Elevated Drafting Rule Page: 2 of 3
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UNITED STATES PATENT OF-FICE.
ANDREW E. ANDERSON, OF BROWNSVILLE, TEXAS.
ELEVATED DRAFTING-RULE.Specification of Letters Patent.
Patented Jan. 30, 1917.
Application filed March 10, 1916. Serial No. 83,282.
To all wkom it may concern:
Be it known that I, ANDREWE, .-E ANDERI-
SON, a citizen of the IUnited States, residing
at Brownsville, in the county of Cameron
and State of Texas, have invented certain
5 new and useful Improvements in Elevated
Drafting-Rules, of which the following is a
specification.
This invention relates to new and useful
improvements in an instrument for the
10 drafting or ruling of straight lines, which is
an -elevated drafting rule with various at-
tachments and provisions, as hereinafter de-
scribed, designed to attain the objects stated
as follows: To provide a drafting rule which
15 being elevated above the surface of the draw-
ing may therefore be placed over freshly
inked and.undried lines or figures and used
for the ruling of new lines; to provide the
means as hereinafter described, of raising
20 and lowering the ruling edge or straight
edge of said rule so that without lifting the
rule from the drawing, said ruling edge or
straight edge may be raised and shifted to a
new position without the danger of its smear-
ing the undried ink underneath; to provide
a drafting rule, which, when being shifted
or slid over the surface of the drawing, will
be in contact with said surface at only four
30 places, each of almost negligible area, thus
preventing the drawing paper or cloth from
being rubbed and soiled as when an ordinary
triangle or rule is used; to provide in con-
nection with the straight edge of said rule,
35 means of pressing and holding the drawing
paper or cloth firmly against the surface of
the drafting table or board, immediately at
each end of the line to be ruled and thus pro-
curing a firm surface upon which to draw;
40 and by the same means to provide against
the tendency of the rule to slip when in use,
caused by the pressure of the pen or pen-
cil or other instrument upon the straight
edge of the rule.
4 With the above and other objects in view
the invention has particular relation to cer-
tain novel features of construction, opera-
tion and arrangement of parts, an example
of which is given in this specification and
50 illustrated in the accompanying drawing,
wherein:-
Figure 1 is a perspective view of the rule,
Fig. 2 is a top plan view, Fig. 3 is a bottom
plan view, Fig. 4 is a transverse sectional
55 view taken on the line a-a of Figs. 2 and
3, Fig. 5 is a transverse sectional view takenon the line b-b of Figs. 2 and 3, and Fig.
6 is a longitudinal sectional view taken on
the line c-c of Figs. 2 and 3.
Referring now more particularly to the 60
drawings wherein like numerals of reference
designate similar parts in each of the figures
the numeral 1 refers to the rule proper and
is a rectangular body preferably formed of
glass or some other suitable rigid transpar- 65
ent material and which has the straight edge
2. Metallic plates 3 and 4 are crimped over
the respective ends of this rule and up-
standing from the former of which is the
knob 5 by means of which the rule may be 70
lifted and moved. An oblong groove 6 ex-
tends from end to end of the rule along its
upper side and near the edge opposite the
straight edge 2 and parallel with said
straight edge 2, and slidable in this groove 75
is the guide 7, upstanding from which is the
pin 8 by means of which said guide may be
moved back and forth in said groove; and a
flexible strap 9 is integral, at one end, with
said guide and is bent around underneath 80
the rule and rests closely against the under
side thereof, its free end extending as closely
as may be to the straight edge 2 of the rule,
the bent portion of said flexible strap 9
forming a spring of sufficient strength to 85
hold said guide 7 snugly in the groove 6.
The ends of the plates 3 and 4 adjacent to
the straight edge and the corresponding end
of the strap 9 are deflexed underneath, the
bent back portions being bifurcated forming go
fingers as 10, 10, which diverge as shown in
Fig. 3, and rubber tips 11 are secured be-
tween said fingers. At the opposite ends of
the plates 3 and 4, and depending therefrom,
are the supporting legs 12 and 13, spaced g5
apart and having smooth rounded ends, the
former of which are slightly longer than the
latter so that when said legs 13 are touching
upon a plane surface the rubber tips will be
elevated slightly above the surface. Thus 100
when an ink drawing is being made the rule
can be slid on the legs 12 and 13 and the
straight edge 2 brought to another position
without smearing the undried ink with the
rubber tips. The work can thus proceed 105
without waiting for the ink to dry thereby
saving a great deal of time.
When the rule has been moved until the
straight edge 2 is in position to rule the line
to be drawn a slight pressure on the rubber 11C
tips 11 will operate to press the paper or
other drawing surface flatly against the sur-1,213,813.
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Anderson, Andrew E. Elevated Drafting Rule, patent, January 30, 1917; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth860109/m1/2/?q=%22%22~1: accessed June 30, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.