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Патент USA US2404949

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July 30, 1946. `
H_ L_ DE LlSLE
2,404,949
ADJUSTABLE DRAFTING STAND
Filed Sept. 17, 1942
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July 30, 1946.
H_ L_ DE LlsLE
'
2,404,949
ADJUSTABLE DRAFTING STAND
Filed Sept. 17, 1942
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Patented July 30, 1946
2,404,949
UNITED STATES PATENT OFFICE
2,404,949
ADJUSTABLE DRAFTIN G STAND
Harold L. De Lisle, deceased, late of Sheboygan,
Wis., by William H. Murphy, executor, Chicago,
Ill.
Application September 17, 1942, Serial No. 458,634
10 Claims.
l
This invention relates to adjustable drafting
stands of the class in which the drawing board is
adjustable both vertically and angularly and.
more particularly, of the type wherein the dra-v -
ing board is maintained in its adjusted inclined
position by friction, and, in its adjusted vertical
position, is balanced by a spring adapted to be
adjusted to exert a controllable tension.
Among other objects, the present invention
(Cl. 45-131)
2
supporting structure for the board. The top I2
of the table may be used as one working surface,
accessible from one side of the table I0, which is
here referred to as the rear side, namely the side
opposite that at which the drawing board I I is
pivoted as next described. The drawing board I I
provides another working surface in the usual
way.
In accordance with the present invention, the
aims to provide an improved and simpliñed con~ il)
table ID at its ~front side carries for simultaneous
struction of this type including a novel gripping
vertical adjustment, as later more particularly ex
mechanism for the inclination of the drawing
board which may be released by a manual move
plained, a pair of hollow posts I9 and l2|) having
their free lower ends 2I slidingly passed through
ment by the draftsman, and, similarly, novel ten
a casing 22 carried at the front of the desk I il
sion means for the vertical adjustment of the 15 by and between the legs I3 and I4 thereof. rI'his
board which» may be operated by a movement of
the foot through a pedal device.
These and other objects and advantages will be
casing is here shown of about the width of the
legs and extending vertically thereof about one
third of the height of the legs, but preferably a
little nearer their tops than their feet. Bolts 23
apparent from the following description, taken
together with the accompanying drawings, in 20 may so secure the casing to the legs I3 and I 4. It
which_
will be noted that the table top I2 terminates at
Figure 1 is an end elevational view of a drafting
the front of the table adjacent the posts I9 and
stand embodying the present invention, showing
in full lines an inclined selected position of the
2B short of the legs I3 and I4 so as to accommo
date the posts in the plane of the legs.
drawing board, and, inbroken lines, a horizontal 25 Adjacent their tops, there is shown pivoted to
position thereof;
each of the vertically movable posts I9 and 20,
Figure 2 is an enlarged front elevational View
as at 24, a yoke-like or inverted U-shaped` bracket
of the structure of Fig. 1, parts being cut away for
25, which as best shown in Fig. 4, may be formed
clearness of description;
f
or” two angular sector-shape plates 25a and 25h
Figure 3 is an enlarged partial cross-section
having their flanges welded together as at 2G, one
taken on the line 3_3 of Fig. 2, and also being a
similar section on the line 3_3 of Fig. 4;
Figure 4 is a fragmentary view on the scale of
of the latter being extended as at 21 to be secured
as by screws 28 to the under face of the drawing
board I I, the board and brackets being reinforced
Fig. 3 of the left-hand side of Fig. 2‘ but with parts
adjacent thereto by the cross-cleats 29 also on
in cross-section taken on the line 4_4 of Fig. 3;
35 the under face of the board.
