Multifunctional protractor

Abstract

The utility model discloses a multifunctional protractor, which relates to the technical field of protractors, and comprises a semicircular frame, a sliding rod and a ruler plate integrally injection-molded with the semicircular frame, a sliding groove is arranged on the front side of the ruler plate, a sliding positioning block is arranged in the sliding groove, the sliding positioning block is in sliding connection with the inner wall of the sliding groove, and the sliding rod is arranged in the sliding groove. A locking nut is connected to the threaded protrusion of the sliding positioning block in a threaded mode, and a circle drawing through hole is formed in the front face of the sliding positioning block. According to the circle drawing ruler, the sliding positioning block is designed in the sliding groove, the locking nut is connected to the sliding positioning block in a screwed mode, the position, located in the sliding groove, of the sliding positioning block can be limited, and the radius of a circle can be accurately determined when the circle drawing operation is conducted through the cooperation of the positioning mark groove and the third scale marks; furthermore, the phenomenon that the drawn straight line has flaws due to obstruction during straight line drawing operation is avoided, and the practicability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of protractors, in particular to a multifunctional protractor. Background Art

[0002] At present, in order to facilitate students to learn to measure and distinguish angles, protractors are used. In order to improve the functionality of the protractor, reduce the amount of tools that students carry, and achieve the purpose of multiple uses of one device, all-in-one protractors have appeared on the market.

[0003] For example, the authorization announcement number CN220381692U discloses a movable angle demonstrator that can draw circles. The movable angle demonstrator can not only help children learn the concept of angles and understand the knowledge of angles, but also draw the required circles. It integrates several learning functions, reduces the number of learning tools, and alleviates the burden on students. It is deeply loved by teachers and students.

[0004] There are still certain problems when using this demonstrator. For example, when the demonstrator is used to draw a circle, according to the first to fourth embodiments, its fastening device can limit the movable part, but it lacks an indicator mark that can match the scale line on the ruler. When drawing a circle, it is impossible to accurately locate the radius of the circle, resulting in errors in drawing the circle. According to the fifth embodiment, although the fastening device can locate the scale line on the ruler, a part of the pointer of the fastening device protrudes from the ruler. When students draw a straight line, the protruding part will cause obstruction, causing the straight line at this position to form an arc, affecting the students' straight line work, and the pen landing point of the circle drawing hole of the fastening device is at the top of the fastening device, resulting in a deeper pen landing point. After an ordinary pen is inserted, the tip of the pen head cannot penetrate the bottom of the demonstrator and cannot contact the paper. In addition, the position where the semicircular frame of the demonstrator connects to the ruler plate is thin and prone to breakage. Utility Model Content

[0005] The purpose of the present utility model is to provide a multifunctional protractor to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: comprising a semicircular frame, a sliding rod, and a ruler plate integrally injection-molded with the semicircular frame, wherein a sliding groove is provided on the front of the ruler plate, a sliding positioning block is provided inside the sliding groove, the sliding positioning block is slidably connected to the inner wall of the sliding groove, a locking nut is screwed to the threaded protrusion of the sliding positioning block, a circular through hole is provided on the front of the sliding positioning block, and a positioning mark groove is provided on the front of the sliding positioning block and at the bottom of the circular through hole;

[0007] A positioning line is provided on the front side of the ruler plate and at the top of the sliding groove.

[0008] In a further embodiment, a center clamping groove is provided on the front side of the ruler plate and on one side of the sliding groove, and a center positioning bolt is movably clamped inside the center clamping groove.

[0009] Adopting the above technical solution: when the student presses the center positioning bolt, the protractor rotates with the center positioning bolt as the axis to draw a circle.

[0010] In a further embodiment, one end of the sliding rod close to the ruler plate is fixedly sleeved with a rotating shaft rotatably connected to the semicircular frame, and one end of the rotating shaft passes through the other side of the semicircular frame and is clamped with a buckle.

