Regular polygon drawing ruler

Abstract

A regular polygon drawing ruler comprises a lower pointer, an upper pointer, a side length ruler, a threaded cover, a square head bolt, a knurled nut and a center fixing device. Angle scales are marked on the lower pointer, and when the upper pointer rotates to be consistent with the degree of the central angle of the regular polygon needing to be drawn, the threaded cover is rotated to fix the angle of the upper pointer and the lower pointer; the side length ruler is slid, so that the length scales of one side of the side length ruler on the upper pointer and the lower pointer are consistent and correspond to the radius of the circumcircle of the regular polygon needing to be drawn, and the knurled nut is tightened; fixing the aim point mark of the center fixer corresponding to the geometric center of the regular polygon to be drawn, penetrating the threaded hollow cylinder of the lower pointer through the center fixer, and drawing a first side line along the side length ruler; and rotating other parts by taking the center fixer as a circle center until the intersection point of the side length ruler and the lower pointer (upper pointer) coincides with the drawn side line (extension line), starting to draw a second side line, and so on, drawing each side of the regular polygon, and further drawing a complete regular polygon.

Description

Technical Field

[0001] The utility model relates to the field of drawing measurement, in particular to a regular polygon drawing ruler. Background Art

[0002] In traditional construction, when drawing regular polygons, it is often necessary to use multiple tools such as rulers, compasses, protractors, etc. to complete the measurement and calculation in multiple steps, which leads to problems such as cumbersome operations.

[0003] The utility model integrates the functions of a ruler, a protractor and a polygon drawing into one, and can draw regular polygons conveniently and quickly, thereby reducing the number of drawing tools to be carried and making it convenient for draftsmen to carry out their work. Summary of the invention

[0004] The utility model aims to provide a regular polygon drawing ruler to solve the problems of cumbersome operation of drawing regular polygons proposed in the above-mentioned background technology and simplify the drawing steps.

[0005] To achieve the above object, the utility model provides the following technical solutions: a regular polygon drawing ruler, comprising a lower pointer, an upper pointer, a side length ruler, a threaded cover, a square head bolt, a knurled nut, and a center fixer;

[0006] The lower pointer and the upper pointer are connected by a threaded hollow cylinder, which is fastened by a threaded cover. The side length ruler slide groove is placed in the head of the square head bolt. The screw rod of the square head bolt passes through the strip hole of the side length ruler, the lower pointer or the upper pointer. The knurled nut is used to fasten the square head bolt and the side length ruler, the lower pointer and the upper pointer. The lower pointer is marked with an angle scale. When the upper pointer is turned to the degree consistent with the central angle of the regular polygon to be drawn, the threaded cover is rotated to fix the angles of the upper pointer and the lower pointer. The side length ruler, the upper pointer and the lower pointer are all provided with length scales. The side length ruler is slid so that one side of the side length ruler is in The length scales of the upper pointer and the lower pointer are consistent and correspond to the radius of the circumscribed circle of the regular polygon to be drawn, and the knurled nut is tightened; the center mark of the center fixture is fixed corresponding to the geometric center of the regular polygon to be drawn, and the threaded hollow cylinder of the lower pointer is passed through the center fixture, and the first side line is drawn along the side length ruler; the center fixture is rotated as the center of the circle until the intersection of the side length ruler and the lower pointer or the upper pointer coincides with the drawn side line or the extension line of the drawn side line, and the second side line is started to be drawn, and so on, each side of the regular polygon is drawn, and then a complete regular polygon is drawn.

