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Патент USA US3074183

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Jan. 22, 1963
c. H. LITTLE
3,074,173
DRAFTING APPARATUS
Filed Feb. 9, 1959
3 Sheets-Sheet 1
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INVENTOR.
01424517065420 [1777.5
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ATTOPNE Y5
Jan. 22, 1963
c. H. LITTLE
3,074,173
DRAFTING APPARATUS
Filed Feb. 9. 1959
3 Sheets-Sheet 2
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INVENTOR.
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M” Cannes/{vamp l/rrze
BY
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Jan. 22, 1963
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c. H. LITTLE
3,0 74,1 73
DRAFTING APPARATUS
Filed Feb. 9. 1959‘
3 Sheets-Sheet 3
btates Fatent
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Patented Jan. 22, 1%53
2
3,074,173
DRAFHNG APPARATUS
Charles Hubbard Little, Pepper Pike, @hio, assignor to
Universal Drafting Machine Corporation, Cleveland,
llhio, a corporation of Ohio
Filed Feb. 9, 1959, ger. No. 792,tl75
It’) Claims. (Cl. 33—76)
stood that the invention is not limited to the construc
tions and arrangements of the parts shown and described,
but is capable of being otherwise embodied and of being
practiced and carried out in various ways.
Referring to the drawings, the apparatus shown therein
comprises a pair of rulers A, 3 extending at right angles
to one another and movable over the working surface of
a drafting table or board C. The rulers, commonly called
The present invention relates to so-called “drafting ma
drafting machine scales, are detachably connected to a
chines” and more particularly to drafting machines hav~ 10 ruler supporting member D pivotally connected to a pro
ing one or more straight edges, rulers, triangles, etc., con
tractor assembly or protractor E for movement or adjust
nected to a member movable upon a linear track.
ment about an axis normal to the surface of the board
In the machines of the character referred to, the ruler
C. The protracto-r E comprises a ?exible attachment
or rulers, etc., are usually pivotally connected to the
plate or blade which is in turn detachably connected to a
member, which member is in turn movable upon the 15 “Y” carriage F movable upon a linear “Y” beam or rail
linear track and the member which provides the track is
C- extending downwardly from the upper edge of the
in turn movable upon a second linear track positioned at
board C, as viewed in the drawings at right angles thereto.
right angles to the first.
One of the principal objects of the invention is the
The vertical beam G is pivotally connected, for oscil
lation about an axis generally parallel with the upper
provision of a new and novel drafting machine or like ap 20 edge of the board C, to a second or “X” carriage H mov
paratus of the character referred to which will be simple,
able upon a linear “X” earn or rail J extending generally
stable and rugged in construction and therefore accurate
parallel with the upper edge of the board C and at right
in operation, economical to manufacture and maintain,
angles to the length of the vertical beam G. The beams
and low in friction, light in weight and therefore ex
G, J are preferably made of extruded aluminum alloy
25 and in such a shape that they are extremely resistant to
tremely easy to operate.
Another object of the invention is the provision of a
de?ection or distortion, etc. in all directions. The hori
new and novel drafting machine or like device of the
zontal rail beam I is connected to the board C at only
character mentioned, which can be readily manufactured
two spaced points so that warpage and other distortion
for use with boards of any practical size and in which ma
of the board C will not be imparted to the beam. With
chine there will be a minimum of de?ection and sag al
this construction the normal come and go- inherent in
though the rail members are supported at only two points.
drafting boards and tables will not be re?ected in the hori
Another object of the invention is the provision of a
zontal beam .l.
new and novel drafting machine or like device compris
The beams G, J are identical in construction and each
ing an “X” or “Y” beam or rail having a relatively nar
comprises a length of beam the cross-sectional shape of
row centrally located track along which the “carriage” 35 which is clearly shown in FIG. 3 and which resembles
moves and wherein the track proper is enclosed and thus
somewhat the shape of a conventional l-beam, in that it
protected against dirt, damage, etc.
has a central web l5’ and pairs of flanges 17, 1% and 20,
Another object of the invention is the provision of a
21 adjacent to opposite longitudinal edges of the web
new and novel drafting or like device of the character
projecting to opposite sides thereof. The beam is sym
40
referred to having a counterweight movably supported in
metrical about its longitudinal, central plan normal to
the “Y” beam or rail and connected to the carriage mov
its web, with the result that the ?anges on either side of
able along the rail or track to provide proper balance at
the web are alike. In addition to the edge flanges 17, 13
all board angles automatically and which does not over
and Eli, 211 each beam has a further longitudinal ?ange Z2
hang the board and is completely out of the way at all
projecting from the top side of the web 15 as viewed in
times.
