A combined multifunctional protractor

Abstract

The present invention relates to a combined multifunctional protractor, comprising a main board with angle scale lines on the circular top surface and / or bottom surface edge, and a sub-board that can be sleeved outside the main board and can rotate relative to the main board; the main board is provided with a positioning hole coaxial with the main board at the center of the circle, and the main board has a first straight plate extending on the side wall, and the first straight plate is provided with a first straight edge extending along the radial direction of the main board and a second straight edge tangent to the main board; the main board is also provided with a plurality of arc-shaped main board notches at equal intervals on the side wall; the sub-board is provided with a semicircular sub-board notch that can match the main board to be embedded, and the sub-board has a second straight plate extending outward on the side wall corresponding to one end of the sub-board notch, and the second straight plate is provided with a third straight edge flush with the end face of the sub-board notch; the sub-board is provided with a sub-board protrusion that can match and engage with the main board notch on the side wall of the sub-board notch. The invention can not only measure angles, but also be used to draw angles of different angle values, which is convenient and practical.

Description

Technical Field

[0001] The invention relates to the field of stationery, in particular to a combined multifunctional protractor. Background Art

[0002] Protractors are stationery that students need to use when learning geometry. Existing protractors are usually semicircular and can only be used to measure angles within 180 degrees. They cannot measure angles exceeding 180 degrees. Moreover, existing protractors only have the function of measuring angles. In practical applications, measuring angles is one aspect, and students also need to draw angles with a certain angle. At this time, existing protractors cannot be used in drawing, which reduces students' learning efficiency. Summary of the invention

[0003] In view of the existing deficiencies, the present invention provides a combined multifunctional protractor.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a combined multifunctional protractor, comprising a main board with angle scale lines on the edges of the circular top surface and / or bottom surface, and a sub-board that can be sleeved outside the main board and can rotate relative to the main board; the main board is provided with a positioning hole coaxial with the main board at the center of the circle, and a first straight plate is extended on the side wall of the main board, and the first straight plate is provided with a first straight edge extending along the radial direction of the main board and a second straight edge tangent to the main board; the main board is also provided with a plurality of arc-shaped main board notches at equal intervals on the side wall; the sub-board is provided with a semicircular sub-board notch that can match the main board to be embedded, and the sub-board is provided with a second straight plate extending outward on the side wall corresponding to one end of the sub-board notch, and the second straight plate is provided with a third straight edge flush with the end face of the sub-board notch; the sub-board is provided with a sub-board protrusion that can match and engage with the main board notch on the side wall of the sub-board notch.

[0005] Preferably, the sub-plate protrusion is arranged in the middle of the side wall of the sub-plate notch.

[0006] Preferably, a plurality of first straight edge notches are arranged at intervals on the first straight edge.

[0007] Preferably, a plurality of third straight edge notches are arranged at intervals on the third straight edge.

[0008] Preferably, the first straight plate is provided with a first straight plate through hole in the shape of an elongated strip parallel to the first straight side, and the second straight plate is provided with a second straight plate through hole in the shape of an elongated strip parallel to the third straight side.

[0009] Preferably, the auxiliary plate is an auxiliary plate of a semicircular fan ring structure.

[0010] Preferably, a plurality of fan-shaped mainboard through holes are evenly spaced around the circumference of the positioning hole on the mainboard, and two adjacent mainboard through holes are spaced apart by spacer bars, and one of the plurality of spacer bars is located in the radial direction of the first straight edge and is arranged adjacent to one side of the first straight plate.

[0011] Preferably, three through holes are provided on the main board.

[0012] Preferably, the angle between two adjacent mainboard notches is 3-10 degrees.

[0013] Preferably, the first straight plate and / or the second straight plate are provided with length scale lines.

[0014] The beneficial effects of the present invention are as follows: the main board of the invention can measure angles within a range of 360 degrees, and the angle value of the required angle can be adjusted by rotating the sub-board relative to the main board, and then the required angle can be drawn by drawing lines along the first straight edge and the third straight edge, and the main board and the sub-board are two separate components, and when drawing is required, the main board is embedded in the sub-board notch of the sub-board, and the two are separated when measuring the angle, so that the sub-board will not affect the measurement of the diagonal of the main board, which is convenient and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure in which a secondary board is sleeved on a main board according to an embodiment of the present invention;

[0016] Figure 2 is a schematic structural diagram of a main board and a first straight board according to an embodiment of the present invention;

[0017] Figure 3 is a schematic diagram of the structure of the auxiliary plate and the second straight plate according to an embodiment of the present invention;

