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Патент USA US3085354

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April 16, 1963
'
R. c. TUCKER
3,035,344
DRAWING INSTRUMENT
Filed Nov. 27, 17959
3 Sheets-Sheet 1
40
FIG.1
INVENTOR.
Richard C. Tucker
AT TO RNEY
April 16, 19-63
R. c. TUCKER
3,085,344
DRAWING INSTRUMENT
Filed Nov. 27, 1959
5 Sheets-Sheet 2
42
465 45c 46D
'
\1a
FIG.8
..'_
T
_'_
A
'
I
FIG.4
‘
3o /
T.
I
INVENTOR.
Richard C. Tucker
ATTORNEY
April 16, 1953
R. c. TUCKER
3,085,344
DRAWING INSTRUMENT
Filed Nov. 27, 1959
3 Sheets-Sheet 3
FIG. 10
H<—|
150
152
may 52
150
154
1 s
150
INVENTOR.
Richard C. Tucker
ATTORNEY
United States Patent 0 ’
1
3,085,344
DRAWING INSTRUMENT
Richard C. Tucker, Darien, Qonm, assignor, by mesne as
signments, to Pennywise Investment Association, North
Ridge, Claymont, Del, a corporation of Delaware
Filed Nov. 27, 1959, Ser. No. 855,793
3 Claims. (Cl. 33--80)
3,d85,344
Patented Apr. 16, 1963
2
FIG. 12 is a top plan view of the slide member;
FIG. 13 is a side elevation view of the slide member;
FIG. 14 is an enlarged end elevation view of the slide
member; and
\FIG. 15 is a bottom plan view of a portion of the
angle arm.
In FIG. 1, a drawing instrument It)‘ is shown positioned
on a sketch pad 11. The drawing instrument is made
The present invention relates to a drawing instrument
up of ‘a thin elongated transverse member 12, a pair of
and more particularly to a drawing instrument, for use
end members 14- contacting the sides of the sketch pad
with sketch pads of different widths, which combines in a
and attached to the transverse member by pins 16 and
single compact unit the features of a T square and
an angle arm 18 pivotally attached to the transverse mem
angles.
ber by a pin 20.
There are many instances where sketches have to be
In position on the sketch pad, the transverse member
drawn without any equipment available for making them 15 12 lies across the width of the pad 111 so that both of
other than a straight edge and a sketch pad. The sketches
its ends 24- extend beyond the sides of the pad. The
as a result ar usually inaccurate and di?icult to draw.
longitudinal edges of the transverse member provide a
It is the object of this invention to provide a simple,
pair of parallel straight edges 26 disposed at right angles
compact drawing instrument capable of being carried
to the side of the sketch pad.
In the lower ‘face of the transverse member 12 and
ext-ending across its length, there is a longitudinal groove
28, see FIG. 3. The longitudinal groove 28 is rectangu
lar in cross-section and has a depth of roughly half the
about in a brief case or letter size portfolio which can
be used with a sketch pad to make fast, neat, accurate
sketches.
Therefore, the drawing instrument in this invention
comprises a transverse member adapted to lie across a
thickness of the transverse member. It is centered on
sketch pad. End members are attached to the ends of 25 and extends along the longitudinal centerline of the
the transverse member to square the drawing instrument
transverse member.
against the sketch pad with the longitudinal edges of the
In addition to the longitudinal groove, a pair of athwart
transverse member providing a pair of straight edges. vAn
grooves 3b are also formed in the lower face. The
angle arm also having a pair of straight edges is piv
athwart grooves 3t) extend across the width of the trans
otally attached to the transverse member and extends
verse member perpendicular to the longitudinal groove
angularly therefrom so that a number of predetermined
and are similar in cross-sectional shape to the longitudinal
angles can be drawn with the straight edge of the trans
groove having the same width but only about half the
verse member.
depth. The athwart grooves are spaced apart from one
The various features of novelty which characterize the
invention are pointed out with particularity in the claims
annexed to and forming a part of this speci?cation. For
another being located close to the opposite ends 24 of the
transverse member.
