New or Improved Apparatus or Device for Drawing Curves.
Year: 1899

page_text: Date of Application, 18th Aug., 1899-Accepted, 7th Oct., 1899
COMPLETE SPECIFICATION.
New or Improved Apparatus or Device for Drawing Curves.
I, WALTHER HAEDICKE, of 2, Göthestrasse, Ilmenau, in Thuringen, in the
Empire of Germany, Student of Electricity, 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:-
99
This invention consists of an apparatus or device for drawing lines of any
desired curvature either with a pencil or with a drawing-pen and offers the
curves or curved rulers hitherto in use for
advantage in comparison with the "
the same purpose, that it is not necessary to construct the curve in separate parts
on the drawing, which as is well known gives but very imperfect results, but it
renders it possible to form the curve by one continuous stroke of the pen or pencil.
In the accompanying drawing Figure 1 is a plan of my apparatus or device laid
ready for use on the drawing surface; Figure 2 a side view; and Figure 3 a view
of part of the apparatus taken in the direction of the arrow a in Figure 1.
The apparatus or device consists of a frame, somewhat resembling a pair of
drawing compasses, with legs b and 61, one of which 6 is provided with a quadrant
piece c, and with an opening corresponding to the cross section of the latter, as
well as with a set screw d.
Attached to the ends of the two legs and b¹ and jointed or hinged thereto by
means of the pins e and e¹, are the shoes or clips f and fl which can be clamped in
any desired position by means of the milled-nuts g and g¹. Slots h and h¹ are
the outer ends of the said
provided in
shoes or clips and fl
through which slots a pliable rod or ruler i may be inserted. This rod or ruler i
may be held in any desired position by means of the set-screws
rest with their ends against small spring protecting plates and 1.
The method of using the apparatus is as follows:-
and ¹, which
The frame, resembling a pair of drawing compasses, is laid on the drawing
surface, the legs b and b₁ are fixed at a suitable angle, the shoes or clips f f¹ are
turned round their hinge pins e and e¹ and clamped in the desired position by
means of the nuts g and gl, and the desired bend of the pliable rod or ruler i is
thereby obtained, the necessary movement of the said rod or ruler being simul-
taneously effected in the slots h and h¹. The requisite curvature of the rod or
fuler i having been thus obtained, it is only then necessary to fix the same by
screwing-up the set-screws provided for that purpose.
As is indicated by the dotted lines in Figure 1, it is not only possible to produce
simple curves of any required sharpness by means of the rod or ruler i but even
curves running in different directions as also indicated by dotted lines in the
same figure, and of course the said rod or ruler can also if desired be made of
greater sectional area than it is shown in the drawing, by which greater stiffness
will be imparted to the same, in case it is requisite.

page_text: Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what
I claim is
An apparatus or device for drawing curves, which consists of a frame somewhat
resembling a pair of drawing compasses, the legs 6 6' of which are provided with
hinged shoes or clips f f in which a pliable rod or ruler i can be moved and
clamped as desired, so as to give a great variety of curved forms, the said shoes
or clips being turned and clamped to any desired angle on the ends of the legs of
the said frame, substantially as described with reference to the drawings.
Doted this 10th dow of· wt 1000
W. HAEDICKE.
Per W. H. Beck,
Agent, 115, Cannon Street, London, E.C.