[0018] Names and serial numbers of parts in the figure: 1-main board 10-angle scale line 11-positioning hole 12-main board notch 13-main board through hole 14-spacer 2-sub-board 20-sub-board notch 21-sub-board protrusion 3-first straight board 30-first straight edge 31-second straight edge 32-first straight board through hole 300-first straight edge notch 4-second straight board 40-third straight edge 41-second straight board through hole 400-third straight edge notch 5-length scale line. DETAILED DESCRIPTION

[0019] In order to more clearly illustrate the purpose, technical solutions and advantages of the embodiments of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments for a clear and complete description. Obviously, the embodiments described are partial embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0020] Embodiments of the present invention Figures 1 to 3As shown in the figure, a combined multifunctional protractor comprises a main board 1 with angle scale lines 10 on the edge of the circular top surface and / or bottom surface, and a sub-board 2 which can be mounted outside the main board 1 and can rotate relative to the main board 1. The angle scale lines 10 are angle scale lines from 0 degrees to 360 degrees, which are arranged around the main board 1 in a circumferential direction. The main board 1 can be made of transparent plastic to facilitate the measurement of the angle to be measured. The sub-board 2 is a component separated from the main board 1. When it is necessary to draw an angle, the two are combined and placed on the paper and the sub-board 2 is rotated relative to the main board 1 on the paper to adjust the required angle value. The main board 1 and the sub-board 2 are in the same plane, which is more conducive to drawing angles, and measurement and drawing do not affect each other. The main board 1 is provided with a coaxial center with the main board 1 at the center of the circle. The positioning hole 11 is used to align the vertex of the angle when measuring the angle. The main board 1 has a first straight plate 3 extending from the side wall. The first straight plate 3 and the main board 1 are integrally formed. The angle scale line 10 is arranged on the upper surface and / or the lower surface of the main board 1. The first straight plate 3 is provided with a first straight edge 30 extending radially along the main board 1 and a second straight edge 31 tangent to the main board 1. The first straight plate 3 is in the shape of a long strip, which can be used to draw straight lines. The first straight edge 30 is aligned with the 0 degree angle scale line 10 on the main board 1 and extends in a direction away from the main board 1. The extension line of the first straight edge 30 at one end of the main board 1 will pass through the axis of the positioning hole 11. When measuring the angle, the positioning hole 11 is aligned with the vertex of the angle, and the first straight edge 30 is aligned with one side line of the angle. Just align; the second straight edge 31 can be a straight edge parallel to the first straight edge or inclined to the first straight edge 30 and tangent to the main board 1. At this time, the tangent point of the second straight edge 31 and the main board 1 is the position corresponding to the 270-degree angle scale line 10, which improves the structural firmness of the first straight board 3 on the main board 1; the main board 1 is also provided with a plurality of arc-shaped main board notches 12 at equal intervals on the side wall, and the main board notches 12 are arranged around the circumference of the main board 1; the sub-board 2 is provided with a semicircular sub-board notch 20 that can match the main board 1 embedded, and the diameter of the main board 1 matches the diameter of the sub-board notch 20. The main board 1 is embedded in the sub-board notch 20, and the sub-board 2 is sleeved on the outer wall of the main board 1 and can rotate along the circumference of the main board 1. An angle value of a certain angle is required The rotation of the sub-plate 2 on the main plate 1 is adjusted to achieve this. For example, if the sub-plate 2 is set to a sub-plate with a semicircular fan ring structure, the inner ring of the sub-plate 2 constitutes a sub-plate notch 20, and the outer ring of the sub-plate 2 can be used to draw an arc; at this time, the sub-plate 2 has a second straight plate 4 extending outward on the side wall corresponding to one end of the sub-plate notch 20. The second straight plate 4 is integrally formed with the sub-plate 2, and the second straight plate 4 can also be used to draw a straight line. The second straight plate 4 and the first straight plate 3 are set to the same length, and the second straight plate 4 is provided with a third straight edge 40 flush with the end face of the sub-plate notch 20, that is, the third straight edge 40 and the two end faces of the sub-plate notch 30 are on the same straight line, and the extension line of the third straight edge 40 to the other end on the sub-plate 2 passes through the center point of the sub-plate notch 30;The sub-board 2 is provided with a sub-board protrusion 21 on the side wall of the sub-board notch 20, which can match and engage with the main board notch 12. The rotational position of the sub-board 2 on the main board 1 is positioned by engaging the sub-board protrusion 21 with the main board notch 12. At this time, the straight lines drawn along the first straight edge 30 and the third straight edge 40 are the two sides of the angle of the required angle. When measuring the angle, if it is the angle between two intersecting lines, align the positioning hole 11 with the intersection of the two lines, and then align the first straight edge 30 of the first straight plate 3 with one of the two lines, and the angle scale line 10 aligned with the other line is the angle value of the angle between the two lines. In this case, there is no need to use the sub-plate 2; if the two lines do not intersect directly but the extension line of one of the lines intersects with the other line, then align the positioning hole 11 of the main board 1 and the first straight edge 30 with one of the two lines, and the other line is in a position opposite to the first straight edge 30, and then put the sub-plate 2 on the main board 1 with the third straight edge 40 opposite to the first straight edge 30, and then rotate the sub-plate 2 so that the third straight edge 40 is aligned with the other of the two lines, and the angle scale line 10 aligned with the third straight edge 40 is It is the angle between these two lines; when drawing, put the sub-board 2 on the main board 1, the third straight edge 40 faces the first straight edge 30, according to the required angle value, rotate the sub-board 2 so that the third straight edge 40 is aligned with the corresponding value on the angle scale line 10, and then draw lines along the third straight edge 40 and the first straight edge 30 to form two straight lines of the required angle; for angles less than or equal to 90 degrees, the above method can be used, and for angles greater than 90 degrees, when the sub-board 2 is put on the main board 1, the end face of the sub-board notch 20 opposite to the third straight edge 40 is opposite to the first straight edge 30, that is, the third straight edge 40 is at one end of the sub-board notch 20, and the end face of the other end of the sub-board notch 20 opposite to the first straight edge 30, and then the sub-board 2 is rotated accordingly. ;