A narrow through-slot 32 extends along the longitudinal
centerline of the transverse member forming an opening
between the upper face and the longitudinal groove. The
width of the through-slot 32 is considerably less than that
40
tive matter in which I have illustrated and described a
of the longitudinal groove. As can be seen in FIG. 1,
preferred form of my invention.
when the drawing instrument 10 is placed on the sketch
a better understanding of the invention, its operating ad
vantages and speci?c objects attained by its use, reference
should be had to the accompanying drawings and descrip<
In the drawings:
pad 11, the through-slot 32 extends beyond the sides of
FIG. 1 is a perspective of a drawing instrument, em—
the sketch pad and terminates vat each end at a point
bodying the construction of the present invention, shown 45 between the end of the transverse member and the ad
positioned on a sketch pad;
iacent athwart groove 30.
FIG. 2 is a plan view of the drawing instrument, with
The transverse member ‘is formed of a transparent
a portion of both the transverse member and the angle
plastic material. Scales, which can be read by looking
member removed;
through the transverse member, are marked in the lower
FIG. 3 is a bottom plan view of the transverse mem<
faces along both of the straight edges 26. The position
ber with a portion thereof removed;
of these scales on the lower face avoids any interference
FIG. 4 is a longitudinal sectional view of the trans
verse member .taken along the line 4—4 of FIG. 3 with
which would occur if a raised scale on the upper face
a portion of the transverse ‘member removed and showing
the thickness in exaggerated scale;
FIG. 5 is a top plan view of the end member;
FIG. 6 is a side View taken along the line 6-6 of
FIG. 2 showing the end member in elevation and the
transverse member in section and with their thicknesses
shown in exaggerated scale;
were used.
In FIG. 2, the end members 14 are shown attached to
55 the transverse member 12 so that their upper faces con
tact the lower face of the transverse member. Each end
member has a squaring edge 34 arranged in opposed
parallel relationship to the other and disposed perpen- _
dicularly to the straight edges 26 of the transverse mem
60 ber.
The squaring edges 34 extend beyond the straight
FIG. 7 is a bottom plan view of the angle arm;
edges 26 of the transverse member 12 in a T-shaped
FIG. 8 is a longitudinal sectional view of the angle
arrangement. With any normal variations in the width
arm taken along the line 8—-8 in FIG. 7 and showing
of individual sketch pads, the length or bearing surface
the thickness of the angle arm in exaggerated scale;
of the squaring edges 34- is sufficient to provide accuracy
and
65 in drawing lines with the straight edges 26. As an ex
FIG. 9 is a top plan View of the angle arm;
ample, in a drawing instrument ‘for use with a sketch pad
FIG. 10 is a top plan view of another embodiment of
8.5 inches wide, the transverse member would be 1.375
the invention showing only a portion of the transverse
inches in width and the length of the squaring edges of
member and the angle arm;
the end member would be three (3) inches. The width
FIG. 11 is an enlarged side view taken along the line
of the end member taken normal to the squaring edge is
11-41 in FIG. 10 with a portion of the angle arm broken
less than that of the transverse member, or in the ex
away;
ample just cited it would be one (1) inch.
3,085,344
4
an
A tongue 36 of rectangular cross section protrudes up
ment about the transverse line, the grooves provide a
wardly from and extends across the upper face of each
stepped appearance.
of the end members at right angles to the squaring edge.
The tongue 36 is slightly smaller in width than the lon
gitudinal groove 28 so that it will be engagably ?tted
therein. In the example of the drawing instrument cited
above, the longitudinal groove would be .375 inch wide
while the tongue would be .371 inch wide thereby provid
The deepest angle selector groove 46A has the narrow
est width and is the only groove which has its sides in
ing a tight ?t so that the transverse member will not tend
to shift position on the sketch pad.
IN FIG. 6, the end member 14 is illustrated having its
tongue 36 engaged within the longitudinal groove 28 of
parallel relationship for their entire length. The remain
ing angle selector grooves 46B, 46C, 46D working out
wardly from the deepest grooves are successively shallow~
er and wider. Unlike the deepest groove 46A, these three
grooves are not of uniform width.