[0007] Preferably, the lower pointer includes: a scale, an angle ruler, a bar hole, a threaded hollow cylinder;

[0008] The lower pointer is preferably P-shaped in shape, and is composed of a long strip scale and a sector-shaped angle scale. The scale is provided with a strip hole, the width of which is slightly larger than the diameter of the square head bolt screw, and length scales are marked on both sides of the strip hole. The lower pointer is provided with a threaded hollow cylinder for fixing the upper pointer and the threaded cover, and the threaded hollow cylinder is an external thread, and the center of the threaded hollow cylinder is at the zero scale position on one side of the length scale of the scale. The angle scale is sector-shaped and forms a whole with the scale, and the center of the angle scale sector is located at the center of the threaded hollow cylinder and coincides with the zero scale of the scale. Angle scales are marked on the outside of the angle scale, and the lower pointer is bent twice so that the upper surface of the scale is flush with the upper surface of the upper pointer scale after complete assembly, and the edge of one side of the lower surface of the lower pointer is chamfered to facilitate drawing the extension line of the side of the regular polygon.

[0009] Preferably, the upper pointer includes a fixed ring, a bar-shaped hole, and a scale;

[0010] The inner diameter of the fixed ring is slightly larger than the outer diameter of the threaded hollow cylinder of the lower pointer. A strip hole is provided on the scale. The width of the strip hole is slightly larger than the diameter of the square head bolt screw. Length scales are marked on both sides of the strip hole. The center of the fixed ring is at the zero scale position on one side of the length scale. The edge of one side of the lower surface of the upper pointer is chamfered to facilitate drawing the extension line of the regular polygon side.

[0011] Preferably, the side length ruler comprises: a scale, a bar hole, and a slide groove;

[0012] A strip hole is provided on the scale, and the width of the strip hole is slightly larger than the diameter of the square head bolt screw. Distance scales are marked on both sides of the strip hole. In order to facilitate measurement, the scale measurement method is a central divergent type, that is, the middle part of the scale is the zero scale, and the two ends of the scale are half of the maximum measurement value of the scale. The slide groove is located below the strip hole and has a rectangular shape. It is used to place the square head bolt head and play a role in limiting the rotation of the square head bolt. One side edge of the upper surface of the side length ruler is chamfered to facilitate drawing the side line of the regular polygon side.

[0013] Preferably, the threaded cover comprises: an upper cover, a through hole, and a thread;

[0014] The upper cover has an inner height higher than the threaded hollow cylinder of the lower pointer and is provided with an inner thread that can be rotated onto the threaded hollow cylinder to press the upper pointer and the lower pointer. The upper cover is provided with a through hole for placing the center fixer.

[0015] The internal size of the upper cover matches the threaded hollow cylinder of the lower pointer, and is provided with an internal thread that matches the threaded hollow cylinder of the lower pointer. The upper cover can be rotated onto the threaded hollow cylinder through the thread, and the upper pointer and the lower pointer are fastened by tightening, thereby fixing the angle between the two pointers. The upper cover is provided with a through hole that is not smaller than the inner diameter of the threaded hollow cylinder of the lower pointer, which is used to place the center fixer.

[0016] Preferably, the thickness of the square head bolt head is not greater than the depth of the side length ruler slide groove, the square head bolt head can slide in the side length ruler slide groove, and the square head bolt screw rod can pass through the upper pointer (lower pointer) strip hole and the side length ruler strip hole.

[0017] Preferably, the central fixer has a cylindrical appearance, an outer diameter that matches the inner diameter of the threaded hollow cylinder, and is made of a transparent rigid material and slotted, including: a suction cup slot, a needle slot, and a magnet slot;

[0018] There is a center mark in the center of the suction cup groove for locating the geometric center of the regular polygon. The suction cup groove can be used to place a straight-head suction cup, or the suction cup can be aligned with the center point of the figure for adsorption, and then the straight head of the suction cup can be inserted into the suction cup groove of the center fixer to play a fixing role; the needle groove can be used to insert a fine needle for fixing on a wooden or other rough surface, and the magnet groove can be used to place a magnet for fixing on the surface of an iron object.

[0019] Preferably, the upper pointer or the lower pointer achieves parallelism through turning.