PEG. 3 and located midway between the ?anges 17, 26},
The invention resides in certain novel constructions
that is, the edge ?anges on the same side of the web as
and arrangements of parts, and further objects and ad
the flange 22. The flange 22 is relatively narrow com
vantages will appear from the following description of
pared to the width of the beam, being never more than
the preferred embodiment described with reference to the
one-half the width of the beam and preferably being
accompanyinG drawings, which form a part of this speci
about one-eighth the width of the beam as is the case in
?cation, and in which like reference characters designate
the embodiment shown. The opposite sides of each of
corresponding parts throughout the several views, and
the ?anges 22 are accurately machined to provide pairs of
wherein:
longitudinally extending transversely spaced main guide
FIG. 1 is a fragmentary plan view of a drafting table
surfaces
which form an accurate straight or linear guide
or board having a drafting machine embodying the pres 55 way or track along each beam for the carriages.
ent invention attached thereto;
The carriage F which is generally rectangular as viewed
FIG. 2 is an enlarged fragmentary plan view with por
in plan, is guided along the flange 22 of the vertical beam
tions broken away and in section of the drafting machine
rail G by four wheels or rollers 23, 24, 25, 26 at the
shown in H6. 1;
60 under side of the frame member 27 of the carriage and
H6. 3 is a sectional view with portions in elevation
connected to the frame member of the carriage adjacent
approximately on the line 3—3 of FIG. 2;
to the upper and lower ends thereof as viewed in H6. 2.
FIG. 4 is an enlarged sectional view with portions in
The wheels or rollers 23, 24, 25, 26 shown are in fact
elevation approximately on the line 4—-¢t of FIG. 3;
the outer races of anti-friction ball type bearings, the
PEG. 5 is an enlarged sectional view with portions in 65 inner races of which are ?xedly secured to the lower end
elevation approximately on the line 5——5 of FIG. 2;
of pins or stud shafts 3h, 33, 32, 33, respectively, pro
E16. 5 is an enlarged sectional view with portions in
vided with upwardly projecting bosses all of which but
elevation approximately on the line 6—6 of FIG. 2; and
one, in this instance the shaft 33, is eccentric to the axis
FIG. 7 is a fragmentary sectional view approximately
of the respective wheel carried by the shaft.
on the line 7'—7 of FIG. 2.
The shafts 3b, 31, 32, 33 are provided with enlarged
70
Although the preferred embodiment of the invention
heads at their lower ends against which the inner race of
is herein shown and described in detail, it is to be under
the bearing which forms the wheel carried thereby en
3,074,173
3
‘gages. The upper reduced ends of the shafts are threaded
and project through suitable holes in the frame 27 of the
carriage where they are provided with nuts 36 by which
the shafts may be ?xedly secured to the frame. Suitable
washers may be interposed, if desired, between the lower
and upper ends of the inner race of each bearing and the
head of the shaft and the adjacent portion of the under
4
will engage the lower surface of the member 50 with the
bottom of the groove 53 to lock the carriage F to the
beam rail G. Rotation in the opposite direction will
allow the member 50 to be moved free of the lower sur
face of the groove 53 by the resiliency of the member 51
to which it is attached to return the carriage.
The downwardly projecting ?anges 18, 21 on the under
side of the rail G include outwardly projecting ?anges
side of the frame 27. A look washer is preferably em
69, 61 and inwardly projecting ?anges 62, 63, respectively.
ployed underneath the nut 36. A slot in the upper pro
jecting end of the reduced portion of each of the shafts 10 The latter ?anges have inwardly facing V-shaped grooves
64, 65 which provide second supplemental guide surfaces
facilitates angular adjustment of the shafts when the re
forming trackways for wheels 66, 67 connected to and
spective nut 36 employed therewith loosened.
forming a part of a counterweight K used in connection
The fact that the three shafts 3t}, 31, and 32 are sup
with the vertical rail G. ‘Opposite ends of the counter
ported by eccentric portions thereof in the frame 27, pro
vides means for adjusting the carriage F and in turn the 15 weight K are connected to opposite ends of the carriage
F by web-like ?exible bands 68, 69 which are looped or
rulers etc. connected thereto, relative to the guideway
reeved about suitable rolls or pulleys 7t}, 71 rotatably sup
for the carriage formed by the opposite sides of the ?ange
ported in brackets connected to opposite ends of the
22. In assembling or setting up the device the two shafts
beam G. In addition to providing a means for connect
30, 31 at the left hand side of the ?ange 22 may be ad
justed to provide clearance between the wheels carried
thereby and the adjoining side of the ?ange. The shaft
32 may be thereafter adjusted to obtain the desired angu
lar relationship between the carriage and the track and
the shafts 30, ‘31 subsequently adjusted to cause all of
the wheels to ?rmly engage the ?ange 22. Alternatively, 25
ing the counterweight K to the carriage F the webs 53, 69
enclose the upper and lower sides of the beam, thereby
providing a neat appearance and assisting in preventing
one of the shafts 3d, 31 may be omitted and the retained
shaft relocated intermediate the shafts 32, 33. The shafts
projection of the ?ange 22 from the web 15 is preferably
less than the projection of the side ?anges 17, 20 which
assists in protecting the guideway or tracks thereon from
32, 33 are preferably widely spaced lengthwise of the rail
the entrance of dirt and otl er undesirable objects into the
top side of the beam where they might interfere with the
accurate movement of the carriage along the beam. The
damage etc.
