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Патент USA US3084451

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April 9, 1963
3,084,441
K. A. BOWEN
INSTRUMENT FOR INSCRIBING AN ELLIPSE
Filed April 14, 1961
2 Sheets-Sheet 1
FIG. 2
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INVEN TOR.
KE RMI T A. BOWEN
BYW W
V
x
A TTORNE Y5
April 9, 1963
K. A. BOWEN
3,084,441
INSTRUMENT FOR INSCRIBING AN ELLIP‘SE
Filed April 14, 1961
2 Sheets-Sheet 2
I08; ( I04 ( 10s 30!
903
INVENTOR.
KERM/T A. BOWEN
.02 2l02
<y.
BYM
ATTORNEYS
v
B?dliAiil
lJni-ted grates Patent
Faterited Apr. 9, 1963
1
I
3,084,441
INSTRUMENT FOR INSCRIBING AN ELLIPSE
Kermit A. l?owen, PO. Box 755, La Mesa, Calif.
Filed Apr. 14, 1961, Ser. No. 103,939
10 Claims. (Cl. 33--30)
The present invention relates to ellipsographs of the
type which is provided for inscribing, selectively, ellipses
2
hardened ball bearings 38 and 40'. These balls extend
partly within aligned sockets 42 in each of the sections
32 and 34 of the legs. These sockets are formed by drill
ing through circular sections and providing hardened
bearings 44, each having a hollow surface ground to the
shape of the segment of a hollow sphere, confronting,
receiving and complementing the ball bearings. These
bearings 44 are held in adjusted position, with respect to
of different major and minor axes.
the ball bearings by set screws 46. This bearing means
The ellipsograph of the present invention includes a 10 carries a T-shaped frame 50 having cross arms 52 and 54
main frame having upright legs which are connected with
and a depending leg 56. Each of the extreme ends of
one another by a yoke. The foot ends of these legs rest
the cross arms is provided with a socket 58 having a
on the surface to be inscribed and preferably are in the
hollow surface ground to the shape of the segment of a
form of pins for piercing, for example, the paper surface
hollow sphere, and confronts, receives and complements
on which the ellipse is to be drawn; this yoke is provided 15 the ball bearing.
with a longitudinally extending guideway and is arranged
The depending leg 56 of the frame 59 is drilled longi
parallelly of the surface on which the ellipse is to be
inscribed.
A second frame is mounted on the main frame for
oscillatory movement relative to the main frame on an
tudinally as at 60 on an axis disposed
the aligned axis of the ball bearings.
62 is journalled in the drilled hole 60
thus the leg 56 provides a bearing for
axis lying below and parallelly of the guideway of the
tending shaft 62.
yoke.
An upright or vertically extending shaft is journalled
at right angles to
A rotatable shaft
of the frame 50;
the vertically ex
The upper end of the shaft 62 carries a horizontally
extending arm 64 which causes, in cooperation with a
in the second mentioned frame and is disposed between
guideway 66 in yoke 36, oscillatory movement to be
the legs of the main frame. A horizontally extending 25 imparted to the frame 50 and shaft 62 when rotatable
arm is rotatable with the shaft and disposed between the
movement is imparted to the shaft. This oscillatory
second mentioned frame and the guideway of the yoke.
This arm is provided ‘with an element which cooperates
movement is about the horizontal axis of the aligned
ball bearings 38 and 40.
with and is guided along the guideway. A second hori
The degree of such oscillatory movement is adjustable
zontally extending arm is rotatable with the shaft and 30 and may be selectively set. To accomplish this, the arm
is disposed below the second mentioned frame. A lever
64 includes a horizontally eXtcnding guideway in the form
is pivotally attached to the free end of the lower arm and
of a slot 68 forming a track for guiding a carriage 70.
is movable vertically. An inscriber is carried by this
This carriage includes a side portion 72 which is slidable
lever.
along one side of the arm 64 and an upper portion 74
The upper arm is provided with a guideway which is 35 which rides on the top of the arm. The side portion 72
arranged parallelly with the guideway of the yoke. The
is drilled and threaded for receiving a screw 76, the shank
element, which is guided by the yoke guideway, is guided
of which extends through the slot and the head causes
by and selectively, adjustably ?xed with respect to the
the arm to be clamped between the head and the side
arm guideway for selecting the lengths of the major axes
portion 72. The top of the carriage 70 is provided with
40
of ellipses. The lever on the lower arm also is provided
a hollow surface which complements and receives a ball
with a guideway which is arranged substantially parallelly
bearing 80. The carriage is formed of a hardened metal
with the guideway of the yoke. The inscriber is guided
and the ball is preferably formed of nylon. This ball
by and selectively, adjustably ?xed with respect to the
80 is guided by the horizontally extending groove in the
lever guideway for selecting the widths of the minor axes 45 yoke 36, which groove has heretofore been termed the
of the ellipses.
guideway 66. This groove 66 is arcuate in cross section
The advantages will be apparent from the following
and complements the ‘ball; the slot or guideway 68 of
description, reference being had to the accompanying
arm 64 is disposed in a horizontal plane lying parallelly
drawings wherein a preferred embodiment of the inven
with and below the plane of groove 66.
tion is illustrated.