[0020] Preferably, the upper pointer and the lower pointer are rotatably connected through the threaded hollow cylinder of the lower pointer, and the tightness is adjusted by the threaded cover, the angle between the upper pointer and the lower pointer is determined by the central angle of the drawn regular polygon, the threaded cover is tightened to prevent the upper pointer and the lower pointer from angular deflection, the side length ruler is fixed to the upper pointer and the lower pointer by the square head bolt and the knurled nut, the knurled nut is adjusted to the length scale corresponding to the position of the bar hole of the upper pointer and the lower pointer, the scale of the upper pointer and the lower pointer where the chamfered edge of the side length ruler is located is made equal to the radius of the circumscribed circle of the drawn regular polygon, the knurled nut is tightened to prevent the side length ruler from relative displacement during the drawing process, and the length of a single side of the regular polygon is obtained by adding the scales on both sides of the side length ruler.

[0021] Preferably, during the drawing process, the center fixture is perpendicular to the drawing surface, the center of the center fixture coincides with and is fixed to the geometric center position of the drawn regular polygon, the lower pointer threaded hollow cylinder passes through the center fixture, the position of the first side is determined, the first side is drawn along the side length ruler, and the other components are rotated with the center fixture as the center until the intersection of the side length ruler and the lower pointer (upper pointer) coincides with the first side line (the extension line), and the second side line is started to be drawn, and so on, each side of the regular polygon is drawn, and then a complete regular polygon is drawn.

[0022] Technical effects and advantages of the utility model:

[0023] 1. The utility model can determine the central angle, circumscribed circle radius and single side length of the regular polygon through the cooperation between the upper pointer, the lower pointer and the side length ruler; after fixing the upper pointer and the lower pointer side length ruler, the required regular polygon can be conveniently drawn by rotating the drawing line with the center mark of the center fixer as the center of the circle, and the functions of measuring angles and sides can be realized by disassembling and changing the positions of the square head bolts and the knurled nuts.

[0024] 2. The upper pointer scale portion of the utility model is parallel to the upper surface of the lower pointer scale portion, and the zero scale of the upper pointer and the adjacent side scale of the lower pointer are at the same position, that is, the rotation center of the upper pointer coincides with the center point of the lower pointer angle scale, which facilitates the adjustment of the angles of the upper pointer and the lower pointer. The threaded cover is used to fasten the upper and lower pointers to keep the angles of the upper and lower pointers unchanged during the drawing process.

[0025] 3. The square head bolt of the utility model slides in the slide groove of the side length ruler to adjust the radius of the regular polygon. The side length ruler adopts double-sided scales, and the reference side for drawing lines can be freely selected. The knurled nut is used to tighten the side length ruler, the upper pointer, and the lower pointer to keep them stable during the drawing process.

[0026] 4. The upper pointer, the lower pointer, and the side length ruler of the utility model are all provided with chamfers, which facilitates drawing the extension line of a single side of a regular polygon and conveniently locates the starting point of the next side.

[0027] 5. The utility model can use the lower pointer angle ruler and the upper pointer to directly measure the angle on the plane, and can also use the lower pointer and the side ruler to measure the angle of the wall or the inclined plane of the stairs after removing the square head bolt and the knurled nut fixing the upper pointer. When in use, when the inner edges of the lower pointer and the side ruler are parallel to the two measuring surfaces, tighten the square head bolt and the knurled nut used to fix the lower pointer, and rotate the upper pointer until the edge of the side ruler scale is parallel to the scale line of the upper pointer. At this time, the side ruler is perpendicular to the upper pointer, and the angle "x" between the upper pointer and the lower pointer can be obtained by the reading of the upper pointer on the lower pointer angle ruler, so that the taken angle is "90°-x".

[0028] 6. The utility model can directly measure the length of an object by using the scales on the side length ruler, the upper pointer and the lower pointer, or the upper pointer can be rotated to the 180° position indicated by the lower pointer, and the measurement value can be obtained by adding the readings of the upper pointer (lower pointer). When it is necessary to measure a longer object, the side length ruler and the upper pointer (lower pointer) can be fixed in a straight line by the two square head bolts and the knurled nuts, and the side length ruler can be slid so that the scale of the side length ruler coincides with the scale of the upper pointer (lower pointer), and the measured length can be obtained by adding and subtracting the scale readings of the side length ruler and the scale readings of the upper pointer (lower pointer).

