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Патент USA US2410864

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NW. 12, 1946.
- Y
Filed May 15, 1944‘
ifa‘rold Brown‘, 7
a», f?fadu;
Patented Nov. 12, 1946
I s HafQldBrown, Denver, 0010.
Application May is, 1944, Serial No. 535,715‘ . —'
2 Claims. (01. 33-410)
screws 20 also extend 2
through the sudesvwm
My invention relates to a drafting instrument
and my object is to provide an e?icient low cost
secure the latter to the inner member-l2.’ The
inner member I2 and the’ strip l8 have reduced
instrument of this character which may be em
ployed to advantage by architectural andrme
chanical draftsmen, designers, artists, teachers,
overlapping portions which ~cooperater'with the
screws 20 and thumb-nuts‘ 22 in holding the mem
ber I2 and the strip I8 in assembly; ‘1- Thelfront
side of the rectangular member 2 is beveledas in
students and others having use for an instrument
of this character.
dicated at 26 toprovide a ruler edge 30] forlgui-d
The primary object of the invention is the pro
ing the point of a‘pencil or ruling pen'i'u'sed‘in
vision of a drafting instrument whereby ,the aid
of which cross-hatching and surface shading can 10 drawing the cross-hatching or other parallel
be uniformly and expeditiously accomplished by
Operation-In using the instrument the de
a novice as accurately as by the most experienced
sired spacing between cross-hatching or other
parallel lines to be drawn may be obtained by
A further object is the provision of an instru
moving the inner member [2 backward against
ment of this character which may be used as a
the front edge 34 of the rear side 6 of the outer
parallel ruler, compass, protractor, letter spacer
member 2. The thumb-nuts 22 are then loosened
and in drafting hexagonal and other geometrical
and the adjustable strip I8 is moved backward
?gures, '
from the rear edge 36 of the front side 4 a dis
Another object is the provision of a simple and
inexpensive drafting instrument of this character 20 tance equal to the desired spacing of the lines.
The thumb-nuts 22 are then tightened to ?rmly
which can be manufactured from cardboard, plas
secure the adjustable strip l8 from independent
tics and other suitable materials at low cost.
movement upon the inner member l2. The outer
Other objects will hereinafter appear and in
member 2 is now moved backward until the edge
order that the invention may be fully understood
reference will now be had to the accompanying 25 36 contacts the frontedge 32 of strip [8. The
initial line is then drawn by moving a pencil or
drawing, in which:
pen along the front edge 30 of the outer mem
Fig. 1 is a front elevation of one form of the
ber 2. Spacing for the second line is then ob
by moving the inner member l2 backward
Fig. 2 is a cross section on line 2—2 of Fig. 1.
Figs. 3 and 4 illustrate modi?cations of the 30 against the edge 34 of the outer member 2 and
then moving the latter backward until its edge
Referring more particularly to the form dis
closed by Figs. 1 and 2,2 designates an outer
rectangular member comprising front and rear
sides 4 and 6, respectively, and end members 8,
which latter unite the former. The outer rec
tangular member 2 has a rectangular opening H1
36 contacts the front edge 32 of the strip l8.
Equal spacing for additional lines is obtained by
repeating the foregoing operations. If preferred
the adjustable strip l8, or its equivalent, may be
applied to the outer member 2 and arranged to
project into the path of the member l2 to check
independent movement of the inner and outer
members when being operated as above described.
In the form disclosed by Fig. 3, parts similar
bly with the outer member 2 by slides M which
those disclosed by Figs. 1 and 2, have been cor
are secured to the inner member and project
respondingly numbered with the addition of ex
into grooves [6 in the respective end members 8.
ponents a. The slides l4, grooves l6, adjustable
The inner member I2 is provided at its for
strip 18, screws 20 and thumb-nuts 22 have been
ward portion with a strip 18 adapted to be ad
justed forward or backward relatively to the rear 45 dispensed with and onespacing of lines to be
drawn is obtained by making the inner member
edge of the front side 6 to vary the spacing be
l2a narrower than the opening Illa in the outer
tween cross-hatching or other parallel lines of
member 2a to leave a space 3 which determines
a drawing. The strip I8 is secured in any of
the spacingybetween lines when the outer and
its adjusted positions upon the member l2 by any
suitable means, such, for example, as screws 20 50 inner members 2a and I2a, respectively, are op
erated in the same manner as the members 2 and
and thumb-nuts 22, which latter are threaded
I2. In order to obtain greater spacing between
upon the former. The screws 20 are ?xed to the
lines the movable element Hat is made shorter
member 12 and extend through slots 24 in the
than the opening |0a to leave a space 5 which
adjustable strip 18 to permit forward or, back
ward adjustment thereof, as above stated. The 55 is wider than the space 3. For convenience of
in which an inner member I2 is movably ar
ranged. The inner member I2 is held in assem
' '
the draftsman this device may be equipped with
various accessories which are optional with the
manufacturer. In the present instance I have
shown accessories comprising a scale 38, a pro
tractor 40, geometrical ?gures 42, 44 and 46, and
perforations 48 for insertion of a pencil point
whereby dots may be made from which guide lines
may be drawn for letters and numbers to be
drawn on an underlying sheet of paper.
or other parallel lines and comprising two ele
ments having reduced overlapping portions slid
able on each other whereby the width of the in
ner member may be adjusted relatively to the
opening in the outer member and thereby vary
the spacing of the lines, manual means for se
curing the two elements in adjusted position, and
slides on one member projecting into grooves in
the companion member to operably hold the
The form disclosed by Fig. 4 comprises outer 10 members in assembly,
and inner members 21) and 12b, respectively, pro
2. A drafting instrument comprising an outer
vided with edges extending at angles of various
member having a marginal ruling edge and an
degrees. Additional angles are provided by the
opening, an inner member slidable in said open
edges surrounding triangular openings 50 and 52
ing to determine the spacing for cross-hatching
formed in the outer and inner members 2b and
I 2b, respectively.
From the foregoing description it is apparent
that I have provided a drafting instrument pos
sessing the advantages above pointed out, and
while I have shown and described three different
forms of the device I reserve all rights to such
other forms and modi?cations thereof as fall
within the scope of the invention as claimed.
Having thus described‘ my invention, what I
claim and desire to secure by Letters Patent is:
1. A drafting instrument comprising an outer
member having a marginal ruling edge and an
opening, an inner member slidable in said open
ing to determine the spacing for cross-hatching
or other parallel lines and comprising two ele
ments having reduced overlapping portions slid
able on each other whereby the width of the in
ner member may be adjusted relatively to the
opening in the outer member and thereby vary
the spacing of the lines, threaded means ?xed in
one element and projecting through parallel
slots in the companion member, manual means
threaded upon said threaded meansvto cooperate
therewith in holding said elements in adjusted
25 position, and means projecting from one member
and slidable in grooves of the companion mem
ber to hold said members in assembly.
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