US3085341A

US3085341A - Ellipse guide

Info

Publication number: US3085341A
Application number: US121055A
Authority: US
Inventors: Frederick N Lundebjerg
Original assignee: Individual
Current assignee: Individual
Priority date: 1961-06-30
Filing date: 1961-06-30
Publication date: 1963-04-16
Anticipated expiration: 1980-04-16

Description

April 16, 1263 F. N. LUNDEBJERG l ELLIPSE GUIDE Filed June 30, 1961 United States Patent O 3,085,341 ELLPSE GUIDE Frederick N. Lundehjerg, 4 Grassy Plain Terrace, Bethel, Coun. rues .time so, 19er, ser. No. 121,055 4 Claims. (Cl. 33--30) This invention relates to an ellipse guide to facilitate drawing of ellipses of different sizes and contigurations. I-t has for an object to provide a Idevice for drawing such ellipses which is `of very simple construction and may be easily operated, as well as easily adjusted to draw ellipses of different sizes and diiferent proportions of major and minor axes of the ellipses.

With the foregoing and other objects in view, I have devised the construction illustrated in the accompanying drawing forming a part of this specification. It is, however, understood the invention is not limited to the specific details of construction and arrangement shown, but may embody various changes and modifications within the scope of the invention.

IIn this drawing:

FIG. I1 is a side elevation of the device;

FIG. 2 is -an end elevation looking from the right of FIG. 1;

FIG. 3 is a top plan view;

FIG. 4 is -a detail longitudinal section of lthe support for the marking implement;

FIG. 5 is a partial side eleva-tion and partial section of the upper part sof the upright member and the guide disc;

FIG. 6 is a plan view of the guide disc land its support, and

FIG. 7 is a detail section of the guide disc and its support.

The device is a drafting instrument for drawing ellipses of different congurations and sizes. It comprises an upright tubular member or post 10 provided with a centering or fixed locating means 11 at lits lower end, in the form shown comprising a point arranged to pierce a piece of paper or other materialen which the ellipse is to be drawn. Above this lower end is a fixed collar or flange 12 above which is a bearing 13 for a horizontal bar 14, the bearing connecting the bar to the upright member or post so that it may be turned in a horizontal plane about this upright member.

Within the upper hollow portion of the tubular upright 1d is `an upright elongated adjustable feed screw 15, connected at its upper end to an adjusting knob 16 in the form of a finger 4grip adapted to turn on a iixed washer 17 resting on the top of the member 10. .The member 10 is provided in i-ts opposite side walls with longitudinal guide slots 18 and 19, and is embraced by an elongated opening 20 in yguide disc 21. This disc is preferably circular in shape, but could be oblong or other shapes, if desired. It is supported for adjustment by the screw by means of a center bearing ring or collar 22 threaded on the screw 15, -and supported by integral oppositely extending pivot pins 23 journalled in the disc 21 at the opposite sides of the opening 2t). This support for the disc permits the disc to be tipped to various angles to the horizontal about the pivotal support 23.

Mea-ns is provided for connecting one edge of the disc to the upright member 10. In the arrangement shown, this comprises a Wire or bar 24 pivotally connected at its opposite ends as at 25 to the washer 17 and at its lower end at 26 to the edge of the disc 21. It will be seen that by cooperation of this link and the threaded connection 22 of the disc t-o the adjusting screw 15, rotation of the screw will adjust the ring 22 up or down, and thus vary the angle which the disc 21 has with the horizontal plane.

The horizontal bar 14 is also a tubular member, and mounted for longitudinal sliding movement in this bar are supporting

blocks

27 and 28. On top of the bar is a support 2,9 which may 1be a at strip with downwardly turned ends '-30 and 31 resting on top of the bar 14, and carried by thi-s support are upright strips or pins 32 passing through the top portion of the support 29 and at their lower ends driven into the

blocks

27 and 28 so as to be supported thereby. Carried by the members 32 is an adjusting screw 33 provided with a linger grip opera-ting knob 34, this screw having bearing support at its opposite ends in the members 32.