Figure 5 is an enlarged partial plan View taken
With the drawing board so arranged for angu
on the line 5_5 of Fig. 2;
lar movement on the pivots 24, frictiona1 or grip
Figure 6 is a similar View taken on the line 6_6
ping means are provided for holding the board at
of Fig. 2;
a selected angular adjustment whereby the board
Figure 7 is a partial vertical section on the scale 40 may be disposed either vertically or horizontally
of Fig. 5, taken on the line 1_1 of Fig. 5;
or at any intermediate angle therebetween. For
Figure 8 is a. similar View taken on the line 8_8
this purpose, there is shown secured to each of
of Fig. 6; and>
the posts i9 and 2Q, between the plates 25a and
Figure 9 is a detail section taken on the line
`25h of each of the yoke-like brackets 25 respec
9_9 of Fig. 2 somewhat enlarged.
45 tively, a segment plate 33 along the arcuate pe
Referring in detail to the illustrative construe
riphery of which is suitably secured an arch rail
tlon shown in the drawings, the numeral I9 in
3! having corrugations thereon, as by the screw
dicates in general a base for the drawing board
threads 32. A frictional mating member such as
indicated generally by the numeral l I. The base
the half-nut 33 rides on each of the arch rails 3l,
III may be in the form of a table or desk having 50
the
half-nut 3_3 beine, here shown secured between
a working top I2, front legs I3 and I4 and rear
the sides of an inverted channel bar 34. The
legs I5. The table may be reinforced along its.
threads
in the half-nut mesh with the screw
top ends by panels I6 and along its lower ends by
threads 32 on the arch rails, the bracket ‘25 also
cross-pieces I'I, the latter being connected by a
straddling the channel bar 34.
longitudinal runner I8, thus providing a suitable 55
Each of the channel bars 34 is secured to a
2,404,949
3
ñnger 35 which is keyed to a rock shaft 39 jour
nalled at each end in the cleats 29, the ends oi
the rock shaft 35 which pass through the cleats
and through the iingers 35 being conveniently
reduced, as best shown in Fig. fl, to prevent longi
tudinal movement of the rock shaft. Between
each of the inverted channel bars 34 and the
flanges 26 of the brackets 25 is inserted a com
pression coil spring 31. which normally biases the
channel bars 34 into position to cause the grip
ping members 33 to frictionally engage the arch
rails 3I, and, in this instance, to intermesh the
threads 33a on the half-nut 33 with the threads
32. One of the inverted channel members 34,
in this instance the one at the left-hand end of
the drawing board is conveniently extended out
wardly as at 38 to form a hand lever by which
the common rock shaft 3S may be partially ro
4
trained, and thence the cable 46 travels from the
pulley 41 with the cable 45, to the coil spring 49
where it is also connected, as at 59, to the coil
spring. The spindle 53 has its bearing in the
casing walls advantageously reinforced by ex
tensions 55h of the uprights 55.
Tension on the spring 49 may be varied by
means of a crank 55 on the exterior of the casing
which is keyed to the spindle 53, as at 51, and
has a handle 58. By rotating the crank 5B in
a clockwise direction, looking at Fig. 2, the ten
sion of the spring 49 may be increased and by
turning the crank counter-clockwise, the tension
may be decreased. The face of the casing may
have radially arranged holes 59 therein into which
a nib Bil at the inner end of the handle 58 may
be sprung to hold the crank in selected adjusted
positions against the pull of the spring 49. The
handle 58 may be constructed as shown in Fig. 9
tated against the action of the springs 31 to re
lease the gripping members 33 from the arch 20 in which the nib 50 is shown integral with a
spring plunger 69a threadedly connected as at
rails 3l and thus permit angular adjustment oi
59h with the exterior shell 69o of the handle,
the drawing board, as suggested in Fig. l.
A coil spring 99d surrounds the plunger 60a and
The end of the lever 38 may terminate in a
presses at one end against the flange 99e of the
wooden handle 39 for convenience in grasping
this lever and moving it toward the board to 25 plunger 69a and at its other end `against the
crimped endlßßf of a spring barrel 99g. By pull
effect the release just described. Upon letting go
ing outwardly on the exterior shell 90C of the
of the lever 38, the springs 31 again urge the
handle, the nib is retracted, the spring being fur
gripping members 33 into engagement with the
ther compressed, so as to be again urged toward
arch rails 3l to retain the board in its selected
angular position until its position is again de 30 the face of the casing upon release of the handle.