[0029] 7. Each of the scales of the utility model has scale lines on both sides. When sliding the side length ruler, the radius of the circumscribed circle of the drawn regular polygon can be determined by observing the scale corresponding to the edge of the side length ruler on the upper pointer (lower pointer), which is convenient for judging the radius.

[0030] 8. The center fixer of the utility model is made of a transparent material, which facilitates the alignment of the center and the geometric center of the regular polygon.

[0031] 9. When not in use, the utility model can be combined with the upper pointer and the lower pointer, the side ruler can be placed sideways, and the threaded cover and the knurled nut can be tightened to reduce the volume and facilitate carrying. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0033] Figure 2 It is an exploded schematic diagram of the utility model as a whole.

[0034] Figure 3 It is a structural schematic diagram of the lower pointer of the utility model;

[0035] Figure 4 It is a structural schematic diagram of the upper pointer of the utility model;

[0036] Figure 5 It is a structural schematic diagram of the side length ruler of the utility model;

[0037] Figure 6 This is a schematic diagram of the structure of the threaded cover of the utility model;

[0038] Figure 7 It is a structural schematic diagram of the central fixer of the utility model.

[0039] Figure 8 Schematic diagram of three different modes of the central fixer of the utility model.

[0040] Fig. 9 The utility model is a schematic diagram of a method for drawing a regular polygon.

[0041] Fig.10 This is a schematic diagram of the angle taking and measuring ruler structure of the utility model.

[0042] In the figure:

[0043] 1. Down pointer; 2. Up pointer; 3. Threaded cap; 4. Side length ruler; 5. Square head bolt; 6. Knurled nut; 7. Center fixer;

[0044] 11. Angle ruler; 12. Threaded hollow cylinder; 13. Strip hole; 14. Scale; 15. Edge chamfer;

[0045] 21. Fixed ring; 22. Strip hole; 23. Scale; 24. Edge chamfer;

[0046] 31. Upper cover; 32. Through hole; 33. Thread;

[0047] 41. Strip hole; 42. Edge chamfer; 43. Scale; 44. Slide groove;

[0048] 71. Suction cup slot; 72. Needle slot; 73. Magnet slot. Implementation

[0049] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0050] The utility model provides the following Figure 1-10 A regular polygon drawing ruler shown in the figure comprises a lower pointer 1, an upper pointer 2, a side length ruler 4, a threaded cover 3, a square head bolt 5, a knurled nut 6, and a center fixer 7;

[0051] The lower pointer 1 and the upper pointer 2 are connected by a threaded hollow cylinder 12 and fastened by a threaded cover 3. The side length ruler 4 slide groove 44 is placed in the head of the square head bolt 5. The screw rod of the square head bolt 5 passes through the strip holes 41, 13 (22) of the side length ruler 4 and the lower pointer 1 (upper pointer 2). The knurled nut 6 is used to fasten the square head bolt 5 and the side length ruler 4, the lower pointer 1, and the upper pointer 2; the lower pointer 1 is marked with an angle scale. When the upper pointer 2 is turned to the degree consistent with the central angle of the regular polygon to be drawn, the threaded cover 3 is rotated to fix the angle between the upper pointer 2 and the lower pointer 1; the side length ruler 4, the upper pointer 2, and the lower pointer 1 are all provided with length scales, and the sliding Side length ruler 4, make one side of side length ruler 4 consistent with the length scale of upper pointer 2 and lower pointer 1 and correspond to the radius of the circumscribed circle of the regular polygon to be drawn, tighten the knurled nut 6; fix the center fixture 7 so that the center corresponds to the geometric center of the regular polygon to be drawn, pass the threaded hollow cylinder 12 of the lower pointer 1 through the center fixture 7, and draw the first side line along the side length ruler 4; rotate the other parts with the center fixture 7 as the center until the intersection of side length ruler 4 and lower pointer 1 (upper pointer 2) coincides with the drawn side line (the extension line), start drawing the second side line, and so on, draw each side of the regular polygon, and then draw a complete regular polygon.