Having threaded engagement with the screw 33 is an upright, downwardly extending bar 35 provided with a holder 36 in the form of means for gripping a lead or pen 37, or it could be a scriber. Thus this bar 35 and marking element forms a marking implement carried by thesupport 29 and ladjustable longitudinally thereon toward and from the centering upright member 10, the element 35 and the marking means forming a depending marking implement that is guided tor longitiudinal movement by passing through an elongated slot 38 in the support 29, and further longitudinal slots 39' and 40 4in the tubular bar 14. 'Ilhe member 35 may also have a guide ange or collar 35a at the under side of bar 14. The upper slot 39 also provides guide means for the elements 32. An upright guide, in Ithe present oase in the form of an upright bar 41, is connected to the support 29 at its forward end, as indicated at 42, and this is in position to engage the rim or edge of the guide disc 21 and of a length to engage this edge at 'various heights to which the disc 21 may be adjusted in the upright post or member 10, and it is held yin engagement with the edge of the disc by a coil spring 43 connected to the guide 41 and to the upright member 10 by any suitable means, such as the collar 44. The spring is thus biased to hold the guide -41 in engagement with the disc during the rotating or turning movement of the s or other material on which it is desired to draw an ellipse,

the member 10 is held in an upright position and the bar 14 carrying the marking implement 37 may be rotated about this upright, the guide 41 being held against the edge of the disc 21 during ,this turning movement by means of the spring 43. The proportion of the major and minor axes of the ellipse will be determined by the angle `at which the disc 21 is adjusted to the horizontal. lf it is horizontal or parallel .to the paper the ligure will be a circle if the disc is circular, but if inclined, as shown in FIGS. 1 and 2, the gure will be `an ellipse, and as indicated, the relative lengths of the major and minor iaxes will 'depend on the angle of inclination of 'this disc; the greater the inclination, the shorter will be the minor axis. The size of the ellipse will lbe determined by the distance between the centering means 11 and the marking means 37, which may be adjusted by the screw 33.

There may be a scale or indicator 45 on the side of the upright member 10 lover which a pointer y46 on the ring 22 or pivot may slide to indicate the adjustment of this ring and the angular position of the disc 21. Similarly, la scale 47 may be provided on the member 29 cooperating with a pointer 48 ion the depending member 35 -to indicate the .distance or adjustment of the marking member 37 from the center 11. This will determine the size iof the ellipse drawn by the marking means as the |bar 14 is rotated yabout the upright member 10.

It will be clear from the above that the `device is of very simple construction, involving a small number of parts, and that it may be easily and quickly set to produce the desired size and shape of the ellipse to be drawn. As the supporting member 10 is in a vertical 3 upright position, yand the marking implement supporting bar 14 extends later-ally fnom it in a horizontal plane, the Amarking means 37 has a uniform bearing on the surface of the paper for the complete revolution of the bar, giving a uniform line for the ent-ire ellipse.

Having thus set fo-rth the nature `of my invention, I

claim:

1. An ellipse guide comprising an upright member having vertical guide means and provided with a centering means at the lower end thereof and a bearing above said lower end, a horizontal bar mounted on said bearing to rotate about said upright member, a support. mounted on said bar for longitudinal movement thereon, a depending marking implement mounted for longitudinal adjustment on theV support, an adjusting screw on the support having threaded connection with the marking implement for shifting it on the support, a guide disc, transverse pivot means for the Adisc: mounted in said vertical guide means on the upright member, means pivotally connecting `one edge of the disc to said member, means for shifting the pivot means longitudinally of the upright member to vary the angular position of the disc on said` pivot means, a guide means on the support engaging the edge of the disc, and spring means connected to the support resiliently retaining lthe guide means in contact with the edge of the disc.