widely spaced points of contact with the rail and thereby 30 From the foregoing description of the manner in which
the carriage F is supported and counterbalanced on the
reducing the tendency of the wheels carried thereby to
beam G it will be evident that friction has been reduced
bind on the track, etc. The spacing should be at least
relative to one another so as to provide two relatively
two or more times the width of the ?ange Z2 and in the
to a minimum and that the carriage is extremely free to
be moved along the beam with minimum effort on the
embodiment shown is approximately ten times the ?ange
35 part of the operator. This is accomplished in part by
width.
the use of ?at parallel guideways or tracks on opposite
The ?anges l7 and 20 on the upper sides of the beam
sides of the ?ange 22 and in part by the use of a narrow
which form the vertical beam G have portions 4%, 41
?ange for the guideway or track relative to the spacing
turned inwardly to overhang the side edge of the central
between the upper pair of rollers 23, 26 and the lower
web 15 adjacent thereto, thereby providing discrete sup
pair 24, 25. It will also be noted that the outrigger
plemental guide surfaces or guideways along opposite side
rollers 42 to 45 are on the centerline of the track and
edges of the beam for a plurality of “outrigger” rollers
there are no forces between the carriage F and the beam.
42, 43, 44, 45 connected to the frame 27 of the carriage F
G tending to produce inaccuracies in the apparatus. The
for rotation about axes parallel to the plane of the web
15.
As shown, the rollers 42 to 45 are rotatably con
fact that the carriage F is well counterbalanced and is
nected to outwardly projecting ends of stud shafts ?xedly 45 freely movable along the beam G makes it easy for the‘
operator to place the carriage F and in turn the rollers
secured in downwardly projecting bosses on the under
carried thereby in any desired position. The con?gura
side of the frame 27 by nuts threaded onto their inwardly
tion of the beam G reduces if not eliminates sag and other
‘projecting ends. The rollers 42 to 45 are located adjacent
distortions even though the beam may be of considerable
to the track rollers 23 to 26 respectively and prevent tilt
ing the carriage F relative to the beam or its removal 50 length.
The upper end of the beam G is provided with a bracket
therefrom. In other words, the rollers 42 to 45 maintain
75 detachably connected to its underside by screws 76
the carriage in assembled ?xed relationship to the beam
threaded into suitable tapped apertures in the outwardly
while leaving it free to travel lengthwise thereof and be
guided therealong by the guideways or tracks formed
extending ?anges 69, 61 of the beam. The bracket 75
along opposite sides of the central web 22. The nuts 36, 55 has a tubular cylindrical projection 78 at the right-hand
etc., are enclosed in a housing or cover member 46 de
side, as viewed in FIG. 2, and an hourglass shaped pro~
‘tachably connected to the frame 27 of the carriage F by
jection 79 at the left-hand side, which projections pivot~
ally connect the bracket 75 and in turn the vertical beam
The carriage F is adapted to be locked or clamped in
G to the frame 80 of the carriage H. The projections 78,
any position to which it is moved along the beam G by 60 ‘79 of bracket 75 engage within suitable apertures in up
suitable screws.
lock means including a brake or friction member 58 c0n~
nected adjacent to the free end of a resilient lever 51
standing ?anges 81, 82, respectively, of the frame 80 of
the “X” carriage H and are retained therein by cover
located at the lower side of the frame 27 of the carriage
members or hinge straps 83, 84 engaging thereover and
F and detachably connected thereto by screws 52. The
detachably connected to the upstanding ?anges 81, 82 by
‘friction member 50 normally travels freely in a groove 65 suitable screws. The construction is such that the upper
end of the beam G is cradled in the horizontal carriage H
53 formed in the upper side of the ?ange 22 but is
such that the lower end of the beam G may be raised
adapted to be vpressed into tight engagement with the bot
and lowered to pivot the beam about the axes of the
tom of ‘the groove by a screw 54 threaded in a tapped
bosses 78, 79. The hourglass shape of the projection 79
aperture in a ‘boss '55 projecting from the upper side of
the frame-27 of the carriage F. The lower end of the 70 prevents am'al momentum of the bracket 75 and in turn
the upper end of the beam G relative to the carriage H.
screw 54 abuts against the upper side of the member 51
The carriage H is similar in construction to the carriage
intermediate the ends of the member 5!} and its upper
F and is connected to the horizontal beam I in a similar
end projects outwardly through a suitable aperture in the
manner. The frame 80 of the carriage H is slightly
~cover46 where it is provided with a knurled wheel or
knob 56. Rotation of the knob 56 in the clamp direction 75 larger and different in certain other respects from the
5
3,074,173
frame of the carriage F. All material differences will be
referred to. As previously stated, the beam J at the
upper edge of the board C is similar to the beam G and
will not be described in detail. The corresponding parts
of the beam J are, however, designated in the drawings
'75 and the construction of the wedge 115, etc., is such
that oscillation of the lever 116 will cause the wedge 115,
which has a gradually increasing width, to be projected
and withdrawn from between the rollers 117, 118, thereby
causing the friction members 91, 92. to engage the ?anges
and will be referred to herein by the same reference char
46?’, Kid’ or to allow them to move away therefrom. The
acters employed with respect to the beam G, but having
a prime mark affixed thereto. The beam I extends along
member 1% is held against rotation in the boss '78 by
suitable ?anges on the wheel 117.
