invention.
E
Dated this 27th day of February 1893.
-
puhému ná gum vMARKS & CLERK
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page_text: Improvements in the Construction of Large Steel Punches.
We, GEORGE KYNOCH AND COMPANY LIMITED, and EDWARD JONES, both
of Lion Works, Witton, in the County of Warwick, Manufacturers, 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:-
Our invention relates to the construction of large steel punches such as are used
in heading, indenting, drawing and other operations in cartridge case and other
metal manufactures. Considerable difficulty is found in tempering large punches
and many large steel punches "fly "in tempering or break up and crack while in
use after tempering.
The liability to crack or fly is due to the intense local strains set up in the large
mass of steel during the tempering or hardening operations and the object of our
invention is to so construct punches as to obviate this difficulty and to produce
reliable, hardened and tempered steel punches with certainty and without waste.
Our invention consists in forming our punches in separate sections or parts which
when combined together form our complete punch.
By so constructing our punches we are enabled to deal with moderate masses of
metal which can be easily hardened and tempered without producing dangerously
intense local strains.
Referring to the accompanying sheet of drawings:-
Figure 1 is a section through one of our built up punches in which the sections
or parts are united by dowel pins.
Figure 2 is a similar section showing such section or part arranged with a
projecting bung fitting into a recess in the next.
In carrying our invention into effect as applied to a punch adapted for use while
indenting or heading large cartridge cases, we construct a suitable number of
similar cylindrical pieces of steel as shown at A, B, C, D, E and F of Figure 1
each piece turned all over and each having a carefully bored out central hole
passing through the axis of the cylinder. We shape and turn the face and end of
one of the said cylindrical pieces as A to the configuration desired to produce the
shape of the interior of the cartridge case to be indented or headed, and we fill up
the hole herein before described at the upper end by a suitable steel plug A laid or
pressed into place. Within the central holes we fix accurately turned steel dowel
pins A B C D and E¹ Figure 1, each pin projecting partly into two cylindrical
pieces and each preferably butting on the next dowel pin in series. We thus build
up a punch of the desired length of separate pieces as shown at Figure 1 firmly
connected together by central pins, or in some cases one dowel pin only may be
used connecting all the pieces together.
We hold the lower piece F in a suitable bolster or connection to a bolster.
We prefer the adjacent faces of the cylindrical pieces to be truly flat, each pair
of faces accurately fitting, and we also prefer to round off all edges, both external
edges of the cylindrical pieces and the edges of the holes. Indeed, we avoid
sharp edges wherever possible as it is well known that cracks often originate at
sharp edges or corners.
After carefully turning, facing and boring the separate pieces intended to form
a punch, we harden and temper the said separate pieces. From the pieces so
hardened and tempered we build up our complete punch and when necessary we
finish the hardened surfaces by grinding or other known treatment.
Instead of forming our separate cylindrical pieces with flat faces we may turn
plugs as A¹ B'C' D and E Figure 2 and recesses into which they fit to hold the
punch together either with or without the central holes and dowel pins.

page_text: The pieces may be held together by other devices and they may form punches of
other than cylindrical configuration without departing from our invention.
Having now particularly described and ascertained the nature of our said inven-.
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. Constructing large steel punches in separate sections or parts which when
combined together form the complete punch so as to reduce the liability to crack or
fly in tempering substantially as and for the purposes hereinbefore described.
2. The construction of steel punches substantially as hereinbefore described with.
reference to Figures 1 and 2 of the accompanying drawings.
Dated this 24th day of November 1893.
MARKS & CLERK,
13, Temple Street, Birmingham, Agents for the Applicants.