Improved Apparatus for Cutting Circular Holes in and Circular Plates from 'Sheet Material, such as Iron or the like.
Year: 1894

page_text: Date of Application. 22nd Aug., 1894
Complete Specification Left, 16th May, 1895-Accepted, 22nd Aug., 1895
IVY DIONA
An: Improved Apparatus for Cutting Circular Holes in and Circular
Plates from 'Sheet Material, such as Iron or the like.
I, ARTHUR TRICKETT of 756 Grimesthorpe Road in the County of York in
the City of Sheffield, Engineer, do hereby declare the nature of this invention to
be as follows:-
-
I construct of iron or steel or both a machine. by means of which one man may
readily cut out a circular hole or a circular plate to any size he may require, and
I construct it in the following manner :-
"
I take a piece of steel either cast or forged, one extremity of which is round
and 5 inches in diameter and 14" inch in thickness, and from which protrudes an
arm whose " centre is set 1" inch from "centre of round part and from which
centre it is 10" inches to the end and 12" inch in breadth, and same thickness as
round part, namely-1" inch the latter part having in the middle a hole to
receive a inch bolt, or other convenient size and a recessr cnt: underneath to
receive bolt head. The top surface of both arm and round part having a radius
of 4 inches. This part of the machine I call the "bed or "base."
"
I also take a spindle of steel 4" inch diameter and 10" inches in length and shaped
like a T the head of the T being turned 1 inch diameter and 2 inches long and
having a hole drilled through to admit the bolt which runs through the centre
of "base" the hole having a keyway cut all the length inside and " inch in breadth
and inch in depth, to admit a key, and corresponding with grove in bolt, which
runs through "base." This part I call the "spindle."
3 #
16
I also take a casting made either of steel or of malleable iron 24" inches in
height, 1" in breadth on the sides and 3 inches in length; in this casting there-is
a rectangular hole 1" x 4" inches running from top to bottom of the 21" inches,-
and is set about " inch from sides-in which hole a 4" inch square tool, drawn down
at one end to a chisel, is fixed and for working purposes is hit on the top-by-a man
striking with a hammer; in the .above hole-1" x 1" inch-the difference. of
the "inch is to allow a piece of sheet steel or iron to be placed: therein so-ns to
regulate the square tool-by a set.screw inch in diameter running from outside
of the casting from having any "play" or shake in the hole when at work. In
the other part of this casting (which I call the "tool-holder") another hole is
made-either cast or drilled from solid,-which is " inch in diameter and is 14" inch
in length (and running in opposite direction to rectangular hole)-that is the full
length of that side of the casting-so as to fit on to the "spindle," on to which at
any desired place it is fastened by a set-screw inch diameter. The bottom of
this the "tool-holder" is provided with feet 1 inch in width by + inch in depth
and running all the 3" inches in length of this side, on each side of a tunnel shaped
grove 1 inch radius so that by this means the operator may see the tool that it is
cutting in its proper place and in the desired manner.
I also take a turned bolt 4 inches in length,-excluding the head which would
he about " inch thick-this is screwed for about 18" inch, this holt is to fit the hole
in centre of "base" which would conveniently be inch; down from the screwed
end a slot or key-way would run to correspond with, and same size as the one in the
bead of the T shaped "spindle," into this slot a detachable key 14" inch in length
would be made a good fit so as to keep. the arm in one steady position when:st