[0011] The above technical solution makes it convenient for the sliding rod to be rotated and fixed with the semicircular frame through the rotating shaft, and convenient for students to adjust the position of the sliding rod on the semicircular frame.

[0012] In a further embodiment, a first scale line and a second scale line are respectively provided on the front side of the semicircular frame, and the other end of the sliding rod is slidably connected to the arc edge of the semicircular frame.

[0013] The above technical solution is adopted: it is convenient to use with the sliding rod, so that students can draw lines according to angle requirements.

[0014] In a further embodiment, a third scale line is provided on the front side of the ruler plate and at the bottom of the sliding groove, and the positioning mark groove is used in conjunction with the third scale line.

[0015] Adopting the above technical solution: it is convenient to provide length marks for the sliding positioning block.

[0016] In a further embodiment, a pointer groove is formed at one end of the sliding rod away from the rotating shaft.

[0017] The above technical solution is adopted to facilitate students to observe the scale of the sliding rod on the semicircular frame more clearly.

[0018] In a further embodiment, the raised point of the center positioning bolt is vertically aligned with the starting scale of the third scale line.

[0019] The above technical solution is adopted to ensure the accuracy of the protractor in drawing a circle.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The utility model is designed with a sliding positioning block inside the sliding groove, and a locking nut is screwed on the sliding positioning block to limit the position of the sliding positioning block inside the sliding groove. The positioning mark groove is used in conjunction with the third scale line to accurately determine the radius of the circle when drawing a circle, and there will be no obstruction when drawing a straight line, which will cause the drawn straight line to be flawed, thereby improving practicality.

[0022] 2. The utility model is provided with a positioning line on the front side of the ruler plate and at the top of the sliding groove. The positioning line can position the inside of the sliding groove. Students can practice calligraphy inside the sliding groove. The positioning line can help students standardize the distance between fonts, improve students' control over the writing distance, and enable students to write more standardized and beautiful fonts. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0024] Figure 2 This is a structural diagram of a center positioning bolt according to an embodiment of the present utility model;

[0025] Figure 3 This is an exploded view of the sliding positioning block and the locking nut according to an embodiment of the present utility model;

[0026] Figure 4 This is a structural diagram of the sliding rod according to an embodiment of the utility model;

[0027] Figure 5 This is a schematic diagram of the connection between the semicircular frame and the ruler plate according to an embodiment of the present utility model;

[0028] Figure 6 It is a bottom view of the structure of an embodiment of the present utility model.

[0029] In the figure: 1. Semicircular frame; 2. Sliding rod; 3. Ruler plate; 4. Sliding groove; 5. Sliding positioning block; 6. Locking nut; 7. Circular through hole; 8. Positioning mark groove; 9. Positioning line; 10. Center slot; 11. Center positioning bolt; 12. Rotating shaft; 13. Buckle; 14. First scale line; 15. Second scale line; 16. Third scale line; 17. Pointer groove. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example 1

[0032] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown, a multifunctional protractor comprises a semicircular frame 1, a sliding rod 2 and a ruler plate 3 integrally injected with the semicircular frame 1, a sliding groove 4 is provided on the front of the ruler plate 3, a sliding positioning block 5 is provided inside the sliding groove 4, the sliding positioning block 5 is slidably connected to the inner wall of the sliding groove 4, a locking nut 6 is screwed on the threaded protrusion of the sliding positioning block 5, a circular through hole 7 is provided on the front of the sliding positioning block 5, a positioning mark groove 8 is provided on the front of the sliding positioning block 5 and at the bottom of the circular through hole 7, by designing the sliding positioning block 5 inside the sliding groove 4, a screw is screwed on the sliding positioning block 5 The locking nut 6 can limit the position of the sliding positioning block 5 inside the sliding groove 4. Through the use of the positioning mark groove 8 and the third scale line 16, the radius of the circle can be accurately determined when drawing a circle, and there will be no obstruction when drawing a straight line, which will cause the drawn straight line to be flawed, thereby improving practicality. The thickness of the sliding positioning block 5 is consistent with that of the ruler plate 3. The circle drawing through hole 7 is designed on the ruler plate 3. After the pen tip is inserted, it can smoothly penetrate the bottom of the protractor and contact the paper. In addition, the position where the semicircular frame 1 connects to the ruler plate 3 is thickened. Figure 1 and Figure 5 As shown, it is not easy to break.

