An improved Tool for Punching out Circular, Oval, or other shaped Apertures in Plates.
Year: 1888

page_text: Date of Application, 10th Feb., 1888
Complete Specification Left, 22nd Aug., 1888
Complete Specification Accepted, 5th Oct., 1888
1
An improved Tool for Punching out Circular, Oval, or other shaped
Apertures in Plates.
1, ARCHIBALD BUCHANAN, of No. 29, Waterloo Place, North Shields, in the county
of Northumberland, Manager of Iron Shipbuilding Yard, do hereby declare the nature
of the said invention to be as follows:-
My invention consists of a tool, which can be readily attached to any punching
achine without the slightest alteration and by means of which doorways, man holes,
ilge holes or other apertures of circular, oval or other shapes may be clearly cut out,
without need of the special and costly machines sometimes employed for such work.
The tool consists of a punch with a circular shank which at its lower end is reduced to
an oblong shape with rounded ends and is carried in a "punch-box" or "holder,"
arranged to replace the ordinary "punch-box" or "holder," on the bottom end of the
slide ram of the machine, taking the same bolts. The punch is secured in the
"holder" so that whilst it cannot come out it can be rotated on its axis by means of
a hand spanner.
Above the point of the punch is a projecting shoulder through which
passes a loose guide pin which can be fixed in working or idle position by a set screw.
The die is carried in a hox or "holder" which is made to replace the ordinary "die-
holder" taking the same bolts and is so secured in the holder that it can be rotated on
its axis simultaneously with the punch by means of the guide pin on the latter which
when the punch is working passes through the die holder. When required to cut in
a straight line, us the sides of a door aperture, the punch has only its reciprocating
motion but when a curve is to be cut, as the arched head of a door, or round the circle
or oval of such shaped apertures, the punch is rotated on its axis by means of the
spanner so as to cause its cutting point to follow the marked line and the guide pin
at the same time rotates the die on its axis to correspond with the punch.
The guide pin forms a stop and keeps the line of the aperture being cut and, when
the work is finished, the guide pin being lifted in the shoulder of punch the plate can
be withdrawn from the machine and another inserted. The machine- is quickly
adapted for ordinary work by taking off the tool and fixing the ordinary punch and
die holders.
This 10th Jan of Tab 1000

page_text: COMPLETE SPECIFICATION.
An Improved Tool for Punching out Circular, Oval, or other Shaped
Apertures in Plates.
I, ARCHIBALD BUCHANAN late of No. 29 Waterloo Place, North Shields in the
County of Northumberland, Manager of Iron Shipbuilding Yard, now of Barrow in
Furness, do hereby declare the nature of said invention and in what manner the same
is to be performed to be particularly described and ascertained in and by the following
statement:
5
My invention consists of a tool, which can be readily attached to any punching
machine without the slightest alteration and by means of which doorways, manholes,
bilge-holes or other apertures of circular, oval or other shapes may be clearly cut out
without need of the special and costly machines sometimes employed for such work.
The tool consists of a punch with a circular shank which at its lower end is reduced 1
to an oblong shape with rounded ends and is carried in a "punch-box ог "holder,"
arranged to replace the ordinary "punch-box" or "holder," on the bottom end of the
slide ram of the machine, taking the same bolts.
"
The punch is secured in the "holder," so that, whilst it cannot come out, it can be
rotated by means of a handle or spanner. Above the point of the punch is a projecting 1
shoulder through which passes a loose guide pin which can be fixed, in working or
idle position, by a set screw. The die is carried in a box or "holder" which is made
to replace the ordinary "die-holder" taking the same bolts and is so secured in the
"holder" that it can be rotated on its axis simultaneously with the punch by means
of the guide pin on the latter which when the punch is working passes through the 2
die-holder. When required to cut in a straight line, as the sides of a door aperture,
the punch has only its reciprocating motion but when a curve is to be cut, as the
arched head of a door, or round the circle or oval of such shaped apertures, the punch
is rotated on its axis by means of a spanner so as to cause its cutting point to follow
the marked line and the guide pin at the same time rotates the die on its axis to
correspond with the punch.
The guide pin forms a stop and keeps the line of the aperture being cut and, when
the work is finished, the guide pin being lifted in the shoulder of punch, the plate can
be withdrawn from the machine and another inserted. The machine is quickly
adapted for ordinary work by taking off the tool and fixing the ordinary punch and a
die holder

page_text: highest position ready for the descending stroke. Fig. 2 is a section through the
punch and guide pin on line X-X of Fig. 1 and Fig. 3 is a plan on line Y-Y of
Fig. 1 shewing the shape of point of punch and the guide pin in section and the "die"
and its "holder" in plan.
A is the punch "holder" in which the punch B is free to be revolved but secured
from coming out by the set screw C. The shank of punch has formed upon it a
projecting shoulder D in which the guide pin E is secured in working position, as
shewn, or raised to the position indicated by dotted lines and thoro secured by the set
pin or screw F. G is a spanner on the punch by which it can be revolved in the
"holder" to follow curves required to be cut in the work. The "die" H is free to
revolve in the "holder" J but is prevented from coming out by the set screw K.
The point of the guide pin E engaging with the "die" H causes it to move in the
"holder" J in unison with the punch B when punching curved work. When the
plate, in which an aperture is to be cut, is to be put into the machine the guide pin E
is raised as shewn by dotted lines clear of the cutting part of punch until a
commencement has been made to punch when it is let down and fixed in the position
shewn in which it engages with the "die" H ready to operate in curved cutting when
required but in straight cutting the "die" H is not affected by the guide pin beyond
being kept fair with the point of the punch.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what 1
claim is :-
The improved tool for punching circular, oval or other shaped apertures, capable of
being readily attached to ordinary punching machines, in which the punch being
rotated in the holder to follow the curve to be cut, causes the die to rotate in unison
with it by the action of a guide pin which can be raised above the point of the punch
to enable the work to be introduced to, or withdrawn from, the machine and to allow
the punching to be commenced with, constructed and operating substantially as shown
and described.