[0052] As attached Figure 2-4 As shown, the lower pointer includes: a scale 14, an angle ruler 11, a bar hole 13, and a threaded hollow cylinder 12;

[0053] The lower pointer 1 is preferably P-shaped in shape, and is composed of a long strip scale 14 and a sector angle scale 11. The scale 14 is provided with a strip hole 13, the width of which is slightly larger than the diameter of the screw of the square head bolt 5, and length scales are marked on both sides of the strip hole 13. The lower pointer 1 is provided with a threaded hollow cylinder 12 for fixing the upper pointer 2 and the threaded cover 3. The threaded hollow cylinder 12 is an external thread, and the center of the threaded hollow cylinder 12 is on one side of the length scale of the scale 14. The angle ruler 11 is in the shape of a sector and forms a whole with the scale 14. The center of the sector of the angle ruler 11 is located at the center of the threaded hollow cylinder 12 and coincides with the zero scale of the scale 14. Angle scales are marked on the outside of the angle ruler 11. The lower pointer 1 is turned so that the upper surface of the scale 14 is flush with the upper surface of the upper pointer 2 and the scale 23 after complete assembly. One side edge of the lower surface of the lower pointer 1 is chamfered to facilitate drawing the extension line of the side of the regular polygon.

[0054] As attached Figure 4 As shown, the upper pointer includes a fixed ring 21, a bar-shaped hole 22, and a scale 23;

[0055] The inner diameter of the fixed ring 21 is slightly larger than the outer diameter of the threaded hollow cylinder 12 of the lower pointer 1. A strip hole 22 is provided on the scale 23. The width of the strip hole 22 is slightly larger than the diameter of the screw of the square head bolt 5. Length scales are marked on both sides of the strip hole 22. The center of the fixed ring 21 is at the zero scale position on one side of the length scale. The edge of one side of the lower surface of the upper pointer 2 is chamfered 24 to facilitate drawing the extension line of the side of the regular polygon.

[0056] As attached Figure 5 As shown, the side length ruler 4 includes: a scale 43, a strip hole 41, and a slide groove 44;

[0057] A strip hole 41 is provided on the scale 43, and the width of the strip hole 41 is slightly larger than the diameter of the screw of the square head bolt 5. Distance scales are marked on both sides of the strip hole 41. In order to facilitate measurement, the scale measurement method is a central divergent type, that is, the middle part of the scale is the zero scale, and the two ends of the scale are half of the maximum measurement value of the scale. The slide groove 44 is located below the strip hole and has a rectangular shape. It is used to place the head of the square head bolt 5 to limit the rotation of the square head bolt 5. The edge of one side of the upper surface of the side length ruler 4 is chamfered 42 to facilitate drawing the side line of the regular polygon.

[0058] As attached Figure 6 As shown, the threaded cover 3 includes: an upper cover 31, a through hole 32, and a thread 33;

[0059] The internal size of the upper cover 31 matches the threaded hollow cylinder 12 of the lower pointer, and is provided with an internal thread 33 that matches the threaded hollow cylinder 12 of the lower pointer 1. The upper cover 31 can be rotated onto the threaded hollow cylinder 12 through the thread 33, and the upper pointer 2 and the lower pointer 1 are fastened by tightening, thereby fixing the angle between the two pointers. The upper cover 31 is provided with a through hole that is not smaller than the inner diameter of the threaded hollow cylinder 12 of the lower pointer, for placing the center fixer 7.

