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Патент USA US3065554

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NOV- 27, 1962
'
R. M. O'MALLEY
~ 3,065,544
ELLIPSE-FORMING COMPASS
Filed June 12, 1961
W.w mR
£05527 M U/WALLE)’
“15, $012M
ATTORNEY ‘
3,065,544
Patented Nov. 27, 1962
2
3,065,544
ELLWSEFORMTNG CGMPASS
Robert M. O’Malley, 3&8 W. Hawthorne St,
Giendale 4, Calif.
Fiied June 12, 1961, Ser. No. 116,569
11 Claims. {C1, 33—27)
This invention relates to a compass for forming and
drawing ellipses.
its intermediate portion 21 where a screw seat 22 is pro
vided, the same is generally conventional of the bow
springs used in spring bow compasses.
-
The spinner 11 is also typical in that the same extends
radially from the tapped seat 22 and comprises a means
by which the compass may be manipulated to describe
an ellipse much like a conventional compass is manipu
lated to describe a circle. In this case, said spinner is
provided with an axial bore 23 open to the interior of
An object of the present invention is to provide an 10 the spring 10.
instrument of the character described that is manipulated
The scribing compass leg 12 comprises a bar 24 hav
in the ordinary way that circle~forming compasses are
ing a pivot 25 with a folding bar 26 extending from said
manipulated, thereby greatly facilitating the forming of
pivot, and a scribing extension 27 on bar 26. The
latter, in the usual way, may be separably connected at
Another object of the invention is to provide an ellipse 15 28 to the bar 26 and be provided either with a pencil
forming compass that is adjustable to form ellipses vary
point 29, as shown, or a pen point. It will be noted that
ing in the proportion of long to short axis, thereby en
the pivot 25 is so located as to provide leg 12 with a
ellipses.
abling forming a wide range of differently proportioned
ellipses.
wide range of folding adjustability to bring the scribing
point 29 nearer or further from the compass point 15,
A further object of the invention is to provide an ellipse
according to the size of the ellipse desired to be scribed.
forming compass that is complete in itself, i.e., the same
The above-described leg ‘12 is provided with an arm
does not require nor depend for its operation upon inter
3i) that comprises an integral extension of the bar 24,
changeable elements, such as templates, but rather re
said arm being directed at an angle to said bar so as to
quires a simple setting adjustment to enable its use to
provide the leg 12 with a fulcrum area 31 in which, as
describe ellipses of predetermined size and long and short 25 shown in FIG. 6, are provided spherical seats 32 for leg
axis ratio.
fulcrumming balls 33. The arm 30 is preferably ?at in
This invention also has for its objects to provide such
the manner shown. On the side opposite to the ful
means that are positive in operation, convenient in use,
crum area 31 and in the lower portion of the arm 30 is
easily installed in a working position and easily discon
provided a seat 34 into which an end 20 of the bow spring
nected therefrom, economical of manufacture, relatively 30 10 is ?tted.
simple, and of general superiority and serviceability.
The companion compass leg 13 comprises a tubular
The invention also comprises novel details of construc
bar 35 that has an arm 3th a fulcrum area 31, spherical
tion and novel combinations and arrangements of parts,
seats 32, and a seat 34, as above described in connec
which will more fully appear in the course of the follow
tion with the scribing leg 12.
ing description, and which is based on the accompany
As shown, the bow spring 10 biases the legs 12 and 13
ing drawing. However, said drawing merely shows, and
with the bias applied to the lower portions of the arms 30,
the following description merely describes, one embodi
thereby causing the opposite ends of said legs to spread
ment of the present invention, which is given by way
apart. The bore 36 in the leg 13 is a through cylindrical
of illustration or example only.
bore which, at its upper end, opens through the inner
40
In the drawing, like reference characters designate simi
face of the arm 30 of said leg 13.
lar parts in the several views.
FIG. 1 is a front elevational view, partly in section,
of an ellipse-forming compass according to the present in
vention.
FIG. 2 is a broken front view showing the upper por
tion of one side of said compass.
FIG. 3 is an enlarged and broken sectional view of the
compass parts as in the upper portion of FIG. 1.
FIG. 4 is a similar view of the portion shown in ‘FIG. 3
in another position.
The torsion bar 14 comprises an elongated intermediate
portion 37 that is cylindrical and, therefore, has rotational
engagement in the cylindrical bore 36 of the leg bar 35.
Where the portion 37 extends from the lower end of bar
35, a reduced and, therefore, ?exible neck 38 is provided,
the samerserving as a ?exible, yet torsion-resisting, means
that connects the bar portion 14 and the compass point
member 15.
’
The torsion bar 14 includes an upper extension 39 of
polygonal cross-section—here shown square——a threaded
FIG. 5 is a perspective view of an ellipse-forming tem
plate used in the present invention.
FIG. 6 is a broken elevational view showing a portion
of one of the compass arms as seen from the side there
of directed toward the other compass arm.