They are narrowest
at the intersection of their sides with the longitudinal
centerline of the angle arm 18 and on either side thereof,
they are in diverging relationship. While the opposing
the transverse member 12. A. pin hole 38 is located on
sections of the sides of the grooves are diverging from
the longitudinal centerline of the tongue 36 midway be
each other, the diagonally opposite sections, that is the
sections on opposite sides both of the transverse line and
tween its ends and passes through the end member. The
the longitudinal centerline are in parallel relationship.
lower end 38A of the pin hole has an increased diameter
Though each of the grooves is of a di?erent width when
to provide a recess to receive a spring 3%. The pin 16
measured along a line parallel to the longitudinal center
with the spring 39 coiled about and attached to its lower
line of the angle arm, they are of equal width when
end passes through the pin hole in the end member and
the through-slot 32 in the transverse member to attach 20 measured normal to the sections of their sides which are
arranged in parallel relationship.
these members together. A knob 49 is provided on top
As can be noted in FTG. 2, the angle selector grooves
of the pin and bears against the transverse member. As
46A, 46B, 46C, 46D are adapted to engage with the
shown in PEG. 6, the pin is spring loaded to hold the end
transverse member and position the angle arm in a num
member in position against the transverse member. How
ever, this is only one of several ways in which these two 25 ber of predetermined angles. In FIG. 2, the angle selector
groove 46C in engageably ?tted over the transverse mem
members can be held together, another would be to have
her to form a 45 degree and a 135 degrees angle between
the upper end of the pin threaded and the knob 49
the straight edges of the angle arm and of the transverse
screwed thereon.
member. The angle selector, grooves are so arranged
By sliding the knobs 40, the pins 16 will side along the
through-slot 32 and the end members 14- can be posi 30 that the sections of their sides which are in parallel
relationship will ?t closely over the transverse member.
tioned along the transverse member 12 to adjust to the
For purposes of illustrating the relative widths of the
width of the sketch pad 11. The squaring edges 34 bear
transverse member and the angle selector grooves if the
against the sides of the pad so that the drawing instrument
example of the drawing instrument mentioned earlier is
it} can be moved either up or down the pad while the
‘used, the transverse member is 1.375 inches wide while
straight edges 26 are maintained normal to the sides of
the pad.
The angle arm 18 is a thin elongated member made
the parallel sides of the grooves are spaced 1.377 inches
apart. This narrow clearance permits the angle arm to
slide along the transverse member and at the same time
of transparent plastic smaller both in width and length
to hold it securely in place for drawing purposes.
than the transverse member. The longitudinal edges of
Several of the various predetermined angles which can
the angle arm form a pair of straight edges 42 arranged 40
be formed between the‘ respective straight edges of the
in parallel relation with one another. In its assembled
angle arm and transver-ses member are shown in phantom
working position, on the drawing instrument, the angle
lines in FIG. 2. The deepest angle selector groove 46A
arm extends angularly from the transverse member and
permits the positioning of the angle arm at right angles
has its lower face in contact with the upper face of the
transverse member. It is pivotally attached to the trans;
verse member by the pin 2t?‘ having a knob 43 which is
similar in construction and operation to the pins 16. A
to the transverse member. By rotating the angle arm
about pin 20‘, a 60 degree angle with the horizontal can
along the through-slot 32 thereby permitting the angle
carrying. The end members 14 can be rotated 90‘ degrees
about the connecting pin 16 and the tongue on the upper
faces of each will then ?t into one of the athwart grooves
be formed by engaging the angle selector groove 468
with the transverse member and similarly 45 degree and
pin hole 44 is formed through the angle arm midway
30 degree angles can be formed using the angle selector
between its straight edges 42 and close to one end. The
pin 20 extends upwardly through the through-slot 32 in 50 grooves 46C, 46D respectively.
When not in use, the drawing instrument can be fold
the transverse member and then through the pin hole 44
ably arranged into a compact unit for ease in storing or
in the angle arm. The pin 2% can be moved longitudinally
arm to be positioned across the length of the transverse
member between the end members.
38 with the squaring edges 34 lying in parallel arrange
The portion of the angle arm 1e which extends angular
ment
with the straight edges 26. Since the width of the
ly from the transverse member is beveled along its straight
end members is less than that of the transverse member
edges 42 and has scales marked thereon. The transverse
when they are in this rotated position, they will not ex
member is not beveled on its upper face so that the angle
tend beyond the sides of the transverse member.
60
arm is supported across its width.
