SU11942A1 - A device for dividing a circle into an arbitrary number of equal parts. - Google Patents

Description

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The present invention is an apparatus for dividing a circle into an arbitrary number of equal parts and drawing lines at equal angles consisting of two rotating half-discs near a common center, one of which has a 120 ° slot in the form of a sector of 120 ° to be able to slide into the last thinned part of the other. a half-disk provided with a 60 ° thickened sector with a slit for drawing, moreover, between said half-disks, in addition, there is an independent sector rotating around the same axis 60 °.

In FIG. 1 shows the view of the proposed device from above; FIG. 2 is a bottom view thereof; FIG. 3-section io ABC in FIG. one; FIG. 4 and b are, respectively, cuts in accordance with the GLD and EBL in the same figure. Thus, the proposed device consists of (figs. 1 and 2) rotating on tube 12, firstly, half disk 1, in which there is a groove in the form of a sector of 120 °, secondly, entering into said half disk half part 4 2 and, thirdly, sector 3, located between parts 1 and 2. The thickened part 3 of the half disk 2 cHa6% dHa is through a hole 9, one of the sides 10 of which is located radially. ;

All parts 1, 2 and 3 of the device are equipped with flat rings 11, 11 11, with part 2 having one ring 11 located in the middle, part of ring 11 covering the ring 11 and part 3 or two outer rings 11 spanning from two sides rings 11. All five rings are mounted on a metal tube 12 fixedly attached with their flanges (flanges) to rings 11 of sector 3, while rings And and And freely rotate on it. A transparent plate 13 and a cage are inserted into the tube 12: a 14 with three radial strips, at the point of intersection of which the tip 15 is fixed. On the part 2 there are two buttons 16, and on the part 3 one button 17 ... serving to hold the parts device on the board with the ends of the fingers of his left hand when using the device. On the back side (Fig. 2) of the half-disk 1 and 2. there are partial annular cuts 18 and 19 bordering the hole 9 and being ei; 6 continuation. Part 4 is marked with two radial scales (not shown in the drawing), one of which indicates the number of parts the circle divides into and the other is the distance in degrees between two adjacent radial angle lines.

traced along the edge 10 of the hole 9. To set the angle of the desired number of degrees, the corresponding line of one or another scale must be positioned so that it coincides with the left edge of the half disk I, i.e. with line 1.

Use the device as follows: by setting part 4 of the half disk 2 into the groove of half disk 1, the desired angle or number of those parts into which the circle should be divided and, fixing the screw 7, put the tip 15 of the device in the center of the drawing and position the fingers left hands so that the end of the little finger is in the center in the recess D, the middle and index finger are on the buttons 16, and the thumb is on the button 17, then, rotating sector 3, bring it to the half disk 1 so that the lines 8 and 8 matched, then carried out the radial line along the edge of the 10 holes 9 with a rendezvous or risfedor. Then, pressing the sector 3 to the imp, with your thumb, bring the half-disks 1 and 2 fastened together with a screw 7 to the sector 3 until the lines: 5 b match, then pressing two buttons (index and middle) to the drawing with buttons 16, pushing sector 3 with your thumb until line 8 coincides with line 8.

Now, there is a second radial line, etc., until all the necessary directions from Aini take place at the desired angles or until the entire circumference is divided into the desired number of different parts. The cuts 18 and 19 serve to ensure that the radial lines drawn by the ink are not smeared with the further rotation of the device. .

. A radial scale division indicating the number of parts into which the circle is divided is applied empirically for any desired number of parts.

If the work on the division of circles needs to be done with great precision, the device should be supplied with a radial rezirny cut made.

a transparent plate on which a thin radial scale indicator line is applied, and for the relative movement of the half-disks I and II to apply a micrometer fixture in order to precisely set the desired angle.

Subject pate n. that

1. An apparatus for dividing a circle into an arbitrary number of equal parts and drawing lines at equal angles, characterized by the fact that it consists of 12 parts rotating on a tube: a) a half disk I, in which there is a groove in the form of a sector of 120 °; b ) the part of said groove is made of a refined part 4 of half disk II, the thickened part 3 of which has the form of a sector of 60 ° and is equipped with a through hole 9, one of the sides 10 of which is located radially, and B) of the sector ill, located between parts I and II .

2. In the device described in p. 1, the application for tube 12 in the upper part of the transparent plate 13 and in the lower part of the frame 14 with three radial strips, at the point of intersection of which the tip 15 is strengthened.

3. In the device described in - 1, the use of buttons 17 fixed on parts 1 and 17 buttons on parts two, which serve to hold parts of the device on the board with the ends of fingers when using the device.

4. In the device described in p. 1, the use of semi-distosis i and II, having on the rear side of the partial annular npopesM 18 j to 19, bordering on hole 9 and being its continuation;

5. In the device described in Clause 1, the application on the part .4 of the respective scales, of which one is used to indicate what number the circle is divided into, and the other one is used to indicate the distance in degrees between adjacent radial lines.

6. In the application described in paragraph 1 of the instrument / bore, at precise settings, micrometer adaptation for the relative movement of parts 1 and 11.

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