[0033] like Figure 1 、 Figure 2 、 Figure 5 and Figure 6 As shown, a center slot 10 is provided on the front side of the ruler plate 3 and on one side of the sliding slot 4. A center positioning bolt 11 is movably connected to the inner side of the center slot 10. After the center slot 10 and the center positioning bolt 11 are set, when the student needs to draw a circle, the student can press the center positioning bolt 11 so that the center positioning bolt 11 is centered on the raised point. When the student rotates the protractor, the pen tip can be inserted into the circle drawing hole 7 to draw a circle during the rotation process.

[0034] like Figure 4 and Figure 6 As shown, one end of the sliding rod 2 close to the ruler plate 3 is fixedly sleeved with a rotating shaft 12 rotatably connected to the semicircular frame 1, and one end of the rotating shaft 12 passes through the other side of the semicircular frame 1 and is clamped with a buckle 13. After the setting of the rotating shaft 12 and the buckle 13, when the rotating shaft 12 on the sliding rod 2 is inserted into the slot of the semicircular frame 1, the other end is fixed with the buckle 13, so that the sliding rod 2 is rotatably fixed on the semicircular frame 1, so that students can rotate the sliding rod 2 according to their needs and adjust the position of the sliding rod 2 on the semicircular frame 1.

[0035] like Figure 1As shown, the front of the semicircular frame 1 is respectively provided with a first scale line 14 and a second scale line 15, and the other end of the sliding rod 2 is slidably connected to the arc edge of the semicircular frame 1. The setting of the first scale line 14 and the second scale line 15 makes it convenient to use with the sliding rod 2, so that students can move the sliding rod 2 to the position on the semicircular frame 1 according to the required angle, which is convenient for students to draw circles later.

[0036] like Figure 1 As shown, a third scale line 16 is provided on the front side of the ruler plate 3 and at the bottom of the sliding groove 4. The positioning mark groove 8 is used in conjunction with the third scale line 16. After the third scale line 16 is set, when students draw circles or draw straight lines, it is convenient to provide length marks for the sliding positioning block 5 and enable students to draw straight lines according to the required length.

[0037] like Figure 1 As shown, a pointer groove 17 is provided at one end of the sliding rod 2 away from the rotating shaft 12. Through the setting of the pointer groove 17, when the student adjusts the sliding rod 2 to the position on the semicircular frame 1, the student can rotate the sliding rod 2 according to the position on the semicircular frame 1 to move the pointer groove 17 to the corresponding scale, which makes it convenient for the student to rotate the sliding rod 2 to the angle they need.

[0038] like Figure 1 and Figure 6 As shown, the raised point of the center positioning bolt 11 is vertically aligned with the starting scale of the third scale line 16. The setting of the raised point of the center positioning bolt 11 and the starting scale of the third scale line 16 being vertically aligned ensures the accuracy of the protractor in drawing circles.