the upper edge of the board C and is connected thereto
Provision is made for oscillating the lever 216 about
at only two points as previously mentioned by two brack 10 its pivotal connection to the bracket 75 in the form of a
ets 85, 86 connected to the underside of the board and
rod
located in an outwardly facing groove in the
to the ?anges 6t)’, 61' of the beam in a suitable manner.
vertical beam G formed by the flanges 29, 23. The rod
The frame member 89 of the horizontal carriage H is
126 extends from a point adjacent to the upper end of
connected to the beam I in a manner similar to that in
the beam G to a point near the lower end of the beam
which the frame member 27 of the carriage F is con 15 and is slidably connected to the beam G by suitable spaced
nected to tl e beam G, and will not be described in de
brackets 12.1 positioned at desired locations along the left
tail. The corresponding parts, however, are designated
hand side of the vertical beam G, as viewed in FIGS. 1,
in the drawings by the same reference characters as those
2, 4 and 7. The upper end of the rod 123;; is connected
employed with respect to the carriage F but with a prime
to the end of the lever lid opposite to the end to which
mark a?ixed thereto. Since no counterweight similar to 20 the lever 115 is connected by a pin I122 ?xed in the rod
the counterweight K, previously referred to, is required
12d and engaging within a slot 123 in the lever lid.
with the horizontal beam J, a single web-like ?exible
The lower end of the lever 12b“ is provided with a grasp
band 9:“) is employed with the horizontal beam. The
12d projecting outwardly from the left-hand side of the
band as is reeved about suitable pulleys rotatably con
vertical beam G. The grasp 126 is located at a convenient
nected in opposite ends of the beam J and has its oppo 25 position along the vertical beam G and facilitates the con
site ends detachably connected to the frame member 8%}
venient clamping and unclarnping of the horizontal car
of the carriage H.
riage F with respect to the beam 3. Two brackets 121
The carriage H is adapted to be secured or locked in
located at opposite sides of the grasp 126 form stops
any position along the horizontal beam I by friction mem
which limit movement of the rod iii-‘ll along-the beam G.
bers 91, d2, somewhat similar to the friction member 5%
One of the advantages of the mechanism just described
previously referred to, connected to the upper side of the
for locking the horizontally movable carriage H to the
free end of ?exible resilient members 93, 94 having ?anges
horizontal beam I is the fact that the vertcial beam G
integral therewith and by which they are detachably con
can be disconnected from and reconnected to the carriage
nected to the frame member 89 of the horizontal car
H by merely removing and replacing the members 33,
riage H adjacent to the upper and lower sides thereof by 35 84 which overlie the projections '78, ‘215 of the carriage
suitable screws. The friction members 91, 92 underlie
frame member ?ll.
the inwardly projecting flanges so’, 41', respectively, at
in the particular apparatus shown in H6. l, the lower
the top side of the web 15' of the beam I and are adapted
edge of the drafting board or table C is provided with a
to be moved upwardly into engagement therewith by
lever members 95, 96 secured to the outwardly projecting
ends of short shafts Hill, 1M rotatably supported in down
wardly projecting bosses on the underside of the frame
longitudinally extending metal bar-like member 139, pref
erably made of extruded aluminum whic l forms a guide
way for rollers, not shown, connected to the bracket at the
lower end of the vertical beam. G which supports the pulley
member
The inner ends of the shafts 1%, 1d} are
7%. This facilitates movement of the vertical beam G rela
connected to downwardly projecting arms of a lever m2,
tive to the board C.
which lever is carried by the shafts 100, 1%. The lever 45
The rulers A, B, the ruler supporting member D, and
has an upwardly projecting arm 103 provided with
the protractor E form an assembly, commonly referred
a pin lt’id projecting therefrom in a direction parallel with
to as a drafting machine head, which is detachably con
nected to the “Y” carriage P and may be removed as a
the axis of the shafts 1%, TM. The projecting end of
the pin 1.534 extends into a peripheral groove in a wheel
unit. The particular drafting machine head shown, per
like member 1&5 ?xedly connected to the end of a mem
se, forms no part of the present invention and can be
ber 16-6 slidably supported in the boss 78 of the bracket
75', previously referred to. A tension spring 110 con
replaced by any desired different drafting machine head.
nected to a projection ill on the lever m2 and to an up
The head shown is commercially available and is shown
in US. patent to Charles Hubbard Little et al., No.