As the shaft is turned, the ball 88 will follow the
50
In the drawings:
grooved guideway 66 in the yoke 36. This turning move
FIG. 1 is a perspective View, in elevation, of the in
ment causes the lower end ‘of the shaft 62 to swing out
strument;
wardly, in one direction, during the ?rst quarter turn of
FIG. 2 is a view, partly in section, the section being
the shaft, when starting from the position shown in FIGS.
taken along line 2-2 of FIG. 1;
55 1 and 4; then on the next quarter turn, the lower end of the
FIG. 3 is a side view of the main frame and showing
shaft will ‘be moved inwardly; continuing the turning
the rotatable shaft, the arms, the lever and the inscriber
movement, the lower end of the shaft will be swung out
displaced ninety degrees from that shown in FIG. 1;
wardly, in the opposite direction; upon completing the
FIG. 4 is a side view, partly in longitudinal section,
single three hundred and sixty degree turning of the shaft,
of the main frame and showing the rotatable shaft, the 60 the shaft will have returned to the original position. The
arms, the lever and the inscriber displaced one hundred
lengths of the outward movements in opposite directions
and eighty degrees from that shown in FIG. 3; and
is governed by the length of the lever arm, ie by the hori
FIG. 5 is a fragmentary view of the upper part of the
zontal length of the distance between the axis of shaft 62
instrument, showing parts in section.
and the point of contact of the ball in the groove 66.
The instrument 20 comprises a main frame 22 includ 65 This length of lever arm and consequently the length of
ing upright legs 24 and 26, each having a foot in the
movement of the lower end of the shaft is selective by
form of an upright pin 28 and 30, respectively. The
moving the carriage 7% various distances along the slot
upper ends of these legs terminate, respectively, in sec
68. The outward movements of the lower end of the
tions of a circle 32 and 34 which are bridged at the top
shaft 62 is progressively increased by progressively mov
by a yoke 36.
70 ing the carriage outwardly. As previously stated, it is
Bearing means, having a horizontally disposed axis, is
locked in the desired position by screw 76.
provided below the yoke and is herein shown as two
The lower end of the shaft carries an outwardly extend
8,084,4d1
£5.
ing arm 84; it extends generally in the same direction as
arm 64. The free end of arm 84 is bifurcated for receiv
ing a lever 86 which is pivotally carried by the arm through
a pivot pin 88. Lever 36 extends toward and beyond the
axis of shaft 62.; the end of the lever is provided with feet
90 and 92, foot 92 being a roller. The lever is provided
with a guideway 94 in the form of a slot 96- and a concen
tric countersunk groove $25, which latter receives a nut
1%. This guideway is substantially parallel with the sur
By virtue of the present invention, perfect planar ellipses
can be inscribed of various major and minor axes. The
device may be readily actuated by one hand of the drafts
man by merely rotating the knob 11% and simultaneously
gradually tilting the upper end of the main frame out
wardly, ?rst in one direction and then in the opposite di
rection.
While the form of embodiment herein shown and de
scribed constitutes a preferred form, it is to be understood
face 162, which is to be inscribed, and the guideways 66 10 that other forms may be adopted falling within the scope
and 63.
A carriage lltld is carried along one side of the
lever 86, and this carriage is fixedly secured in the desired
position along the length of the guideway by a thumb
of the claims that follow.
I claim:
1. An instrument for inscribing ellipses upon a surface,
screw 106 and the nut 1%. This carriage carries a ver
comprising in combination, a main frame having upright
tically extending inscriber 168 in the form of a style, pen 15 legs connected with one another by a yoke, the foot ends
or pencil.
of said legs resting on the said surface, sm‘d yoke having
In operating the instrument 2%, the pins 28 and 3%} are
a longitudinally extending guideway arranged parallelly
placed in longitudinal alignment with the major axis of the
of the said surface; bearing means on the frame having
ellipse to be inscribed and the axis of the shaft 62 is dis
an axis disposed parallelly of the guideway and disposed
posed midway of the major and minor axes of the ellipse 20 intermediate the guideway and the foot ends of said legs;
to be inscribed. At this time the frame is perfectly erect,
a second frame pivotally carried ‘by the bearing means; a
i.e. the shaft 62 is aligned intermediate the legs 24 and 26.
vertically extending shaft journalled in said second frame,
The carriage 164 is then adjusted horizontally so that upon
said shaft having an arm above the bearing means; means
one hundred and eighty degree movement of the shaft,
on the arm guided by the guideway, said shaft having an
the inscriber will contact the surface at the remotest points 25 arm at the lower end thereof, said arms being rotatable
of the minor axis of the ellipse to be inscribed. After this
with the shaft; a lever; means for pivoting the lever for
is done, then the carriage 76 is adjusted horizontally for
vertical movement on the free end of the lower arm; and
the desired length of the ellipse to be inscribed.
an inscriber carried ‘by the lever.
