A protractor

Abstract

The utility model discloses an angle gauge, including scale part, alignment amplification part and screw, the scale part includes dial, guide pillar, first pin and nut, the alignment amplification part includes magnifying glass, soft cover, spring, second pin, the dial with guide pillar riveting, the nut with guide pillar riveting, the spring is covered and is established on the second pin, the soft cover is covered and is established on the spring, the second pin is inserted and is established on the magnifying glass, the scale part with alignment amplification part is connected through the nut with screw cooperation, the utility model discloses simple structure can measure or draw geometric figure angle, even close to the geometric figure angle of paper edge, simultaneously, the utility model discloses hand -held convenient, can quickly shift and position.

Description

Technical Field

[0001] This utility model relates to the field of plane geometric angle measurement or drawing technology, and in particular to a protractor. Background Technology

[0002] Protractors are frequently used when measuring or drawing angles in plane geometry, and the existing tools of this kind are basically plane protractors.

[0003] While existing protractors are simple in structure and easy to use, their outer diameter is relatively large. This makes it difficult to measure geometric shapes near the edge of the paper, especially when drawing angles. The marked positioning points fall outside the paper, making it inconvenient to draw angles accurately. Furthermore, because the protractor is thin, it is not quick to pick it up, move it, or position it. In addition, existing protractors are semicircular, limiting the options for measurement or drawing positioning. Utility Model Content

[0004] The purpose of this utility model is to address the deficiencies in the above-mentioned technologies by providing a protractor that solves the problems of inconvenience in measuring or drawing geometric figures at the edge of paper due to the large outer diameter of the protractor, the slow displacement and positioning of the planar protractor, and the limited options for measurement or drawing positioning.

[0005] The purpose of this utility model is achieved as follows:

[0006] A protractor includes a scale section, an alignment and magnification section, and a screw. The scale section includes a dial, a guide post, a first pin, and a nut. The alignment and magnification section includes a magnifying glass, a soft sleeve, a spring, and a second pin. The dial and the guide post are riveted together, and the nut and the guide post are riveted together. The spring is sleeved on the second pin, the soft sleeve is sleeved on the spring, and the second pin is inserted into the magnifying glass. The scale section and the alignment and magnification section are connected by the nut and the screw.

[0007] In one possible implementation, the number of the first pins is three, and the three first pins are inserted on the dial and are located on the same horizontal line.

[0008] In one possible implementation, the guide post includes a first cylinder, a second cylinder, and a third cylinder, with three first pins respectively corresponding to the first cylinder, the second cylinder, and the third cylinder, and the three first pins respectively inserted into the corresponding cylinder.

[0009] In one possible implementation, the magnifying glass includes a cylindrical sleeve and a first spherical mirror and a second spherical mirror located on both sides of the cylindrical sleeve, with the cylindrical sleeve fitted onto the second cylinder.

[0010] In one possible implementation, one side of the magnifying glass is connected to the first spherical mirror via a first connecting arm, and the other side of the magnifying glass is connected to the second spherical mirror via a second connecting arm.

[0011] In one possible implementation, the first spherical mirror has a scale line on its central axis, and the second spherical mirror has a scale line on its central axis.

[0012] In one possible implementation, the dial is provided with three mounting holes, and the three first pins are provided in a one-to-one correspondence with the three mounting holes, with the first pins inserted into the mounting holes.

[0013] In one possible implementation, the magnifying glass is provided with a socket, and the second pin is inserted into the socket.

[0014] In one possible implementation, the dial has offset scale lines and degrees.

[0015] In one possible implementation, the nut and the screw are movably connected.

[0016] Compared with the prior art, this utility model has the following advantages:

[0017] 1. Angle Measurement: In this invention, the tip of the middle first pin of the three first pins of the scale section is aligned with the vertex of the angle of the plane geometric figure being measured, and the tips of the other two first pins are aligned with one side of the angle of the plane geometric figure being measured. Then, by rotating the magnifying glass of the alignment magnifying section, the alignment scale line on the magnifying glass is made to coincide with the other side of the angle of the plane geometric figure being measured, thereby reading the degree on the dial corresponding to the scale line on the magnifying glass.