[0021] Further improvements, such as Figure 3 As shown in FIG. 1 , the auxiliary plate protrusion 21 is arranged in the middle of the side wall of the auxiliary plate notch 20 , so that the rotation of the auxiliary plate 2 on the main plate 1 can be better positioned.

[0022] Further improvements, such as Figure 2 As shown in , a plurality of first straight edge notches 300 are arranged at intervals on the first straight edge 30, so that points can be drawn at the first straight edge notches 300, and the drawn points are on the same straight line. The first straight edge notches 300 can be arranged as semicircular notches. Figure 3 As shown in , a plurality of third straight edge notches 400 are arranged at intervals on the third straight edge 40. When the first straight edge notch 300 is arranged on the first straight edge 30 and the third straight edge notch 400 is also arranged on the third straight edge 40, the first straight edge notch 300 and the third straight edge notch 400 are arranged at corresponding positions, so that after the secondary board 2 is put on the main board 1, as shown in FIG. Figure 1 As shown in FIG. 1 , when the first straight edge 30 and the third straight edge 40 are in contact with each other, the first straight edge notch 300 and the third straight edge notch 400 form a hole, which is more convenient for use.

[0023] Further improvements, such as Figures 1 to 3 As shown in the figure, the first straight plate 3 is provided with a long strip of first straight plate through hole 32 parallel to the first straight side 30, and the second straight plate 4 is provided with a long strip of second straight plate through hole 41 parallel to the third straight side 40. In this way, after the secondary board 2 is put on the main board 1, when the first straight side 30 and the third straight side 40 are abutted, the first straight plate through hole 32 and the second straight plate through hole 41 are in a parallel state, and the first straight plate through hole 32 and the second straight plate through hole 41 can be used to draw parallel lines; at this time, a plurality of first straight plate through holes 32 can be provided on the first straight plate 3, and the plurality of first straight plate through holes 32 are arranged in a row and column structure. Similarly, a plurality of second straight plate through holes 41 arranged in a row and column structure are also provided on the second straight plate 4, so that two or more parallel lines with different spacings can be drawn.