Thus the entire weight of the posts I9 and 2D
sired to be changed. Stop members 49 carried
and with them the drawing board II and its
at the top of the posts I9 and 20 limit backward
langular adjustment mechanism may be counter
rotative movement of the pivot brackets 25 on
balanced by the spring 49. In practice, almost
the posts to inhibit rotation of the drawing board
the entire weight is counterbalanced so that ver
in this direction beyond the horizontal position
tical adjustment of the drawing board may be
as shown in broken lines in Fig. l, and other stops
effected by relatively slight manual effort on the
4I at the lower ends of the arch rails 3| may
part of the draftsman, to raise or lower the draw~
limit the rotation of the drawing board in the
ing board as desired. A brake mechanism, as
opposite direction, by also contacting with the
40 next described, is provided to maintain the board
pivot brackets 25.
in such selected vertical adjustment.
Turning now to the means for eiîecting the
Following the present invention, the brake
vertical adjustment of the drawing board, and
mechanism just referred to comprises, as here
further in accordance with the present invention,
shown, a pair of jaws 6I and G2 which, by their
the casing 22 receives the posts I9 and 2U there
somewhat wedge-shape mouths IDI), partially
through by means of apertures 42 and 43 in the
receiving the posts i9 and 20 respectively, are
upper and lower walls respectively of the casing,
arranged to jam. the posts between themselves
these apertures affording a sliding fit for the
and the opposite margins of the casing apertures
posts therein. Aflixed to each of the free ends
42 and 43 and thus to frictionally clamp the posts
2| of the posts, as at 44, are flexible members such
as, in this instance, the cable 45 for the post I9 50 against vertical movement therein. The jaws 6I
and 52 are shown carried integrally at the upper
and the cable 46 for the post 2U. These cables
ends of bifurcated arms 93 and 54 respectively.
run upwardly parallel with the posts and into the
The arm 93 is conveniently pivoted on the pivot
casing 22 where they are supported as next de
55 of the idler pulley 41 and the arm 64 is piv
scribed. It will be noted that the openings 43
oted similarly on the pivot 65 of the idler pulley
in the lower wall of the casing are enlarged suf~
54. Loosely connected to the jaw El, as by a
ñciently to pass the cables therethrough with the
somewhat ball and socket connection, is a short
posts, the cables being here shown upon the out
cylindrical hollow bar` 51, a nib Gla on the jaw
side of the posts in contact therewith.
projecting into the interior of the bar, and con
The cable 45 for the post I9 in this instance
nected to the jaw 62 is a similar hollow bar 68
passes over an idler pulley 41 journalled within
which has a relatively long extensible section 59.
A nib 62a on the jaw 62 projects loosely into
the interior of the bar 68. These bars may be
conveniently in the form of pipes or tubing. The
bar sections 53 and 69 are left and right-hand
59. The other end of this expansion coil spring
threaded as at 98a and 69a respectively lwhere
is hooked as at 5I to a cord 52, the other end of
they are connected by a threaded coupling 13 by
which is wound on a spindle 53 journalled within
which the combined length of the bar sections 68
the casing 22 adjacent its end opposite the post
and 59 may be shortened or lengthened.
