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Патент USA US2090694

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Aug. 24, 1937.
H. MEYER
2,090,694
ADJUSTABLE DRAFTING TRIANGLE
Filed DeC. l2, 1956
2 Shee_ts-Sheet 1
Aug. 24, 1937.
l
H. MEYER
2,090,694
ADJUSTABLE DRAFTING >TRIANGLE
Filed Deo. l2, 1936
2 Sheets-$11661’I 2
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2,090,69
Patented Aug. Z4, i937
OFFICE.
2,090,694
ADSUSTABLE DRAFTING TRIANGLE
Hans Meyer, Berlin, Germany
Application December l2, 1936, Serial No. 115,458
ln Germany December 17, 1935
13 Claims.
This invention relates to an adjustable draft
ing triangle and has for an object to provide an
isosceles drafting triangle the legs of which may
be adjusted so as to include any desired angle
5 between 0 and 180 degrees.
Another object of the invention is to provide
a drafting triangle of the mentioned type which
is substantially self-arresting in all positions.
A further object of the invention is to provide
l() an adjustable triangle the legs of which may be
moved easily and without the help of springs
or the like from a Zero position, i. e. the position
in which one leg forms the straight line continu
ation of the other one into any desired position
15 up to the position in which the legs cover each
other.
rl‘he invention essentially consists of an elon
gated frame or casing forming the base of the
drafting triangle and two leg members pivotally
connected at one oi their ends, the other ends
being symmetrically movable within said casing
by means of a drive or gearing.
25
The invention furthermore contemplates the
provision of lugs at those leg ends which are mov
able within said casing, and two guiding mem
bers being symmetrically movable lengthwise
within said casing.
Said legs are pivoted at the
guiding members respectively, and the pivots at
the guiding members and the pivots at the oppo
site ends of the legs are so arranged as to lie
always at the corners oi a geometric triangle.
Further objects and details of the invention
will be apparent from the description hereinafter,
and the annexed drawings showing an embodi
ment of my invention by way of example. In the
drawings are:
(Cl. 33-91)
placed on a T-square when the adjustable tri
angle is being used. The casing consists of a
frame member 2 having U-shaped cross-section,
a front plate 3 and a back plate 4 both secured
to frame 2. I prefer to make part 2 of metal and
5
plates 3 and 4 of wood or other suitable non
metallic material. Casing l together with two
movable legs 5 and 5a forms the adjustable trí
angle. The legs 5 and 5a which may be made
of any suitable material preferably have Z-shaped
cross-sections (see Fig. 5), the top flanges d5
and 45a being considerably wider than the bot
tom flanges 4S and ilëa which rest on the drawing
surface when the device is in use. One of the
legs, for instance, leg E, is higher than the other
one that is to say its web 4l is higher than web
Ma, so as to permit overlapping of the legs as
clearly shown in Figs. 4 and 5. The top ends of
the legs are pivotally connected by a'pin t. The
lower ends of the legs are passed through a lon- 20
gitudinal slot 48 in the top wall of the casing
frame 2. The center portion of slot 48 is wider
than its side portions 49 and 49a, and the side
portions are staggered, so as to permit the flanges
¿l5 and 45a of the legs 5 and 5a respectively to
move in diiîerent planes. Furthermore, the lower
ends of webs 41 and lila are provided with re
cesses 5B and 59a and back plate f1 is provided
with recesses 5I and Ela, in order to make allow
ance for the movements of the lower ends of
flanges 4t and 46a. The lower ends or" flanges
45 and 45a have inwardly projecting lugs ‘I and
la respectively, pivot pins 9 and Sa passing there
through. The front portion of the casing is pro
vided at its inside with two parallel recesses or
grooves Ei and lla at different heights of the
casing, the grooves extending from near the op
Fig. 1 a front elevation of a device according posite ends of the casing beyond its middle por
to my invention in the zero position in which the tion. Two guiding members or rods lil and ma
legs are parallel with the base of the drafting are slidably arranged within said recesses or
.