2,552,335, where it is shown connected to the free end of
standing member 112 on the frame member 8a’; of the
carriage H continuously biases the lever in a counter 55 a band type parallel motion arm. In order to facilitate
or to assure that the rulers A, B, or whatever other in
clockwise direction as viewed in FIG. 5; that is, in a
struments are connected to the vertically movable car
direction to allow the friction members 91, 92 to occupy
riage F, will lie ?at on the board C, the attachment means
positions free of the flanges Ali)’, 41', under the resiliency
of the members 93, 9d. Movement of the lever 102 by
for
of the
connecting
carriage F
theis assembly
preferablyE?exible
to the in
frame
the plane
member
of the
the spring 110 is limited by a collar-like spacer 113 inter 60
board. In the embodiment shown this means is in the
posed on the member 1% between the wheel-like mem
form of a plate or blade 1E1 having two slots within
ber 1% and the adjacent side of the upstanding part 81
which two screws carried by the frame 27 of the carriage
of the frame member 80 within which the boss 73 is
rotatably supported.
F engage to detachably secure the drafting machine head
The member ms is adapted to be moved toward the 65 E to the carriage. The screws project upwardly through
the frame 27 and are provided with wing nuts 132, 133
right as viewed in FIGS. 2 and 5 to pivot the lever 102
to facilitate detaching the drafting machine head being
and in turn, the levers 95, 96 in a direction opposite to the
used at any particular time.
action of the spring Illi?; that is, in a direction to engage
As will be readily appreciated, the scales A, B are of
the friction members 91, 92 with the ?anges 4f)’, 41' by
an arcuate shaped member or wedge 115 of gradually 70 limited length, usually 12 to 18 inches, and in order to
increasing width pivotally connected to one end of a
facilitate the making of large layout drawings, etc., with
walking beam-type lever 116 and having its narrow, free
no accumulative error due to repeated scale extensions,
end projecting between the roller 117 carried by the
etc. the present invention provides a plurality of track
settings along both the “X” and “Y” beams in the form
member 1% and a roller 118 connected to the bracket
'75. The lever 116 is pivotally connected to the bracket 75 of graduations Mb, 141 along the inner beveled edges
3,074,173
77
of the rail beams G and 5, respectively. In the embodi~
rnent shown, these graduations are at ten inch intervals
and the respective carriers are adapted to be accurately
positioned with respect thereto by indicator members
142, 143 connected to the carriages F and H, respectively.
Each of the indicator members has a ‘ti-shaped notch in
the portion thereof which projects over the graduations
with which it cooperates, which notch is preferably three
times as wide as the width of the graduations. This con
struction provides a simple mechanical device for increas- d
9
0
Having thus described my invention, I claim:
1. In a drafting machine of the character referred to: a
relatively wide, ?at rail member having a ?rst longitudi
nally extending guide surface at one side of its longitudi
nal center line and ‘a second longitudinally extending guide
surface at the other side of its longitudinal center line;
said guide surfaces being on the same side of said rail
member, angularly disposed to the plane of said rail mem
ber, opposed to one another and spaced from the longi—
tudinal center line of said rail member less than the dis
tance that they are spaced from the side edges of said rail
member; a carriage adapted to have a drafting instrument
operatively connected thereto; means connecting said car
riage to said rail member for movement therealong; said
means comprising a pair of rollers in engagement with
said ?rst guide surface; means connecting one of said
rollers of said pair to said carriage for adjustment relative
tion appear equal to the eye. In this way, a setting can
to the other roller of said pair transversely of the length
be made repeatedly to less than .010 of an inch. The
of said rail member; means releasably securing said one
beam graduations in effect divide the drafting board into
a grid pattern which, in the preferred embodiment shown, 20 roller of said pair of rollers in adjusted position; a third
roller connected to said carriage and in engagement with
is a ten inch pattern. With this construction, different
said second guide surface; and means ‘for effecting relative
parts of a drawing can be worked upon with complete
adjustment between both of said rollers of said pair of
con?dence in the accuracy of one part relative to another,
rollers in engagement with said ?rst guide surface and said
regardless of the size of the drawing, since widely sep~
third roller in engagement with said second guide surface
arated reference points can be established with no accu
transversely of the length of said rail member.
mulative error.
ing the reading sensitivity of the indicator and the gradua
tions by a ratio of approximately 31/2 to l. in setting the
respective carriages the apex of the V-notch in the indica
tor connected thereto is brought over the beam gradua
tion and positioned so that the two triangles formed by
the notch and the graduation on either side of the gradua
From the foregoing description of the preferred embodh
. In a drafting machine of the character referred to, a
rail member having a relatively wide Web portion pro
ment of the invention, it is believed that it will be appar
vided with a pair of longitudinally extending transversely
ent that the objects heretofore enumerated and others have
been accomplished and that there has been provided a 30 spaced opposed guide surfaces at opposite sides of its lon
gitudinal center line, said guide surfaces being disposed at
new and novel drafting apparatus of the character de
an angle to the plane of said web and spaced from the
scribed which is economical to manufacture, is rugged in
longitudinal center line thereof less than the distance that
construction and which will maintain its accuracy under
they are spaced from the side edges of said rail member,
all normal uses. The fact that the rail members "e quite
wide and have the characteristics of an l-bearn assures 35 a carriage adapted to have a drafting instrument opera
against their distorting in use and the fact that the guide
surfaces for the respective carriages are relatively close
together with respect to the distance between the guide
tively connected thereto, means connecting said carriage
to said rail member for movement therealong, said means
comprising a pair of rollers connected to said carrier and
in engagement with one of said guide surfaces at one side
or track wheels at opposite ends of the carriages assures
their free and accurate movement along their respective 40 of said center line of said rail member and a third roller
connected to said carriage and in engagement with the
tracks.
