Improvements in Circle Describers for Marking Work.
Year: 1897

page_text: Date of Application, 20th Feb., 1897-Accepted, 22nd May, 1897
COMPLETE SPECIFICATION.
Improvements in Circle Describers for Marking Work.
I, WILLIAM CUTTELL, of Greenwich, Ripley, in the County of Derby, Boiler
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 "Improvements in circle describers for marking work"
and is intended for the use of boiler makers, bridge makers, fitters, etc., and has. for
its object the construction of a simple form of tool which does not consist in
complicated mechanism, and is extremely quick and true in doing its work.
My invention will describe a circle with a very slight twist of the wrist, the centre of
the said circle being already given, the said circle being the diameter of a hole that
has to be punched, or drilled, in iron, steel, etc. My invention can be made in any
size varying from three eights of an inch upwards. My invention consists of a cross
handled receptacle, made of iron or the like, the opposite end from the said cross
handle to be round, and a hole drilled a distance down the centre from the said round
end, then four more holes drilled a distance down at the four quarters from the said
round end, the four said holes to be pitched from the centre according to the
diameter of the required circle, place in the centre hole a few thin round packings,
then a spiral spring made of thin steel wire to be placed in each of the five holes, then
place in each of the four outside holes a scriber, made of round steel, and set down
from about the centre, and spiked at the small end, then place in the said centre hole
the conductor, made of round steel and set down and spiked at the small end, the set
down to be about half an inch longer than the set down on the said four scribers, then
a round thin cap made of iron, or the like, with five holes drilled in it same pitch as in
the said round end of the receptacle, with two screw pins screw the said cap on the
said round end of the receptacle, to stop the four scribers and the said conductor from
projecting any more than required.
"6
In order that my invention may be clearly rendered, reference may be had to the
accompanying sheet of drawings, in which Fig. 1 is a sectional elevation " and
Fig. 2 is an external plan view of the tool at bottom-similar letters of reference are
used to indicate like parts in both views.
In constructing a tool according to my invention, I employ a cross handled
receptacle D Fig. 1, CSN Fig. 1 are spiral springs, and B Fig. 1 are thin round
packings, GFH Fig. 1 and GFHE Fig. 2 are scribers, and A Fig. 1 is the
conductor, and W Fig. 1 is a cap, RP Fig. 2 are screw pins to fasten the cap W
Fig. 1 and to regulate the projection of the points GFAH Fig. 1 and GFHE
Fig. 2. The action is as follows: Take the tool Fig. 1, in one hand and hold it in a
perpendicular position, place the point A Fig. 1 in the centre punch mark where
a circle wants describing, press it down quick and the conductor A Fig. 1 will guide
the points G F H Fig. 1 and GFHE Fig. 2 true to their destination, then give a
slight twist of the wrist, and the points GFH Fig. 1 and G F H E Fig. 2 will describe
a true circle.
The spiral springs S N Fig. 1 will cause the points G F H Fig. 1 and G F H E Fig. 2
to pass more easily over the surface to be marked. The projection of the conductor A
Fig. 1 farther than the points G FH Fig. 1 and GFHE Fig. 2 will make it more
easy to place in the centre punch mark where a circle wants describing.
packings B Fig. 1 are to regulate the injection of the conductor A Fig. 1, to be took
out as the scribers G F H Fig. 1 and G F H E Fig. 2 ware.
The

page_text: Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is :-
CLAIMS.
" a combination
First. In " Improvements in circle describers for marking work
of parts, consisting of a spiked and shouldered conductor and four spiked and
shouldered scribers sliding in a cross handled receptacle, a cap to regulate the
projection of the said conductor and the said four scribers, packings to regulate the
injection of the said conductor, and spiral springs to force the said conductor and
the said scribers up to the said cap, substantially, as herein described and shown.
Second. In "Improvements in circle describers for marking work" a combination
of parts, whereby the extra projection of the aforesaid conductor will make it easy
to place in the centre punch mark where a circle wants describing, and the said
conductor will guide the aforesaid scribers true to their destination, and describe a
circle with a slight twist of the wrist, the aforesaid spiral springs on the top of the
said scribers will cause the points to pass more easily over the surface to be marked,
substantially as herein described and shown, with reference to the appended sheet
of drawings.
.ni
1
1907
WILLIAM CUTTELL,
Applicant.