I9. The cable 48 for the post 29 passes upwardly
Adjacent the left-hand end of the casing 22,
into the casing 22 similarly to the cable 45 and 70
in this instance, the uprights 48 are extended as
over an idler pulley 54 journalled within the cas
at 1I to provide a bearing as at 12 for a pintle
ing on uprights 55 riveted as at 55a to the inner
13 extending across the casing. Upon the pintle
faces of the casing. The cable 45 thence travels
'I3 is pivoted centrally a pair of parallel brake
longitudinally of the casing 22 to pass over the
links 14 and 14a. The links 14 and 14a are ex
same pulley 41 upon which the cable 45 is en
the casing on a pair of uprights -48 riveted as at
48a to the inner faces of the casing, and thence
to one end of a relatively heavy expansion coil
spring 49, to which the cable 45 is hooked as at
f5
.2,404,949
6
tended .in :opposite .i-.directions :from their »pivot
11.3. Theotherwisefree ends .of the bars .61 :and
spring, ,the spring 4.9 being thus what .is com«
.69 are pivotedlas 'at .l5 .and :1_6 respectively .to `the
adjacent .ends .of »the .brake rlinks 1A -and l14d.
The >link 'I4 iis ,further „extended -in `both Idirec.
tions of ythe »pivot v'13, in one 4direction .as at 'H
lto `»have hooked thereto as at -18 va wire »lâ y.which
It is `to .be .understood that the invention isnot
intended .to .be limited to .details -of „construction
here .shown `for `illustrative purposes. 'Other
.modiñcations will ysuggest vthemselves to :those
skilled inthe art and having y,the ,benefit of ,the
vpresentdisclosure. Furthermore, it is notintend
`ed Íthat it be .understood that .allffeatures `of .the
_present disclosure must .be used .conjointly, :since
'it will lbe apparent to workers in »the .art .that
various combinations .or l.sub-combinations may
has its other end hooked as at 80 to an expan
:sion -coilrspringanchored as vat 82 to a .clip 83,
monlylknownas ñoating.
Weldedfas `at `84 fto -the lower wall .of the casing,
The 1extremity of fthe extension 'L1 of .theilink M
may be »offset »outwardlyfas at i85 to :be fclear `of
:the bar »69. The .otheren’d `86-of the .link ‘L4 _has
>at .times he »advantageously employed.
articulated therewith as v:at ,8.7! a ~wire rod »8B
which .extends :downwardly `throueha slot .89 in _
`claimed is.:
,the'lower «wall of:»the».oafsing»to .be articulated as
¿at .90 mithra .-foot lever or ¿pedal 9| gplvoted as at
ï92 `on "an ¿inverted Ueshape bracket 93 suitably
’
‘The invention having ‘been described, .what ¿is
’
l. In _a drafting ¿standjincluding ,a pair .of ver
;tically movable pests, the combination including,
a Acasing having spaced apertures, said posts pass
fsecured .tothe Aunder face of the .desk ,runner v|23.
A.ing .through `the apertures andslidable with re
Since »in the .normal gposition '.-o’f vthe bars (Sl .20 spect vto ,the casing, a ,pair of >>brake members
and«69,.a line connecting .the >-pivots T5 -and 'f6 «of
.the bars .61 »and >69 yon .the .links V'M_-'lila ris îsub
zstantially .aligned with atheaxesfof .these bars, .the
.bars vare .at substantially their «maximum dista-nce
apart andthe «jaws 6l .and >.62 are `pressed ‘out
wardly toclamp »the posts @I9 yand .20 -respectively
.against vertical movement. When, now, the
.pedal :9|
depressed, the rod »88 Ais reciprocated
'hinged in .the .casing and ,adapted ,to ïrìctionally
.engage the .posts .to clamp :them .against _move
ment, a pair .of .aligned movable .bars supported
within `the casing .by Asaid 'brakemembers .respec
, .-tively, a link intermediallypivoted in _the casing
Iand _articulated ait Aeach end with lsaid 'bars `re
spectively, a spring anchored in said casing,
means connecting ,the spring and link, said spring
rdownlwardlyand the »brake links .T4-14a Iare .fro
means urging ,thelink in .a direction `to press the
«tated counter-clockwise‘on‘their pivot ‘lf2 against
:the force .of .the fexpansion spring ill. Rotation
Abars .apart whereby to urge _the ybrake Vmembers
yof _the fbrake links .draws :the ends of the .bars
51 .and ‘69 ätoward‘each other or at least toward
Sinto frictional engagement with said ,postsand a
manually `operable lever secured ¿tosaidllink .in
said casing and adapted `to rotate theïlinkin ,the
.opposite direction ,against the force of said spring
.a .-verticalline passingsthrough‘the pivot l2, thus
`reduoingthe overallflength of the -barsrBiL-Bê-ES .35 tofreleaselthebrakemembers.