other of said guide surfaces at the other side of said center
As previously stated, the rail beams have a cross sec
line of said rail member, means for adjusting one of said
tional con?guration which provides extreme rigidity and
rollers of said pair of rollers relative to the other roller of
lack of de?ection in all directions while being relatively
said pair in a direction transversely of the length of said
light in weight. The side ?anges projecting in opposite
rail member, means for releasably securing said one roller
directions from the side edges of the web of the beam
of said pair in adjusted position, and means for moving
provide stability against deflection of the rail beams in
said third roller relative to said carriage in a direction
the plane of the drawing board and are such that the
transversely of the length of said rail member.
vertical beam can span a relatively wide board without
3. In a drafting machine of the character referred to,
intermediate rollers or other supports which would tend 50
a rail member comprising a relatively wide web portion
to mar a drawing being made.
As also has been previously mentioned, the rail beams
are preferably made of extruded ‘aluminum alloy, and in
order to reduce the possibility of distortions occurring in
provided with a pair of longitudinally extending trans
versely spaced opposed guide surfaces at opposite sides of
its longitudinal centerline disposed at an angle to the plane
the beams subsequent to their manufacture, machining 55 of said web portion and supplemental guide surfaces ad
jacent to opposite side edges of said rail member, said
operations thereon are maintained at a minimum. To
guide surfaces of said pair being spaced from the longi
this end, the only parts of the rail beams shown which are
tudinal center line of said web portion less than the dis
tance that they are spaced from the side edges of said rail
in the form of a relatively low central projection on the 60 member, a carriage adapted to have a drafting instrument
operatively connected thereto, a pair of rollers in engage
web of the beam, its accuracy is maintained even though
ment with one of said pair of guide surfaces and con
the narrow sides thereof are machined. The outwardly
nected to said carriage for adjustment relative to one an~
projecting ?anges on the lower edges of the beams, in ad
other transversely of said rail member, means for releas
dition to adding stability, provide a convenient connection
for clamping the beams to the work table of the machine 65 ably securing said rollers in adjusted position, a third
machined are the straight tracks or guideways along op
posite sides of the narrow ?ange 22. Since this ?ange is
during the machining operation of the longitudinal guide
ways on the ?ange 22 in a manner which will not stress
the beams in a way which might cause inaccuracies.
roller in engagement with the other of said pair of guide
surfaces ‘and connected to said carriage for movement
/ transversely of said rail member, and means on said car
riage in engagement with said supplemental guide surfaces
Although the preferred embodiment of the invention
has been described in considerable detail, the invention is 70 adjacent to the side edges of said rail member.
4. In a drafting machine of the character referred to, a
not limited to the particular construction shown and it is
rail member having a relatively wide web portion pro~
the intention to hereby cover all adaptations, modi?cations
and uses thereof which come within the practice of those
vided with a pair of longitudinally extending transversely
skilled in the art to which the invention relates and within
spaced guide surfaces at opposite sides of the longitudinal
the scope of the appended claims.
75 centerline of the web portion and extending normal to the
3,074,173
.plane of said web portion and supplemental longitudinally
extending guide surfaces adjacent to the side edges of said
strument operatively connected thereto, means connecting
said second carriage to said second rail member compris
member disposed at an angle to said ?rst guide surfaces,
said guide surfaces of said pair being spaced from the lon
gitudinal center line of said web pontion less than the dis
tance that they are spaced from the side edges of said rail
member, a carriage adapted to have a drafting instrument
operatively connected thereto, a pair of rollers in engage
securing said second pair of rollers in adjusted position,
ment with one of said pair of guide surfaces and con
and ‘a sixth roller in engagement with the other of said
ing a ‘second pair of rollers in engagement with one of
said guide surfaces of said pair of guide surfaces on said
second rail member and connected to said second carriage
for relative adjustment with respect to one another trans
versely of said second rail member means for releasably
nected to said carriage for relative adjustment with respect 10 guide surfaces of said pair of guide surfaces on said second
to one another transversely of said rail member, means
rail member and connected to said second carriage for
for releasably securing said rollers in adjusted position, a
movement transversely of said second rail member.
third roller in engagement with the other of said pair of
7. In a drafting machine of the character referred to,
guide surfaces and connected to said carriage for move
a ?rst rail member having a relatively wide web portion
ment transversely of said rail member, and means on said 15 provided with a pair of longitudinally extending trans~
carriage engaging said supplemental, guide surfaces.