While the end members are positioned in contact with
In FIGS. 7 and 8, a group of four angle selector grooves
the lower face of the transverse member, the angle arm
46A, 46B, 46C, 461) are shown in the lower face of the
18 contacts the ‘upper face of the transverse member and
angle arm 14‘; arranged in nested stepped relationship.
is also rotatable about the connecting pin it} so that the
The angle selector grooves 46A, 46B, 46C, asp‘ extend
longitudinal centerline of each can be positioned in co
across the width of the angle arm and are symmetrically ~ extending relationship. As with the end members, the
arranged about a transverse line passing through the cen
angle arm is not as Wide as the transverse member so
ter of the pin hole 44 and disposed perpendicularly to the
that it does not extend beyond the sides of the transverse
straight edges 4-2. In addition they are symmetrically
member. Therefore, when not in use, both the end
arranged about the longitudinal centerline of the angle 70 members and the angle arm can be foldably arranged on
the transverse member to provide a simple compact unit.
arm.
In FIG. 10, another embodiment of the invention is
The grooves 46A, 456B, 46C, 46D are nested within one
another with each groove having both a di?erent width
illustrated by which the angle arm can be positioned with
and depth than its companions. Because of their varia~
relation to the transverse member. The portions of this
tions in width and depth and their symmetrical arrange
embodiment not shown are the same as set forth in FIGS.
3,085,344
5
149. For purposes of identifying the elements of the
embodiment shown in ‘FIGS. 10-15, the same reference
numerals as used in FIGS. 1-9 will again be used with
the addition of a pre?x 1.
A longitudinal groove 128 is formed across the length
of the transverse member 112. Within this groove 128
and extending along its length in parallel relationship is
6
the angle arm would ?t over the protuberances on the
transverse member.
In both of the embodiments described herein, the angle
arm is positioned with relation to the transverse member
by means ‘of straight sided grooves or groove-like recesses
in the angle arm matchingly ?tting over the straight edges
of the transverse member or the straight sided protuber
a pair of narrow channels 128A [formed to provide a
ances of the slide member. These straight sided inter
track-like arrangement.
locking elements are of prime importance in accurately
Extending between the groove
and the upper face of the transverse member is a narrow 10 positioning the angle arm with relation to the transverse
through-slot 132 similar in length to that shown in
member. The tolerances normally resulting from form
FIG. 2.
ing the interlocking elements or from normal wear dur
ing use do not a?ect the accurate angular positioning of
tudinal groove 128 and the narrow through-slot 132. A
the angle arm. The straight sided relationship of the
pair of upwardly extending ?ngers ‘152 run longitudinally 15 interlocking elements avoids the looseness and relative
along the slide member 150 and ?t into the narrow chan
slipping which results where round interlocking elements
nels 128A. This slide member 150 is held in tightly ?tting
are used.
sliding relationship ‘with the transverse member so that it
In view of the drawings and the description, it can
may be moved along the length of the through-slot ‘132.
readily be seen that the drawing instrument :10 provides
The pair of ?ngers 152 act as guides in the track-like ar 20 an ef?cient, accurate and easy to use drafting or sketching
rangement provided by the channels 128A.
tool in a simple, compact unit. Since the end members
On top of and integral with the slide member a pair
are movably positionable along the transverse member,
of upwardly projecting, straight sided protuberances 154
they will ?t sketch pads within a range odf widths. Pri
are formed. The long dimension of these protuberances
marily, the drawing instrument is adapted for use with
is' in alignment with the length of the transverse member. 25 sketch pads that are of sizes that can be easily carried in
As illustrated in FIG. 11, the protuberances 154 extend
a letter-size folder or briefcase such as 81/2" x 11" or
above the top of the slide member which is ?ush with the
8" x 13" pads.
upper face of the transverse member. A hole 1516 ex
The squaring edges 34 of the end members 14 permit
tending through the slide member is arranged on its
the ‘drawing instrument to be moved up or down the pad
A slide member 150 is positioned within the longi
longitudinal centerline between the protuberances. The 30 while maintaining the straight edges of the transverse
lower portion of this hole is countersunk.
member perpendicular to the side of the pad. The squar
The angle arm 118 is similar in general arrangement
ing edge extends a su?icient distance on either side of the
to the showing in FIG. 2, however, the means for posi
end member to provide both stability and accuracy con
tioning the angle arm with relation to the transverse
sidering any normal variation in pad widths. Since the
35 end members ?t closely to each side of the pad, parallel
member is different.