[0024] Further improvements, such as Figure 1 and Figure 2 As shown in the figure, a plurality of fan-shaped mainboard through holes 13 are arranged at equal intervals around the circumference of the positioning hole 11 on the mainboard 1, and two adjacent mainboard through holes 13 are spaced apart by spacer bars 14. One of the plurality of spacer bars 14 is located in the radial direction of the first straight edge 30 and is arranged adjacent to one side of the first straight plate 3. That is to say, a plurality of mainboard through holes 13 are arranged on the mainboard 1, and the mainboard 1 is hollowed out by the mainboard through holes 13. At this time, the mainboard 1 can be made of stainless steel material, and the angle scale lines 10 are arranged on the upper surface and / or the lower surface of the mainboard 1. When in use, the angle scale lines 10 are arranged on the upper surface and / or the lower surface of the mainboard 1. The side of the degree scale line 10 can be facing the user, and the positioning hole 11 is also set as a through-hole structure to facilitate alignment with the vertex of the angle to be measured. Through the main board through-hole 13, it is easy to see the two straight lines of the angle to be measured under the main board 1; and among the multiple main board through-holes 13, every two adjacent main board through-holes 13 are separated by a spacer bar 14, which means that there are several main board through-holes 13 and there are several spacer bars 14. Among the multiple spacer bars 14, there is a spacer bar 14 located in the radial direction of the first straight edge 30 and is arranged on the main board 1 adjacent to the first straight plate 3. Figure 1 and Figure 2As shown in the figure, the first straight plate 3 is on the right side of the main board 1 corresponding to the 0-degree angle scale line 10. At this time, among the multiple spacers 14, there is a spacer 14 on the right side of the main board 1 corresponding to the 0-degree angle scale line 10. On the spacer 14, multiple spacer through holes along the 0-degree angle scale line 10 can be arranged at intervals to facilitate the alignment of the first straight edge 30 with the positioning hole 11. If the main board through holes 13 are arranged to be three, each main board through hole 13 has a sufficiently large area, and there will not be too many spacers 14, which is convenient for use and can maintain the stability of the structure.

[0025] Further improvements, such as Figure 1 and Figure 2 As shown in , the angle between two adjacent main board notches 12 is 3-10 degrees, so the angle of rotation of the sub-board 2 around the main board 1 can be accurately obtained, thereby knowing the value of the drawn angle, such as setting it to 5 degrees.

[0026] Further improvements, such as Figures 1 to 3 As shown in the figure, length scale lines 5 are provided on the first straight plate 3 and / or the second straight plate 4, that is, length scale lines 5 are provided on the first straight plate 3, or on the second straight plate 4, or on both the first straight plate 3 and the second straight plate 4, so that the first straight plate 3 or the second straight plate 4 can be used as a ruler, and the length scale lines 5 can be set according to international units and / or imperial units.

[0027] Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, these modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A combined multifunctional protractor, characterized in that: It comprises a main board with angle scale lines on the edges of the circular top surface and / or bottom surface, and a sub-board which can be sleeved outside the main board and can rotate relative to the main board; the main board is provided with a positioning hole coaxial with the main board at the center of the circle, and the main board is provided with a first straight plate extending on the side wall, and the first straight plate is provided with a first straight edge extending along the radial direction of the main board and a second straight edge tangent to the main board; the main board is also provided with a plurality of arc-shaped main board notches at equal intervals on the side wall; the sub-board is provided with a semicircular sub-board notch which can match the embedding of the main board, and the sub-board is provided with a second straight plate extending outward on the side wall corresponding to one end of the sub-board notch, and the second straight plate is provided with a third straight edge flush with the end face of the sub-board notch; the sub-board is provided with a sub-board protrusion on the side wall of the sub-board notch which can match and engage with the main board notch.

2. The combined multifunctional protractor according to claim 1, characterized in that: The auxiliary plate protrusion is arranged in the middle of the side wall of the auxiliary plate notch.

3. The combined multifunctional protractor according to claim 1, characterized in that: A plurality of first straight edge notches are arranged at intervals on the first straight edge.

4. The combined multifunctional protractor according to claim 1 or 3, characterized in that: A plurality of third straight edge notches are arranged at intervals on the third straight edge.

5. The combined multifunctional protractor according to claim 1, characterized in that: The first straight plate is provided with a first straight plate through hole in a long strip shape parallel to the first straight side, and the second straight plate is provided with a second straight plate through hole in a long strip shape parallel to the third straight side.

6. The combined multifunctional protractor according to claim 1, characterized in that: The auxiliary plate is an auxiliary plate of a semicircular fan ring structure.

7. The combined multifunctional protractor according to claim 1, characterized in that: A plurality of fan-shaped mainboard through holes are evenly spaced around the circumference of the positioning hole on the mainboard, and two adjacent mainboard through holes are spaced apart by spacer bars. One of the plurality of spacer bars is located in the radial direction of the first straight edge and is arranged adjacent to one side of the first straight plate.

8. The combined multifunctional protractor according to claim 1, characterized in that: The mainboard is provided with three through holes.

9. The combined multifunctional protractor according to claim 1, characterized in that: The angle between two adjacent mainboard notches is 3-10 degrees.

10. The combined multifunctional protractor according to claim 1, characterized in that: The first straight plate and / or the second straight plate are provided with length scale lines.

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