page_text: work; the nut for this bolt is a winged one, that is, a nut with two wings or arms
by which it can be screwed on to the bolt by the thumb and finger.
The machine is worked in the following manner, a hole is drilled in the sheet to
admit the inch bolt from the "base," the "spindle" is then put on to the "bolt" and
attached thereto by the key fitting in the key-ways on the bolt and in the spindle's
hole, the winged nut is next adjusted, not too tightly, but to keep the material
worked upon from jumping, then the "tool holder," holding the chisel is fixed in
any desired position-according to the size of hole required-on the "spindle," by
means of the inch set-screw provided for the purpose of tightly fastening it
thereto; everything now being fixed the operator strikes the chisel head with his
hammer and gradually works his sheet of material round until only the plate the
desired size remains standing on the machine, and is then taken off by means of
unscrewing winged nut and lifting off the "spindle" to which the "tool holder" is
attached.
1
ARTHUR
TRICKETT,
Of 756 Grimesthorpe Road, in the County of York,
in the City of Sheffield, Engineer.
An Improved Apparatus for Cutting Circular Holes in and Circular
Plates from Sheet Material, such as Iron or the like.
I, ARTHUR TRICKETT of 756 Grimesthorpe Road in the County of York in
the City of Sheffield, 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 :--
I construct of iron or steel, or both, an apparatus by means of which one man
may readily cut out a circular hole, or a circular plate, to any size he may require,
from sheet material, and I construct it in the following manner-
I take a piece of steel either cast or forged, Fig. 1 one extremity of which is
circular, and 5 inches in diameter and 1 inches in thickness and from which
protrudes, at right angles, an arm 7 inches long, 1 inches thick and 14 inches
broad, In the centre of the circular extremity a hole is made to receive a " inch
bolt or other convenient size, having underneath a recess to receive bolt head.
The top surface of casting-or forging—having a radius of—preferably-4+" inches.
This part of the apparatus I call the "bed
"base."
or
"
I also take a square spindle, or bar, Fig. 2 which when finished is inch in
diameter and 10 inches in length and shaped almost like a T-with its head bent
backward which head is turned about 1" inches diameter and 24" inches long, and
having a hole bored through it to admit the bolt which runs through the "base,"
this head having in the back side a hole bored to admit an adjustable set-screw,
which would conveniently be inch in diameter, the head is bent at right angles
to the other part of the spindle, with a centre of 11 inch. This part 1 call the
"bar."
I also take a casting of steel, or preferably, malleable iron, Fig. 3 and which
I call the "tool holder," 24 inches in height, 12" inch in breadth on the sides, and
3 inches in length;-Fig 7 being the tool-in this casting there is a rectangular
hole 1" inch by " inch, running from top to bottom of the 24 inches, and is set about
inch from the sides, in which hole a " inch square chisel or tool works when
completed, which is struck on the head by the person working it, with a hammer,
by the side of this tool, and in the "inch surplus space a piece of iron or the like
(as shown) is inserted to replace any shake or "play in the tool when at work,
and is kept in the desired position.by a set-screw, Fig. 6 which may conveniently
"

page_text: be" inch, which is provided with a lock-nut, so as not to jar loose, this arrange-
ment, for convenience is fixed in the front side of the "tool holder "; in another
part of this casting another hole exists which is "inch square and 13" inch long,
and running in the opposite direction to the rectangular hole-it is the full length
of that side of the casting-and is a sliding fit on the "bar," on to which at any
desired place it is fastened by a set-screw, which may be " inch in diameter;-the
bottom of this "tool holder" is provided with feet " inch square, and running the
3" inches of length of this side, on each side of a tunnel shaped grove of 1" inch
radius, so that by this arch the operator may see where to set the tool, and also
that it is working in a satisfactory manner.
I also take a turned bolt, Fig. 4, preferably *" inch in diameter, and about
5 inches long, inclusive of the head, this is screwed for about 1" inch, this bolt
tightly fits the hole in the "base," and fits slidingly in the hole in head of "bar,"
on the bolt a flat is filed to receive end of set-screw, from the head of the
bar," and thereby when screwed tight with a spanner thereto, keeping the "bar"
parallel over the arm of "base when at work; the nut for this bolt is provided
with two wings or arms Fig. 5 so that it may be readily screwed into position on
the bolt by the thumb and finger, and is used to push the material worked upon into
position, so that the set-screw on the head of the "bar" may be more properly
adjusted.
"
The apparatus is worked in the following manner; a hole is drilled in the
material to be cut, to admit the "bolt" standing from the "base," the winged nut
is then screwed on to the "bolt" and adjusted to position to keep the material
from jumping when at work, the "bar" is then screwed tightly to the "bolt," and
the "tool holder" is fastened to the "bar" to cut the desired size of circle, the
tool is then put in the "holder" and adjusted from all shake by the set-screw
aforesaid provided; it is then struck on the head by the operator with a hammer,
and the material gradually moved away with the other hand from the tool, as it is
sufficiently cut, until only the required circle is left on the apparatus, when the
"bar" is then taken off and the material removed.
The tool is also steadied by a handle having a square eye loosely fixed below
the head of the tool.
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:
A foot of steel or the like, as a base for the apparatus, being an arm which has a
circular end, in the centre of which end is an upright bolt adapted to support a
detachable square arm, which, fastened to the bolt by a set screw or the like, is
parallel to arm of the base or foot of the apparatus, on to which arm of bolt a
detachable projection is set and fastened, adapted so as to be a holder for the tool
at work, substantially as described and shown.
Dated this 15th day of May 1895.
ARTHUR TRICKETT,
756 Grimesthorpe Road, Sheffield.