A knob 158 is arranged on top of the angle arm. This
lines may be drawn with the straight edge of the trans
knob can be either formed with the angle arm or in
verse member without either holding the instrument or
tegrally attached to it. A circular opening '160 is formed
exerting lateral pressure against one of the end members.
through the knob and the angle arm, with the portion of
While the transverse member permits the drawing of
the opening within the knob having a greater diameter 40 parallel lines across the sketch pad, lines either normal
than that in the single arm.
to or at a number of predetermined angles to these par
To attach the angle arm to the transverse member, a
allel lines can be drawn With the angle arm. In addition,
rivet 162 extends downwardly through ‘the opening 160
since the angle arm is movably positionable across the
and ?ts tightly over a pin 164 extending upwardly through
transverse member it is also possible to draw parallel
hole 156 in the slide member. The pin 164 is held in 45 lines with the angle arm.
place by its head which seats within the countersunk por
In this description, the transverse member and angle
tion of the hole 156. The head of the rivet 162 just ?ts
arm have been identi?ed as being made of transparent
within the opening 160 flush with the top of the knob. A
plastic material, while this is a preferred material the
spring 166 is positioned about the pin and rivet within
drawing instrument could as effectively be made of a
the larger diameter portion of the opening 160 to hold 50 meltal or other durable, though non-transparent, mate
the angle arm in position against the transverse member.
ria .
At its upper end, the spring bears against the rivet and
While this drawing instrument has been shown and
at its lower end it is seated within an annular groove.
described in combination with a sketch pad, it could also
A number of diametrically opposed pairs of straight
be used with a drawing board either of a size compara
sided, groove~like recesses 168A, B, C, D, E arranged in 55 ble With the sketch pads we have mentioned or larger.
a circle are formed in the lower face of the angle arm.
These recesses are formed to matchingly ?t the straight
sided protuberances on the slide member and are adapted
to seat over them in tightly ?tting relationship. The angle
arm can be positioned with relation to the transverse
member by engaging the protuberances within a pair of
Additionally, the transverse member and angle arm could
lge used as a drawing instrument without the end mem
ers.
‘It will also be understood that the number of prede
termined angles which can be drawn are not limited to
the‘number shown herein but may be either increased or
decreased.
If the protuberances are engaged by the pair of re
While in accordance with the provisions of the statutes,
cesses 168A, the angle arm will be held in position at
I have illustrated and described herein a speci?c form
right angles to the transverse member. In counterclock 65 of the invention now known to me, those skilled in the
wise order, as shown in FIG. 15, recesses 168A, B, C will
art will understand that changes may be made in the
position the angle arm at angles of 60, 4S and 30 degrees
form of the apparatus disclosed without departing from
respectively with the transverse member. When the pro
the spirit of the invention covered by my claims and that
tuberances are engaged within recesses 168E, the angle
certain
features of the invention may sometimes be used
‘arm will lie along the transverse member in axial align 70
to advantage without a corresponding use of the other
ment therewith.
features.
For purposes of this invention, the protuberances 154
What is claimed is:
on the slide member could also be formed on the trans
the recesses.
1. A drawing instrument comprising an elongated
In such an arrangement, the slide mem
her would not be required and the groove-like recesses of 75 transverse member having at least one longitudinally
verse member.
7
t3
extending straight edge, an angle arm having at least
tional engagement and thus’ hold the longitudinal posi
one longitudinally extending straight edge, pin connecting
tion of said angle arm in vsaid‘transverse member where
by said angle arm is positionable in interlocking engage
means pivotally attaching said angle arm to said trans
verse member whereby said angle arm is movably po
ment relative to said transverse member in a plurality
sitionably longitudinally along said transverse member,
of predetermined circumferentially spaced positions form
and spring means in combination with said pin connect
ing means urging said angle arm into interlocking en
ing a number of different selected angles therewith.
5. A drawing instrument comprising an elongated
gagement with said transverse member, said spring means
also arranged to urge said angle arm and transverse mem
tending straight edge and also having a longitudinal groove
ber into frictional engagement and thus hold the longi
tudinal position of said angle arm in said transverse
member whereby said angle arm is positionable in in
located therein and extending therealong, a slide member
engageable with said transverse member within the groove
therein in tightly fitting relationship and having a pro
terlocking engagement relative to said transverse mem
ere in a plurality of predetermined circumferentially
spaced positions forming a number of different selected
angles therewith.