4()
40 triangle;
grooves ll and lla. respect1vely. Guiding mem
Fig. 2 a top View;
“ ber lll has a downwardly extending projection l Hl,
Fig. 3 a sectional view along line 2-2 of Fig. and guiding member loa has an upwardly ex
6; solid lines indicating the same position of the tending projection llíla, said projections carry
legs as in Fig. l, and dash lines indicating a posi
ing the afore-mentioned pivot pins 9 and Sa so
5 tion in which the legs include angles of 45 de
that the latter maybe moved along one and the
grees with the base;
same straight line when members lll and ma
Fig. 4 a partial view similar to Fig. 3, the legs slide in their respective grooves il and lla.. Near
being in the position where they include angles the ends of the casing, two rollers I2 and 12a are
of 90 degrees with the base of the triangle;
rotatably mounted, and a turning knob i6, ar 50
Fig. 5 a section along line 5-5 of Fig. 4;
50 Figs. 6 to 8 sections along lines 6_6, l-l and ranged at the front side of the casing, is rigidly
connected with one of the rollers, for instance
8_8 respectively of Fig. 3, and
l2. Flexible members I3 are attached to the
Fig. 9 a rear view.
I
ends
of the guiding members, and are passed
Referring now to the figures, l is a casing
55
55 forming the triangle base and which may be about the rollers so that upon turning of knob
2
2,090,694
I5 one of the guiding members will slide in its
pertaining groove from the one side to the other
side while the other guiding member moves in
the opposite direction. Each roller is pivoted
Ul on a sled ifi beingshiftable within casing I by
means of screws I5 and IEa passing through the
end walls of the casing. In order to permit such
many alterations and modifications are possible
within the scope of the invention. For instance
any other suitable drive for the movement of
the triangle legs may be used instead of the drive
employing flexible means.
I claim:
shifting of roller I5, the casing and front plate
a base member, two leg members, a pivot con
necting said two leg members at one of their
3 have an elongated slot 30 in which the shaft
3l carrying both roller I5 and knob I6 may move.
By turning screws I5 and I 5a, or only one of
them in such a direction that the pertaining sleds
or sled are or is moved towards the end of the
casing the iiexible members I3 may be stretched,
15 and by turning the screws so as to shift both
sleds in the same direction the center position
of legs 5 and 5a may be adjusted.
Means are provided for setting the legs at a
deñnite angle with respect to each other. For
20 this purpose, the top of leg 5 carries a scale I'I
on which corner I‘Ia of leg 5a indicates the ad
justed angle. Instead of scale I'I or in addition
thereto, in the latter case as an alternative means,
the front side of casing I inclusive front plate 3
25 may be provided with a longitudinal slot I8 op
posite which an indicator I9 may travel and in
dicate, at scales 2l and 22 alongside slot I8, the
angle enclosed by the legs or the grade of the
inclination of the legs with respect to the base.
30 For this purpose indicator I9 may be fastened
to any suitable portion of the movable parts I0,
Ilia and I3.
As clearly shown in Fig. 3, pivots 9 and 9a are
» located considerably below pivot 8, and consti
35 tute therewith a geometric triangle even if the
legs are in zero position (Fig. 3). This geometric
triangle is suñiciently high to cause the legs to
rise from zero position easily and without the
help of springs or equivalent means when their
I
40 lower ends are being moved towards each other.
Complete erection of the legs to 90 degrees with
respect to the base (Fig. fl) is made possible by
the difference in the height of the webs of the
Z-shaped legs which permits them to overlap
45 each other, and by the arrangement of lugs III!
and itil-a in diiferent planes'whereby pivots 9
and 9a, may pass each other beyond the center
line of the apparatus.
When legs 5i and 5a are brought into the posi
50 tion in which the axes of pivots 9 and 9a are in
line the legs 5 and 5a might be swung together
towards the left or the right hand side. In
order to prevent such movement, recesses 5I and
Ela of back plate 4 are so shaped that their
55 edges form guiding faces to support the lower
corners 52 and 52a of the leg flanges d5 and 46a
when pivots 9 and 9a are close to each other.
The adjustable triangle according to my inven
tion offers many advantages among which are
60 the following:
Very small angles of only a few degrees over
zero and below 90 degrees may be set.
The legs may be readily erected from their
completely stretched position.
65
The legs cannot spring even if in an almost
horizontal position.
The apparatus does not require additional ar
resting means, because any alteration of an ad
justed position requires opposing movements of
70 the lower ends of the legs which prevents unde
sired shifting due to one-sided pressure during
the drafting.
Although I have described a particular em
bodiment of my invention I do not wish to re
75 strict myself to the illustrated structure since
1. An adjustable drafting triangle comprising
ends, and two other shiftable pivots for the other 10
ends of said leg members respectively in connec
tion with said base member, said leg members
having a zero position in which they are collin
early extended and parallel with said base mem
ber, and being adjustable between said zero posi
tion and an erected position, said three pivots
being located at the corners of a geometric tri
angle with said ñrst mentioned pivot above said
other pivots when said leg members are in zero
position.