[0018] 2. Drawing the angle: First, use a ruler to draw one side of the angle and mark the vertex. Then, align the tip of the middle first pin of the three first pins on the scale with the vertex of the angle of the plane geometry you are drawing, and align the tips of the other two first pins with the line you are drawing, which is one side of the angle. Next, align the alignment scale line on the magnifying glass with the degree scale line of the angle drawn on the scale by rotating the magnifying glass. Press down the second pin to punch a small hole in the paper. If necessary, you can lightly mark the punched hole with a pencil. Then, draw the other side of the angle through the vertex and the punched point, that is, use two points to determine a straight line. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the protractor structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the scale section of this utility model;

[0021] Figure 3 This is a cross-sectional schematic diagram of the scale section of this utility model;

[0022] Figure 4 This is a top view of the scale section of this utility model;

[0023] Figure 5 This is a schematic diagram of the alignment and enlargement section of this utility model.

[0024] Reference numerals: 10-scale section, 11-scale dial, 12-guide post, 13-nut, 14-first pin, 20-alignment magnification section, 21-magnifying glass, 22-soft sleeve, 23-spring, 24-second pin, 3-screw. Detailed Implementation

[0025] The following description, in conjunction with the accompanying drawings, further illustrates this implementation case:

[0026] Depend on Figures 1-3 As can be seen, a protractor includes a scale section 10, an alignment and magnification section 20, and a screw 3; the scale section 10 includes a scale dial 11, a guide post 12, a first pin 14, and a nut 13; the alignment and magnification section 20 includes a magnifying glass 21, a soft sleeve 22, a spring 23, and a second pin 24; the scale dial 11 and the guide post 12 are riveted together, the nut 13 and the guide post 12 are riveted together, the spring 23 is sleeved on the second pin 24, the soft sleeve 22 is sleeved on the spring 23, the second pin 24 is inserted into the magnifying glass 21, and the scale section 10 and the alignment and magnification section 20 are connected by the nut 13 and the screw 3. It should be noted that the scale on the dial 11 is used to determine the degree of the measured or drawn angle. The three first pins 14 are used to locate the vertex and one side of the angle, aligning with the scale line on the magnifying glass 21 of the magnifying part 20. During measurement, they are used to align with the other side of the measured angle. When drawing the angle, they are used to align with the degree scale line of the angle drawn on the dial 11. Press the second pin 24 to punch a small hole in the paper. If necessary, the small hole can be marked with a pencil. Then, draw the other side of the angle through the vertex and the punched hole, using two points to determine a straight line. If the figure is at the edge of the paper and the punched hole falls outside the paper, the magnifying glass 21 can be rotated 180 degrees before punching the hole. At this time, the punched hole is on the opposite extension line of the other side of the angle. Using the theorem that vertical angles are equal, draw the other side of the angle through the vertex and the punched hole, using two points to determine a straight line.

[0027] This utility model includes a nut 13 and a screw 3. The nut 13 and the screw 3 are connected to connect the scale part 10 and the alignment and magnification part 20 together. Depending on the actual use, two connection states are maintained. In the first state, the screw is not tightened, and the alignment and magnification part 20 can rotate freely around the scale part. In the second state, the screw is tightened, and the alignment and magnification part 20 and the scale part 10 maintain a certain fixed angle. This is used to draw equal angles, corresponding angles, alternate interior angles, or parallel lines (corresponding angles are equal and the two lines are parallel) or parallelograms on the same graphic.

[0028] like Figure 2 As shown, the scale section 10 includes a scale dial 11, guide posts 12, a nut 13, and three first pins 14. The first pins 14 are inserted into three mounting holes on the scale dial 11 that are aligned with the same straight line. The tips of the three first pins 14 represent three points: the middle first pin 14 aligns with the vertex of an angle, and the remaining one or two first pins 14 align with one side of the angle; two points define a straight line. The scale dial 11 has offset silkscreened graduation lines. Because the diameter of the scale dial 11 is small, the offset silkscreening can separate the spacing between adjacent graduation lines, making it easy to identify when the scale dial 11 is aligned with the two graduation lines on the magnifying glass 21.

