Патент USA US3084451код для вставки
April 9, 1963 3,084,441 K. A. BOWEN INSTRUMENT FOR INSCRIBING AN ELLIPSE Filed April 14, 1961 2 Sheets-Sheet 1 FIG. 2 92 @Y 28 24 I08 7 lllllllllllllll NH 56 @ % T 2s 90 30 I04 I06 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.