2. An adjustable drafting triangle comprising
20
a base member, two leg members having equal
length, a pivot connecting said two leg members
at one of their ends, two other shiftable pivots ‘
for the other ends of said leg members respective 25
ly, and means on said base member for moving
said shiftable pivots symmetrically with respect
to said ñrst mentioned pivot, said leg members
having a Zero position in which they are col
linearly extended and parallel with said base 30
member and a fully erected position in which
they overlap each other, and being adjustable be
tween said zero position and said fully erected
position, both said leg members and said base
member having rear surfaces in an identical 35
plane, and said three pivots being located at the
corners of a geometric triangle with said first
mentioned pivot above said other pivots when
said leg members are in zero position.
3. An adjustable drafting triangle comprising 40.
a base member, two leg members having equal
length, a pivot connecting said two leg members
at one. of their ends, two other shiftable pivots
for the other ends of said leg members respec
tively, means on said base member for moving
said shiftable pivots symmetrically with respect
to said ñrst mentioned pivot, said leg members
having a fully erected position at right angles to
said base member, in which they overlap each
other, and a zero position in which they are 50
collinearly extended and parallel with said base
member, and being adjustable between said Zero
position and said fully erected position, said two
shiftable pivots being movable along parallel
lines so as to be capable of passing each other,
and said three pivots being located at the corners
of a geometric triangle with said first mentioned
pivot above the other pivots when said leg mem
bers are in zero position.
y
4. An adjustable draftingr triangle comprising 60
a base member, two leg members of equal length
and Z-shaped cross-section, one flange of which
being narrower than the other one and being
adapted to rest upon a drafting surface, and the
web of one of said legs being shorter than that of
65
the other one, so as to permit said legs to overlap
each other, a pivot connecting said two leg mem
bers at one of their ends, two other shiftable
pivots for the other ends of said leg members re
spectively, said two shiftable pivots being movable 70
along parallel lines so as to be capable of passing
each other, and means on said base member for
moving said last mentioned pivots symmetrically
with respect to said first mentioned pivot.
5. An adjustable drafting triangle comprising
75.
y 3
connecting the ends of said rigid parts and form
a' base member, two` leg‘members of equal length,
ing therewith an endless member, two rollers of
a 'pivot connecting said two leg members at one
of their ends, two other shiftable pivots for
the other ends ci said leg members respectively
in connection with said base member, said shift
able pivots being arranged in different planes so
equal diameter for guiding and driving said flexi
ble parts, said base member having two parallel
grooves extending from points near the opposite «» Cl
ends of the base member beyond the middle
thereof, said rigid parts being guided within said
as to be able to pass` each other, means for mov
grooves of said base member, means projecting
ing said shiftable pivots symmetrically with re
spect to said first mentioned pivot, said base mem
in diiferent planes from said rigid parts into the
space therebetween for articulately attaching
the base ends of said leg members, and means at
ber having a length of not less than twice the
10
length of one of said leg members and enclosing
said shiftable pivots and'said moving means, and
means at the outside of said base for controlling
said moving means, said leg members having a
15 Zero position in which they are collinearly ex
the outside of said base member for turning one
' of said rollers.
9. An adjustable isosceles drafting triangle
' comprising a base member having a top wall and
tended and parallel with said base member, andv
being adjustable. between said zero position and
an erected position, said three pivots being lo
cated at the corners of a geometric triangle when
20 said leg members are in zero position.
6. An adjustable drafting triangle comprising
a base member, two leg members of equal length,
a pivot connecting said two leg members at one
of their ends, two other shiftable pivots for the
25 other ends of said leg members respectively in
connection with said base member, an endless
drive including a pulling portion and a pulled
portion, one of said last mentioned pivots being
attached to said pulling portion and the other
30 one to said pulled portion, said last mentioned
pivots being arranged in different planes other
than the plane defined by said pulling and said
pulled portion of the endless drive, said drive
being arranged within said base member, and
35 means at the outside of said base member for
operating said drive, said leg members having a
Zero position in which they are collinearly ex
tended and parallel with said base member, and a
fully erected position in which they overlap each
other, and being adjustable between said zero
40
position and said erected position, said three
pivots being located at the corners of a geo
metric triangle with the first mentioned pivots
above the other pivots when said leg members
45
are in zero position.