5. in a drafting machine of the character referred to,
a rail member having a relatively Wide web portion pro
vided on one side with a pair of longitudinally extending
transversely spaced opposed main guide surfaces at op
posite sides of the longitudinal centerline of the web por
versely spaced main guide surfaces at opposite sides of the
longitudinal centerline of the Web portion of said ?rst rail
member and disposed at an angle to the plane of said web
portion of said ?rst rail member and supplemental longitu
dinally extending guide surfaces adjacent to the side edges
portion and supplemental longitudinally extending guide
of said ?rst rail member disposed at an angle other than
90° to the plane of said Web portion of said ?rst rail mem
ber, said main guide surfaces of said ?rst rail member
surfaces at opposite sides of both edge portions of said rail
being spaced from the longitudinal center line thereof
tion and disposed at an angle to the plane of said Web
member disposed at an angle other than 90° to the plane 25 less than the distance that they are spaced from the side
of said web portion, said main guide surfaces being spaced
edge-s of said ?rst rail member, a ?rst carriage, a ?rst pair
from the longitudinal center line of said web portion of
of rollers in engagement with one of said main guide sur
said rm'l member less than the distance that they are
faces of said pair of main guide surfaces on said ?rst rail
spaced from the side edges of said rail member, a carriage
member and connected to said ?rst carriage for relative
adapted to have a drafting instrument operatively con 30 adjustment with respect to one another transversely of said
nected thereto, a pair of rollers in engagement with one
?rst rail member, means for releasably securing said ?rst
main guide surface of said pair of main guide surfaces
pair of rollers in adjusted position, a third roller in engage
and connected to said carriage for relative adjustment With
ment with the other of said main guide surface of said pair
respect to one another transversely of said rail member,
of main guide surfaces on said first rail member and con
means for releasably securing said rollers in adjusted posi
tion, a third roller in engagement with the other of said
nected to said ?rst carriage for adjustment transversely of
said ?rst rail member, means for releasably securing said
main guide surfaces of said pair of main guide surfaces
and connected to said carriage for movement transversely
riage engaging said supplemental guide surfaces on said
of said rail member, means on said carriage engaging said
‘supplemental 0uide surfaces on said one side of said rail
member, counterweight means movably supported on said
supplemental guide surfaces on the other side of said rail
member, and means extending around the top end of said
rail member connecting said carriage and said counter~
weight means.
'
6. In a drafting machine of the character referred to, a
?rst respectively Wide ?at rail member having longitudi
nally extending transversely spaced guide surfaces at
opposite sides of its longitudinal centerline and angularly
disposed to the plane thereof, said guide surfaces of said
third roller in adjusted position, means on said ?rst car
?rst rail member, a second rail member having a relatively
wide web portion provided with a pair of longitudinally
extending transversely spaced main guide surfaces at op
posite sides of the longitudinal centerline of the web por
tion of said second rail member and disposed at an angle
to the plane of said Web portion of said second rail mem
ber and supplemental longitudinally extending guide sur
faces adjacent to the side edges of said second rail mem
ber disposed at an angle other than 90° to the plane of said
web portion of said second rail member, said main guide
surfaces of said second rail member being spaced from the
longitudinal center line thereof less than the distance that
first rail member being spaced from the longitudinal center
line thereof less than the distance that they are spaced
they are spaced from the side edges of said second rail
member, a second carriage adapted to have a drafting in
from the side edges of said ?rst rail member, a ?rst car
strument operatively connected thereto, a second pair of
riage, means connecting said ?rst carriage to said ?rst rail
rollers in engagement with one of said pair of main guide
member comprising a ?rst pair of rollers in engagement 55 surfaces on said second carriage and connected to said sec
with one of said guide surfaces ‘of said pair of guide sur
ond carriage for relative adjustment with respect to one an
faces on said ?rst rail member and connected to said ?rst
other transversely of said second rail member, means for
carriage for relative adjustment With respect to one an
releasably securing said second pair of rollers in adjusted
other transversely of said ?rst rail member and a third
position, a sixth roller in engagement with the other of
roller in engagement with the other of said guide surfaces
said pair of main guide surfaces on said second rail mem
of said pair of guide surfaces on said ?rst rail member
ber and connected to said second carriage for adjustment
and connected to said ?rst carriage for movement trans
transversely of said second rail member, means for releas
versely of said ?rst rail member, means for releasably
ably securing said sixth roller in adjusted position, and
securing said ?rst pair of rollers in adjusted position, a
means ‘on said second carriage engaging said supple
second relatively wide flat rail member having longitudi
nally extending transversely spaced guide surfaces at op
posite sides of its longitudinal centerline and angularly
disposed to the plane of said second rail member, said
guide surfaces of said second rail member being spaced
mental guide surfaces on said second rail member.