2. A drawing instrument comprising an elongated
transverse member having at least one longitudinally
extending straight edge, an angle arm having at least
one longitudinally extending straight edge, said angle
transverse member having at least one longitudinally ex
tuberance extending upwardly therefrom, a pair of end
members engageable with said transverse member within
its groove and movably positionable therealong, connect
ing means to attach said end members to said transverse
member, each of said end-members having a squaring
edge arranged in opposed spaced parallel relationship with
the other and disposed at right angles to the straight
edge of said transverse member, an angle arm having at
least one longitudinally extending straight edge and also
having a number of straight sided grooves therein, pin
connecting means pivotally attaching said angle arm to
to said transverse member whereby said angle arm is
saidslide member whereby said angle arm is movably
movably positionable along said transverse member, and
spring means in combination with said pin connecting 25 positionable along said transverse member, and spring
arm having a number of straight sided grooves therein,
pin connecting means pivotally attaching said angle arm
means urging the grooves in said angle arm into inter
locking engagement with said transverse member, said
spring means also arranged to urge said angle arm and
transverse member into frictional engagement and thus
hold the longitudinal position of said angle arm in said
transverse member whereby said angle arm is position
able in interlocking engagement relative to said trans
verse member in a plurality of predetermined circumfer
means in combination with said pin connecting means
urging the grooves in said angle arm into interlocking en
gagement with the protuberance of said slide member,
whereby said angle arm is positionable in interlocking
engagement relative to said transverse member in a plu
rality of predetermined circumferentially spaced posi
tions forming a number of different selected angles there—
with.
v
6. A drawing instrument comprising an elongated trans
entially spaced positions forming a number of different 35 verse member having an upper and a lower face, said
selected angles therewith.
transverse member having a pair of longitudinally extend
3. A drawing instrument comprising an elongated
ing straight edges arranged in parallel relationship, lon~
transverse member having at least one longitudinally ex
tending straight edge, said transverse member ‘having a
gitudinally extending straight edges arranged in parallel
relationship, a longitudinally extending groove ‘of rectan
longitudinal groove therein, a pair of end members en 40 gular cross-section disposed in the lower face thereof and
gageable with said transverse member within the longi
a corresponding narrow longitudinally extending through
tudinal groove thereof and movably positionable there
slot positioned along the longitudinal centerline of the
along, connecting means attaching said end members to
groove and communicating between the upper face of said
said transverse member, each of said end members having
transverse vessel and the groove, a pair of end members
a squaring edge arranged in opposed spaced parallel re
each having an upper face a lower face and a squaring
lationship with the other and disposed at right angles
edge, Walls upwardly extending from the upper face of
to the straight edge of said transverse member, an angle
each of said end members forming a tongue disposed nor
arm having at least one longitudinally extending straight
mally to the squaring edge thereof, the tongue on said end
edge and also having a number of straight sided grooves
members having a cross~sectional shape similar to said
‘therein, pin connecting means pivotally attaching said an 50 longituidnal groove and engageable therein, the squaring
gle arm to said transverse member whereby said angle
edge of each of said end members arranged in normal
arm is movably positionable along said transverse mem
operating position in opposed spaced parallel relationship
ber, and spring vmeans in combination with said pin con
at right angles to the squaring edges of said transverse
necting means urging the grooves in said angle arm into
member, ?rst connecting means extending through said
interlocking engagement with said transverse member, 55 through-slot attaching said end members to said transverse
whereby said angle arm is positionable in interlocking
ember whereby the end members are movably position
engagement relative to said transverse member in a plu
able along said transverse member and rotatable about
said ?rst connecting means, an angle arm having an upper
forming a number of different selected angles there
face a lower face a number of angle selector grooves in
with.