The instrument for forming ellipses that is illustrated
in the drawing comprises, generally, a bow spring 14}, a
spinner 11 af?xed to said spring, a scribing compass leg
12 and a companion leg 13 connected by the spring 10,
a torsion bar 14 extending axially through the leg 13,
a compass point member 15 at the end of the bar 14
that extends from the lower end of the leg 13, an ellipse
extension '41) on the end of extension 39, and a preferably
reduced round extension 41 on the end of the threaded
extension 46.}. Extension 41 rotationally resides in the
bore 23 of the spinner 11. A reduced, torsion-resisting
and ?exible neck 42 connects the bar portion 37 with
the square extension 39, the neck being located where the
bore 36 ends in the arm 30. Thus, the bar 14 is able
to ?ex at an obtuse angle that is formed between the
portion 37 in the leg 13 and the portion comprising the
extensions 39, 4t? and 41.
The compass point member 15 comprises a body part
.forming template 16 slidably, non-rotationally carried
43 that forms an extension of the bar 14 ‘from the ?ex
ible neck 38, and at least two spaced pins 44 that extend
by the upper end of the bar 14», and an adjusting nut 17
on said bar 14 and operatively engaged with the template
.16 to adjust the position thereof according to the axis
ratio of the ellipse desired to be described by the com
piece a surface so as to hold said member 15 non-rota
tionally connected to such surface. Three or more pins
pass.
-
I
The bow spring 10 is of open circular form with the
usual bias-applying ends 20. Except that the present
spring is narrower at and adjacent the ends 2i) than at
integrally downward from said body and are’ adapted to
44 may be provided, if desired, the intent being to hold
the member 15 in ?xed position during manipulation of
the compass to describe an ellipse.
The template 16 comprises a member having a sub
stantially circular end 45 and an opposite oval end 46,
soonest
3
the member, between said ends, having a transitional form
between round and oval. It will be clear that, from the
template end 45 to the end 46, the successive cross~sec~
tional planes will be ellipses that having decreasing short
diameters with long diameters of constant size. A poly,,
onal bore 47 in said template ‘conforms to the sectional
shape of extension 39. Hence, said template 16 is slid
ingly but non-rotationally carried by said extension.
The adjusting nut 17 has threaded engagement with the
extension 4%; of the torsion bar 14 and is in ?atwise en
gagement with the end 45 of the template, since the bow
spring 10‘ biases the arms 34% toward each. other and into
opposite engagement with the template, thereby pressing
said template toward and into engagement with said nut
17.
It will be clear that the adjustment of said nut con~
trols the spread of legs 12‘ and 13 due to the controlled
spread of the arms 3%‘ of said legs.
A comparison of FIGS. 3 and 4 reveals that the spread
of the legs 12 and 13 is greatest when the arms 3% are in
contact with narrower. portions of the template, as in
FIG. 3 , and least when said arms are in contact with the
widest part of the end so of the template, as in FIG. 4.
Therefore, when the pins 44 are set on the intersection of
the two axes on which an ellipse is to be scribed, with
the arms 30‘ in contact with the narrow part of the tem
plate, and the Spinner ii. is manipulated to cause the
entire instrument to turn around themember 15, except
that the torsion bar 14» will ?ex at necks 38 and 42, neither
said bar nor the template will turn, thereby causing said
arms 30 to traverse the surface of the template. It will
‘be clear that a 90° turn of the instrument will cause a
traversal of said arms from the position of FIG. 3 to that
of FIG. 4 and a gradual contraction of the legs from their
spread condition to a narrower spread. Thus, the point
29 will scribe one-quarter of an ellipse from one end of
the long diameter thereof to one end of the short diame
ter. Then, as the instrument is turned through the next
4
leg, a pivot intermediate the ends of said leg whereby the
latter is foldable on said pivot, a tubular companion leg,
said legs being joined at a fulcrum, each leg being pro
vided with an arm and said arms being oppositely angu
larly directed, a template disposed between and engaged
with said arms, spring means ‘biasing said arms toward
engagement with the template and spreading the compass
legs accordingly, a rotational bar extending through the
, tubular leg, at non-rotational compass point ?exibly and
non-rotationally connected to and extending from one
end of said bar, and a polygonally-sectioned extension
?exibly connected to the opposite end of the bar, said
template having a hole of the same shape as said exten
sion to non-rotationally connect the template and bar
extension.
3. An ellipse-forming compass comprising a scribing
leg, a tubular companion leg, said legs being joined at a
fulcrum, each leg being provided With an arm and said
arms being oppositely angularly directed, a template dis
posed between and engaged with said arms, said ‘template
having a generally round end and an oval end with the
portion between said ends gradually varying in shape
between round and oval accordingly, spring means biasing
said arms toward engagement with the template and
: spreading the compass legs accordingly, a rotational bar
extending through the tubular leg, at non-rotational corn
pass point ?exibly and non-rotationally connected to and
extending from one end of said bar, and a polygonally
sectioned extension ?exibly connected to the opposite end
of the bar, said template having a hole of the same shape
as said extension to non-rotationally connect the template
and bar extension.