8. In a drafting machine of the character referred to a
?rst rail member having a cross sectional shape resembling
that of an l-beam, said first rail member having on one
side a pair of longitudinally extending transversely spaced
from the longitudinal center line thereof less than the dis 70 guide surfaces at opposite sides of the longitudinal cen
tance that they are spaced from the side edges of said
terline of its web and disposed ‘at right angles to the plane
second rail member, means for pivotally connecting said
of said web portion and supplemental guide surfaces along
second rail member to said ?rst carriage for movement
both edge portions thereof and disposed at an angle to said
about an axis extending lengthwise of said ?rst rail mem
pair of guide surfaces, said guide surfaces of said pair
ber, a second carriage adapted to have a drafting in 75 being spaced from the longitudinal center line of said web
3,074,173
12
11
portion less than the distance that ‘they are spaced from
the side edges of said ?rst rail member, a ?rst carriage, a
?rst pair of rollers in engagement with one of said guide
surfaces of said pair of guide surfaces on said ?rst rail
member ‘and connected to said ?rst said carriage for rela
tive adjustment with respect to one another transversely
of the length of said ?rst ‘rail member, means for releas
tending opposed guide surfaces spaced with respect to one
another transversely of the rail member a distance less
than one-fourth the Width of the rail member, said guide
surfaces being angularly ‘disposed with respect to the plane
of ‘said rail member, a carriage adapted to have a draft
ing instrument operatively connected thereto, means con
necting said carriage to said rail member for movement
therealong, said means comprising a pair of rollers con
iably securing said ?rst pair of‘rollers in adjusted position,
nected to said carriage and in engagement with one of said
a third roller in engagement with the other of said guide
surfaces of said pair of guide surfaces on said ?rst rail 10 guide surfaces, means for adjusting one of said rollers of
said pair of rollers relative .to the other roller of said pair
member and connected to said ?rst carriage for adjust
in a direction transversely of the length of said rail mem
ment transversely of said ?rst rail member, means for
releasably securing said third roller in adjusted position,
ber, means for releasably securing said roller in adjusted
means on said ?rst carriage engaging said supplemental
position, a third roller connected to said carriage and in
engagement with the other of said guide surfaces, and
for moving said third roller relative to said carriage
in a direction transversely of the length of said rail
member.
10. In a drafting machine of the character referred to
‘guide surfaces on said ?rst rail member, a second rail
member having ‘a cross sectional shape resembling that of
an I-beam, said second rail member having on one side
a pair of longitudinally extending transversely spaced
guide surfaces at opposite sides of the longitudinal center
liue of its web and disposed at right angles to the plane of
said web portion and supplemental longitudinally ex
a relatively ‘wide, ?at rail member having longitudinally
extending opposed guide surfaces spaced With respect to
tending-guide surfaces on opposite sides of both edge por
tions of said second rail member angularly disposed to the
plane of said pair of guide surfaces on said second rail
less ‘than one-fourth the width of the rail member, said
member, said guide surfaces of said pair being spaced
the plane of said rail member, said rail member also hav
from the longitudinal center line of said web portion less
than the distance that they are spaced from the side edges
‘of said second rail member, means for pivotally connect
edges thereof, a carriage adapted to have a drafting in~
strurnent operatively connected thereto, means connecting
ing one end of said second rail member to said ?rst car
riage for movement about an axis lengthwise of said ?rst
rail member, a second carriage adapted to have a drafting
one another transversely of the rail member a distance
guide surfaces being angularly disposed with respect to
ing supplemental guide surfaces adjacent to opposite side
said carriage to said rail member for movement there
along, said means comprising a pair of rollers connected
to said carriage and in engagement with one of said guide
surfaces, means for adjusting one of said rollers of said
pair of rollers relative to the other roller of said pair in a
instrument operatively connected thereto, a second pair
of rollers in engagement with one of said guide surfaces
direction transversely of the length of said rail member,
of said pair of guide surfaces on saidsecond member and
means for releasably securing said roller in adjusted posi
connected to said carriage for relative adjustment with re
tion, a third roller connected to said carriage and in en
spect to one another transversely of said rail member,
gagement with the other of said guide surfaces, means
means for releasably securing said second pair of rollers
for moving said third roller relative to said carriage in a
inadjusted position, a sixth roller in engagement with the
direction transversely of the length of said rail member,
other guide surface of said pair of guide surfaces on said
second rail member and connected to said second carriage 40 and means on said carriage engaging said supplemental
guide surfaces.
for adjustment transversely of said second rail member,
means for releasably securing said sixth roller in adjusted
References Cited in the ?le of this patent
position, means on said second carriage engaging said
supplemental guide surfaces on the side of said second
UNITED STATES PATENTS
rail member upon which said pair of guide surfaces is lo
1,149,120
Fortune _____ _; _______ __ Aug. 3, 1915
cated, counterweight means movably supported on said
guide surfaces on the other side of said second rail mem
ber, means extending around opposite ends of said second
rail member connecting said second carriage and said
counterweight means.
'9, In a drafting machine of the character referred to a
relatively wide, ?at rail member having longitudinally ex
1,623,406
2,879,715
Hand _________________ __ Apr. 5, 1927
Bohlin ______________ __ Mar. 31, 1959
238,718
Germany ______________ __ Oct. 3, 1911
FORETGN PATENTS
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