>
60 the lower face and a pair of parallel longitudinally ex
rality of predetermined circumferentially spaced positions
4. A drawing instrument comprising an elongated
transverse member having at least one longitudinally ex
tending straight edges, second connecting means extend
ing through the through-slot of said transverse member
pivotally attaching said angle arm to the upper face of
tending straight edge, said transverse member having a
said transverse member, and spring means in combina
longitudinally extending groove therein, a slide member
situated within and movable along the groove of said 65 tion with said second connecting means urging the grooves
in the lower face of said angle arm into interlocking en
transverse member, an angle arm having at least one
longitudinally extending straight edge and also having
gagement relative to said transverse member in a plu
rality ‘of predetermined circumferentially spaced posi
.a number of straight sided grooves therein, pin connect
ing means pivotally attaching said angle arm to said slide
tions forming a number of different selected angles there
member whereby said angle arm is movably positionable 70
with.
along said transverse member, and spring means in com- '
bina-tion with said pin connecting means urging the
grooves in said angle arm into interlocking engagement
with said slide member, said spring means also arranged
to urge said angle arm and transverse member into fric 75
.
7. A drawing instrument for use with a sketch pad
comprising a thin transverse member of su?icient length
when positioned on the sketch pad to extend beyond the
sides thereof, said transverse member having at least one
longitudinally extending straight edge to be positioned
3,085,344
perpendicularly to the sides of the pad, a pair of end
members each having a squaring edge arranged in lop
posed parallel relationship and adapted to bear against
the sides of the pad in closely ?tting relationship, said
‘end members engageably attached to and movably posi
tionable along said transverse member to fit sketch pads
of varying width, an angle arm having at least one longi~
tudinal extending straight edge, pin connecting means
parallel relationship with the other and adapted to bear
against the side of the pad in closely ?tting relationship,
upwardly extending Walls forming a tongue extending
across each of said end members and arranged perpen
dicularly to the squaring edges thereof, ?rst pin connecting
means pivotally attaching said end members to said trans
verse member with the tongues of the end member en
gageable within the groove of said transverse member
pivotally attaching said angle arm to said transverse
whereby the end members are movably positionable
member, said angle arm having a number of straight 10 across and rotatable about said transverse member so
sided grooves formed therein, and spring means in com
that the tongues of said end members are also engage
bination with said pin connecting means urging the
able Within the athwart grooves of said transverse mem
grooves in said angle arm into interlocking engagement
her, an angle arm having a pair of longitudinally ex
relative to said transverse member in a plurality of pre
tending straight edges in parallel relationship, second pin
determined circuimferentially spaced positions ‘forming 15 connecting means pivotally attaching said angle arm to
a number of different selected angles therewith,
said transverse member, said angle arm having circum
8. A drawing instrument for use with a sketch pad and
ferentially spaced diametrically opposed pairs of straight
arranged to provide a compact unit for ease in carrying
sided grooves formed therein, and spring means in com
and storing comprising a thin transverse member posi
bination with said second pin connecting means selective—
tioned across the sketch pad and having each of its ends 20 ly urging individual pairs of the grooves in said angle
extending beyond the sides of the pad, said transverse
arm into interlocking engagement with the protuberances
member having a pair of straight edges ‘arranged in paral
lel relationship and disposed normally to the sides of the
on said slide member to locate the angle arm in a plurality
of circumferentially spaced positions with relation to the
pad, said transverse member having a longitudinally ex
transverse member to form therewith a number of dif
tending groove situated along said transverse member in 25 ferent selected angles therewith, one or" the pairs of
parallel relationship with the straight edges thereof and a
grooves in said angle arm arranged to locate the angle
pair of longitudinally extending channels formed in the
arm in longitudinal alignment with the transverse mem
groove acting as a track, said transverse member also hav
ber.
ing a pair of spaced ath-wart grooves extending across the
width of said transverse member at right angles to said lon 30
References Cited in the ?le of this patent
gitudinal groove and a through-slot smaller in Width than
UNITED STATES PATENTS
the groove and co-extensive and communicating there
429,203
Sajous ______________ __ June 3, 1890
with, a slide member arranged to slide on said track said
814,789
Machintosh __________ __ Mar. 13, 1906
transverse member whereby said slide member is en
gageable with said transverse member in tightly ?tting 3 UK
sliding relationship, walls forming a pair of protuberances
1,172,631
2,871,567
Prout _______________ __ ‘Feb. 22, 1916
Casten ________________ __ Feb. 3, 1959
366,311
Great Britain ___' ______ __ Feb. 4, 1932
extending upwardly from said slide member to a point
above said transverse member, a pair of end members
each having a squaring edge arranged in opposed spaced
FOREIGN PATENTS
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