[0029] like Figure 3 As shown, the alignment and magnification section 20 includes a magnifying glass 21, a soft sleeve 22, a spring 23, and a second pin 24. The magnifying glass 21 has a molded spherical lens on each side and a scale line printed in the middle. The second pin 24 is inserted into a hole on the magnifying glass 21, and then the spring 23 is fitted onto the second pin 24. The spring 23 is then fixed to the second pin 24 by riveting. Finally, the soft sleeve 22 is fitted onto the upper end of the second pin 24. The magnifying glass 21 provides magnification. Because the scale lines on the dial 11 are relatively dense, when the scale lines on the magnifying glass 21 are aligned with the edge of the graphic and the scale lines on the dial 11, the magnification function of the magnifying glass 21 helps to accurately align the position. The second pin 24 is used to punch a small hole in the paper, which is equivalent to marking a point on the paper. Passing through the vertex and the punched hole, there are two points, which can be used to draw the other side of an angle, thus defining a straight line using two points. The soft sleeve 22 makes the fingers more comfortable when pressing the second pin 24 to make a hole, and the spring 23 allows the tip of the second pin 24 to be slightly away from the paper so that it will not scratch the paper when the magnifying glass 21 rotates.

[0030] In summary, the working principle of this utility model is as follows:

[0031] When a user measures the angle of an existing shape, the first pin 14 in the middle of the scale 10 is aligned with the vertex of the angle, and one or two other first pins 14 are aligned with one side of the angle, thus defining a straight line using these two points. The magnifying glass 20 is rotated to align the scale line on the magnifying glass 21 with the other side of the angle, and the degree value represented by the scale line on the dial 11 corresponding to the scale line on the magnifying glass 21 is read. When a user needs to draw an angle, one side is drawn first, and the vertex position of the angle is marked on the straight line. The first pin 14 in the middle of the scale 10 is aligned with the vertex of the angle, and one or two other first pins 14 are aligned with the drawn straight line, which is one side of the angle. Rotate the magnifying part 20 to align the scale line on the magnifying glass 21 with the scale line of the desired degree on the dial 11; press the second pin 24 to punch a small hole in the paper. If necessary, use a pencil to mark it to form a more obvious point. If the punched hole falls outside the paper, rotate the magnifying glass 21 180 degrees and punch a small hole again. Draw the other side of the angle through the vertex and the punched hole, and use the two points to determine a straight line.

[0032] Compared with existing technologies, this utility model has a simple structure, a small outer diameter, 360-degree scale, and 360-degree rotation, making angle measurement and positioning convenient and quick. It can measure or draw geometric angles near the edge of paper. At the same time, this utility model is easy to hold and can be quickly moved and positioned.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A protractor, characterized in that, It includes a scale section, an alignment and magnification section, and a screw; the scale section includes a dial, a guide post, a first pin, and a nut; the alignment and magnification section includes a magnifying glass, a soft sleeve, a spring, and a second pin; the dial and the guide post are riveted together, the nut and the guide post are riveted together, the spring is sleeved on the second pin, the soft sleeve is sleeved on the spring, the second pin is inserted into the magnifying glass, and the scale section and the alignment and magnification section are connected by the nut and the screw.

2. The protractor according to claim 1, characterized in that, The number of the first pins is three, and the three first pins are inserted on the dial and are located on the same horizontal line.

3. The protractor according to claim 2, characterized in that, The guide post includes a first cylinder, a second cylinder, and a third cylinder. The three first pins are respectively configured to correspond one-to-one with the first cylinder, the second cylinder, and the third cylinder, and the three first pins are respectively inserted into the corresponding cylinders.

4. The protractor according to claim 3, characterized in that, The magnifying glass includes a cylindrical sleeve and a first spherical mirror and a second spherical mirror located on both sides of the cylindrical sleeve, with the cylindrical sleeve fitted onto the second cylinder.

5. The protractor according to claim 4, characterized in that, One side of the magnifying glass is connected to the first spherical mirror via a first connecting arm, and the other side of the magnifying glass is connected to the second spherical mirror via a second connecting arm.

6. The protractor according to claim 4, characterized in that, The first spherical mirror has graduation lines on its central axis, and the second spherical mirror has graduation lines on its central axis.

7. The protractor according to claim 1, characterized in that, The dial has three mounting holes, and the three first pins are correspondingly set with the three mounting holes. The first pins are inserted into the mounting holes.

8. The protractor according to claim 1, characterized in that, The magnifying glass is provided with a socket, and the second pin is inserted into the socket.

9. The protractor according to claim 1, characterized in that, The dial has staggered scale lines and degrees.

10. The protractor according to claim 1, characterized in that, The nut and the screw are movably connected.

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