Involuting Drawing Instrument Page: 2 of 3
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UNITED STATESPATENT OFFICE.
OSCAR E. McCASKILL, OF FORT WORTH, TEXAS.
INVOLUTING DRAWING INSTRUMENT.Specification of Letters Patent.
Patented Aug.11, 1914.
Application filed November 17, 1913. Serial No. 801,358.
To all whom it may concern:
Be it known that I, OSCAR E. MCCAsKILL,
a citizen of the United States, residing at
Fort Worth, in the county of Tarrant and
5 State of Texas, have invented certain new
and useful Improvements in Involuting
Drawing Instruments, of which the follow-
ing is a specification.
This invention relates to a drawing instru-
10 ment and particularly to a drawing instru-
ment for drawing involuting curves, and the
object is to provide a simple and highly efli-
cient mechanism for using a drawing pen or
pencil, or other instrument, and which will
15 be easily operated.
Other objects and advantages will be fully
explained in the following description and
the invention will be more particularly
pointed out in the claims. p
20 Reference is had to the accompanying
drawings which form a part of this applica-
tion.
Figure 1 is a side elevation of the drawing
instrument. Fig. 2 is a side elevation of the
25 spacing and adjustment wheel and guide..
Fig. 3 is an end view of the pen carrier or
chuck. Fig. 3a is a vertical section of the
same. Fig. 3b is a bottom plan view of the
same. Fig. 4 is a horizontal section of the
30 pivot post taken along the line J-J of Fig.
1. Fig. 5 is a detail view of the adjusting
screw shaft. Fig. 6 is a side elevation, show-
ing a variation in the pen carrier. Fig. 7 is
an end elevation of the same.
35 Similar characters of reference are used to
indicate the same parts throughout the sev-
eral views.
The drawing instrument includes a wheel
A which is provided with a rubber rim or
40 with a rim of some substance which will have
some friction. This wheel is for the purpose
of spacing the distance between the curves to
be made and also for adjusting a screw shaft
C. The wheel A may be considered also a
45 tangential guide. The wheel A is made.
rigid with the shaft C by a set screw B. The
screw shaft C is journaled in a pivot post D
and turns freely in this post. The screw
shaft C has an annular groove K therein and
50 a set screw I is screwed into the pivot post D
and projects into the groove K to prevent
longitudinal movement of the shaft C
through the pivot post D. A guide rod E
is fixedly mounted in the pivot post D and
55 held therein by a pin L. The carrier F for
the drawing instrument has apertures M forthe guide E and N for the screw shaft C.
The carrier F will move freely on the guide
rod E.
When the instrument is in operation the 60
wheel A is moved around on the paper or
cloth or other material on which the draw-
ing is being made and as the wheel A moves
it turns the shaft C and as the shaft C turns
the carrier F will be moved in the direction 65
of the threads on the shaft C. It will be
noted that the threads on the shaft C may
be either right or left threads.
A pen H .is provided and enters a socket
F" in the lower part of the carrier F. The 70
pen H is held in place by a spring G which
has one end rigid in the carrier F and the
other end projecting into the upper part of
the pen H. This provision allows a yielding
motion to the pen and will always insure 75
contact of the pen on the paper or cloth or
other material on which the curves are to be
drawn. The pen H is provided with a set
screw 0 for opening or closing the two parts
of the pen for the purpose of drawing nar- 80
rower or wider lines.
A variation of the pen holder or carrier is
shown in Figs. 6 and 7. The pen H is pro-
vided with a shank P and a socket V is
formed on one edge of the carrier F'. The 85
shank P will move freely through the socket
V and is connected to a holder T above the
carrier F'. The shank P is made rigid with
the bar T and a spiral spring R is mounted
on the shank P between the carrier F' and 9o
the pen H. The shank P can thus move
freely through the socket V, but is held
yieldingly downward by a spiral spring R.
The bar T is guided in its vertical movement
by a pin S which is rigid with the carrier F'. 95
The pin S serves as one guide and the socket
V serves as another guide for the vertical
movement of the pen H.
The function of the rod E is to prevent
the turning of the carrier F during a writ- 100
ing or drawing operation and also, as above
described, to guide the pen H and to prevent
wabbling motion of the same in its radial
movement.
It will be observed that by reason of a 105
right thread on the shaft C the pen H may
be set near the pivot post D to commence
a curve, and as the instrument is operated
by turning the wheel A about the pivot
post D the curve will become uniformly 110
larger as the wheel A is turned because the
thread on the shaft C is uniform and each1,106,883.
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McCaskill, Oscar E. Involuting Drawing Instrument, patent, August 11, 1914; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth859173/m1/2/?rotate=270: accessed June 23, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.