,anjdrelaxing the pressure Íof Íthe jaws 6I and `62
’2. In 'a ydrafting-.stand of the .type .comprising
on the posts I9 and 20 respectively. This move
a'base .and apaîr'of vertically reciprocable spaced
ment ‘need be -only very slight and the --articu
.apart `upright .members .adjustably .supporting a
lated connections provided by the -nibs 64a .and
.drawing board on .the base, the combination ,in
'62a I(somewhat .in the »nature -of universal joints) 40 cluding, .a ycasing .having `spaced apertures ,in
.with :the bars .accommodate -this »movement ol’
which .said .upright members .are yslidably .ar
:the îbrakelinks. 'Thereimay .beat the l>same time
ranged, a vpair .of .brake vmembers hinged .in the
.a ¿slight ¿inward movement toward -each :other
,casing «andadaptedto frictionally engage the .up«
of :the _arms 93 and >64 on theirpivotsûä :and -6ß
.right members yand îpress ,them «against the :sides
Yduring 'the icontractual <movement :of the bars
of -the .casing rapertures „to v1clamp them against
dust .-described. lThus, l¿the ~¿posts :I'S "and 2i! .are
movement, a pair .of .aligned Amovable vbars _en
released for 'vertical Imovement :andare Arendered
gaging »said `brake .members respectively, a :link
subjcctito .theipullïof ‘thespring ‘4.9, and counter
intermedially pivoted -in -the .casing _and «articu
-balanced thereby, so that :the :drawing `'board
lated at each end with said bars respectively,
may be either depressed or elevated by alight 50 spring lmeans `connected to 'the link, :said spring
pressure iolD ith‘e hand. Thereupon the pedal s!
-means urging thelink in `.a rotative direction to
may :be .released aand the "drawing board .again
«urge the `bars
whereby ,to -urge the brake
secured at its desired elevation. The extension
members into-clamping engagement with-’said .up
1| carries a brake stop lug 'Ha Iwhich limits
right members, and a manually operable lever
clockwise rotation of the links 'i4--14a under the 55 secured to said link in said casing and adapted
influence of the expansion spring 8l to a point
to rotate the link in the opposite direction against
where a line connecting the pivots ‘I5 and 'I6 is
the force of said spring to release the brake mem
substantially coincident with the axis of thebars
bers.
(il-«69. The stop lug 'Ha acts by engagement
3. In a drafting stand of the type including a
With the extension 86 of the link 14.
60 base and a pair of upright spaced apart members
Intermediate the casing 22, the bar 69 may
vertically reciprocable relative to the base, the
carry a pair of wooden hangers 94 and 95 some
combination including, a casing having spaced
what loosely thereon. The hanger 94 at its lower
apertures in which said members are slidably ar
end has a pair of vertically spaced apart screws
ranged, friction brake means in and cooperating
96 between which and between the open sides
with said casing to hold the members in vertically
of the hanger pass the cables 45 and 46, thus
adjusted positions relative to said casing, said
providing a guide for these cables. Similarly,
brake means including a pair of movable friction
the hanger 95 has a pair of vertically spaced
pieces located between the members and engage
apart screws 91 between which and between the
able with the members, and means for ,simul
open sides of this hanger slidingly passes the 70 taneously and selectively drawing the friction
cord 52 to guide this cord in its movement. The
pieces together to effect disengagement thereof
hangers 94 and 95 also assist in maintaining the
from the members and moving them apart to
spring 49 in transverse position in the casing but
eifect engagement thereof with the members.
are adapted to slide on the bar 69 to accommo
4. The structure of claim 2 wherein the com
date longitudinal expansion or contraction of the 75 bined length of the bars is adjustable.
