An Improvement or Improvements in the Joints of Drawing Compasses.
Year: 1891

page_text: Date of Application, 29th Jan.; 1891
Complete Specification Left, 13th Oct., 1891-Accepted, 14th Nov., 1891
PROVISIONAL SPECIFICATION.
An Improvement or Improvements in the Joints of Drawing
Compasses.
I SAMUEL THOMAS HICKLING PARKES of Nos. 5 and 6 Saint Mary's Row
Birmingham in the County of Warwick Mathematical Instrument Manufacturer
do hereby declare the nature of this invention to be as follows:-
My invention consists in making the joints of drawing compasses in the manner
hereinafter described whereby a joint simple in construction and efficient in use is
produced.
The drawing compasses to which my invention applies comprise pencil compasses
dividing compasses pen and pencil point compasses universal compasses bow pens
and bow pencils and other like jointed drawing compasses.
My invention consists in making the principal parts of the joint of the drawing
compass from or in one piece with the wires of which the legs of the said compass
are made.
In making a joint according to my invention I take a piece or length of wire
made of iron steel brass or other ductile metal or alloy from which the leg of the
compass is to be made and by a bending operation I bend or coil the end of the
wire into a nearly circular eye or hollow head. The eye or hollow head thus bent
from the end of or made in one piece with the wire leg joins the said leg by a slight
crank or outward bending that is the eye is situated slightly out of the plane of the
wire leg from which it is made by means of which cranking or bending the legs
themselves may be so disposed that they move in the same plane. The eyes or
hollow heads of the drawing compass thus made are jointed together to form the joint
by placing the said eyes face to face and connecting them by a solid copper rivet or
by a bollow rivet or eyelet.
The inner faces of the eyes or hollow heads of the joint may either abut against
one another or a distance piece or washer may be interposed between them; and
before jointing the two eyes or heads together it is preferred so to arrange
the meeting ends of the bent eyes that they are situated on opposite sides of
the joint.
Duted the 20th day of January 1801
W. T. WHITEMAN,
Agent for the Applicant.
COMPLETE SPECIFICATION.
An Improvement or Improvements in the Joints of Drawing
Compasses.
I SAMUEL THOMAS HICKLING PARKES of Nos. 5 and 6 Saint Mary's Row,
Birmingham in the County of Warwick, Mathematical Instrument Manufacturer,
do hereby declare the nature of my 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 consists in making the joints of drawing compasses in the manner
hereinafter described and illustrated in the accompanying drawing, whereby a joint
simple in construction and efficient in use is produced.
The drawing compasses to which my invention applies, comprise pencil compasses,
dividing compasses, pen and pencil point compasses, universal compasses, bow pens
and bow pencils and other like jointed drawing compasses.

page_text: My invention consists in making the principal parts of the joint of the drawing
compass from or in one piece with the wires of which the legs of the said compass
are made by bending or coiling the ends of the wire legs into eyes or hollow heads
as hereinafter, particularly described instead of flattening and piercing the ends of
the legs as usually practised...
In making a joint according to my invention I take a piece or length of wire of
iron, steel, brass or other ductile metal or alloy from which the leg of the compass
is to be made and by a bending operation I bend or coil the end of the wire into a
nearly circular eye. or hollow head. The eye or hollow head thus bent from the
end of or made in one piece with the wire leg, joins the said leg.by a slight crank or
outward bending; that is, the: eye is situated slightly out of the plane of the wire-leg
from which it is made by means of which cranking, or bending the, legs themselves
may be so disposed that they move in the same plane.
The eyes or hollow heads of the drawing compass thus made are jointed together,
to form the joint, by placing the said eyes face, to face and connecting, them,,pre-
ferably by a solid rivet in combination, with a tubular lining and washers as hereinafter,
described.
The inner faces of the eyes.,or,bollow; heads, of the joint, may either abut
against one another, or a distance, piece or washer may be, interposed between
them and before jointing the two eyes or heads together, it is preferred so to arrange.
the meeting ends of the bent, eyes that they are situated on opposite sides, of the
joint.
Figures 1 and 2 of the accompanying, drawing represent elevations taken, at.
right angles. to one another, of a pencil compass. the joint,,of, which,. is.. made.
according to my invention, a portion of the joint of Figure, 2.. being, represented
in section;
Figure 3 represents in section the joint of the pencil compass drawn to a larger
scale than Figures, 1 and 2;
Figures, 4 and 5 represent the legs, of the compass .before, .they, are jointed
together and
Figure 6 represents the tubular lining, the rivet and one of, the washers of the
joint drawn, to the same scale, as Figures 1 and 2.
The same letters of reference, indicate the, same. parts in the several figures of
the drawing.
t
13
a and bare, the legs of the compass made from flat,steel or other wire with rounded
edges, the wire leg a being pointed at bottom and the other leg b being flattened or
expanded at bottom into the curved plate, c to which, the spring,clip or pencil
holder d is soldered; are the nearly circular eyes or hollów heads of the wire
legs a,, the said, eyes or hollow heads being made from the upper ends of the wires
of the said legs by coiling or bending the said ends into the figure represented.
Each eye or hollow head a where it joins the leg is slightly cranked or
bent outwards at e so that the eye is situated slightly out of the plane
of the wire.leg. By means of this cranking or bending, the two eyes when jointed
together bring the wire legs opposite one another and into the same plane.
In jointing the two, legs a, b together, their eyes or hollow_heads, a², bare
placed face to face and the tubular lining (see Figures 2 and. 3) introduced into.
the said eyes. The solid, rivet g is next passed through the tubular lining fand
washers,h, passed, onto its protruding ends. The ends, of the solid rivet g are now
rivetted or expanded upon the faces of the washers h, and the jointing-of the logs.
completed as best seen in the enlarged sectional view, Figure 3.
A washer may be interposed between the faces of the two eyes of the joint, but.
in practice I have found the said washer unnecessary...
..
The application of my, invention to the joints of drawing, compasses other
than, pencil compasses differs in no essential respect from its application to the
joint of a pencil compass as herein before described and illustrated, in, the
accompanying drawing.

page_text: Having now particularly described and ascertained the nature of my inven-
tion and the manner in which the same is to be performed I declare that I
claim as my invention :-
The improvement or improvements in the joints of drawing compasses herein-
before described and illustrated in the accompanying drawing: that is to say,
making the joints of the said compasses by bending or coiling the ends of the pieces
of wire of which the legs of the compass are made into nearly circular eyes or
hollow heads; cranking or bending the eyes or heads slightly out of the plane of
the wire legs, placing the said eyes or hollow heads face to face and rivetting them
together substantially as described and illustrated.
Dated the 12th day of October 1891.
SAMUEL THOMAS HICKLING PARKES.