4. An ellipse-forming compass comprising a scribing
leg, a tubular companion leg, said legs being joined at a
fulcrum, each leg being provided with an arm and said
arms being oppositely angularly directed, a template dis
posed between and engaged with said arms, spring means
biasing said arms toward engagement with the template
270°, the point 29' will successively scribe the remaining
and spreading the compass legs accordingly, a rotational
three-quarters of the ellipse.
bar
extending through the tubular leg, a non-rotational
40
It will be seen that the tubular leg 35 revolves around
compass point ?exibly and non-rotationally connected to
the portion 37 of the bar 14 and that a small amount of
and extending from one end of said bar, said compass
?exure occurs at the necks 38 and 4-2 as the instrument
point comprising a part provided with at least two pins
is turned through a full 360°. It will be evident that the
to penetrate a surface on which the compass is to scribe
instrument may be turned in either direction and that the
an ellipse, and a polygonally-sectioned extension ?exibly
scribing operation may be begun at the short or the long
connected
to the opposite end of the bar, said template
axis, as desired.
having a hole of the same shape as said extension to n0n~
The pivot in leg 12 enables making different sizes of
rotationally connect the template and bar extension.
ellipses with the same adjustment or setting of the tem
5. An ellipse-forming compass according to claim 1
plate, all of these ellipses having the same axis ratio, as
in
which means is provided to adjust the position of the
50
above indicated.
template relative to the fulcrum between the legs to,
While the foregoing has illustrated and described what
thereby, regulate the spread of the legs.
is now contemplated to be the best mode of carrying out
6. In a compass having a pair of compass legs con~
the invention, the construction is, of course, subject to
nected at a fulcrum and spring-biased in a leg-spreading
modi?cation without departing from the spirit and scope
direction, the improvements that comprise a through bore
of the invention. Therefore, it is not desired to restrict
in one leg, an elongated bar rotationally disposed in said
the invention to the particular form of construction illus—
bore, a compass point ?exibly connected to one end of
trated and described, but to cover all modi?cations that
said bar and extending beyond one end thereof, said
may fall within the scope of the appended claims.
compass point being provided with at least two penetra
Having thus described the invention, what is claimed
60 tion pins to hold the same non-rotational on and relative
and desired to be secured by Letters Patent is:
to a surface, an arm extension on each leg, said exten
1. An ellipse-forming compass comprising a scribing
sions being oppositely inclined with respect to each other
leg, a tubular companion leg, said legs being joined at a
and inclined relative to the leg on which provided, and
fulcrum, each leg being provided with an arm and said
a template non-rotationally connected to the other end
arms being oppositely angularly directed, a template dis
of said bar and disposed between the arm extensions on
posed between and engaged with said arms, spring means
the compass legs, said template being formed to vary the
biasing said arms toward engagement with the template
angle between the mentioned arm extensions and, there
and spreading the compass legs accordingly, a rotational
fore, the spread of the compass legs, during rotation of
bar extending through the tubular leg, at non-rotational
the-compass around said compass point so that the end of
compass point ?exibly and non-rotationally connected to
and extending from one end of said bar, and a polygo 70 the other leg may scribe a ?gure on the mentioned sur
face according to the variations of spread of the compass
nally-sectioned extension ?exibly connected to the oppo
legs.
site end of the bar, said template having a hole of the
7. In a compass according to claim 6, a ?exible, torsion
same shape as said extension to non-rotationally connect
resistant neck being provided at the connections between
the template and bar extension.
2. An ellipse-forming compass comprising a scribing 75 the bar and the compass point.
3,965,544.
5
6
8. In a compass according to claim 6, a polygonally
sectioned extension on the bar and slidably mounting the
a template non-rotationally connected to the other end
mentioned template.
9. In a compass according to claim 6, a polygonally
sectioned extension on the bar and slidably mounting the
the compass legs, said template being formed to vary the
angle between the mentioned arm extensions and, there
fore, the spread of the compass legs, during rotation of
mentioned template, a ?exible, torsion-resistant neck con
the compass around said compass point so that the end of
of said bar and disposed between the arm extensions on
necting said extension and the bar.
the other leg may scribe a ?gure on the mentioned sur
10. In a compass having a pair of compass legs con
face according to the variations of spread of the compass
nected at a fulcrum and spring-biased in a leg-spreading
legs, and means to regulate the position of the template
direction, the improvements that comprise a through bore 10 relative to the fulcrum between the compass legs to vary
in one leg, an elongated bar rotationally disposed in said
the ratio of spreading movement of the compass legs, as
bore, a compass point ?exibly connected to one end of
desired.
said bar and extending beyond one end thereof, said
11. In a compass according to claim 10,- a sliding mount
compass point being provided With at least two penetra
for the template, said means to regulate the template mov
tion pins to hold the same non-rotational on and relative 15 ing the same along said mount.
to a surface, an arm extension on each leg, said exten
No references cited.
sions being oppositely inclined with respect to each other
and inclined relative to the leg on which provided, and
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