2,404,949
7
8
members, said spring and the toggle means for
the brake members, said apertures having sides
cooperating with said brake members when ,the
5. The structure of claim 2 wherein the brake
members are loosely connected to the bars re
spectively by a ball and socket connection.
latter are moved away from each other into fric
6. In a drafting stand of the type including a
tional engagement with said board supporting
base, a pair of upright spaced apart members ver
'tically reciprocable on the base, and a drawing
members for holding the board supporting mem
bers and the drawing board in vertically adjusted
board supported by said members, the. combina
position.
tion including, a casing mounted on the base and
9. In a drafting stand, a base, a casing mounted
on said base and having horizontally spaced aper
"having a pair of spaced apart apertures movably
receiving the upright members, and friction brake
tures therein, a pair of board supporting mem
mechanism located within said casing for hold
bers slidably arranged in spaced upright posi
-ing said upright members in adjusted vertical
tions for vertically reciprocable movement in said
positions, said brake mechanism including a pair
apertures, a drawing board mounted on said
of movable friction pieces pivotally mounted in
said casing, between the members and engageable 15 board supporting members at the vupper ends
thereof, means connected to said board support
with the members, and mechanism including
ing members and said casing for urging said
means operable from the exterior of the casing
board supporting members and said drawing
for selectivelydrawing the friction pieces to
board upwardly, a pair of brake members each
gether to effect disengagement thereof from the
upright members and moving them apart to effect 20 movably mounted in said casing adjacent one of
said board supporting members for movement
engagement thereof with the members.
from and to engagement therewith, said brake
` 7. In a drafting stand, a base structure, a pair
members being frictionally engageable with said
of board supporting members slidably supported
board supporting members when the brake mem
in horizontally spaced` relationship for vertically
reciprocable movement on and relative to said 25 bers are spread apa-rt and disengageable there
from when moved toward each other, toggle
base' structure, a drawing board mounted on said
means including a spring supported in said casing
board supporting members at the upper ends
between
said brake members and resiliently urg
thereof, means including a spring connected to
ing them apart into frictional engagement with
said base structure and both of said board sup
the respective board supporting members for
porting members for urging said board supporting
holding said board supporting members and
members and said drawing board upwardly, a'pair
drawing board in vertically adjusted positions
of brake members each movably secured to said
relative to said casing, and manually operable
base structure adjacent one of said board sup
means for operating the last said means to move
porting members for movement toward each other
said brake members toward each other out of
and away from the respective board supporting
holding engagement with said board supporting
members and for movement away from each
members.
y
other toward the respective board supporting
l0. A friction brake mechanism for holding in
members, said 'brake members being frictionally
selected vertical adjustment a pair of spaced
engageable with said board supporting members
apart members supporting a drafting board for
when moved away from each other and disen 40
vertical movement on a base, said brake mech
gageable from said board supporting members
anism including a pair of movable friction pieces
when'moved toward each other, and toggle means
pivotally mounted on the base and engageable
mounted on the base structure and intercon
with the members when said friction pieces are
necting said brake members for moving the latter
moved apart and disengageable therefrom when
toward each other to disengage the same from
drawn together, and means including a single
said board supporting members and for moving
cable connection and a single cam actuated
said brake members away from each other into
through said connection for simultaneously draw
frictional engagement with said board supporting
ing the friction pieces together or moving them
members.
Y
8. I_n a drafting stand as set forth in claim ‘7 50
a casing carried by said base structure, having
spaced apertures in which said board supporting
members are slidably arranged and housing said
apart.
`
.
-
'
WILLIAM H. MURPHY.
Executor of the Estate of Harold L. DeLisZe, De
ceased.
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