SU20324A1 - Compass for drawing ellipses - Google Patents

Description

In the proposed compass for drawing ellipses, using a screwed rod mounted on the neck of an inclined disc, it is intended to design a circle on the paper, described by a nut screwed onto the rod, moving in a plane inclined to the paper; The nut of the screwed rod moves in the leg that carries the tool that draws the ellipse on the paper.

In FIG. 1 shows a compass view from the front; FIG. 2 is a side view compass in FIG. one; FIG. 3-view compasses from above; FIG. 4 - view of a screwed rod; FIG. 5 is a quad view; FIG. 6 is a view of a disk connected to a quadrant; FIG. 7 is a double-pointed coupling.

Near the stationary vertical leg 1, the pin 2 passed through it can turn the disk 3 fastened to the leg 1 using quadrant 4. The disk 3 is fastened to quadrant 4 by means of screws b, and the quadrant is movably connected to the leg 1 at using screw 5. On the neck of the disk 3, put the end of the screwed rod 8, along the thread of which a spherical nut 9 can move, located inside the second leg 10 of compasses, made in the form of a tube. The rod 8 passes through the slots of the legs 10, somewhat non-reaching to its ends, with, in addition to the aforementioned notches, the legs 10 are provided with still short notches designed to tighten the nut 9 inside the leg. Thus, the nut 9 keeps the leg 10 at a certain distance from the fixed leg 1, on which there are sleeves 17 and 18 rotatable around it, which are interconnected by a handle. The leg 10 carries a pencil 12 at its end and is bonded with two rods 15 and 16 perpendicular to it, the legs 1 freely sliding in the holders 17 and 18 and establishing parallelism between the two legs. Leg 1, ending with needle 19, carries a sleeve: With two points 7, mounted when using a compass along the large and small axis of the ellnps and holding leg 1 in a position perpendicular to the paper. When using a compass, place the disk 3 with a quadrant obliquely, fix it in this position with a screw 5 to hold the knurled head, rotate the device by hand 14 so that the rod 8 takes up the position perpendicular to the leg 1. Then turning the ball-shaped nut 9 a distance between n is selected (5 outlets 10, 1, equal to half of the major axis of the ellipse being drawn. Following that the tip of the needle 19 was at the intersection point of the ellipse axes, and the tips 7 were located on these axes, turn the handle 14 around the legs 1, keeping the latter from rotating by the head. The circumference is described by a nut 9 in a plane inclined to the padded under the device paper, is projected on paper with pencil 12, as a result of which the latter draws an ellipse. when marking.

The subject of the patent.

A compass for drawing ellipses, characterized in that to change the distance of the bearing tool 12 legs 10 from the fixed legs 1

screwed rod 8 is rotated around the latter. At one end, it is worn on the neck of a disk 3 fitted with quadrant 4, by means of which the disk is mounted under the desired incline by means of a screw 5, and the leg 10 is made in the form of a tube, the rod 8 is passed through two longitudinal slits in it, not reaching slightly to its ends, and for mounting the legs 10, according to a predetermined length of the major semi-axis of the ellipse, a spherical nut 9 is used, which is turned through short cuts in the middle part of the tube 10 and slides freely inside the latter, in order to maintain parallelism of the legs 1 and 10, the leg 10 is fastened with two rods 15 and 16 perpendicular to it. The rods 15 and 16 freely slide in the holders 17 and 18 swivel on the leg 1 and connected by a handle for which the leg 10 is rotated, while the fixed leg 1, ending with the needle 19, which is installed in the center of the ellipse being drawn, still carries a coupling with two points 7, which are mounted on the major and minor semi-axes of the ellipse. I, to the patent G. I. I. Gadalina and T.: 20324 I. Gadalina