[0060] As attached Figure 7 As shown, the central fixer 7 is cylindrical in appearance, and its outer diameter matches the inner diameter of the threaded hollow cylinder. It is made of a transparent rigid material and slotted, and includes: a suction cup slot 71, a needle slot 72, and a magnet slot 73;

[0061] There is a center mark at the center of the suction cup groove 71 for locating the geometric center of the regular polygon. The suction cup groove 71 can be used to place a straight-head suction cup, or the suction cup can be aligned with the center point of the figure for adsorption, and then the straight head of the suction cup can be inserted into the suction cup groove 71 of the center fixer 7 to play a fixing role; the needle groove 72 can be used to insert a fine needle for fixing on a wooden or other rough surface, and the magnet groove 73 can be used to place a magnet for fixing on the surface of an iron object.

[0062] As attached Figure 8 As shown, the center fixer is made of transparent material to facilitate the alignment of the center mark with the center point. The three styles of the center fixer are suction cup style a, fine needle style b, and magnet style c.

[0063] When using the regular polygon drawing ruler to draw a regular polygon or measure, the following methods are included:

[0064] 1) First determine the geometric center of the regular polygon to be drawn, select a center fixture 7 of a suitable style, move the center fixture 7 so that the center position of the crosshair mark coincides with the geometric center of the regular polygon to be drawn, then press the center fixture 7 to fix the position, calculate the center angle of the regular polygon, rotate the upper pointer 2 until the side adjacent to the lower pointer 1 is at the angle of the angle ruler 11 of the lower pointer 1 corresponding to the center angle of the regular polygon, tighten the threaded cover 3, then move the chamfered side of the side ruler 4 to the scales 23 and 14 on the upper pointer 2 and lower pointer 1 scales corresponding to the length of the radius of the circumscribed circle of the regular polygon to be drawn, tighten the knurled nut 6, pass through the center fixture 7, and draw the first side line along the chamfered side 42 of the side ruler 4; rotate the other parts with the center fixture 7 as the center until the intersection of the side ruler 4 and the lower pointer 1 (upper pointer 2) coincides with the drawn side line (the extension line), start drawing the second side line, and so on, draw each side of the regular polygon, and then draw a complete regular polygon, such as Fig. 9 As shown;

[0065] 2) The utility model can use the lower pointer angle ruler 11 and the upper pointer 2 to directly measure the angle on the plane, and can also use the lower pointer 1 and the side ruler 4 to measure the angle of the wall or the inclined plane of the stairs after removing the square head bolt 5 and the knurled nut 6 fixing the upper pointer 2. When in use, when the inner edges of the lower pointer 1 and the side ruler 4 are parallel to the two measuring surfaces, tighten the square head bolt 5 and the knurled nut 6 used to fix the lower pointer 1, and rotate the upper pointer 2 until the edge of the side ruler scale 43 is parallel to the scale line of the upper pointer 2. At this time, the side ruler 4 is perpendicular to the upper pointer 2, and the angle "x" between the upper pointer 2 and the lower pointer 1 can be obtained by the reading of the upper pointer 2 on the lower pointer angle ruler 11, so that the taken angle is "90°-x";

[0066] 3) The utility model can directly measure the length of an object by using the scale on the side length ruler 4, the upper pointer 2, and the lower pointer 1, or the upper pointer 2 can be rotated to the 180° position indicated by the lower pointer 1, and the measurement value can be obtained by adding the readings of the upper pointer 2 (lower pointer 1). When it is necessary to measure a longer object, the side length ruler 4 and the upper pointer 2 (lower pointer 1) can be fixed on a straight line by the two square head bolts 5 and the knurled nut 6, and the side length ruler 4 can be slid so that the scale of the side length ruler coincides with the scale of the upper pointer 2 (lower pointer 1), and the measured length can be obtained by adding and subtracting the scale readings of the side length ruler 4 and the scale readings of the upper pointer 2 (lower pointer 1).