When the shaft 62 is being turned, the frame 22 is tilted
2. An instrument as de?ned in claim 1, including means
gradually outwardly, about the pins 28 and 39, in the 30 for biasing the lever upwardly; and means for forcing the
same outwardly directional movement of the lower arm
lever downwardly.
84 until the free end of the arm reaches its extreme outer
3. An instrument as de?ned in claim 2, in which the
position; then, as the arm is moved inwardly, the frame
means for forcing the lever downwardly includes a knob
22 is moved gradually to its vertical position. Upon
slidably vertical on the shaft; and means for connecting
continuous rotation of the shaft 62, the opposite tilting and 35 said knob with the lever.
retraction of the frame is necessary. FIG. 3 shows one
4. An instrument as de?ned in claim 3, in which the
extreme tilted position of the frame for a predetermined
means for connecting the knob with the lever comprises
selected set position of the carriage '70, and FIG. 4 shows
a resilient member.
the other extreme and opposite tilting position of the
5. An instrument as de?ned in claim 1, in which the
40
frame with the same position of the carriage 7t).
said arms on the shaft are arranged substantially parallel
The shaft 62 is conveniently turned by a knurled knob
of one another.
11%) which is slidable vertically on the shaft. This knob is
6. An instrument as de?ned in claim 1, in which the
suitably connected with the lever 86 by a rod 112 and a
?rst mentioned arm on the lever is provided with a longi
tempered resilient biasing spring in the form of a rod 114%.
tudinal guideway lying substantially parallel with and
One end of the rod 112 is ?xed to the knob lltli and the 4:5
below the guideway of the yoke, and the means on the
other end is ?xed to one end of the spring rod 114. The
upper arm, which is guided by the guideway on the yoke,
other end of rod 114.- is ?xed to that end of the lever $6
is adjustably ?xable with respect to ‘the guideway on said
which is pivoted to arm 84. The knob 11%‘ and the piv
?rst
mentioned arm.
oted end of the lever 86 are normally biased upward by
7. An instrument as de?ned in claim 1, in ‘which Ithe
a coil spring 116 which surrounds shaft 62 and which is
interposed, under compression, between the top of arm
84. and the bottom of the knob.
Under such bias condi
tion, i.e. when actual inscribing is not being done, the in
scriber is lifted off of the surface ltlZ. During the act of
inscribing, downward pressure is applied to- the knob 110
to overcome the resistance of spring 116, forcing the piv
oted end ‘of the lever downward whereby the point of the
lever is provided with a longitudinal guideway lying sub
stantially parallel with the guideway of the yoke, said in
scriber being adiustably ?xable with respect ‘to the guide
way on the lever.
8. An instrument as de?ned in claim 1, in which the
?rst mentioned arm on the shaft is provided With a longi
tudinal gniideway lying substantially parallel with and
below the guideway of the yoke, and the means on the
upper arm, which is guided by the guideway on the yoke,
ellipse when the lever 86 is rotated. As previously stated,
during inscribing, the frame must be tilted ?rst one way 60 is adjustably ?xable with ‘respect to the guideway on said
?rst mentioned arm, and in which the lever is provided
and then the other about the pins 28 and 30. By pro
with ‘a longitudinal guideway lying substantially parallel
viding the resilient rod 114 between rod 112 and the‘ lever
with the guideway of the yoke, said inscriber being lad
86, the degree of accuracy of extent of tilting can be
justably ?xable with respect to the guide-way on the lever.
materially reduced.
9. An instrument as de?ned in claim 1, including means
Referring particularly to FIG. 5, it will be observed 65
between one of said frames and the ?rst mentioned arm
that arm 64 is provided with a downwardly extending
for normally yieldingly urging said ?rst mentioned arm
skirt 118 arranged concentrically of the shaft 62. The
upwardly.
skirt extends into a countersink 12% in the upper part
10. An instrument as de?ned in claim 1, including
of'frame Sit and which is also arranged concentrically of
the shaft 62. A compressing spring 122 is interposed be 70 means on the second mentioned frame and the ?rst men
tioned arm for normally yieldingly urging said ?rst men
tween the bottom of the countersink and the underside of
tioned arm upwardly.
arm 64. This spring'normally biases the arm 64 and the
inscriber ltlS rides on the surface 192 and inscribes the
shaft, af?xed thereto, upwardly so as to yieldingly retain
the ball 80 in the groove 66.
No references cited.
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