[0039] Brief description of usage process: When students need to draw angles, they can adjust the position of the sliding rod 2 on the semicircular frame 1 as needed. First, rotate one end of the sliding rod 2 with the rotating shaft 12 as the axis, so that the end of the sliding rod 2 is rotated to the scale specified by the first scale line 14 and the second scale line 15 on the semicircular frame 1. At this time, the included angle between the sliding rod 2 and the semicircular frame is the required angle. After the adjustment is completed, press the protractor to draw and measure angles. When students need to draw straight lines, they can draw straight lines of corresponding lengths according to the scale on the ruler board 3. When they need to draw circles, students can It is necessary to adjust the position of the sliding positioning block 5 according to the radius of the circle, fix it with the locking nut 6, insert the pen tip into the circle drawing hole 7, press the center positioning bolt 11, and rotate the protractor to complete the circle drawing. A sliding positioning block 5 is designed inside the sliding groove 4. A locking nut 6 is screwed on the sliding positioning block 5 to limit the position of the sliding positioning block 5 inside the sliding groove 4. The positioning mark groove 8 is used in conjunction with the third scale line 16 to accurately determine the radius of the circle when drawing a circle, and there will be no obstruction when drawing a straight line, which will cause the drawn straight line to be flawed, thereby improving practicality.

[0040] See also Figure 1 As shown, a positioning line 9 is provided on the front side of the ruler plate 3 and at the top of the sliding groove 4. By designing a positioning line 9 on the front side of the ruler plate 3 and at the top of the sliding groove 4, the positioning line 9 can position the inside of the sliding groove 4. Students can practice writing inside the sliding groove 4. The positioning line 9 can help students standardize the distance between fonts, improve students' control over writing distance, and make students' writing fonts more standardized and beautiful.

[0041] Brief description of the usage process: A positioning line 9 is designed on the front of the ruler plate 3 and at the top of the sliding groove 4. The positioning line 9 can position the inside of the sliding groove 4. Students can practice writing inside the sliding groove 4. The positioning line 9 can help students standardize the distance between fonts and improve students' control of writing distance, so that students can write more standardized and beautiful fonts. Combined with the functions of measuring angles, drawing circles and rulers, a ruler that integrates measuring angles, drawing circles, rulers and writing is formed, which improves functionality.

[0042] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multifunctional protractor, comprising a semicircular frame (1), a sliding rod (2), and a ruler plate (3) integrally injection-molded with the semicircular frame (1), characterized in that: The front face of the ruler plate (3) is provided with a sliding groove (4), the interior of the sliding groove (4) is provided with a sliding positioning block (5), the sliding positioning block (5) is slidably connected to the inner wall of the sliding groove (4), a locking nut (6) is screwed on the threaded protrusion of the sliding positioning block (5), a circular through hole (7) is provided on the front face of the sliding positioning block (5), and a positioning mark groove (8) is provided on the front face of the sliding positioning block (5) and at the bottom of the circular through hole (7); A positioning line (9) is provided on the front side of the ruler plate (3) and at the top of the sliding groove (4).

2. A multifunctional protractor according to claim 1, characterized in that: A center clamping groove (10) is provided on the front side of the ruler plate (3) and located on one side of the sliding groove (4), and a center positioning bolt (11) is movably clamped inside the center clamping groove (10).

3. The multifunctional protractor according to claim 1, characterized in that: One end of the sliding rod (2) close to the ruler plate (3) is fixedly sleeved with a rotating shaft (12) rotatably connected to the semicircular frame (1); one end of the rotating shaft (12) passes through the other side of the semicircular frame (1) and is clamped with a buckle (13).

4. The multifunctional protractor according to claim 1, characterized in that: The front of the semicircular frame (1) is respectively provided with a first scale line (14) and a second scale line (15), and the other end of the sliding rod (2) is slidably connected to the arc edge of the semicircular frame (1).

5. The multifunctional protractor according to claim 2, characterized in that: A third scale line (16) is provided on the front side of the ruler plate (3) and at the bottom of the sliding groove (4), and the positioning mark groove (8) is used in conjunction with the third scale line (16).

6. The multifunctional protractor according to claim 3, characterized in that: A pointer groove (17) is provided at one end of the sliding rod (2) away from the rotating shaft (12).

7. The multifunctional protractor according to claim 5, characterized in that: The raised point of the center positioning bolt (11) is vertically consistent with the starting scale of the third scale line (16).

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