[0067] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A regular polygon drawing ruler, comprising a lower pointer, an upper pointer, a side length ruler, a threaded cover, a square head bolt, a knurled nut, and a center fixer; the lower pointer and the upper pointer are connected by a threaded hollow cylinder, which is fastened by the threaded cover, the side length ruler slide slot is placed in the square head bolt head, the screw rod of the square head bolt passes through the strip hole of the side length ruler, the lower pointer or the upper pointer, and the knurled nut is used to fasten the square head bolt and the side length ruler, the lower pointer, and the upper pointer; the lower pointer is marked with an angle scale, and when the upper pointer is turned to the degree consistent with the center angle of the regular polygon to be drawn, the threaded cover is rotated to fix the angles of the upper pointer and the lower pointer; the side length ruler, the upper pointer, and the lower pointer are connected by a threaded hollow cylinder, which is fastened by the threaded cover, the side length ruler, the upper pointer, and the lower pointer are connected by a threaded cover, the screw rod of the square head bolt is placed in the side length ruler slot, the screw rod of the square head bolt passes through the strip hole of the side length ruler, the lower pointer, and the upper pointer, and the knurled nut is used to fasten the square head bolt and the side length ruler, the lower pointer, and the upper pointer; the lower pointer is marked with an angle scale, and when the upper pointer is turned to the degree consistent with the center angle of the regular polygon to be drawn, the threaded cover is rotated to fix the angles of the upper pointer and the lower pointer; The pointers are all equipped with length scales. Slide the side length ruler so that the length scales on one side of the side length ruler at the upper pointer and the lower pointer are consistent and correspond to the radius of the circumscribed circle of the regular polygon to be drawn, and tighten the knurled nut; fix the center mark of the center fixture corresponding to the geometric center of the regular polygon to be drawn, pass the threaded hollow cylinder of the lower pointer through the center fixture, and draw the first side line along the side length ruler; rotate with the center fixture as the center of the circle until the intersection of the side length ruler and the lower pointer or the upper pointer coincides with the drawn side line or the extension line of the drawn side line, and start drawing the second side line, and so on, draw each side of the regular polygon, and then draw a complete regular polygon.

2. A regular polygon drawing ruler according to claim 1, characterized in that: The lower pointer is composed of a long strip scale and a sector-shaped angle scale. The scale is provided with a strip hole, and length scales are marked on both sides of the strip hole. The lower pointer is provided with a threaded hollow cylinder for fixing the upper pointer and the threaded cover. The center of the threaded hollow cylinder coincides with the zero scale position of the length scale of the scale and the center position of the sector of the angle scale. Angle scales are marked on the outside of the angle scale. The upper surface of the lower pointer scale is flush with the upper surface of the upper pointer scale, and one side edge of the lower surface of the lower pointer is chamfered.

3. A regular polygon drawing ruler according to claim 1, characterized in that: The upper pointer includes a fixed circular ring, a bar hole, and a scale; the scale is provided with a bar hole, length scales are marked on both sides of the bar hole, the center of the fixed circular ring coincides with the zero scale position of the length scale, and one edge of the lower surface of the upper pointer is chamfered.

4. A regular polygon drawing ruler according to claim 1, characterized in that: The side length ruler comprises: a scale, a strip hole, and a slide groove; the scale is provided with a strip hole, and distance scales are marked on both sides of the strip hole. The scale measurement method is a center divergent type, that is, the middle part of the scale is the zero scale, the slide groove is located below the strip hole and is rectangular in shape, and one edge of the upper surface of the side length ruler is chamfered.

5. A regular polygon drawing ruler according to claim 1, characterized in that: The threaded cover includes: an upper cover, a through hole, and a thread; the internal height of the upper cover is higher than the threaded hollow cylinder of the lower pointer, and is provided with an internal thread that can be rotated onto the threaded hollow cylinder to press the upper pointer and the lower pointer; the upper cover is provided with a through hole for placing the center fixer.

6. A regular polygon drawing ruler according to claim 1, characterized in that: The center fixer is cylindrical in appearance, made of transparent rigid material and slotted, including: a suction cup slot, a needle slot, and a magnet slot; there is a center mark in the center of the suction cup slot, and the suction cup slot can hold a straight-head suction cup; the needle slot can be inserted with a thin needle, and the magnet slot can be placed with a magnet.

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