2. An ellipse guide comprising an upright tubular member provided with longitudinal guide slots in side walls thereof, a guide disc provided with an opening embracing the upright member, a transverse pivot means for the disc extending transversely of the upright member through said slots, means connecting oneV edge of the disc to the uprightl member, a screw in the upright member having threaded connection with said pivot means to shift it longitudinally of the upright member to adjust the disc to different angular positions, means for operating the screw, a horizontal bar pivoted at one end to the upright member to turn about said member, a support mounted for longitudinal movement on the bar, a depending marking implement carried by thev support, a guide on the support engaging the edge of the disc, and

spring means connected between the support and the up-v right member lto retain the guide against the edge of the disc.

3. An ellipse guide comprising an upright tubular member provided with longitudinal guide slots in side walls thereof, a guide `disc provided with an opening embracing the upright member, a transverse pivot means for the disc extending transversely of the upright member through said slots, means connecting one edge of the disc to the of Ithe bar about said member, said bar provided with longitudinal track means, a support means in said track means, an adjusting screw on the support means, a depending marking implement threaded on the adjusting screw for adjustment on the support means, a guide means on the support means engaging the edge of the disc, and spring means connected between the support means and the upright member and retaining the guide means in engagement with lthe edge of the disc during turning movements of the bar.

4. An ellipsev guide comprising an upright member provided with longitudinal guide means and -a centering means at its lower end, a guide disc provided with an "opening embracing said member, a transverse pivot means for the disc mounted in said guide means, means connecting .one edge lof the disc with the upright member, a screw mounted in the upright member and having threaded connection with said pivot means to shift it longitudinally lof the upright member to adjust [the disc to diierent angular positions, la horizont-al tubular bar, a bearing connecting `one end of the bar to the upright member for turning movements of ,the bar about said member, a longitudinally slidable element in said tubular bar means, ia support carried by said s'lidable element, a depending marking implement mounted -for longitudinal adjustment relative to said support, lan `adjusting screw connected to the marking implement for shifting it relative to Vthe support, a guide element on the support engaging the edge of the disc, and spring means interconnecting the support land the upright member and biased to shift lthe support toward the upright member to retain 'the guide element in engagement with the disc `during turning movements `of the bar about the upright member.

References Cited in the tile of this patent UNITED STATES PATENTS 1,507,535 Wason Sept. 2, 1924 FOREIGN PATENTS 105,735 Switzerland July 1, 1924 603,712 Germany Oct. 6, 1934

Claims

1. AN ELLIPSE GUIDE COMPRISING AN UPRIGHT MEMBER HAVING VERTICAL GUIDE MEANS AND PROVIDED WITH A CENTERING MEANS AT THE LOWER END THEREOF AND A BEARING ABOVE SAID LOWER END, A HORIZONTAL BAR MOUNTED ON SAID BEARING TO ROTATE ABOUT SAID UPRIGHT MEMBER, A SUPPORT MOUNTED ON SAID BAR FOR LONGITUDINAL MOVEMENT THEREON, A DEPENDING MARKING IMPLEMENT MOUNTED FOR LONGITUDINAL ADJUSTMENT ON THE SUPPORT, AN ADJUSTING SCREW ON THE SUPPORT HAVING THREADED CONNECTION WITH THE MARKING IMPLEMENT FOR SHIFTING IT ON THE SUPPORT, A GUIDE DISC, TRANSVERSE PIVOT MEANS FOR THE DISC MOUNTED IN SAID VERTICAL GUIDE MEANS ON THE UPRIGHT MEMBER, MEANS PIVOTALLY CONNECTING ONE EDGE OF THE DISC TO SAID MEMBER, MEANS FOR SHIFTING THE PIVOT MEANS LONGITUDINALLY OF THE UPRIGHT MEMBER TO VARY THE ANGULAR POSITION OF THE DISC ON SAID PIVOT MEANS, A GUIDE MEANS ON THE SUPPORT ENGAGING THE EDGE OF THE DISC, AND SPRING MEANS CONNECTED TO THE SUPPORT RESILIENTLY RETAINING THE GUIDE MEANS IN CONTACT WITH THE EDGE OF THE DISC.