’7. In an adjustable isosceles drafting triangle,
a drive for shifting the base ends of the legs
symmetrically with respect to the altitude of the
triangle, comprising an endless member having
a rear wall, two leg members of Z-shaped cross
section, said leg members being articulately con
nected at their top ends and being adapted to
overlap each other when their base ends are
brought together, the top wall of the base mem 20
ber being slotted and recessed and the rear wall
being recessed to permit the base ends of the
leg members to enter into the base member, the
base ends of the front flanges of the Z-shaped
leg members each having a sideways projecting 25
lug, a drive within said base member, said drive
including parts movable symmetrically with re
spect to the altitude of the triangle and being
articulately connected with said lugs, and means
for operating said drive from the outside of said 30
base member.
10. An adjustable drafting triangle compris
ing a base member, two leg members of equal
length and Z-shaped cross-section, one flange of
which being narrower than the other one and 35
being adapted tov rest upon a drafting surface,
and the web of one of said legs being shorter
than that of the other one so as to permit said
legs to overlap each other, a pivot connecting
said two leg members at one of their ends, two 40
other shiftable pivots for the other ends of said
leg members respectively, said two shiftable piv
ots being movable along parallel lines so as to
be capable of passing each other, guiding means
for said leg members at said base member for 45
preventing said leg members from swinging in
the same direction when the axes of said shift
able pivots are in line, and means within said
base member for moving said last mentioned
flexible portions and including a pulling portion
and a pulled portion, two rollers of equal diameter
for guiding and driving said endless member, the
pivots symmetrically with respect to said first 50
center of said rollers being arranged on a line
a base member consisting of a metallic part of
U-shaped cross-section, and a non-metallic rear
parallel to the base line of the drafting triangle,
means connected to said pulling portion sideways
En 'Qi thereof and projecting towards said pulled por
tion and means connected to said pulled portion
sideways thereof and projecting towards said pull
ing portion'for articulately attaching the base
ends of the triangle legs respectively said pro
60 jecting means being arranged in different planes,
and means for adjusting the position of the axes
of said rollers in the direction of the line con
necting the centers of said rollers, so as to stretch
said endless member by increasing the distance
o of said rollers from each other, and to shift the
center line of the triangle sideways by shifting
both rollers in the same direction.
8. In an adjustable isosceles drafting triangle,
a base member, two leg members articulately
connected at their top ends, and a drive within
said base member for moving the base ends of
said leg members symmetrically with respect to
the altitude of the triangle, said drive compris
,75
ing two rigid elongated parts, two flexible parts
mentioned pivot.
11. An adjustable drafting triangle comprising
plate covering the flanges of the U-shaped cross
section, two leg members having equal length
and including each a lateral projection at its
base end, said projections protruding through
recesses into said base member, a pivot connect
ing said two leg members at their top ends, two 60
other shiftable pivots in different planes for the
projections of said leg members respectively with
in said base member, means >for moving said
shiftable pivots symmetrically with respect to said
first mentioned pivot, said three pivots being lo 65
cated at the corners of a geometric triangle when
said leg members are in Zero position in which
they are collinearly extended, said moving means
being attached to the metallic part of said base
member Within its U-shaped cross-section.
l2. An adjustable isosceles drafting triangle
comprising a base member having a top wall and
a rear wall, two leg members of Z-shaped cross
section, said leg members being articulately con
nected at their top ends and being adapted to 75
4
2,090,694
overlap each other when their base ends are
brought together, the top wall of the base mem
ber being slotted and recessed to permit the base
ends of the leg members to enter into the base
member, the rear wall of the base member be
ing recessed, the edges of the rear wall recesses
forming abutments for the rear flanges of said
legs When approaching their erected position, the
base ends of the front flanges of the Z-shaped leg
10 members each having a sideways projecting lug,
a drive within said base member, said drive in
cluding parts movable symmetrically with respect
to the altitude of the triangle and being articu
lately connected with said lugs, and means for
15 operating said drive from the outside of said
base member.
13. An adjustable drafting triangle comprising
an elongated member forming the triangle base,
two leg members each having a lateral projection
of its base end, a pivot connecting said two leg
members at their top ends, two shiftable pivots
for connecting said base member with said lateral
projections, said leg members having a zero posi
tion in which they are collinearly extended and
parallel with said base member, and being ad
justable between said zero position and an erected 10
position, and said three pivots being located at
the corners of a geometric triangle with the first
mentioned pivot above the other pivots when said
leg members are in zero position.
15
HANS MEYER.
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